Add m-esr52 at 52.6.0

60 files changed, 5562 insertions, 0 deletions

diff --git a/modules/libmar/README b/modules/libmar/README
new file mode 100644
index 000000000..422a28959
--- /dev/null
+++ b/modules/libmar/README
@@ -0,0 +1,6 @@
+This directory contains code for a simple archive file format, which
+is documented at http://wiki.mozilla.org/Software_Update:MAR
+
+The src directory builds a small static library used to create, read, and
+extract an archive file.  The tool directory builds a command line utility
+around the library.
diff --git a/modules/libmar/moz.build b/modules/libmar/moz.build
new file mode 100644
index 000000000..01bf543b3
--- /dev/null
+++ b/modules/libmar/moz.build
@@ -0,0 +1,17 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['src']
+
+if CONFIG['MOZ_ENABLE_SIGNMAR']:
+    DIRS += ['sign', 'verify']
+    TEST_DIRS += ['tests']
+elif CONFIG['MOZ_VERIFY_MAR_SIGNATURE']:
+    DIRS += ['verify']
+
+# If we are building ./sign and ./verify then ./tool must come after it
+DIRS += ['tool']
+
diff --git a/modules/libmar/sign/mar_sign.c b/modules/libmar/sign/mar_sign.c
new file mode 100644
index 000000000..84319651d
--- /dev/null
+++ b/modules/libmar/sign/mar_sign.c
@@ -0,0 +1,1163 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifdef XP_WIN
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include "mar_private.h"
+#include "mar_cmdline.h"
+#include "mar.h"
+#include "cryptox.h"
+#ifndef XP_WIN
+#include <unistd.h>
+#endif
+
+#include "nss_secutil.h"
+#include "base64.h"
+
+/**
+ * Initializes the NSS context.
+ * 
+ * @param NSSConfigDir The config dir containing the private key to use
+ * @return 0 on success
+ *         -1 on error
+*/
+int
+NSSInitCryptoContext(const char *NSSConfigDir)
+{
+  SECStatus status = NSS_Initialize(NSSConfigDir, 
+                                    "", "", SECMOD_DB, NSS_INIT_READONLY);
+  if (SECSuccess != status) {
+    fprintf(stderr, "ERROR: Could not initialize NSS\n");
+    return -1;
+  }
+
+  return 0;
+}
+
+/** 
+ * Obtains a signing context.
+ *
+ * @param  ctx A pointer to the signing context to fill
+ * @return 0 on success
+ *         -1 on error
+*/
+int
+NSSSignBegin(const char *certName, 
+             SGNContext **ctx, 
+             SECKEYPrivateKey **privKey, 
+             CERTCertificate **cert,
+             uint32_t *signatureLength) 
+{
+  secuPWData pwdata = { PW_NONE, 0 };
+  if (!certName || !ctx || !privKey || !cert || !signatureLength) {
+    fprintf(stderr, "ERROR: Invalid parameter passed to NSSSignBegin\n");
+    return -1;
+  }
+
+  /* Get the cert and embedded public key out of the database */
+  *cert = PK11_FindCertFromNickname(certName, &pwdata);
+  if (!*cert) {
+    fprintf(stderr, "ERROR: Could not find cert from nickname\n");
+    return -1;
+  }
+
+  /* Get the private key out of the database */
+  *privKey = PK11_FindKeyByAnyCert(*cert, &pwdata);
+  if (!*privKey) {
+    fprintf(stderr, "ERROR: Could not find private key\n");
+    return -1;
+  }
+
+  *signatureLength = PK11_SignatureLen(*privKey);
+
+  if (*signatureLength > BLOCKSIZE) {
+    fprintf(stderr, 
+            "ERROR: Program must be compiled with a larger block size"
+            " to support signing with signatures this large: %u.\n", 
+            *signatureLength);
+    return -1;
+  }
+
+  /* Check that the key length is large enough for our requirements */
+  if (*signatureLength < XP_MIN_SIGNATURE_LEN_IN_BYTES) {
+    fprintf(stderr, "ERROR: Key length must be >= %d bytes\n", 
+            XP_MIN_SIGNATURE_LEN_IN_BYTES);
+    return -1;
+  }
+
+  *ctx = SGN_NewContext (SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, *privKey);
+  if (!*ctx) {
+    fprintf(stderr, "ERROR: Could not create signature context\n");
+    return -1;
+  }
+  
+  if (SGN_Begin(*ctx) != SECSuccess) {
+    fprintf(stderr, "ERROR: Could not begin signature\n");
+    return -1;
+  }
+  
+  return 0;
+}
+
+/**
+ * Writes the passed buffer to the file fp and updates the signature contexts.
+ *
+ * @param  fpDest   The file pointer to write to.
+ * @param  buffer   The buffer to write.
+ * @param  size     The size of the buffer to write.
+ * @param  ctxs     Pointer to the first element in an array of signature
+ *                  contexts to update.
+ * @param  ctxCount The number of signature contexts pointed to by ctxs
+ * @param  err    The name of what is being written to in case of error.
+ * @return  0 on success
+ *         -2 on write error
+ *         -3 on signature update error
+*/
+int
+WriteAndUpdateSignatures(FILE *fpDest, void *buffer,
+                         uint32_t size, SGNContext **ctxs,
+                         uint32_t ctxCount,
+                         const char *err)
+{
+  uint32_t k;
+  if (!size) { 
+    return 0;
+  }
+
+  if (fwrite(buffer, size, 1, fpDest) != 1) {
+    fprintf(stderr, "ERROR: Could not write %s\n", err);
+    return -2;
+  }
+
+  for (k = 0; k < ctxCount; ++k) {
+    if (SGN_Update(ctxs[k], buffer, size) != SECSuccess) {
+      fprintf(stderr, "ERROR: Could not update signature context for %s\n", err);
+      return -3;
+    }
+  }
+  return 0;
+}
+
+/** 
+ * Adjusts each entry's content offset in the the passed in index by the 
+ * specified amount.
+ *
+ * @param indexBuf     A buffer containing the MAR index
+ * @param indexLength  The length of the MAR index
+ * @param offsetAmount The amount to adjust each index entry by
+*/
+void
+AdjustIndexContentOffsets(char *indexBuf, uint32_t indexLength, uint32_t offsetAmount) 
+{
+  uint32_t *offsetToContent;
+  char *indexBufLoc = indexBuf;
+
+  /* Consume the index and adjust each index by the specified amount */
+  while (indexBufLoc != (indexBuf + indexLength)) {
+    /* Adjust the offset */
+    offsetToContent = (uint32_t *)indexBufLoc; 
+    *offsetToContent = ntohl(*offsetToContent);
+    *offsetToContent += offsetAmount;
+    *offsetToContent = htonl(*offsetToContent);
+    /* Skip past the offset, length, and flags */
+    indexBufLoc += 3 * sizeof(uint32_t);
+    indexBufLoc += strlen(indexBufLoc) + 1;
+  }
+}
+
+/**
+ * Reads from fpSrc, writes it to fpDest, and updates the signature contexts.
+ *
+ * @param  fpSrc    The file pointer to read from.
+ * @param  fpDest   The file pointer to write to.
+ * @param  buffer   The buffer to write.
+ * @param  size     The size of the buffer to write.
+ * @param  ctxs     Pointer to the first element in an array of signature
+ *                  contexts to update.
+ * @param  ctxCount The number of signature contexts pointed to by ctxs
+ * @param  err    The name of what is being written to in case of error.
+ * @return  0 on success
+ *         -1 on read error
+ *         -2 on write error
+ *         -3 on signature update error
+*/
+int
+ReadWriteAndUpdateSignatures(FILE *fpSrc, FILE *fpDest, void *buffer,
+                             uint32_t size, SGNContext **ctxs,
+                             uint32_t ctxCount,
+                             const char *err)
+{
+  if (!size) { 
+    return 0;
+  }
+
+  if (fread(buffer, size, 1, fpSrc) != 1) {
+    fprintf(stderr, "ERROR: Could not read %s\n", err);
+    return -1;
+  }
+
+  return WriteAndUpdateSignatures(fpDest, buffer, size, ctxs, ctxCount, err);
+}
+
+
+/**
+ * Reads from fpSrc, writes it to fpDest.
+ *
+ * @param  fpSrc  The file pointer to read from.
+ * @param  fpDest The file pointer to write to.
+ * @param  buffer The buffer to write.
+ * @param  size   The size of the buffer to write.
+ * @param  err    The name of what is being written to in case of error.
+ * @return  0 on success
+ *         -1 on read error
+ *         -2 on write error
+*/
+int
+ReadAndWrite(FILE *fpSrc, FILE *fpDest, void *buffer, 
+             uint32_t size, const char *err) 
+{
+  if (!size) { 
+    return 0;
+  }
+
+  if (fread(buffer, size, 1, fpSrc) != 1) {
+    fprintf(stderr, "ERROR: Could not read %s\n", err);
+    return -1;
+  }
+
+  if (fwrite(buffer, size, 1, fpDest) != 1) {
+    fprintf(stderr, "ERROR: Could not write %s\n", err);
+    return -2;
+  }
+
+  return 0;
+}
+
+/**
+ * Writes out a copy of the MAR at src but with the signature block stripped.
+ *
+ * @param  src  The path of the source MAR file
+ * @param  dest The path of the MAR file to write out that 
+                has no signature block
+ * @return 0 on success
+ *         -1 on error
+*/
+int
+strip_signature_block(const char *src, const char * dest)
+{
+  uint32_t offsetToIndex, dstOffsetToIndex, indexLength, 
+    numSignatures = 0, leftOver;
+  int32_t stripAmount = 0;
+  int64_t oldPos, sizeOfEntireMAR = 0, realSizeOfSrcMAR, numBytesToCopy,
+    numChunks, i;
+  FILE *fpSrc = NULL, *fpDest = NULL;
+  int rv = -1, hasSignatureBlock;
+  char buf[BLOCKSIZE];
+  char *indexBuf = NULL;
+
+  if (!src || !dest) {
+    fprintf(stderr, "ERROR: Invalid parameter passed in.\n");
+    return -1;
+  }
+
+  fpSrc = fopen(src, "rb");
+  if (!fpSrc) {
+    fprintf(stderr, "ERROR: could not open source file: %s\n", src);
+    goto failure;
+  }
+
+  fpDest = fopen(dest, "wb");
+  if (!fpDest) {
+    fprintf(stderr, "ERROR: could not create target file: %s\n", dest);
+    goto failure;
+  }
+
+  /* Determine if the source MAR file has the new fields for signing or not */
+  if (get_mar_file_info(src, &hasSignatureBlock, NULL, NULL, NULL, NULL)) {
+    fprintf(stderr, "ERROR: could not determine if MAR is old or new.\n");
+    goto failure;
+  }
+
+  /* MAR ID */
+  if (ReadAndWrite(fpSrc, fpDest, buf, MAR_ID_SIZE, "MAR ID")) {
+    goto failure;
+  }
+
+  /* Offset to index */
+  if (fread(&offsetToIndex, sizeof(offsetToIndex), 1, fpSrc) != 1) {
+    fprintf(stderr, "ERROR: Could not read offset\n");
+    goto failure;
+  }
+  offsetToIndex = ntohl(offsetToIndex);
+
+  /* Get the real size of the MAR */
+  oldPos = ftello(fpSrc);
+  if (fseeko(fpSrc, 0, SEEK_END)) {
+    fprintf(stderr, "ERROR: Could not seek to end of file.\n");
+    goto failure;
+  }
+  realSizeOfSrcMAR = ftello(fpSrc);
+  if (fseeko(fpSrc, oldPos, SEEK_SET)) {
+    fprintf(stderr, "ERROR: Could not seek back to current location.\n");
+    goto failure;
+  }
+
+  if (hasSignatureBlock) {
+    /* Get the MAR length and adjust its size */
+    if (fread(&sizeOfEntireMAR, 
+              sizeof(sizeOfEntireMAR), 1, fpSrc) != 1) {
+      fprintf(stderr, "ERROR: Could read mar size\n");
+      goto failure;
+    }
+    sizeOfEntireMAR = NETWORK_TO_HOST64(sizeOfEntireMAR);
+    if (sizeOfEntireMAR != realSizeOfSrcMAR) {
+      fprintf(stderr, "ERROR: Source MAR is not of the right size\n");
+      goto failure;
+    }
+  
+    /* Get the num signatures in the source file so we know what to strip */
+    if (fread(&numSignatures, sizeof(numSignatures), 1, fpSrc) != 1) {
+      fprintf(stderr, "ERROR: Could read num signatures\n");
+      goto failure;
+    }
+    numSignatures = ntohl(numSignatures);
+
+    for (i = 0; i < numSignatures; i++) {
+      uint32_t signatureLen;
+
+      /* Skip past the signature algorithm ID */
+      if (fseeko(fpSrc, sizeof(uint32_t), SEEK_CUR)) {
+        fprintf(stderr, "ERROR: Could not skip past signature algorithm ID\n");
+      }
+
+      /* Read in the length of the signature so we know how far to skip */
+      if (fread(&signatureLen, sizeof(uint32_t), 1, fpSrc) != 1) {
+        fprintf(stderr, "ERROR: Could not read signatures length.\n");
+        return CryptoX_Error;
+      }
+      signatureLen = ntohl(signatureLen);
+
+      /* Skip past the signature */
+      if (fseeko(fpSrc, signatureLen, SEEK_CUR)) {
+        fprintf(stderr, "ERROR: Could not skip past signature algorithm ID\n");
+      }
+
+      stripAmount += sizeof(uint32_t) + sizeof(uint32_t) + signatureLen; 
+    }
+
+  } else {
+    sizeOfEntireMAR = realSizeOfSrcMAR;
+    numSignatures = 0;
+  }
+
+  if (((int64_t)offsetToIndex) > sizeOfEntireMAR) {
+    fprintf(stderr, "ERROR: Offset to index is larger than the file size.\n");
+    goto failure;
+  }
+
+  dstOffsetToIndex = offsetToIndex;
+  if (!hasSignatureBlock) {
+    dstOffsetToIndex += sizeof(sizeOfEntireMAR) + sizeof(numSignatures);
+  }
+  dstOffsetToIndex -= stripAmount;
+
+  /* Write out the index offset */
+  dstOffsetToIndex = htonl(dstOffsetToIndex);
+  if (fwrite(&dstOffsetToIndex, sizeof(dstOffsetToIndex), 1, fpDest) != 1) {
+    fprintf(stderr, "ERROR: Could not write offset to index\n");
+    goto failure;
+  }
+  dstOffsetToIndex = ntohl(dstOffsetToIndex);
+
+  /* Write out the new MAR file size */
+  if (!hasSignatureBlock) {
+    sizeOfEntireMAR += sizeof(sizeOfEntireMAR) + sizeof(numSignatures);
+  }
+  sizeOfEntireMAR -= stripAmount;
+
+  /* Write out the MAR size */
+  sizeOfEntireMAR = HOST_TO_NETWORK64(sizeOfEntireMAR);
+  if (fwrite(&sizeOfEntireMAR, sizeof(sizeOfEntireMAR), 1, fpDest) != 1) {
+    fprintf(stderr, "ERROR: Could not write size of MAR\n");
+    goto failure;
+  }
+  sizeOfEntireMAR = NETWORK_TO_HOST64(sizeOfEntireMAR);
+
+  /* Write out the number of signatures, which is 0 */
+  numSignatures = 0;
+  if (fwrite(&numSignatures, sizeof(numSignatures), 1, fpDest) != 1) {
+    fprintf(stderr, "ERROR: Could not write out num signatures\n");
+    goto failure;
+  }
+
+  /* Write out the rest of the MAR excluding the index header and index
+     offsetToIndex unfortunately has to remain 32-bit because for backwards
+     compatibility with the old MAR file format. */
+  if (ftello(fpSrc) > ((int64_t)offsetToIndex)) {
+    fprintf(stderr, "ERROR: Index offset is too small.\n");
+    goto failure;
+  }
+  numBytesToCopy = ((int64_t)offsetToIndex) - ftello(fpSrc);
+  numChunks = numBytesToCopy / BLOCKSIZE;
+  leftOver = numBytesToCopy % BLOCKSIZE;
+
+  /* Read each file and write it to the MAR file */
+  for (i = 0; i < numChunks; ++i) {
+    if (ReadAndWrite(fpSrc, fpDest, buf, BLOCKSIZE, "content block")) {
+      goto failure;
+    }
+  }
+
+  /* Write out the left over */
+  if (ReadAndWrite(fpSrc, fpDest, buf, 
+                   leftOver, "left over content block")) {
+    goto failure;
+  }
+
+  /* Length of the index */
+  if (ReadAndWrite(fpSrc, fpDest, &indexLength, 
+                   sizeof(indexLength), "index length")) {
+    goto failure;
+  }
+  indexLength = ntohl(indexLength);
+
+  /* Consume the index and adjust each index by the difference */
+  indexBuf = malloc(indexLength);
+  if (fread(indexBuf, indexLength, 1, fpSrc) != 1) {
+    fprintf(stderr, "ERROR: Could not read index\n");
+    goto failure;
+  }
+
+  /* Adjust each entry in the index */
+  if (hasSignatureBlock) {
+    AdjustIndexContentOffsets(indexBuf, indexLength, -stripAmount);
+  } else {
+    AdjustIndexContentOffsets(indexBuf, indexLength, 
+                              sizeof(sizeOfEntireMAR) + 
+                              sizeof(numSignatures) - 
+                              stripAmount);
+  }
+
+  if (fwrite(indexBuf, indexLength, 1, fpDest) != 1) {
+    fprintf(stderr, "ERROR: Could not write index\n");
+    goto failure;
+  }
+
+  rv = 0;
+failure: 
+  if (fpSrc) {
+    fclose(fpSrc);
+  }
+
+  if (fpDest) {
+    fclose(fpDest);
+  }
+
+  if (rv) {
+    remove(dest);
+  }
+
+  if (indexBuf) { 
+    free(indexBuf);
+  }
+
+  if (rv) {
+    remove(dest);
+  }
+  return rv;
+}
+
+/**
+ * Extracts a signature from a MAR file, base64 encodes it, and writes it out
+ *
+ * @param  src       The path of the source MAR file
+ * @param  sigIndex  The index of the signature to extract
+ * @param  dest      The path of file to write the signature to
+ * @return 0 on success
+ *         -1 on error
+*/
+int
+extract_signature(const char *src, uint32_t sigIndex, const char * dest)
+{
+  FILE *fpSrc = NULL, *fpDest = NULL;
+  uint32_t i;
+  uint32_t signatureCount;
+  uint32_t signatureLen;
+  uint8_t *extractedSignature = NULL;
+  char *base64Encoded = NULL;
+  int rv = -1;
+  if (!src || !dest) {
+    fprintf(stderr, "ERROR: Invalid parameter passed in.\n");
+    goto failure;
+  }
+
+  fpSrc = fopen(src, "rb");
+  if (!fpSrc) {
+    fprintf(stderr, "ERROR: could not open source file: %s\n", src);
+    goto failure;
+  }
+
+  fpDest = fopen(dest, "wb");
+  if (!fpDest) {
+    fprintf(stderr, "ERROR: could not create target file: %s\n", dest);
+    goto failure;
+  }
+
+  /* Skip to the start of the signature block */
+  if (fseeko(fpSrc, SIGNATURE_BLOCK_OFFSET, SEEK_SET)) {
+    fprintf(stderr, "ERROR: could not seek to signature block\n");
+    goto failure;
+  }
+
+  /* Get the number of signatures */
+  if (fread(&signatureCount, sizeof(signatureCount), 1, fpSrc) != 1) {
+    fprintf(stderr, "ERROR: could not read signature count\n");
+    goto failure;
+  }
+  signatureCount = ntohl(signatureCount);
+  if (sigIndex >= signatureCount) {
+    fprintf(stderr, "ERROR: Signature index was out of range\n");
+    goto failure;
+  }
+
+  /* Skip to the correct signature */
+  for (i = 0; i <= sigIndex; i++) {
+    /* Avoid leaking while skipping signatures */
+    free(extractedSignature);
+
+    /* skip past the signature algorithm ID */
+    if (fseeko(fpSrc, sizeof(uint32_t), SEEK_CUR)) {
+      fprintf(stderr, "ERROR: Could not seek past sig algorithm ID.\n");
+      goto failure;
+    }
+
+    /* Get the signature length */
+    if (fread(&signatureLen, sizeof(signatureLen), 1, fpSrc) != 1) {
+      fprintf(stderr, "ERROR: could not read signature length\n");
+      goto failure;
+    }
+    signatureLen = ntohl(signatureLen);
+
+    /* Get the signature */
+    extractedSignature = malloc(signatureLen);
+    if (fread(extractedSignature, signatureLen, 1, fpSrc) != 1) {
+      fprintf(stderr, "ERROR: could not read signature\n");
+      goto failure;
+    }
+  }
+
+  base64Encoded = BTOA_DataToAscii(extractedSignature, signatureLen);
+  if (!base64Encoded) {
+    fprintf(stderr, "ERROR: could not obtain base64 encoded data\n");
+    goto failure;
+  }
+
+  if (fwrite(base64Encoded, strlen(base64Encoded), 1, fpDest) != 1) {
+    fprintf(stderr, "ERROR: Could not write base64 encoded string\n");
+    goto failure;
+  }
+
+  rv = 0;
+failure:
+  if (base64Encoded) {
+    PORT_Free(base64Encoded);
+  }
+
+  if (extractedSignature) {
+    free(extractedSignature);
+  }
+
+  if (fpSrc) {
+    fclose(fpSrc);
+  }
+
+  if (fpDest) {
+    fclose(fpDest);
+  }
+
+  if (rv) {
+    remove(dest);
+  }
+
+  return rv;
+}
+
+/**
+ * Imports a base64 encoded signature into a MAR file
+ *
+ * @param  src           The path of the source MAR file
+ * @param  sigIndex      The index of the signature to import
+ * @param  base64SigFile A file which contains the signature to import
+ * @param  dest          The path of the destination MAR file with replaced signature
+ * @return 0 on success
+ *         -1 on error
+*/
+int
+import_signature(const char *src, uint32_t sigIndex,
+                 const char *base64SigFile, const char *dest)
+{
+  int rv = -1;
+  FILE *fpSrc = NULL;
+  FILE *fpDest = NULL;
+  FILE *fpSigFile = NULL;
+  uint32_t i;
+  uint32_t signatureCount, signatureLen, signatureAlgorithmID,
+           numChunks, leftOver;
+  char buf[BLOCKSIZE];
+  uint64_t sizeOfSrcMAR, sizeOfBase64EncodedFile;
+  char *passedInSignatureB64 = NULL;
+  uint8_t *passedInSignatureRaw = NULL;
+  uint8_t *extractedMARSignature = NULL;
+  unsigned int passedInSignatureLenRaw;
+
+  if (!src || !dest) {
+    fprintf(stderr, "ERROR: Invalid parameter passed in.\n");
+    goto failure;
+  }
+
+  fpSrc = fopen(src, "rb");
+  if (!fpSrc) {
+    fprintf(stderr, "ERROR: could not open source file: %s\n", src);
+    goto failure;
+  }
+
+  fpDest = fopen(dest, "wb");
+  if (!fpDest) {
+    fprintf(stderr, "ERROR: could not open dest file: %s\n", dest);
+    goto failure;
+  }
+
+  fpSigFile = fopen(base64SigFile , "rb");
+  if (!fpSigFile) {
+    fprintf(stderr, "ERROR: could not open sig file: %s\n", base64SigFile);
+    goto failure;
+  }
+
+  /* Get the src file size */
+  if (fseeko(fpSrc, 0, SEEK_END)) {
+    fprintf(stderr, "ERROR: Could not seek to end of src file.\n");
+    goto failure;
+  }
+  sizeOfSrcMAR = ftello(fpSrc);
+  if (fseeko(fpSrc, 0, SEEK_SET)) {
+    fprintf(stderr, "ERROR: Could not seek to start of src file.\n");
+    goto failure;
+  }
+
+  /* Get the sig file size */
+  if (fseeko(fpSigFile, 0, SEEK_END)) {
+    fprintf(stderr, "ERROR: Could not seek to end of sig file.\n");
+    goto failure;
+  }
+  sizeOfBase64EncodedFile= ftello(fpSigFile);
+  if (fseeko(fpSigFile, 0, SEEK_SET)) {
+    fprintf(stderr, "ERROR: Could not seek to start of sig file.\n");
+    goto failure;
+  }
+
+  /* Read in the base64 encoded signature to import */
+  passedInSignatureB64 = malloc(sizeOfBase64EncodedFile + 1);
+  passedInSignatureB64[sizeOfBase64EncodedFile] = '\0';
+  if (fread(passedInSignatureB64, sizeOfBase64EncodedFile, 1, fpSigFile) != 1) {
+    fprintf(stderr, "ERROR: Could read b64 sig file.\n");
+    goto failure;
+  }
+
+  /* Decode the base64 encoded data */
+  passedInSignatureRaw = ATOB_AsciiToData(passedInSignatureB64, &passedInSignatureLenRaw);
+  if (!passedInSignatureRaw) {
+    fprintf(stderr, "ERROR: could not obtain base64 decoded data\n");
+    goto failure;
+  }
+
+  /* Read everything up until the signature block offset and write it out */
+  if (ReadAndWrite(fpSrc, fpDest, buf,
+                   SIGNATURE_BLOCK_OFFSET, "signature block offset")) {
+    goto failure;
+  }
+
+  /* Get the number of signatures */
+  if (ReadAndWrite(fpSrc, fpDest, &signatureCount,
+                   sizeof(signatureCount), "signature count")) {
+    goto failure;
+  }
+  signatureCount = ntohl(signatureCount);
+  if (signatureCount > MAX_SIGNATURES) {
+    fprintf(stderr, "ERROR: Signature count was out of range\n");
+    goto failure;
+  }
+
+  if (sigIndex >= signatureCount) {
+    fprintf(stderr, "ERROR: Signature index was out of range\n");
+    goto failure;
+  }
+
+  /* Read and write the whole signature block, but if we reach the
+     signature offset, then we should replace it with the specified
+     base64 decoded signature */
+  for (i = 0; i < signatureCount; i++) {
+    /* Read/Write the signature algorithm ID */
+    if (ReadAndWrite(fpSrc, fpDest,
+                     &signatureAlgorithmID,
+                     sizeof(signatureAlgorithmID), "sig algorithm ID")) {
+      goto failure;
+    }
+
+    /* Read/Write the signature length */
+    if (ReadAndWrite(fpSrc, fpDest,
+                     &signatureLen, sizeof(signatureLen), "sig length")) {
+      goto failure;
+    }
+    signatureLen = ntohl(signatureLen);
+
+    /* Get the signature */
+    if (extractedMARSignature) {
+      free(extractedMARSignature);
+    }
+    extractedMARSignature = malloc(signatureLen);
+
+    if (sigIndex == i) {
+      if (passedInSignatureLenRaw != signatureLen) {
+        fprintf(stderr, "ERROR: Signature length must be the same\n");
+        goto failure;
+      }
+
+      if (fread(extractedMARSignature, signatureLen, 1, fpSrc) != 1) {
+        fprintf(stderr, "ERROR: Could not read signature\n");
+        goto failure;
+      }
+
+      if (fwrite(passedInSignatureRaw, passedInSignatureLenRaw,
+                 1, fpDest) != 1) {
+        fprintf(stderr, "ERROR: Could not write signature\n");
+        goto failure;
+      }
+    } else {
+      if (ReadAndWrite(fpSrc, fpDest,
+                       extractedMARSignature, signatureLen, "signature")) {
+        goto failure;
+      }
+    }
+  }
+
+  /* We replaced the signature so let's just skip past the rest o the
+     file. */
+  numChunks = (sizeOfSrcMAR - ftello(fpSrc)) / BLOCKSIZE;
+  leftOver = (sizeOfSrcMAR - ftello(fpSrc)) % BLOCKSIZE;
+
+  /* Read each file and write it to the MAR file */
+  for (i = 0; i < numChunks; ++i) {
+    if (ReadAndWrite(fpSrc, fpDest, buf, BLOCKSIZE, "content block")) {
+      goto failure;
+    }
+  }
+
+  if (ReadAndWrite(fpSrc, fpDest, buf, leftOver, "left over content block")) {
+    goto failure;
+  }
+
+  rv = 0;
+
+failure:
+
+  if (fpSrc) {
+    fclose(fpSrc);
+  }
+
+  if (fpDest) {
+    fclose(fpDest);
+  }
+
+  if (fpSigFile) {
+    fclose(fpSigFile);
+  }
+
+  if (rv) {
+    remove(dest);
+  }
+
+  if (extractedMARSignature) {
+    free(extractedMARSignature);
+  }
+
+  if (passedInSignatureB64) {
+    free(passedInSignatureB64);
+  }
+
+  if (passedInSignatureRaw) {
+    PORT_Free(passedInSignatureRaw);
+  }
+
+  return rv;
+}
+
+/**
+ * Writes out a copy of the MAR at src but with embedded signatures.
+ * The passed in MAR file must not already be signed or an error will 
+ * be returned.
+ *
+ * @param  NSSConfigDir  The NSS directory containing the private key for signing
+ * @param  certNames     The nicknames of the certificate to use for signing
+ * @param  certCount     The number of certificate names contained in certNames.
+ *                       One signature will be produced for each certificate.
+ * @param  src           The path of the source MAR file to sign
+ * @param  dest          The path of the MAR file to write out that is signed
+ * @return 0 on success
+ *         -1 on error
+*/
+int
+mar_repackage_and_sign(const char *NSSConfigDir, 
+                       const char * const *certNames,
+                       uint32_t certCount,
+                       const char *src, 
+                       const char *dest) 
+{
+  uint32_t offsetToIndex, dstOffsetToIndex, indexLength, 
+    numSignatures = 0, leftOver,
+    signatureAlgorithmID, signatureSectionLength = 0;
+  uint32_t signatureLengths[MAX_SIGNATURES];
+  int64_t oldPos, sizeOfEntireMAR = 0, realSizeOfSrcMAR, 
+    signaturePlaceholderOffset, numBytesToCopy, 
+    numChunks, i;
+  FILE *fpSrc = NULL, *fpDest = NULL;
+  int rv = -1, hasSignatureBlock;
+  SGNContext *ctxs[MAX_SIGNATURES];
+  SECItem secItems[MAX_SIGNATURES];
+  char buf[BLOCKSIZE];
+  SECKEYPrivateKey *privKeys[MAX_SIGNATURES];
+  CERTCertificate *certs[MAX_SIGNATURES];
+  char *indexBuf = NULL;
+  uint32_t k;
+
+  memset(signatureLengths, 0, sizeof(signatureLengths));
+  memset(ctxs, 0, sizeof(ctxs));
+  memset(secItems, 0, sizeof(secItems));
+  memset(privKeys, 0, sizeof(privKeys));
+  memset(certs, 0, sizeof(certs));
+
+  if (!NSSConfigDir || !certNames || certCount == 0 || !src || !dest) {
+    fprintf(stderr, "ERROR: Invalid parameter passed in.\n");
+    return -1;
+  }
+
+  if (NSSInitCryptoContext(NSSConfigDir)) {
+    fprintf(stderr, "ERROR: Could not init config dir: %s\n", NSSConfigDir);
+    goto failure;
+  }
+
+  PK11_SetPasswordFunc(SECU_GetModulePassword);
+
+  fpSrc = fopen(src, "rb");
+  if (!fpSrc) {
+    fprintf(stderr, "ERROR: could not open source file: %s\n", src);
+    goto failure;
+  }
+
+  fpDest = fopen(dest, "wb");
+  if (!fpDest) {
+    fprintf(stderr, "ERROR: could not create target file: %s\n", dest);
+    goto failure;
+  }
+
+  /* Determine if the source MAR file has the new fields for signing or not */
+  if (get_mar_file_info(src, &hasSignatureBlock, NULL, NULL, NULL, NULL)) {
+    fprintf(stderr, "ERROR: could not determine if MAR is old or new.\n");
+    goto failure;
+  }
+
+  for (k = 0; k < certCount; k++) {
+    if (NSSSignBegin(certNames[k], &ctxs[k], &privKeys[k],
+                     &certs[k], &signatureLengths[k])) {
+      fprintf(stderr, "ERROR: NSSSignBegin failed\n");
+      goto failure;
+    }
+  }
+
+  /* MAR ID */
+  if (ReadWriteAndUpdateSignatures(fpSrc, fpDest,
+                                   buf, MAR_ID_SIZE,
+                                   ctxs, certCount, "MAR ID")) {
+    goto failure;
+  }
+
+  /* Offset to index */
+  if (fread(&offsetToIndex, sizeof(offsetToIndex), 1, fpSrc) != 1) {
+    fprintf(stderr, "ERROR: Could not read offset\n");
+    goto failure;
+  }
+  offsetToIndex = ntohl(offsetToIndex);
+
+  /* Get the real size of the MAR */
+  oldPos = ftello(fpSrc);
+  if (fseeko(fpSrc, 0, SEEK_END)) {
+    fprintf(stderr, "ERROR: Could not seek to end of file.\n");
+    goto failure;
+  }
+  realSizeOfSrcMAR = ftello(fpSrc);
+  if (fseeko(fpSrc, oldPos, SEEK_SET)) {
+    fprintf(stderr, "ERROR: Could not seek back to current location.\n");
+    goto failure;
+  }
+
+  if (hasSignatureBlock) {
+    /* Get the MAR length and adjust its size */
+    if (fread(&sizeOfEntireMAR, 
+              sizeof(sizeOfEntireMAR), 1, fpSrc) != 1) {
+      fprintf(stderr, "ERROR: Could read mar size\n");
+      goto failure;
+    }
+    sizeOfEntireMAR = NETWORK_TO_HOST64(sizeOfEntireMAR);
+    if (sizeOfEntireMAR != realSizeOfSrcMAR) {
+      fprintf(stderr, "ERROR: Source MAR is not of the right size\n");
+      goto failure;
+    }
+  
+    /* Get the num signatures in the source file */
+    if (fread(&numSignatures, sizeof(numSignatures), 1, fpSrc) != 1) {
+      fprintf(stderr, "ERROR: Could read num signatures\n");
+      goto failure;
+    }
+    numSignatures = ntohl(numSignatures);
+
+    /* We do not support resigning, if you have multiple signatures,
+       you must add them all at the same time. */
+    if (numSignatures) {
+      fprintf(stderr, "ERROR: MAR is already signed\n");
+      goto failure;
+    }
+  } else {
+    sizeOfEntireMAR = realSizeOfSrcMAR;
+  }
+
+  if (((int64_t)offsetToIndex) > sizeOfEntireMAR) {
+    fprintf(stderr, "ERROR: Offset to index is larger than the file size.\n");
+    goto failure;
+  }
+
+  /* Calculate the total signature block length */
+  for (k = 0; k < certCount; k++) {
+    signatureSectionLength += sizeof(signatureAlgorithmID) +
+                              sizeof(signatureLengths[k]) +
+                              signatureLengths[k];
+  }
+  dstOffsetToIndex = offsetToIndex;
+  if (!hasSignatureBlock) {
+    dstOffsetToIndex += sizeof(sizeOfEntireMAR) + sizeof(numSignatures);
+  }
+  dstOffsetToIndex += signatureSectionLength;
+
+  /* Write out the index offset */
+  dstOffsetToIndex = htonl(dstOffsetToIndex);
+  if (WriteAndUpdateSignatures(fpDest, &dstOffsetToIndex,
+                               sizeof(dstOffsetToIndex), ctxs, certCount,
+                               "index offset")) {
+    goto failure;
+  }
+  dstOffsetToIndex = ntohl(dstOffsetToIndex);
+
+  /* Write out the new MAR file size */
+  sizeOfEntireMAR += signatureSectionLength;
+  if (!hasSignatureBlock) {
+    sizeOfEntireMAR += sizeof(sizeOfEntireMAR) + sizeof(numSignatures);
+  }
+
+  /* Write out the MAR size */
+  sizeOfEntireMAR = HOST_TO_NETWORK64(sizeOfEntireMAR);
+  if (WriteAndUpdateSignatures(fpDest, &sizeOfEntireMAR,
+                               sizeof(sizeOfEntireMAR), ctxs, certCount,
+                               "size of MAR")) {
+    goto failure;
+  }
+  sizeOfEntireMAR = NETWORK_TO_HOST64(sizeOfEntireMAR);
+
+  /* Write out the number of signatures */
+  numSignatures = certCount;
+  numSignatures = htonl(numSignatures);
+  if (WriteAndUpdateSignatures(fpDest, &numSignatures,
+                               sizeof(numSignatures), ctxs, certCount,
+                               "num signatures")) {
+    goto failure;
+  }
+  numSignatures = ntohl(numSignatures);
+
+  signaturePlaceholderOffset = ftello(fpDest);
+
+  for (k = 0; k < certCount; k++) {
+    /* Write out the signature algorithm ID, Only an ID of 1 is supported */
+    signatureAlgorithmID = htonl(1);
+    if (WriteAndUpdateSignatures(fpDest, &signatureAlgorithmID,
+                                 sizeof(signatureAlgorithmID),
+                                 ctxs, certCount, "num signatures")) {
+      goto failure;
+    }
+    signatureAlgorithmID = ntohl(signatureAlgorithmID);
+
+    /* Write out the signature length */
+    signatureLengths[k] = htonl(signatureLengths[k]);
+    if (WriteAndUpdateSignatures(fpDest, &signatureLengths[k],
+                                 sizeof(signatureLengths[k]),
+                                 ctxs, certCount, "signature length")) {
+      goto failure;
+    }
+    signatureLengths[k] = ntohl(signatureLengths[k]);
+
+    /* Write out a placeholder for the signature, we'll come back to this later
+      *** THIS IS NOT SIGNED because it is a placeholder that will be replaced
+          below, plus it is going to be the signature itself. *** */
+    memset(buf, 0, sizeof(buf));
+    if (fwrite(buf, signatureLengths[k], 1, fpDest) != 1) {
+      fprintf(stderr, "ERROR: Could not write signature length\n");
+      goto failure;
+    }
+  }
+
+  /* Write out the rest of the MAR excluding the index header and index
+     offsetToIndex unfortunately has to remain 32-bit because for backwards
+     compatibility with the old MAR file format. */
+  if (ftello(fpSrc) > ((int64_t)offsetToIndex)) {
+    fprintf(stderr, "ERROR: Index offset is too small.\n");
+    goto failure;
+  }
+  numBytesToCopy = ((int64_t)offsetToIndex) - ftello(fpSrc);
+  numChunks = numBytesToCopy / BLOCKSIZE;
+  leftOver = numBytesToCopy % BLOCKSIZE;
+
+  /* Read each file and write it to the MAR file */
+  for (i = 0; i < numChunks; ++i) {
+    if (ReadWriteAndUpdateSignatures(fpSrc, fpDest, buf,
+                                     BLOCKSIZE, ctxs, certCount,
+                                     "content block")) {
+      goto failure;
+    }
+  }
+
+  /* Write out the left over */
+  if (ReadWriteAndUpdateSignatures(fpSrc, fpDest, buf,
+                                   leftOver, ctxs, certCount,
+                                   "left over content block")) {
+    goto failure;
+  }
+
+  /* Length of the index */
+  if (ReadWriteAndUpdateSignatures(fpSrc, fpDest, &indexLength,
+                                   sizeof(indexLength), ctxs, certCount,
+                                   "index length")) {
+    goto failure;
+  }
+  indexLength = ntohl(indexLength);
+
+  /* Consume the index and adjust each index by signatureSectionLength */
+  indexBuf = malloc(indexLength);
+  if (fread(indexBuf, indexLength, 1, fpSrc) != 1) {
+    fprintf(stderr, "ERROR: Could not read index\n");
+    goto failure;
+  }
+
+  /* Adjust each entry in the index */
+  if (hasSignatureBlock) {
+    AdjustIndexContentOffsets(indexBuf, indexLength, signatureSectionLength);
+  } else {
+    AdjustIndexContentOffsets(indexBuf, indexLength, 
+                              sizeof(sizeOfEntireMAR) + 
+                              sizeof(numSignatures) + 
+                              signatureSectionLength);
+  }
+
+  if (WriteAndUpdateSignatures(fpDest, indexBuf,
+                               indexLength, ctxs, certCount, "index")) {
+    goto failure;
+  }
+
+  /* Ensure that we don't sign a file that is too large to be accepted by
+     the verification function. */
+  if (ftello(fpDest) > MAX_SIZE_OF_MAR_FILE) {
+    goto failure;
+  }
+
+  for (k = 0; k < certCount; k++) {
+    /* Get the signature */
+    if (SGN_End(ctxs[k], &secItems[k]) != SECSuccess) {
+      fprintf(stderr, "ERROR: Could not end signature context\n");
+      goto failure;
+    }
+    if (signatureLengths[k] != secItems[k].len) {
+      fprintf(stderr, "ERROR: Signature is not the expected length\n");
+      goto failure;
+    }
+  }
+
+  /* Get back to the location of the signature placeholder */
+  if (fseeko(fpDest, signaturePlaceholderOffset, SEEK_SET)) {
+    fprintf(stderr, "ERROR: Could not seek to signature offset\n");
+    goto failure;
+  }
+
+  for (k = 0; k < certCount; k++) {
+    /* Skip to the position of the next signature */
+    if (fseeko(fpDest, sizeof(signatureAlgorithmID) +
+               sizeof(signatureLengths[k]), SEEK_CUR)) {
+      fprintf(stderr, "ERROR: Could not seek to signature offset\n");
+      goto failure;
+    }
+
+    /* Write out the calculated signature.
+      *** THIS IS NOT SIGNED because it is the signature itself. *** */
+    if (fwrite(secItems[k].data, secItems[k].len, 1, fpDest) != 1) {
+      fprintf(stderr, "ERROR: Could not write signature\n");
+      goto failure;
+    }
+  }
+
+  rv = 0;
+failure: 
+  if (fpSrc) {
+    fclose(fpSrc);
+  }
+
+  if (fpDest) {
+    fclose(fpDest);
+  }
+
+  if (rv) {
+    remove(dest);
+  }
+
+  if (indexBuf) { 
+    free(indexBuf);
+  }
+
+  /* Cleanup */
+  for (k = 0; k < certCount; k++) {
+    if (ctxs[k]) {
+      SGN_DestroyContext(ctxs[k], PR_TRUE);
+    }
+
+    if (certs[k]) {
+      CERT_DestroyCertificate(certs[k]);
+    }
+
+    if (privKeys[k]) {
+      SECKEY_DestroyPrivateKey(privKeys[k]);
+    }
+
+    SECITEM_FreeItem(&secItems[k], PR_FALSE);
+  }
+
+  (void)NSS_Shutdown();
+
+  if (rv) {
+    remove(dest);
+  }
+
+  return rv;
+}
diff --git a/modules/libmar/sign/moz.build b/modules/libmar/sign/moz.build
new file mode 100644
index 000000000..e31ff50ab
--- /dev/null
+++ b/modules/libmar/sign/moz.build
@@ -0,0 +1,24 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+Library('signmar')
+
+UNIFIED_SOURCES += [
+    'mar_sign.c',
+    'nss_secutil.c',
+]
+
+FORCE_STATIC_LIB = True
+
+LOCAL_INCLUDES += [
+    '../src',
+    '../verify',
+]
+
+DEFINES['MAR_NSS'] = True
+
+if CONFIG['OS_ARCH'] == 'WINNT':
+    USE_STATIC_LIBS = True
diff --git a/modules/libmar/sign/nss_secutil.c b/modules/libmar/sign/nss_secutil.c
new file mode 100644
index 000000000..b77b33419
--- /dev/null
+++ b/modules/libmar/sign/nss_secutil.c
@@ -0,0 +1,239 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* With the exception of GetPasswordString, this file was
+   copied from NSS's cmd/lib/secutil.c hg revision 8f011395145e */
+
+#include "nss_secutil.h"
+
+#include "prprf.h"
+#ifdef XP_WIN
+#include <io.h>
+#else
+#include <unistd.h>
+#endif
+
+static char consoleName[] =  {
+#ifdef XP_UNIX
+  "/dev/tty"
+#else
+  "CON:"
+#endif
+};
+
+#if defined(_WINDOWS)
+static char * quiet_fgets (char *buf, int length, FILE *input)
+{
+  int c;
+  char *end = buf;
+
+  /* fflush (input); */
+  memset (buf, 0, length);
+
+  if (!isatty(fileno(input))) {
+    return fgets(buf,length,input);
+  }
+
+  while (1)
+  {
+#if defined (_WIN32_WCE)
+    c = getchar();	/* gets a character from stdin */
+#else
+    c = getch();	/* getch gets a character from the console */
+#endif
+    if (c == '\b')
+    {
+      if (end > buf)
+        end--;
+    }
+
+    else if (--length > 0)
+      *end++ = c;
+
+    if (!c || c == '\n' || c == '\r')
+      break;
+  }
+
+  return buf;
+}
+#endif
+
+char *
+GetPasswordString(void *arg, char *prompt)
+{
+  FILE *input = stdin;
+  char phrase[200] = {'\0'};
+  int isInputTerminal = isatty(fileno(stdin));
+
+#ifndef _WINDOWS
+  if (isInputTerminal) {
+    input = fopen(consoleName, "r");
+    if (input == NULL) {
+      fprintf(stderr, "Error opening input terminal for read\n");
+      return NULL;
+    }
+  }
+#endif 
+
+  if (isInputTerminal) {
+    fprintf(stdout, "Please enter your password:\n");
+    fflush(stdout);
+  }
+
+  if (!QUIET_FGETS(phrase, sizeof(phrase), input)) {
+    fprintf(stderr, "QUIET_FGETS failed\n");
+    return NULL;
+  }
+
+  if (isInputTerminal) {
+    fprintf(stdout, "\n");
+  }
+
+#ifndef _WINDOWS
+  if (isInputTerminal) {
+    fclose(input);
+  }
+#endif
+
+  /* Strip off the newlines if present */
+  if (phrase[PORT_Strlen(phrase)-1] == '\n' || 
+      phrase[PORT_Strlen(phrase)-1] == '\r') {
+    phrase[PORT_Strlen(phrase)-1] = 0;
+  }
+  return (char*) PORT_Strdup(phrase);
+}
+
+char *
+SECU_FilePasswd(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+  char* phrases, *phrase;
+  PRFileDesc *fd;
+  int32_t nb;
+  char *pwFile = arg;
+  int i;
+  const long maxPwdFileSize = 4096;
+  char* tokenName = NULL;
+  int tokenLen = 0;
+
+  if (!pwFile)
+    return 0;
+
+  if (retry) {
+    return 0;  /* no good retrying - the files contents will be the same */
+  }
+
+  phrases = PORT_ZAlloc(maxPwdFileSize);
+
+  if (!phrases) {
+    return 0; /* out of memory */
+  }
+
+  fd = PR_Open(pwFile, PR_RDONLY, 0);
+  if (!fd) {
+    fprintf(stderr, "No password file \"%s\" exists.\n", pwFile);
+    PORT_Free(phrases);
+    return NULL;
+  }
+
+  nb = PR_Read(fd, phrases, maxPwdFileSize);
+
+  PR_Close(fd);
+
+  if (nb == 0) {
+    fprintf(stderr,"password file contains no data\n");
+    PORT_Free(phrases);
+    return NULL;
+  }
+
+  if (slot) {
+    tokenName = PK11_GetTokenName(slot);
+    if (tokenName) {
+      tokenLen = PORT_Strlen(tokenName);
+    }
+  }
+  i = 0;
+  do
+  {
+    int startphrase = i;
+    int phraseLen;
+
+    /* handle the Windows EOL case */
+    while (phrases[i] != '\r' && phrases[i] != '\n' && i < nb) i++;
+    /* terminate passphrase */
+    phrases[i++] = '\0';
+    /* clean up any EOL before the start of the next passphrase */
+    while ( (i<nb) && (phrases[i] == '\r' || phrases[i] == '\n')) {
+      phrases[i++] = '\0';
+    }
+    /* now analyze the current passphrase */
+    phrase = &phrases[startphrase];
+    if (!tokenName)
+      break;
+    if (PORT_Strncmp(phrase, tokenName, tokenLen)) continue;
+    phraseLen = PORT_Strlen(phrase);
+    if (phraseLen < (tokenLen+1)) continue;
+    if (phrase[tokenLen] != ':') continue;
+    phrase = &phrase[tokenLen+1];
+    break;
+
+  } while (i<nb);
+
+  phrase = PORT_Strdup((char*)phrase);
+  PORT_Free(phrases);
+  return phrase;
+}
+
+char *
+SECU_GetModulePassword(PK11SlotInfo *slot, PRBool retry, void *arg) 
+{
+    char prompt[255];
+    secuPWData *pwdata = (secuPWData *)arg;
+    secuPWData pwnull = { PW_NONE, 0 };
+    secuPWData pwxtrn = { PW_EXTERNAL, "external" };
+    char *pw;
+
+    if (pwdata == NULL)
+  pwdata = &pwnull;
+
+    if (PK11_ProtectedAuthenticationPath(slot)) {
+  pwdata = &pwxtrn;
+    }
+    if (retry && pwdata->source != PW_NONE) {
+  PR_fprintf(PR_STDERR, "Incorrect password/PIN entered.\n");
+      return NULL;
+    }
+
+    switch (pwdata->source) {
+    case PW_NONE:
+  sprintf(prompt, "Enter Password or Pin for \"%s\":",
+                   PK11_GetTokenName(slot));
+  return GetPasswordString(NULL, prompt);
+    case PW_FROMFILE:
+  /* Instead of opening and closing the file every time, get the pw
+   * once, then keep it in memory (duh).
+   */
+  pw = SECU_FilePasswd(slot, retry, pwdata->data);
+  pwdata->source = PW_PLAINTEXT;
+  pwdata->data = PL_strdup(pw);
+  /* it's already been dup'ed */
+  return pw;
+    case PW_EXTERNAL:
+  sprintf(prompt, 
+          "Press Enter, then enter PIN for \"%s\" on external device.\n",
+    PK11_GetTokenName(slot));
+  pw = GetPasswordString(NULL, prompt);
+  if (pw) {
+    memset(pw, 0, PORT_Strlen(pw));
+    PORT_Free(pw);
+  }
+      /* Fall Through */
+    case PW_PLAINTEXT:
+  return PL_strdup(pwdata->data);
+    default:
+  break;
+    }
+
+    PR_fprintf(PR_STDERR, "Password check failed:  No password found.\n");
+    return NULL;
+}
diff --git a/modules/libmar/sign/nss_secutil.h b/modules/libmar/sign/nss_secutil.h
new file mode 100644
index 000000000..363c64918
--- /dev/null
+++ b/modules/libmar/sign/nss_secutil.h
@@ -0,0 +1,41 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* With the exception of GetPasswordString, this file was
+   copied from NSS's cmd/lib/secutil.h hg revision 8f011395145e */
+
+#ifndef NSS_SECUTIL_H_
+#define NSS_SECUTIL_H_
+
+#include "nss.h"
+#include "pk11pub.h"
+#include "cryptohi.h"
+#include "hasht.h"
+#include "cert.h"
+#include "key.h"
+#include <stdint.h>
+
+typedef struct {
+  enum {
+    PW_NONE = 0,
+    PW_FROMFILE = 1,
+    PW_PLAINTEXT = 2,
+    PW_EXTERNAL = 3
+  } source;
+  char *data;
+} secuPWData;
+
+#if( defined(_WINDOWS) && !defined(_WIN32_WCE))
+#include <conio.h>
+#include <io.h>
+#define QUIET_FGETS quiet_fgets
+static char * quiet_fgets (char *buf, int length, FILE *input);
+#else
+#define QUIET_FGETS fgets
+#endif
+
+char *
+SECU_GetModulePassword(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+#endif
diff --git a/modules/libmar/src/mar.h b/modules/libmar/src/mar.h
new file mode 100644
index 000000000..98b454d94
--- /dev/null
+++ b/modules/libmar/src/mar.h
@@ -0,0 +1,198 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MAR_H__
+#define MAR_H__
+
+#include "mozilla/Assertions.h"
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* We have a MAX_SIGNATURES limit so that an invalid MAR will never
+ * waste too much of either updater's or signmar's time.
+ * It is also used at various places internally and will affect memory usage.
+ * If you want to increase this value above 9 then you need to adjust parsing
+ * code in tool/mar.c.
+*/
+#define MAX_SIGNATURES 8
+#ifdef __cplusplus
+static_assert(MAX_SIGNATURES <= 9, "too many signatures");
+#else
+MOZ_STATIC_ASSERT(MAX_SIGNATURES <= 9, "too many signatures");
+#endif
+
+struct ProductInformationBlock {
+  const char *MARChannelID;
+  const char *productVersion;
+};
+
+/**
+ * The MAR item data structure.
+ */
+typedef struct MarItem_ {
+  struct MarItem_ *next;  /* private field */
+  uint32_t offset;        /* offset into archive */
+  uint32_t length;        /* length of data in bytes */
+  uint32_t flags;         /* contains file mode bits */
+  char name[1];           /* file path */
+} MarItem;
+
+#define TABLESIZE 256
+
+struct MarFile_ {
+  FILE *fp;
+  MarItem *item_table[TABLESIZE];
+};
+
+typedef struct MarFile_ MarFile;
+
+/**
+ * Signature of callback function passed to mar_enum_items.
+ * @param mar       The MAR file being visited.
+ * @param item      The MAR item being visited.
+ * @param data      The data parameter passed by the caller of mar_enum_items.
+ * @return          A non-zero value to stop enumerating.
+ */
+typedef int (* MarItemCallback)(MarFile *mar, const MarItem *item, void *data);
+
+/**
+ * Open a MAR file for reading.
+ * @param path      Specifies the path to the MAR file to open.  This path must
+ *                  be compatible with fopen.
+ * @return          NULL if an error occurs.
+ */
+MarFile *mar_open(const char *path);
+
+#ifdef XP_WIN
+MarFile *mar_wopen(const wchar_t *path);
+#endif
+
+/**
+ * Close a MAR file that was opened using mar_open.
+ * @param mar       The MarFile object to close.
+ */
+void mar_close(MarFile *mar);
+
+/**
+ * Find an item in the MAR file by name.
+ * @param mar       The MarFile object to query.
+ * @param item      The name of the item to query.
+ * @return          A const reference to a MAR item or NULL if not found.
+ */
+const MarItem *mar_find_item(MarFile *mar, const char *item);
+
+/**
+ * Enumerate all MAR items via callback function.
+ * @param mar       The MAR file to enumerate.
+ * @param callback  The function to call for each MAR item.
+ * @param data      A caller specified value that is passed along to the
+ *                  callback function.
+ * @return          0 if the enumeration ran to completion.  Otherwise, any
+ *                  non-zero return value from the callback is returned.
+ */
+int mar_enum_items(MarFile *mar, MarItemCallback callback, void *data);
+
+/**
+ * Read from MAR item at given offset up to bufsize bytes.
+ * @param mar       The MAR file to read.
+ * @param item      The MAR item to read.
+ * @param offset    The byte offset relative to the start of the item.
+ * @param buf       A pointer to a buffer to copy the data into.
+ * @param bufsize   The length of the buffer to copy the data into.
+ * @return          The number of bytes written or a negative value if an
+ *                  error occurs.
+ */
+int mar_read(MarFile *mar, const MarItem *item, int offset, char *buf,
+             int bufsize);
+
+/**
+ * Create a MAR file from a set of files.
+ * @param dest      The path to the file to create.  This path must be
+ *                  compatible with fopen.
+ * @param numfiles  The number of files to store in the archive.
+ * @param files     The list of null-terminated file paths.  Each file
+ *                  path must be compatible with fopen.
+ * @param infoBlock The information to store in the product information block.
+ * @return          A non-zero value if an error occurs.
+ */
+int mar_create(const char *dest, 
+               int numfiles, 
+               char **files, 
+               struct ProductInformationBlock *infoBlock);
+
+/**
+ * Extract a MAR file to the current working directory.
+ * @param path      The path to the MAR file to extract.  This path must be
+ *                  compatible with fopen.
+ * @return          A non-zero value if an error occurs.
+ */
+int mar_extract(const char *path);
+
+#define MAR_MAX_CERT_SIZE (16*1024) // Way larger than necessary
+
+/* Read the entire file (not a MAR file) into a newly-allocated buffer.
+ * This function does not write to stderr. Instead, the caller should
+ * write whatever error messages it sees fit. The caller must free the returned
+ * buffer using free().
+ *
+ * @param filePath The path to the file that should be read.
+ * @param maxSize  The maximum valid file size.
+ * @param data     On success, *data will point to a newly-allocated buffer
+ *                 with the file's contents in it.
+ * @param size     On success, *size will be the size of the created buffer.
+ * 
+ * @return 0 on success, -1 on error
+ */
+int mar_read_entire_file(const char * filePath,
+                         uint32_t maxSize,
+                         /*out*/ const uint8_t * *data,
+                         /*out*/ uint32_t *size);
+
+/**
+ * Verifies a MAR file by verifying each signature with the corresponding
+ * certificate. That is, the first signature will be verified using the first
+ * certificate given, the second signature will be verified using the second
+ * certificate given, etc. The signature count must exactly match the number of
+ * certificates given, and all signature verifications must succeed.
+ * We do not check that the certificate was issued by any trusted authority. 
+ * We assume it to be self-signed.  We do not check whether the certificate 
+ * is valid for this usage.
+ * 
+ * @param mar            The already opened MAR file.
+ * @param certData       Pointer to the first element in an array of certificate
+ *                       file data.
+ * @param certDataSizes  Pointer to the first element in an array for size of
+ *                       the cert data.
+ * @param certCount      The number of elements in certData and certDataSizes
+ * @return 0 on success
+ *         a negative number if there was an error
+ *         a positive number if the signature does not verify
+ */
+int mar_verify_signatures(MarFile *mar,
+                          const uint8_t * const *certData,
+                          const uint32_t *certDataSizes,
+                          uint32_t certCount);
+
+/** 
+ * Reads the product info block from the MAR file's additional block section.
+ * The caller is responsible for freeing the fields in infoBlock
+ * if the return is successful.
+ *
+ * @param infoBlock Out parameter for where to store the result to
+ * @return 0 on success, -1 on failure
+*/
+int
+mar_read_product_info_block(MarFile *mar, 
+                            struct ProductInformationBlock *infoBlock);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* MAR_H__ */
diff --git a/modules/libmar/src/mar_cmdline.h b/modules/libmar/src/mar_cmdline.h
new file mode 100644
index 000000000..e2c9ed5fe
--- /dev/null
+++ b/modules/libmar/src/mar_cmdline.h
@@ -0,0 +1,110 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MAR_CMDLINE_H__
+#define MAR_CMDLINE_H__
+
+/* We use NSPR here just to import the definition of uint32_t */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct ProductInformationBlock;
+
+/**
+ * Determines MAR file information.
+ *
+ * @param path                   The path of the MAR file to check.
+ * @param hasSignatureBlock      Optional out parameter specifying if the MAR
+ *                               file has a signature block or not.
+ * @param numSignatures          Optional out parameter for storing the number
+ *                               of signatures in the MAR file.
+ * @param hasAdditionalBlocks    Optional out parameter specifying if the MAR
+ *                               file has additional blocks or not.
+ * @param offsetAdditionalBlocks Optional out parameter for the offset to the 
+ *                               first additional block. Value is only valid if
+ *                               hasAdditionalBlocks is not equal to 0.
+ * @param numAdditionalBlocks    Optional out parameter for the number of
+ *                               additional blocks.  Value is only valid if
+ *                               has_additional_blocks is not equal to 0.
+ * @return 0 on success and non-zero on failure.
+ */
+int get_mar_file_info(const char *path, 
+                      int *hasSignatureBlock,
+                      uint32_t *numSignatures,
+                      int *hasAdditionalBlocks,
+                      uint32_t *offsetAdditionalBlocks,
+                      uint32_t *numAdditionalBlocks);
+
+/** 
+ * Reads the product info block from the MAR file's additional block section.
+ * The caller is responsible for freeing the fields in infoBlock
+ * if the return is successful.
+ *
+ * @param infoBlock Out parameter for where to store the result to
+ * @return 0 on success, -1 on failure
+*/
+int
+read_product_info_block(char *path, 
+                        struct ProductInformationBlock *infoBlock);
+
+/** 
+ * Refreshes the product information block with the new information.
+ * The input MAR must not be signed or the function call will fail.
+ * 
+ * @param path             The path to the MAR file whose product info block
+ *                         should be refreshed.
+ * @param infoBlock        Out parameter for where to store the result to
+ * @return 0 on success, -1 on failure
+*/
+int
+refresh_product_info_block(const char *path,
+                           struct ProductInformationBlock *infoBlock);
+
+/**
+ * Writes out a copy of the MAR at src but with the signature block stripped.
+ *
+ * @param  src  The path of the source MAR file
+ * @param  dest The path of the MAR file to write out that 
+                has no signature block
+ * @return 0 on success
+ *         -1 on error
+*/
+int
+strip_signature_block(const char *src, const char * dest);
+
+/**
+ * Extracts a signature from a MAR file, base64 encodes it, and writes it out
+ *
+ * @param  src       The path of the source MAR file
+ * @param  sigIndex  The index of the signature to extract
+ * @param  dest      The path of file to write the signature to
+ * @return 0 on success
+ *         -1 on error
+*/
+int
+extract_signature(const char *src, uint32_t sigIndex, const char * dest);
+
+/**
+ * Imports a base64 encoded signature into a MAR file
+ *
+ * @param  src           The path of the source MAR file
+ * @param  sigIndex      The index of the signature to import
+ * @param  base64SigFile A file which contains the signature to import
+ * @param  dest          The path of the destination MAR file with replaced signature
+ * @return 0 on success
+ *         -1 on error
+*/
+int
+import_signature(const char *src,
+                 uint32_t sigIndex,
+                 const char * base64SigFile,
+                 const char *dest);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* MAR_CMDLINE_H__ */
diff --git a/modules/libmar/src/mar_create.c b/modules/libmar/src/mar_create.c
new file mode 100644
index 000000000..5171901c0
--- /dev/null
+++ b/modules/libmar/src/mar_create.c
@@ -0,0 +1,399 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include "mar_private.h"
+#include "mar_cmdline.h"
+#include "mar.h"
+
+#ifdef XP_WIN
+#include <winsock2.h>
+#else
+#include <netinet/in.h>
+#include <unistd.h>
+#endif
+
+struct MarItemStack {
+  void *head;
+  uint32_t size_used;
+  uint32_t size_allocated;
+  uint32_t last_offset;
+};
+
+/**
+ * Push a new item onto the stack of items.  The stack is a single block
+ * of memory.
+ */
+static int mar_push(struct MarItemStack *stack, uint32_t length, uint32_t flags,
+                    const char *name) {
+  int namelen;
+  uint32_t n_offset, n_length, n_flags;
+  uint32_t size;
+  char *data;
+  
+  namelen = strlen(name);
+  size = MAR_ITEM_SIZE(namelen);
+
+  if (stack->size_allocated - stack->size_used < size) {
+    /* increase size of stack */
+    size_t size_needed = ROUND_UP(stack->size_used + size, BLOCKSIZE);
+    stack->head = realloc(stack->head, size_needed);
+    if (!stack->head)
+      return -1;
+    stack->size_allocated = size_needed;
+  }
+
+  data = (((char *) stack->head) + stack->size_used);
+
+  n_offset = htonl(stack->last_offset);
+  n_length = htonl(length);
+  n_flags = htonl(flags);
+
+  memcpy(data, &n_offset, sizeof(n_offset));
+  data += sizeof(n_offset);
+
+  memcpy(data, &n_length, sizeof(n_length));
+  data += sizeof(n_length);
+
+  memcpy(data, &n_flags, sizeof(n_flags));
+  data += sizeof(n_flags);
+
+  memcpy(data, name, namelen + 1);
+  
+  stack->size_used += size;
+  stack->last_offset += length;
+  return 0;
+}
+
+static int mar_concat_file(FILE *fp, const char *path) {
+  FILE *in;
+  char buf[BLOCKSIZE];
+  size_t len;
+  int rv = 0;
+
+  in = fopen(path, "rb");
+  if (!in) {
+    fprintf(stderr, "ERROR: could not open file in mar_concat_file()\n");
+    perror(path);
+    return -1;
+  }
+
+  while ((len = fread(buf, 1, BLOCKSIZE, in)) > 0) {
+    if (fwrite(buf, len, 1, fp) != 1) {
+      rv = -1;
+      break;
+    }
+  }
+
+  fclose(in);
+  return rv;
+}
+
+/**
+ * Writes out the product information block to the specified file.
+ *
+ * @param fp           The opened MAR file being created.
+ * @param stack        A pointer to the MAR item stack being used to create 
+ *                     the MAR
+ * @param infoBlock    The product info block to store in the file.
+ * @return 0 on success.
+*/
+static int
+mar_concat_product_info_block(FILE *fp, 
+                              struct MarItemStack *stack,
+                              struct ProductInformationBlock *infoBlock)
+{
+  char buf[PIB_MAX_MAR_CHANNEL_ID_SIZE + PIB_MAX_PRODUCT_VERSION_SIZE];
+  uint32_t additionalBlockID = 1, infoBlockSize, unused;
+  if (!fp || !infoBlock || 
+      !infoBlock->MARChannelID ||
+      !infoBlock->productVersion) {
+    return -1;
+  }
+ 
+  /* The MAR channel name must be < 64 bytes per the spec */
+  if (strlen(infoBlock->MARChannelID) > PIB_MAX_MAR_CHANNEL_ID_SIZE) {
+    return -1;
+  }
+
+  /* The product version must be < 32 bytes per the spec */
+  if (strlen(infoBlock->productVersion) > PIB_MAX_PRODUCT_VERSION_SIZE) {
+    return -1;
+  }
+
+  /* Although we don't need the product information block size to include the
+     maximum MAR channel name and product version, we allocate the maximum
+     amount to make it easier to modify the MAR file for repurposing MAR files
+     to different MAR channels. + 2 is for the NULL terminators. */
+  infoBlockSize = sizeof(infoBlockSize) +
+                  sizeof(additionalBlockID) +
+                  PIB_MAX_MAR_CHANNEL_ID_SIZE +
+                  PIB_MAX_PRODUCT_VERSION_SIZE + 2;
+  if (stack) {
+    stack->last_offset += infoBlockSize;
+  }
+
+  /* Write out the product info block size */
+  infoBlockSize = htonl(infoBlockSize);
+  if (fwrite(&infoBlockSize, 
+      sizeof(infoBlockSize), 1, fp) != 1) {
+    return -1;
+  }
+  infoBlockSize = ntohl(infoBlockSize);
+
+  /* Write out the product info block ID */
+  additionalBlockID = htonl(additionalBlockID);
+  if (fwrite(&additionalBlockID, 
+      sizeof(additionalBlockID), 1, fp) != 1) {
+    return -1;
+  }
+  additionalBlockID = ntohl(additionalBlockID);
+
+  /* Write out the channel name and NULL terminator */
+  if (fwrite(infoBlock->MARChannelID, 
+      strlen(infoBlock->MARChannelID) + 1, 1, fp) != 1) {
+    return -1;
+  }
+
+  /* Write out the product version string and NULL terminator */
+  if (fwrite(infoBlock->productVersion, 
+      strlen(infoBlock->productVersion) + 1, 1, fp) != 1) {
+    return -1;
+  }
+
+  /* Write out the rest of the block that is unused */
+  unused = infoBlockSize - (sizeof(infoBlockSize) +
+                            sizeof(additionalBlockID) +
+                            strlen(infoBlock->MARChannelID) + 
+                            strlen(infoBlock->productVersion) + 2);
+  memset(buf, 0, sizeof(buf));
+  if (fwrite(buf, unused, 1, fp) != 1) {
+    return -1;
+  }
+  return 0;
+}
+
+/** 
+ * Refreshes the product information block with the new information.
+ * The input MAR must not be signed or the function call will fail.
+ * 
+ * @param path             The path to the MAR file whose product info block
+ *                         should be refreshed.
+ * @param infoBlock        Out parameter for where to store the result to
+ * @return 0 on success, -1 on failure
+*/
+int
+refresh_product_info_block(const char *path,
+                           struct ProductInformationBlock *infoBlock)
+{
+  FILE *fp ;
+  int rv;
+  uint32_t numSignatures, additionalBlockSize, additionalBlockID,
+    offsetAdditionalBlocks, numAdditionalBlocks, i;
+  int additionalBlocks, hasSignatureBlock;
+  int64_t oldPos;
+
+  rv = get_mar_file_info(path, 
+                         &hasSignatureBlock,
+                         &numSignatures,
+                         &additionalBlocks,
+                         &offsetAdditionalBlocks,
+                         &numAdditionalBlocks);
+  if (rv) {
+    fprintf(stderr, "ERROR: Could not obtain MAR information.\n");
+    return -1;
+  }
+
+  if (hasSignatureBlock && numSignatures) {
+    fprintf(stderr, "ERROR: Cannot refresh a signed MAR\n");
+    return -1;
+  }
+
+  fp = fopen(path, "r+b");
+  if (!fp) {
+    fprintf(stderr, "ERROR: could not open target file: %s\n", path);
+    return -1;
+  }
+
+  if (fseeko(fp, offsetAdditionalBlocks, SEEK_SET)) {
+    fprintf(stderr, "ERROR: could not seek to additional blocks\n");
+    fclose(fp);
+    return -1;
+  }
+
+  for (i = 0; i < numAdditionalBlocks; ++i) {
+    /* Get the position of the start of this block */
+    oldPos = ftello(fp);
+
+    /* Read the additional block size */
+    if (fread(&additionalBlockSize, 
+              sizeof(additionalBlockSize), 
+              1, fp) != 1) {
+      fclose(fp);
+      return -1;
+    }
+    additionalBlockSize = ntohl(additionalBlockSize);
+
+    /* Read the additional block ID */
+    if (fread(&additionalBlockID, 
+              sizeof(additionalBlockID), 
+              1, fp) != 1) {
+      fclose(fp);
+      return -1;
+    }
+    additionalBlockID = ntohl(additionalBlockID);
+
+    if (PRODUCT_INFO_BLOCK_ID == additionalBlockID) {
+      if (fseeko(fp, oldPos, SEEK_SET)) {
+        fprintf(stderr, "Could not seek back to Product Information Block\n");
+        fclose(fp);
+        return -1;
+      }
+
+      if (mar_concat_product_info_block(fp, NULL, infoBlock)) {
+        fprintf(stderr, "Could not concat Product Information Block\n");
+        fclose(fp);
+        return -1;
+      }
+
+      fclose(fp);
+      return 0;
+    } else {
+      /* This is not the additional block you're looking for. Move along. */
+      if (fseek(fp, additionalBlockSize, SEEK_CUR)) {
+        fprintf(stderr, "ERROR: Could not seek past current block.\n");
+        fclose(fp);
+        return -1;
+      }
+    }
+  }
+
+  /* If we had a product info block we would have already returned */
+  fclose(fp);
+  fprintf(stderr, "ERROR: Could not refresh because block does not exist\n");
+  return -1;
+}
+
+/**
+ * Create a MAR file from a set of files.
+ * @param dest      The path to the file to create.  This path must be
+ *                  compatible with fopen.
+ * @param numfiles  The number of files to store in the archive.
+ * @param files     The list of null-terminated file paths.  Each file
+ *                  path must be compatible with fopen.
+ * @param infoBlock The information to store in the product information block.
+ * @return A non-zero value if an error occurs.
+ */
+int mar_create(const char *dest, int 
+               num_files, char **files, 
+               struct ProductInformationBlock *infoBlock) {
+  struct MarItemStack stack;
+  uint32_t offset_to_index = 0, size_of_index, 
+    numSignatures, numAdditionalSections;
+  uint64_t sizeOfEntireMAR = 0;
+  struct stat st;
+  FILE *fp;
+  int i, rv = -1;
+
+  memset(&stack, 0, sizeof(stack));
+
+  fp = fopen(dest, "wb");
+  if (!fp) {
+    fprintf(stderr, "ERROR: could not create target file: %s\n", dest);
+    return -1;
+  }
+
+  if (fwrite(MAR_ID, MAR_ID_SIZE, 1, fp) != 1)
+    goto failure;
+  if (fwrite(&offset_to_index, sizeof(uint32_t), 1, fp) != 1)
+    goto failure;
+
+  stack.last_offset = MAR_ID_SIZE + 
+                      sizeof(offset_to_index) +
+                      sizeof(numSignatures) + 
+                      sizeof(numAdditionalSections) +
+                      sizeof(sizeOfEntireMAR);
+
+  /* We will circle back on this at the end of the MAR creation to fill it */
+  if (fwrite(&sizeOfEntireMAR, sizeof(sizeOfEntireMAR), 1, fp) != 1) {
+    goto failure;
+  }
+
+  /* Write out the number of signatures, for now only at most 1 is supported */
+  numSignatures = 0;
+  if (fwrite(&numSignatures, sizeof(numSignatures), 1, fp) != 1) {
+    goto failure;
+  }
+
+  /* Write out the number of additional sections, for now just 1 
+     for the product info block */
+  numAdditionalSections = htonl(1);
+  if (fwrite(&numAdditionalSections, 
+             sizeof(numAdditionalSections), 1, fp) != 1) {
+    goto failure;
+  }
+  numAdditionalSections = ntohl(numAdditionalSections);
+
+  if (mar_concat_product_info_block(fp, &stack, infoBlock)) {
+    goto failure;
+  }
+
+  for (i = 0; i < num_files; ++i) {
+    if (stat(files[i], &st)) {
+      fprintf(stderr, "ERROR: file not found: %s\n", files[i]);
+      goto failure;
+    }
+
+    if (mar_push(&stack, st.st_size, st.st_mode & 0777, files[i]))
+      goto failure;
+
+    /* concatenate input file to archive */
+    if (mar_concat_file(fp, files[i]))
+      goto failure;
+  }
+
+  /* write out the index (prefixed with length of index) */
+  size_of_index = htonl(stack.size_used);
+  if (fwrite(&size_of_index, sizeof(size_of_index), 1, fp) != 1)
+    goto failure;
+  if (fwrite(stack.head, stack.size_used, 1, fp) != 1)
+    goto failure;
+
+  /* To protect against invalid MAR files, we assumes that the MAR file 
+     size is less than or equal to MAX_SIZE_OF_MAR_FILE. */
+  if (ftell(fp) > MAX_SIZE_OF_MAR_FILE) {
+    goto failure;
+  }
+
+  /* write out offset to index file in network byte order */
+  offset_to_index = htonl(stack.last_offset);
+  if (fseek(fp, MAR_ID_SIZE, SEEK_SET))
+    goto failure;
+  if (fwrite(&offset_to_index, sizeof(offset_to_index), 1, fp) != 1)
+    goto failure;
+  offset_to_index = ntohl(stack.last_offset);
+  
+  sizeOfEntireMAR = ((uint64_t)stack.last_offset) +
+                    stack.size_used +
+                    sizeof(size_of_index);
+  sizeOfEntireMAR = HOST_TO_NETWORK64(sizeOfEntireMAR);
+  if (fwrite(&sizeOfEntireMAR, sizeof(sizeOfEntireMAR), 1, fp) != 1)
+    goto failure;
+  sizeOfEntireMAR = NETWORK_TO_HOST64(sizeOfEntireMAR);
+
+  rv = 0;
+failure: 
+  if (stack.head)
+    free(stack.head);
+  fclose(fp);
+  if (rv)
+    remove(dest);
+  return rv;
+}
diff --git a/modules/libmar/src/mar_extract.c b/modules/libmar/src/mar_extract.c
new file mode 100644
index 000000000..ec1cd6c53
--- /dev/null
+++ b/modules/libmar/src/mar_extract.c
@@ -0,0 +1,83 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include "mar_private.h"
+#include "mar.h"
+
+#ifdef XP_WIN
+#include <io.h>
+#include <direct.h>
+#endif
+
+/* Ensure that the directory containing this file exists */
+static int mar_ensure_parent_dir(const char *path)
+{
+  char *slash = strrchr(path, '/');
+  if (slash)
+  {
+    *slash = '\0';
+    mar_ensure_parent_dir(path);
+#ifdef XP_WIN
+    _mkdir(path);
+#else
+    mkdir(path, 0755);
+#endif
+    *slash = '/';
+  }
+  return 0;
+}
+
+static int mar_test_callback(MarFile *mar, const MarItem *item, void *unused) {
+  FILE *fp;
+  char buf[BLOCKSIZE];
+  int fd, len, offset = 0;
+
+  if (mar_ensure_parent_dir(item->name))
+    return -1;
+
+#ifdef XP_WIN
+  fd = _open(item->name, _O_BINARY|_O_CREAT|_O_TRUNC|_O_WRONLY, item->flags);
+#else
+  fd = creat(item->name, item->flags);
+#endif
+  if (fd == -1) {
+    fprintf(stderr, "ERROR: could not create file in mar_test_callback()\n");
+    perror(item->name);
+    return -1;
+  }
+
+  fp = fdopen(fd, "wb");
+  if (!fp)
+    return -1;
+
+  while ((len = mar_read(mar, item, offset, buf, sizeof(buf))) > 0) {
+    if (fwrite(buf, len, 1, fp) != 1)
+      break;
+    offset += len;
+  }
+
+  fclose(fp);
+  return len == 0 ? 0 : -1;
+}
+
+int mar_extract(const char *path) {
+  MarFile *mar;
+  int rv;
+
+  mar = mar_open(path);
+  if (!mar)
+    return -1;
+
+  rv = mar_enum_items(mar, mar_test_callback, NULL);
+
+  mar_close(mar);
+  return rv;
+}
diff --git a/modules/libmar/src/mar_private.h b/modules/libmar/src/mar_private.h
new file mode 100644
index 000000000..e0c263271
--- /dev/null
+++ b/modules/libmar/src/mar_private.h
@@ -0,0 +1,79 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MAR_PRIVATE_H__
+#define MAR_PRIVATE_H__
+
+#include "limits.h"
+#include "mozilla/Assertions.h"
+#include <stdint.h>
+
+#define BLOCKSIZE 4096
+#define ROUND_UP(n, incr) (((n) / (incr) + 1) * (incr))
+
+#define MAR_ID "MAR1"
+#define MAR_ID_SIZE 4
+
+/* The signature block comes directly after the header block 
+   which is 16 bytes */
+#define SIGNATURE_BLOCK_OFFSET 16
+
+/* Make sure the file is less than 500MB.  We do this to protect against
+   invalid MAR files. */
+#define MAX_SIZE_OF_MAR_FILE ((int64_t)524288000)
+
+/* Existing code makes assumptions that the file size is
+   smaller than LONG_MAX. */
+MOZ_STATIC_ASSERT(MAX_SIZE_OF_MAR_FILE < ((int64_t)LONG_MAX),
+                  "max mar file size is too big");
+
+/* We store at most the size up to the signature block + 4 
+   bytes per BLOCKSIZE bytes */
+MOZ_STATIC_ASSERT(sizeof(BLOCKSIZE) < \
+                  (SIGNATURE_BLOCK_OFFSET + sizeof(uint32_t)),
+                  "BLOCKSIZE is too big");
+
+/* The maximum size of any signature supported by current and future
+   implementations of the signmar program. */
+#define MAX_SIGNATURE_LENGTH 2048
+
+/* Each additional block has a unique ID.  
+   The product information block has an ID of 1. */
+#define PRODUCT_INFO_BLOCK_ID 1
+
+#define MAR_ITEM_SIZE(namelen) (3*sizeof(uint32_t) + (namelen) + 1)
+
+/* Product Information Block (PIB) constants */
+#define PIB_MAX_MAR_CHANNEL_ID_SIZE 63
+#define PIB_MAX_PRODUCT_VERSION_SIZE 31
+
+/* The mar program is compiled as a host bin so we don't have access to NSPR at
+   runtime.  For that reason we use ntohl, htonl, and define HOST_TO_NETWORK64 
+   instead of the NSPR equivalents. */
+#ifdef XP_WIN
+#include <winsock2.h>
+#define ftello _ftelli64
+#define fseeko _fseeki64
+#else
+#define _FILE_OFFSET_BITS 64
+#include <netinet/in.h>
+#include <unistd.h>
+#endif
+
+#include <stdio.h>
+
+#define HOST_TO_NETWORK64(x) ( \
+  ((((uint64_t) x) & 0xFF) << 56) | \
+  ((((uint64_t) x) >> 8) & 0xFF) << 48) | \
+  (((((uint64_t) x) >> 16) & 0xFF) << 40) | \
+  (((((uint64_t) x) >> 24) & 0xFF) << 32) | \
+  (((((uint64_t) x) >> 32) & 0xFF) << 24) | \
+  (((((uint64_t) x) >> 40) & 0xFF) << 16) | \
+  (((((uint64_t) x) >> 48) & 0xFF) << 8) | \
+  (((uint64_t) x) >> 56)
+#define NETWORK_TO_HOST64 HOST_TO_NETWORK64
+
+#endif  /* MAR_PRIVATE_H__ */
diff --git a/modules/libmar/src/mar_read.c b/modules/libmar/src/mar_read.c
new file mode 100644
index 000000000..17744cdfc
--- /dev/null
+++ b/modules/libmar/src/mar_read.c
@@ -0,0 +1,577 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include "mar_private.h"
+#include "mar.h"
+
+#ifdef XP_WIN
+#include <winsock2.h>
+#else
+#include <netinet/in.h>
+#endif
+
+
+/* this is the same hash algorithm used by nsZipArchive.cpp */
+static uint32_t mar_hash_name(const char *name) {
+  uint32_t val = 0;
+  unsigned char* c;
+
+  for (c = (unsigned char *) name; *c; ++c)
+    val = val*37 + *c;
+
+  return val % TABLESIZE;
+}
+
+static int mar_insert_item(MarFile *mar, const char *name, int namelen,
+                           uint32_t offset, uint32_t length, uint32_t flags) {
+  MarItem *item, *root;
+  uint32_t hash;
+  
+  item = (MarItem *) malloc(sizeof(MarItem) + namelen);
+  if (!item)
+    return -1;
+  item->next = NULL;
+  item->offset = offset;
+  item->length = length;
+  item->flags = flags;
+  memcpy(item->name, name, namelen + 1);
+
+  hash = mar_hash_name(name);
+
+  root = mar->item_table[hash];
+  if (!root) {
+    mar->item_table[hash] = item;
+  } else {
+    /* append item */
+    while (root->next)
+      root = root->next;
+    root->next = item;
+  }
+  return 0;
+}
+
+static int mar_consume_index(MarFile *mar, char **buf, const char *buf_end) {
+  /*
+   * Each item has the following structure:
+   *   uint32_t offset      (network byte order)
+   *   uint32_t length      (network byte order)
+   *   uint32_t flags       (network byte order)
+   *   char     name[N]     (where N >= 1)
+   *   char     null_byte;
+   */
+  uint32_t offset;
+  uint32_t length;
+  uint32_t flags;
+  const char *name;
+  int namelen;
+
+  if ((buf_end - *buf) < (int)(3*sizeof(uint32_t) + 2))
+    return -1;
+
+  memcpy(&offset, *buf, sizeof(offset));
+  *buf += sizeof(offset);
+
+  memcpy(&length, *buf, sizeof(length));
+  *buf += sizeof(length);
+
+  memcpy(&flags, *buf, sizeof(flags));
+  *buf += sizeof(flags);
+
+  offset = ntohl(offset);
+  length = ntohl(length);
+  flags = ntohl(flags);
+
+  name = *buf;
+  /* find namelen; must take care not to read beyond buf_end */
+  while (**buf) {
+    /* buf_end points one byte past the end of buf's allocation */
+    if (*buf == (buf_end - 1))
+      return -1;
+    ++(*buf);
+  }
+  namelen = (*buf - name);
+  /* must ensure that namelen is valid */
+  if (namelen < 0) {
+    return -1;
+  }
+  /* consume null byte */
+  if (*buf == buf_end)
+    return -1;
+  ++(*buf);
+
+  return mar_insert_item(mar, name, namelen, offset, length, flags);
+}
+
+static int mar_read_index(MarFile *mar) {
+  char id[MAR_ID_SIZE], *buf, *bufptr, *bufend;
+  uint32_t offset_to_index, size_of_index;
+
+  /* verify MAR ID */
+  if (fread(id, MAR_ID_SIZE, 1, mar->fp) != 1)
+    return -1;
+  if (memcmp(id, MAR_ID, MAR_ID_SIZE) != 0)
+    return -1;
+
+  if (fread(&offset_to_index, sizeof(uint32_t), 1, mar->fp) != 1)
+    return -1;
+  offset_to_index = ntohl(offset_to_index);
+
+  if (fseek(mar->fp, offset_to_index, SEEK_SET))
+    return -1;
+  if (fread(&size_of_index, sizeof(uint32_t), 1, mar->fp) != 1)
+    return -1;
+  size_of_index = ntohl(size_of_index);
+
+  buf = (char *) malloc(size_of_index);
+  if (!buf)
+    return -1;
+  if (fread(buf, size_of_index, 1, mar->fp) != 1) {
+    free(buf);
+    return -1;
+  }
+
+  bufptr = buf;
+  bufend = buf + size_of_index;
+  while (bufptr < bufend && mar_consume_index(mar, &bufptr, bufend) == 0);
+
+  free(buf);
+  return (bufptr == bufend) ? 0 : -1;
+}
+
+/**
+ * Internal shared code for mar_open and mar_wopen.
+ * On failure, will fclose(fp).
+ */
+static MarFile *mar_fpopen(FILE *fp)
+{
+  MarFile *mar;
+
+  mar = (MarFile *) malloc(sizeof(*mar));
+  if (!mar) {
+    fclose(fp);
+    return NULL;
+  }
+
+  mar->fp = fp;
+  memset(mar->item_table, 0, sizeof(mar->item_table));
+  if (mar_read_index(mar)) {
+    mar_close(mar);
+    return NULL;
+  }
+
+  return mar;
+}
+
+MarFile *mar_open(const char *path) {
+  FILE *fp;
+
+  fp = fopen(path, "rb");
+  if (!fp) {
+    fprintf(stderr, "ERROR: could not open file in mar_open()\n");
+    perror(path);
+    return NULL;
+  }
+
+  return mar_fpopen(fp);
+}
+
+#ifdef XP_WIN
+MarFile *mar_wopen(const wchar_t *path) {
+  FILE *fp;
+
+  _wfopen_s(&fp, path, L"rb");
+  if (!fp) {
+    fprintf(stderr, "ERROR: could not open file in mar_wopen()\n");
+    _wperror(path);
+    return NULL;
+  }
+
+  return mar_fpopen(fp);
+}
+#endif
+
+void mar_close(MarFile *mar) {
+  MarItem *item;
+  int i;
+
+  fclose(mar->fp);
+
+  for (i = 0; i < TABLESIZE; ++i) {
+    item = mar->item_table[i];
+    while (item) {
+      MarItem *temp = item;
+      item = item->next;
+      free(temp);
+    }
+  }
+
+  free(mar);
+}
+
+/**
+ * Determines the MAR file information.
+ *
+ * @param fp                     An opened MAR file in read mode.
+ * @param hasSignatureBlock      Optional out parameter specifying if the MAR
+ *                               file has a signature block or not.
+ * @param numSignatures          Optional out parameter for storing the number
+ *                               of signatures in the MAR file.
+ * @param hasAdditionalBlocks    Optional out parameter specifying if the MAR
+ *                               file has additional blocks or not.
+ * @param offsetAdditionalBlocks Optional out parameter for the offset to the 
+ *                               first additional block. Value is only valid if
+ *                               hasAdditionalBlocks is not equal to 0.
+ * @param numAdditionalBlocks    Optional out parameter for the number of
+ *                               additional blocks.  Value is only valid if
+ *                               hasAdditionalBlocks is not equal to 0.
+ * @return 0 on success and non-zero on failure.
+ */
+int get_mar_file_info_fp(FILE *fp, 
+                         int *hasSignatureBlock,
+                         uint32_t *numSignatures,
+                         int *hasAdditionalBlocks,
+                         uint32_t *offsetAdditionalBlocks,
+                         uint32_t *numAdditionalBlocks)
+{
+  uint32_t offsetToIndex, offsetToContent, signatureCount, signatureLen, i;
+  
+  /* One of hasSignatureBlock or hasAdditionalBlocks must be non NULL */
+  if (!hasSignatureBlock && !hasAdditionalBlocks) {
+    return -1;
+  }
+
+
+  /* Skip to the start of the offset index */
+  if (fseek(fp, MAR_ID_SIZE, SEEK_SET)) {
+    return -1;
+  }
+
+  /* Read the offset to the index. */
+  if (fread(&offsetToIndex, sizeof(offsetToIndex), 1, fp) != 1) {
+    return -1;
+  }
+  offsetToIndex = ntohl(offsetToIndex);
+
+  if (numSignatures) {
+     /* Skip past the MAR file size field */
+    if (fseek(fp, sizeof(uint64_t), SEEK_CUR)) {
+      return -1;
+    }
+
+    /* Read the number of signatures field */
+    if (fread(numSignatures, sizeof(*numSignatures), 1, fp) != 1) {
+      return -1;
+    }
+    *numSignatures = ntohl(*numSignatures);
+  }
+
+  /* Skip to the first index entry past the index size field 
+     We do it in 2 calls because offsetToIndex + sizeof(uint32_t) 
+     could oerflow in theory. */
+  if (fseek(fp, offsetToIndex, SEEK_SET)) {
+    return -1;
+  }
+
+  if (fseek(fp, sizeof(uint32_t), SEEK_CUR)) {
+    return -1;
+  }
+
+  /* Read the first offset to content field. */
+  if (fread(&offsetToContent, sizeof(offsetToContent), 1, fp) != 1) {
+    return -1;
+  }
+  offsetToContent = ntohl(offsetToContent);
+
+  /* Check if we have a new or old MAR file */
+  if (hasSignatureBlock) {
+    if (offsetToContent == MAR_ID_SIZE + sizeof(uint32_t)) {
+      *hasSignatureBlock = 0;
+    } else {
+      *hasSignatureBlock = 1;
+    }
+  }
+
+  /* If the caller doesn't care about the product info block 
+     value, then just return */
+  if (!hasAdditionalBlocks) {
+    return 0;
+  }
+
+   /* Skip to the start of the signature block */
+  if (fseeko(fp, SIGNATURE_BLOCK_OFFSET, SEEK_SET)) {
+    return -1;
+  }
+
+  /* Get the number of signatures */
+  if (fread(&signatureCount, sizeof(signatureCount), 1, fp) != 1) {
+    return -1;
+  }
+  signatureCount = ntohl(signatureCount);
+
+  /* Check that we have less than the max amount of signatures so we don't
+     waste too much of either updater's or signmar's time. */
+  if (signatureCount > MAX_SIGNATURES) {
+    return -1;
+  }
+
+  /* Skip past the whole signature block */
+  for (i = 0; i < signatureCount; i++) {
+    /* Skip past the signature algorithm ID */
+    if (fseek(fp, sizeof(uint32_t), SEEK_CUR)) {
+      return -1;
+    }
+
+    /* Read the signature length and skip past the signature */
+    if (fread(&signatureLen, sizeof(uint32_t), 1, fp) != 1) {
+      return -1;
+    }
+    signatureLen = ntohl(signatureLen);
+    if (fseek(fp, signatureLen, SEEK_CUR)) {
+      return -1;
+    }
+  }
+
+  if ((int64_t)ftell(fp) == (int64_t)offsetToContent) {
+    *hasAdditionalBlocks = 0;
+  } else {
+    if (numAdditionalBlocks) {
+      /* We have an additional block, so read in the number of additional blocks
+         and set the offset. */
+      *hasAdditionalBlocks = 1;
+      if (fread(numAdditionalBlocks, sizeof(uint32_t), 1, fp) != 1) {
+        return -1;
+      }
+      *numAdditionalBlocks = ntohl(*numAdditionalBlocks);
+      if (offsetAdditionalBlocks) {
+        *offsetAdditionalBlocks = ftell(fp);
+      }
+    } else if (offsetAdditionalBlocks) {
+      /* numAdditionalBlocks is not specified but offsetAdditionalBlocks 
+         is, so fill it! */
+      *offsetAdditionalBlocks = ftell(fp) + sizeof(uint32_t);
+    }
+  }
+
+  return 0;
+}
+
+/** 
+ * Reads the product info block from the MAR file's additional block section.
+ * The caller is responsible for freeing the fields in infoBlock
+ * if the return is successful.
+ *
+ * @param infoBlock Out parameter for where to store the result to
+ * @return 0 on success, -1 on failure
+*/
+int
+read_product_info_block(char *path, 
+                        struct ProductInformationBlock *infoBlock)
+{
+  int rv;
+  MarFile mar;
+  mar.fp = fopen(path, "rb");
+  if (!mar.fp) {
+    fprintf(stderr, "ERROR: could not open file in read_product_info_block()\n");
+    perror(path);
+    return -1;
+  }
+  rv = mar_read_product_info_block(&mar, infoBlock);
+  fclose(mar.fp);
+  return rv;
+}
+
+/** 
+ * Reads the product info block from the MAR file's additional block section.
+ * The caller is responsible for freeing the fields in infoBlock
+ * if the return is successful.
+ *
+ * @param infoBlock Out parameter for where to store the result to
+ * @return 0 on success, -1 on failure
+*/
+int
+mar_read_product_info_block(MarFile *mar, 
+                            struct ProductInformationBlock *infoBlock)
+{
+  uint32_t i, offsetAdditionalBlocks, numAdditionalBlocks,
+    additionalBlockSize, additionalBlockID;
+  int hasAdditionalBlocks;
+
+  /* The buffer size is 97 bytes because the MAR channel name < 64 bytes, and 
+     product version < 32 bytes + 3 NULL terminator bytes. */
+  char buf[97] = { '\0' };
+  if (get_mar_file_info_fp(mar->fp, NULL, NULL,
+                           &hasAdditionalBlocks,
+                           &offsetAdditionalBlocks,
+                           &numAdditionalBlocks) != 0) {
+    return -1;
+  }
+  for (i = 0; i < numAdditionalBlocks; ++i) {
+    /* Read the additional block size */
+    if (fread(&additionalBlockSize, 
+              sizeof(additionalBlockSize), 
+              1, mar->fp) != 1) {
+      return -1;
+    }
+    additionalBlockSize = ntohl(additionalBlockSize) - 
+                          sizeof(additionalBlockSize) - 
+                          sizeof(additionalBlockID);
+
+    /* Read the additional block ID */
+    if (fread(&additionalBlockID, 
+              sizeof(additionalBlockID), 
+              1, mar->fp) != 1) {
+      return -1;
+    }
+    additionalBlockID = ntohl(additionalBlockID);
+
+    if (PRODUCT_INFO_BLOCK_ID == additionalBlockID) {
+      const char *location;
+      int len;
+
+      /* This block must be at most 104 bytes.
+         MAR channel name < 64 bytes, and product version < 32 bytes + 3 NULL 
+         terminator bytes. We only check for 96 though because we remove 8 
+         bytes above from the additionalBlockSize: We subtract 
+         sizeof(additionalBlockSize) and sizeof(additionalBlockID) */
+      if (additionalBlockSize > 96) {
+        return -1;
+      }
+
+    if (fread(buf, additionalBlockSize, 1, mar->fp) != 1) {
+        return -1;
+      }
+
+      /* Extract the MAR channel name from the buffer.  For now we
+         point to the stack allocated buffer but we strdup this
+         if we are within bounds of each field's max length. */
+      location = buf;
+      len = strlen(location);
+      infoBlock->MARChannelID = location;
+      location += len + 1;
+      if (len >= 64) {
+        infoBlock->MARChannelID = NULL;
+        return -1;
+      }
+
+      /* Extract the version from the buffer */
+      len = strlen(location);
+      infoBlock->productVersion = location;
+      location += len + 1;
+      if (len >= 32) {
+        infoBlock->MARChannelID = NULL;
+        infoBlock->productVersion = NULL;
+        return -1;
+      }
+      infoBlock->MARChannelID = 
+        strdup(infoBlock->MARChannelID);
+      infoBlock->productVersion = 
+        strdup(infoBlock->productVersion);
+      return 0;
+    } else {
+      /* This is not the additional block you're looking for. Move along. */
+      if (fseek(mar->fp, additionalBlockSize, SEEK_CUR)) {
+        return -1;
+      }
+    }
+  }
+
+  /* If we had a product info block we would have already returned */
+  return -1;
+}
+
+const MarItem *mar_find_item(MarFile *mar, const char *name) {
+  uint32_t hash;
+  const MarItem *item;
+
+  hash = mar_hash_name(name);
+
+  item = mar->item_table[hash];
+  while (item && strcmp(item->name, name) != 0)
+    item = item->next;
+
+  return item;
+}
+
+int mar_enum_items(MarFile *mar, MarItemCallback callback, void *closure) {
+  MarItem *item;
+  int i;
+
+  for (i = 0; i < TABLESIZE; ++i) {
+    item = mar->item_table[i];
+    while (item) {
+      int rv = callback(mar, item, closure);
+      if (rv)
+        return rv;
+      item = item->next;
+    }
+  }
+
+  return 0;
+}
+
+int mar_read(MarFile *mar, const MarItem *item, int offset, char *buf,
+             int bufsize) {
+  int nr;
+
+  if (offset == (int) item->length)
+    return 0;
+  if (offset > (int) item->length)
+    return -1;
+
+  nr = item->length - offset;
+  if (nr > bufsize)
+    nr = bufsize;
+
+  if (fseek(mar->fp, item->offset + offset, SEEK_SET))
+    return -1;
+
+  return fread(buf, 1, nr, mar->fp);
+}
+
+/**
+ * Determines the MAR file information.
+ *
+ * @param path                   The path of the MAR file to check.
+ * @param hasSignatureBlock      Optional out parameter specifying if the MAR
+ *                               file has a signature block or not.
+ * @param numSignatures          Optional out parameter for storing the number
+ *                               of signatures in the MAR file.
+ * @param hasAdditionalBlocks    Optional out parameter specifying if the MAR
+ *                               file has additional blocks or not.
+ * @param offsetAdditionalBlocks Optional out parameter for the offset to the 
+ *                               first additional block. Value is only valid if
+ *                               hasAdditionalBlocks is not equal to 0.
+ * @param numAdditionalBlocks    Optional out parameter for the number of
+ *                               additional blocks.  Value is only valid if
+ *                               has_additional_blocks is not equal to 0.
+ * @return 0 on success and non-zero on failure.
+ */
+int get_mar_file_info(const char *path, 
+                      int *hasSignatureBlock,
+                      uint32_t *numSignatures,
+                      int *hasAdditionalBlocks,
+                      uint32_t *offsetAdditionalBlocks,
+                      uint32_t *numAdditionalBlocks)
+{
+  int rv;
+  FILE *fp = fopen(path, "rb");
+  if (!fp) {
+    fprintf(stderr, "ERROR: could not open file in get_mar_file_info()\n");
+    perror(path);
+    return -1;
+  }
+
+  rv = get_mar_file_info_fp(fp, hasSignatureBlock, 
+                            numSignatures, hasAdditionalBlocks,
+                            offsetAdditionalBlocks, numAdditionalBlocks);
+
+  fclose(fp);
+  return rv;
+}
diff --git a/modules/libmar/src/moz.build b/modules/libmar/src/moz.build
new file mode 100644
index 000000000..61c96fbd5
--- /dev/null
+++ b/modules/libmar/src/moz.build
@@ -0,0 +1,30 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXPORTS += [
+    'mar.h',
+    'mar_cmdline.h',
+]
+
+HOST_SOURCES += [
+    'mar_create.c',
+    'mar_extract.c',
+    'mar_read.c',
+]
+HostLibrary('hostmar')
+
+Library('mar')
+
+UNIFIED_SOURCES += [
+    'mar_create.c',
+    'mar_extract.c',
+    'mar_read.c',
+]
+
+FORCE_STATIC_LIB = True
+
+if CONFIG['OS_ARCH'] == 'WINNT':
+    USE_STATIC_LIBS = True
diff --git a/modules/libmar/tests/moz.build b/modules/libmar/tests/moz.build
new file mode 100644
index 000000000..9642553e8
--- /dev/null
+++ b/modules/libmar/tests/moz.build
@@ -0,0 +1,12 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+XPCSHELL_TESTS_MANIFESTS += ['unit/xpcshell.ini']
+
+if CONFIG['OS_TARGET'] != 'Android':
+    TEST_HARNESS_FILES.xpcshell.modules.libmar.tests.unit += [
+        '!../tool/signmar%s' % CONFIG['BIN_SUFFIX'],
+    ]
diff --git a/modules/libmar/tests/unit/data/0_sized_file b/modules/libmar/tests/unit/data/0_sized_file
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/modules/libmar/tests/unit/data/0_sized_file
diff --git a/modules/libmar/tests/unit/data/0_sized_mar.mar b/modules/libmar/tests/unit/data/0_sized_mar.mar
new file mode 100644
index 000000000..a7d039e53
--- /dev/null
+++ b/modules/libmar/tests/unit/data/0_sized_mar.mar
diff --git a/modules/libmar/tests/unit/data/1_byte_file b/modules/libmar/tests/unit/data/1_byte_file
new file mode 100644
index 000000000..56a6051ca
--- /dev/null
+++ b/modules/libmar/tests/unit/data/1_byte_file
@@ -0,0 +1 @@
+1
\ No newline at end of file
diff --git a/modules/libmar/tests/unit/data/1_byte_mar.mar b/modules/libmar/tests/unit/data/1_byte_mar.mar
new file mode 100644
index 000000000..4df020099
--- /dev/null
+++ b/modules/libmar/tests/unit/data/1_byte_mar.mar
diff --git a/modules/libmar/tests/unit/data/binary_data_file b/modules/libmar/tests/unit/data/binary_data_file
new file mode 100644
index 000000000..a0d7369e4
--- /dev/null
+++ b/modules/libmar/tests/unit/data/binary_data_file
diff --git a/modules/libmar/tests/unit/data/binary_data_mar.mar b/modules/libmar/tests/unit/data/binary_data_mar.mar
new file mode 100644
index 000000000..7632c2295
--- /dev/null
+++ b/modules/libmar/tests/unit/data/binary_data_mar.mar
diff --git a/modules/libmar/tests/unit/data/cert8.db b/modules/libmar/tests/unit/data/cert8.db
new file mode 100644
index 000000000..43551f129
--- /dev/null
+++ b/modules/libmar/tests/unit/data/cert8.db
diff --git a/modules/libmar/tests/unit/data/key3.db b/modules/libmar/tests/unit/data/key3.db
new file mode 100644
index 000000000..7c7203bb4
--- /dev/null
+++ b/modules/libmar/tests/unit/data/key3.db
diff --git a/modules/libmar/tests/unit/data/manipulated_signed_mar.mar b/modules/libmar/tests/unit/data/manipulated_signed_mar.mar
new file mode 100644
index 000000000..4ce15f122
--- /dev/null
+++ b/modules/libmar/tests/unit/data/manipulated_signed_mar.mar
diff --git a/modules/libmar/tests/unit/data/multiple_file_mar.mar b/modules/libmar/tests/unit/data/multiple_file_mar.mar
new file mode 100644
index 000000000..fa64edca4
--- /dev/null
+++ b/modules/libmar/tests/unit/data/multiple_file_mar.mar
diff --git a/modules/libmar/tests/unit/data/multiple_signed_no_pib_mar.mar b/modules/libmar/tests/unit/data/multiple_signed_no_pib_mar.mar
new file mode 100644
index 000000000..5832b526f
--- /dev/null
+++ b/modules/libmar/tests/unit/data/multiple_signed_no_pib_mar.mar
diff --git a/modules/libmar/tests/unit/data/multiple_signed_pib_mar.mar b/modules/libmar/tests/unit/data/multiple_signed_pib_mar.mar
new file mode 100644
index 000000000..11c4cbedc
--- /dev/null
+++ b/modules/libmar/tests/unit/data/multiple_signed_pib_mar.mar
diff --git a/modules/libmar/tests/unit/data/multiple_signed_pib_mar.sig.0 b/modules/libmar/tests/unit/data/multiple_signed_pib_mar.sig.0
new file mode 100644
index 000000000..412265537
--- /dev/null
+++ b/modules/libmar/tests/unit/data/multiple_signed_pib_mar.sig.0
@@ -0,0 +1,6 @@
+myuujl0MBwyLCrp8I84HrDbGLe+T5yfAR869QWvhcet/CglmuEsQEJczAoK8PtOR

+HcqczCRFtxNRKDPOUC0i+CS7RAQG4XJd9uprqHtB28s4SR/9nXKfWDnH2UYq9hkt

+X6qTab9M9ySrugOugomDb3ej/qYoNfJN9RnkLP4GP+cl96bWPU33rL0Uu7sUKizu

+QoYzxKeZ0r9hGMpOP2l/Jn+pydoEWGVB1mzvIFLPqD9cShUvV80xs8teV0G9IncC

+ZRuBwwNkfMTgJDCnxbrw3gIqNXMN1zjssztyJIpT2q8JGs+F6H0wz515xm32dCdQ

+b3Oo8a9Dx28NKKq83DJDQA==
\ No newline at end of file
diff --git a/modules/libmar/tests/unit/data/multiple_signed_pib_mar.sig.1 b/modules/libmar/tests/unit/data/multiple_signed_pib_mar.sig.1
new file mode 100644
index 000000000..36b917431
--- /dev/null
+++ b/modules/libmar/tests/unit/data/multiple_signed_pib_mar.sig.1
@@ -0,0 +1,6 @@
+xSnuhHyf8iEdPnRgNw9w0Tu6dJimNv+etdZagvbftkGuBlQArhPn7unCOEQ+jS0n

+ummJHp1yv64Q7Tte4te8OpRaR6eE333bHfFp++cKKJ2jWFeZ1SwRn59cWX0w4z9u

+I4VJmqzOKDUgZq24m6MfGr9iRKbrDjDgvfapzRkZNNU/I0jv20+G+vIUysQGLSN7

+fMAxxeurZNbinIiFQyudSpLU2n5PJDh/FIX2lt8H8nX5/yNyznbz0Gm+/hGMZj7+

+EfPxLxyOuSRVxI0ebAcRBQJLiyEh1iIluvjuBKohCxkWkEZG3weCz29JxdWOzobj

+3/6D+xJW5M1V8aE7EEjt4w==
\ No newline at end of file
diff --git a/modules/libmar/tests/unit/data/multiple_signed_pib_mar.sig.2 b/modules/libmar/tests/unit/data/multiple_signed_pib_mar.sig.2
new file mode 100644
index 000000000..a6561248f
--- /dev/null
+++ b/modules/libmar/tests/unit/data/multiple_signed_pib_mar.sig.2
@@ -0,0 +1,6 @@
+VQmSlk8q2tmSd+C/d3ADde0lQoJw611sWboc7GOnFTRRsO0D61fIl3tlXLn/N4vN

+fCHQxwrszCizC1ddt9Bf5ujBqcAx+ZrN+iT2NlK2j6TN6K1W8LENJgCE7IXN5h1G

+VVryo5OkJzWd50DLX/qL9EAg3wx+P3b2BWXkhMuCDGvtAL3C4Ffnm7dw0hjErsEV

+X0cB5O5ozM0dOih+GNNX++wxT8E1NqNJOGaJR1KYeY17agz+QlSvFt/fL/a64Fsw

+DtOeGZ79nQZ6qkbmUxLXDQ630y3AQ8ceMJFIlI+T3Tk1DUuAWUpMXOICaqzDCdh+

+QC5nuQ7OK8Ycbm5fkIFfNQ==
\ No newline at end of file
diff --git a/modules/libmar/tests/unit/data/multiple_signed_pib_mar_2.mar b/modules/libmar/tests/unit/data/multiple_signed_pib_mar_2.mar
new file mode 100644
index 000000000..f31f1df20
--- /dev/null
+++ b/modules/libmar/tests/unit/data/multiple_signed_pib_mar_2.mar
diff --git a/modules/libmar/tests/unit/data/mycert.der b/modules/libmar/tests/unit/data/mycert.der
new file mode 100644
index 000000000..185b2dff4
--- /dev/null
+++ b/modules/libmar/tests/unit/data/mycert.der
diff --git a/modules/libmar/tests/unit/data/mycert2.der b/modules/libmar/tests/unit/data/mycert2.der
new file mode 100644
index 000000000..625b80e68
--- /dev/null
+++ b/modules/libmar/tests/unit/data/mycert2.der
diff --git a/modules/libmar/tests/unit/data/mycert3.der b/modules/libmar/tests/unit/data/mycert3.der
new file mode 100644
index 000000000..bff05a6cf
--- /dev/null
+++ b/modules/libmar/tests/unit/data/mycert3.der
diff --git a/modules/libmar/tests/unit/data/no_pib_mar.mar b/modules/libmar/tests/unit/data/no_pib_mar.mar
new file mode 100644
index 000000000..8976e7d73
--- /dev/null
+++ b/modules/libmar/tests/unit/data/no_pib_mar.mar
diff --git a/modules/libmar/tests/unit/data/secmod.db b/modules/libmar/tests/unit/data/secmod.db
new file mode 100644
index 000000000..4c2e0cc78
--- /dev/null
+++ b/modules/libmar/tests/unit/data/secmod.db
diff --git a/modules/libmar/tests/unit/data/signed_no_pib_mar.mar b/modules/libmar/tests/unit/data/signed_no_pib_mar.mar
new file mode 100644
index 000000000..f6e449e3e
--- /dev/null
+++ b/modules/libmar/tests/unit/data/signed_no_pib_mar.mar
diff --git a/modules/libmar/tests/unit/data/signed_pib_mar.mar b/modules/libmar/tests/unit/data/signed_pib_mar.mar
new file mode 100644
index 000000000..72f4c25ec
--- /dev/null
+++ b/modules/libmar/tests/unit/data/signed_pib_mar.mar
diff --git a/modules/libmar/tests/unit/data/signed_pib_mar.signature.0 b/modules/libmar/tests/unit/data/signed_pib_mar.signature.0
new file mode 100644
index 000000000..31cca345d
--- /dev/null
+++ b/modules/libmar/tests/unit/data/signed_pib_mar.signature.0
@@ -0,0 +1,6 @@
+VTw+yunNUglvAxNevIP1A+1aWNgD479tbZy4t8uDuC9AJ0nLeLXYBfklGxaKCzo4

+/UdWFfv1gJmqbnCAlZrZ9UJLUVZOUAwKb+V90bC7pBnGy7xplKBDm40SIs4fwWZl

+EGRt8GCPjYKgsYp+jScNMD8B4J3bPSR7m0c1TjXV4pZMhT7LJ+iLfHiy5+WiGBgZ

+9qor7plYxfZFgg4moAA3iIXIJbNORUEWfz9b7rsMmiwZO4XmMSDNUutkj9Jl+9gB

+XRwrwL0QLvAuYwIzB0HDdl/LPCC+UDEMKigcPhjwFnpN17qUks0fRxId8e4P8m2H

+rumgMHGhwx3uagGTTufQSw==
\ No newline at end of file
diff --git a/modules/libmar/tests/unit/data/signed_pib_mar.signature.mycert2 b/modules/libmar/tests/unit/data/signed_pib_mar.signature.mycert2
new file mode 100644
index 000000000..8818ca3fc
--- /dev/null
+++ b/modules/libmar/tests/unit/data/signed_pib_mar.signature.mycert2
@@ -0,0 +1,6 @@
+wYPEMA2nfrMfkL5+//r9Of8JicdmG5KxAzYUhSR3d/vr075LhGkc6nQc5orDIRnz

+vuMBRIqoAsK3IdtCEbZ6rRKN9d+N7HfvmLdDXGpK3lr9NKKTnk1n/0o7ziRi3Fm8

+hOkJpdit7OHV0RH5GBSM8tQziXGN+qe51W2otMA4d8+oa4tp2D7W4SSUxxJwBPiu

+5CJAA68qaxzhWd5iVtU8mcjbYOKZAciIPgqBxhgmukqNrShQpnwcop/WHggL7lxI

+QWZYpuU6MMxVmLSiAAEAwLMwL2UqHxcGQjIuepu9ikbJ251SwxYiH3xRMkYpQNNv

+YFEb9pm2HJq9oNgZUGakDQ==
\ No newline at end of file
diff --git a/modules/libmar/tests/unit/data/signed_pib_mar_with_mycert2.mar b/modules/libmar/tests/unit/data/signed_pib_mar_with_mycert2.mar
new file mode 100644
index 000000000..41ad2b3f9
--- /dev/null
+++ b/modules/libmar/tests/unit/data/signed_pib_mar_with_mycert2.mar
diff --git a/modules/libmar/tests/unit/data/win_0_sized_mar.mar b/modules/libmar/tests/unit/data/win_0_sized_mar.mar
new file mode 100644
index 000000000..357eeb9a8
--- /dev/null
+++ b/modules/libmar/tests/unit/data/win_0_sized_mar.mar
diff --git a/modules/libmar/tests/unit/data/win_1_byte_mar.mar b/modules/libmar/tests/unit/data/win_1_byte_mar.mar
new file mode 100644
index 000000000..a137f11ad
--- /dev/null
+++ b/modules/libmar/tests/unit/data/win_1_byte_mar.mar
diff --git a/modules/libmar/tests/unit/data/win_binary_data_mar.mar b/modules/libmar/tests/unit/data/win_binary_data_mar.mar
new file mode 100644
index 000000000..7fef46989
--- /dev/null
+++ b/modules/libmar/tests/unit/data/win_binary_data_mar.mar
diff --git a/modules/libmar/tests/unit/data/win_multiple_file_mar.mar b/modules/libmar/tests/unit/data/win_multiple_file_mar.mar
new file mode 100644
index 000000000..183493a36
--- /dev/null
+++ b/modules/libmar/tests/unit/data/win_multiple_file_mar.mar
diff --git a/modules/libmar/tests/unit/data/win_multiple_signed_no_pib_mar.mar b/modules/libmar/tests/unit/data/win_multiple_signed_no_pib_mar.mar
new file mode 100644
index 000000000..9c0c213c7
--- /dev/null
+++ b/modules/libmar/tests/unit/data/win_multiple_signed_no_pib_mar.mar
diff --git a/modules/libmar/tests/unit/data/win_multiple_signed_pib_mar.mar b/modules/libmar/tests/unit/data/win_multiple_signed_pib_mar.mar
new file mode 100644
index 000000000..3c765fd93
--- /dev/null
+++ b/modules/libmar/tests/unit/data/win_multiple_signed_pib_mar.mar
diff --git a/modules/libmar/tests/unit/data/win_signed_no_pib_mar.mar b/modules/libmar/tests/unit/data/win_signed_no_pib_mar.mar
new file mode 100644
index 000000000..f6e449e3e
--- /dev/null
+++ b/modules/libmar/tests/unit/data/win_signed_no_pib_mar.mar
diff --git a/modules/libmar/tests/unit/data/win_signed_pib_mar.mar b/modules/libmar/tests/unit/data/win_signed_pib_mar.mar
new file mode 100644
index 000000000..8d854a1ce
--- /dev/null
+++ b/modules/libmar/tests/unit/data/win_signed_pib_mar.mar
diff --git a/modules/libmar/tests/unit/head_libmar.js b/modules/libmar/tests/unit/head_libmar.js
new file mode 100644
index 000000000..cd2da1414
--- /dev/null
+++ b/modules/libmar/tests/unit/head_libmar.js
@@ -0,0 +1,157 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+var Cc = Components.classes;
+var Ci = Components.interfaces;
+
+const refMARPrefix = (mozinfo.os == "win" ? "win_" : "");
+const BIN_SUFFIX = mozinfo.bin_suffix;
+
+var tempDir = do_get_tempdir();
+
+/**
+ * Compares binary data of 2 arrays and throws if they aren't the same.
+ * Throws on mismatch, does nothing on match.
+ *
+ * @param arr1 The first array to compare
+ * @param arr2 The second array to compare
+*/
+function compareBinaryData(arr1, arr2) {
+  do_check_eq(arr1.length, arr2.length);
+  for (let i = 0; i < arr1.length; i++) {
+    if (arr1[i] != arr2[i]) {
+      throw "Data differs at index " + i + 
+            ", arr1: " + arr1[i] + ", arr2: " + arr2[i];
+    }
+  }
+}
+
+/** 
+ * Reads a file's data and returns it
+ *
+ * @param file The file to read the data from
+ * @return a byte array for the data in the file.
+*/
+function getBinaryFileData(file) {
+  let fileStream = Cc["@mozilla.org/network/file-input-stream;1"].
+                   createInstance(Ci.nsIFileInputStream);
+  // Open as RD_ONLY with default permissions.
+  fileStream.init(file, -1, -1, null);
+
+  // Check the returned size versus the expected size.
+  let stream = Cc["@mozilla.org/binaryinputstream;1"].
+               createInstance(Ci.nsIBinaryInputStream);
+  stream.setInputStream(fileStream);
+  let bytes = stream.readByteArray(stream.available());
+  fileStream.close();
+  return bytes;
+}
+
+/**
+ * Runs each method in the passed in object
+ * Every method of the passed in object that starts with test_ will be ran
+ * The cleanup_per_test method of the object will be run right away, it will be
+ * registered to be the cleanup function, and it will be run between each test.
+ *
+ * @return The number of tests ran
+*/
+function run_tests(obj) {
+  let cleanup_per_test = obj.cleanup_per_test;
+  if (cleanup_per_test === undefined) {
+    cleanup_per_test = function() {};
+  }
+
+  do_register_cleanup(cleanup_per_test);
+
+  // Make sure there's nothing left over from a preious failed test
+  cleanup_per_test();
+
+  let ranCount = 0;
+  // hasOwnProperty ensures we only see direct properties and not all
+  for (let f in obj) {
+    if (typeof obj[f] === "function" && 
+        obj.hasOwnProperty(f) &&
+        f.toString().indexOf("test_") === 0) {
+      obj[f]();
+      cleanup_per_test();
+      ranCount++;
+    }
+  }
+  return ranCount;
+}
+
+/**
+ * Creates a MAR file with the content of files.
+ *
+ * @param outMAR  The file where the MAR should be created to
+ * @param dataDir The directory where the relative file paths exist
+ * @param files   The relative file paths of the files to include in the MAR
+*/
+function createMAR(outMAR, dataDir, files) {
+  // You cannot create an empy MAR.
+  do_check_true(files.length > 0);
+
+  // Get an nsIProcess to the signmar binary.
+  let process = Cc["@mozilla.org/process/util;1"].
+                createInstance(Ci.nsIProcess);
+  let signmarBin = do_get_file("signmar" + BIN_SUFFIX);
+
+  // Make sure the signmar binary exists and is an executable.
+  do_check_true(signmarBin.exists());
+  do_check_true(signmarBin.isExecutable());
+
+  // Ensure on non Windows platforms we encode the same permissions
+  // as the refernence MARs contain.  On Windows this is also safe.
+  // The reference MAR files have permissions of 0o664, so in case
+  // someone is running these tests locally with another permission
+  // (perhaps 0o777), make sure that we encode them as 0o664.
+  for (filePath of files) {
+    let f = dataDir.clone();
+    f.append(filePath);
+    f.permissions = 0o664;
+  }
+
+  // Setup the command line arguments to create the MAR.
+  let args = ["-C", dataDir.path, "-H", "\@MAR_CHANNEL_ID\@", 
+              "-V", "13.0a1", "-c", outMAR.path];
+  args = args.concat(files);
+
+  do_print('Running: ' + signmarBin.path);
+  process.init(signmarBin);
+  process.run(true, args, args.length);
+
+  // Verify signmar returned 0 for success.
+  do_check_eq(process.exitValue, 0);
+
+  // Verify the out MAR file actually exists.
+  do_check_true(outMAR.exists());
+}
+
+/**
+ * Extracts a MAR file to the specified output directory.
+ *
+ * @param mar     The MAR file that should be matched
+ * @param dataDir The directory to extract to
+*/
+function extractMAR(mar, dataDir) {
+  // Get an nsIProcess to the signmar binary.
+  let process = Cc["@mozilla.org/process/util;1"].
+                createInstance(Ci.nsIProcess);
+  let signmarBin = do_get_file("signmar" + BIN_SUFFIX);
+
+  // Make sure the signmar binary exists and is an executable.
+  do_check_true(signmarBin.exists());
+  do_check_true(signmarBin.isExecutable());
+
+  // Setup the command line arguments to create the MAR.
+  let args = ["-C", dataDir.path, "-x", mar.path];
+
+  do_print('Running: ' + signmarBin.path);
+  process.init(signmarBin);
+  process.run(true, args, args.length);
+
+  // Verify signmar returned 0 for success.
+  do_check_eq(process.exitValue, 0);
+}
+
+
diff --git a/modules/libmar/tests/unit/test_create.js b/modules/libmar/tests/unit/test_create.js
new file mode 100644
index 000000000..b6db280c9
--- /dev/null
+++ b/modules/libmar/tests/unit/test_create.js
@@ -0,0 +1,78 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function run_test() {
+
+  /**
+   * Creates MAR from the passed files, compares it to the reference MAR.
+   *
+   * @param refMARFileName The name of the MAR file that should match
+   * @param files          The files that should go in the created MAR
+   * @param checkNoMAR     If true return an error if a file already exists
+  */
+  function run_one_test(refMARFileName, files, checkNoMAR) {
+    if (checkNoMAR === undefined) {
+      checkNoMAR = true;
+    }
+
+    // Ensure the MAR we will create doesn't already exist.
+    let outMAR = tempDir.clone();
+    outMAR.append("out.mar");
+    if (checkNoMAR) {
+      do_check_false(outMAR.exists());
+    }
+
+    // Create the actual MAR file.
+    createMAR(outMAR, do_get_file("data"), files);
+
+    // Get the reference MAR data.
+    let refMAR = do_get_file("data/" + refMARFileName);
+    let refMARData = getBinaryFileData(refMAR);
+
+    // Verify the data of the MAR is what it should be.
+    let outMARData = getBinaryFileData(outMAR);
+    compareBinaryData(outMARData, refMARData);
+  }
+
+  // Define the unit tests to run.
+  let tests = {
+    // Test creating a MAR file with a 0 byte file.
+    test_zero_sized: function() {
+      return run_one_test(refMARPrefix + "0_sized_mar.mar", ["0_sized_file"]);
+    },
+    // Test creating a MAR file with a 1 byte file.
+    test_one_byte: function() {
+      return run_one_test(refMARPrefix + "1_byte_mar.mar", ["1_byte_file"]);
+    },
+    // Test creating a MAR file with binary data.
+    test_binary_data: function() {
+      return run_one_test(refMARPrefix + "binary_data_mar.mar", 
+                          ["binary_data_file"]);
+    },
+    // Test creating a MAR file with multiple files inside of it.
+    test_multiple_file: function() {
+      return run_one_test(refMARPrefix + "multiple_file_mar.mar", 
+                          ["0_sized_file", "1_byte_file", "binary_data_file"]);
+    },
+    // Test creating a MAR file on top of a different one that already exists
+    // at the location the new one will be created at.
+    test_overwrite_already_exists: function() {
+      let differentFile = do_get_file("data/1_byte_mar.mar");
+      let outMARDir = tempDir.clone();
+      differentFile.copyTo(outMARDir, "out.mar");
+      return run_one_test(refMARPrefix + "binary_data_mar.mar", 
+                          ["binary_data_file"], false);
+    },
+    // Between each test make sure the out MAR does not exist.
+    cleanup_per_test: function() {
+      let outMAR = tempDir.clone();
+      outMAR.append("out.mar");
+      if (outMAR.exists()) {
+        outMAR.remove(false);
+      }
+    }
+  };
+
+  // Run all the tests
+  do_check_eq(run_tests(tests), Object.keys(tests).length - 1);
+}
diff --git a/modules/libmar/tests/unit/test_extract.js b/modules/libmar/tests/unit/test_extract.js
new file mode 100644
index 000000000..49ba80e29
--- /dev/null
+++ b/modules/libmar/tests/unit/test_extract.js
@@ -0,0 +1,93 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function run_test() {
+
+  /**
+   * Extracts a MAR and makes sure each file matches the reference files.
+   *
+   * @param marFileName The name of the MAR file to extract
+   * @param files       The files that the extracted MAR should contain
+  */
+  function run_one_test(marFileName, files) { 
+    // Get the MAR file that we will be extracting
+    let mar = do_get_file("data/" + marFileName);
+
+    // Get the path that we will extract to
+    let outDir = tempDir.clone();
+    outDir.append("out");
+    do_check_false(outDir.exists());
+    outDir.create(Ci.nsIFile.DIRECTORY_TYPE, 0o777);
+
+    // Get the ref files and the files that will be extracted.
+    let outFiles = [];
+    let refFiles = [];
+    for (let i = 0; i < files.length; i++) {
+      let outFile = outDir.clone();
+      outFile.append(files[i]);
+      do_check_false(outFile.exists());
+
+      outFiles.push(outFile);
+      refFiles.push(do_get_file("data/" + files[i]));
+    }
+
+    // Extract the MAR contents into the ./out dir.
+    extractMAR(mar, outDir);
+
+    // Compare to make sure the extracted files are the same.
+    for (let i = 0; i < files.length; i++) {
+      do_check_true(outFiles[i].exists());
+      let refFileData = getBinaryFileData(refFiles[i]);
+      let outFileData = getBinaryFileData(outFiles[i]);
+      compareBinaryData(refFileData, outFileData);
+    }
+  }
+
+  // Define the unit tests to run.
+  let tests = {
+    // Test extracting a MAR file with a 0 byte file.
+    test_zero_sized: function() {
+      return run_one_test("0_sized_mar.mar", ["0_sized_file"]);
+    }, 
+    // Test extracting a MAR file with a 1 byte file.
+    test_one_byte: function() {
+      return run_one_test("1_byte_mar.mar", ["1_byte_file"]);
+    },
+    // Test extracting a MAR file with binary data.
+    test_binary_data: function() {
+      return run_one_test("binary_data_mar.mar", ["binary_data_file"]);
+    },
+    // Test extracting a MAR without a product information block (PIB) which
+    // contains binary data.
+    test_no_pib: function() {
+      return run_one_test("no_pib_mar.mar", ["binary_data_file"]);
+    },
+    // Test extracting a MAR without a product information block (PIB) that is
+    // signed and which contains binary data.
+    test_no_pib_signed: function() {
+      return run_one_test("signed_no_pib_mar.mar", ["binary_data_file"]);
+    },
+    // Test extracting a MAR with a product information block (PIB) that is
+    // signed and which contains binary data.
+    test_pib_signed: function() {
+      return run_one_test("signed_pib_mar.mar", ["binary_data_file"]);
+    },
+    // Test extracting a MAR file with multiple files inside of it.
+    test_multiple_file: function() {
+      return run_one_test("multiple_file_mar.mar", 
+                          ["0_sized_file", "1_byte_file", "binary_data_file"]);
+    }, 
+    // Between each test make sure the out directory and its subfiles do 
+    // not exist.
+    cleanup_per_test: function() {
+      let outDir = tempDir.clone();
+      outDir.append("out");
+      if (outDir.exists()) {
+        outDir.remove(true);
+      }
+    }
+  };
+
+  // Run all the tests
+  do_check_eq(run_tests(tests), Object.keys(tests).length - 1);
+}
diff --git a/modules/libmar/tests/unit/test_sign_verify.js b/modules/libmar/tests/unit/test_sign_verify.js
new file mode 100644
index 000000000..963e489c0
--- /dev/null
+++ b/modules/libmar/tests/unit/test_sign_verify.js
@@ -0,0 +1,575 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function run_test() {
+
+  /**
+   * Signs a MAR file.
+   *
+   * @param inMAR The MAR file that should be signed
+   * @param outMAR The MAR file to create
+  */
+  function signMAR(inMAR, outMAR, certs, wantSuccess, useShortHandCmdLine) {
+    // Get a process to the signmar binary from the dist/bin directory.
+    let process = Cc["@mozilla.org/process/util;1"].
+                  createInstance(Ci.nsIProcess);
+    let signmarBin = do_get_file("signmar" + BIN_SUFFIX);
+
+    // Make sure the signmar binary exists and is an executable.
+    do_check_true(signmarBin.exists());
+    do_check_true(signmarBin.isExecutable());
+
+    // Setup the command line arguments to sign the MAR.
+    let NSSConfigDir = do_get_file("data");
+    let args = ["-d", NSSConfigDir.path];
+    if (certs.length == 1 && useShortHandCmdLine) {
+      args.push("-n", certs[0]);
+    } else {
+      for (var i = 0; i < certs.length; i++) {
+        args.push("-n" + i, certs[i]);
+      }
+    }
+    args.push("-s", inMAR.path, outMAR.path);
+
+    process.init(signmarBin);
+    try {
+      process.run(true, args, args.length);
+    } catch(e) {
+      // On Windows negative return value throws an exception
+      process.exitValue = -1;
+    }
+
+    // Verify signmar returned 0 for success.
+    if (wantSuccess) {
+      do_check_eq(process.exitValue, 0);
+    } else {
+      do_check_neq(process.exitValue, 0);
+    }
+  }
+
+
+  /**
+   * Extract a MAR signature.
+   *
+   * @param inMAR        The MAR file who's signature should be extracted
+   * @param sigIndex     The index of the signature to extract
+   * @param extractedSig The file where the extracted signature will be stored
+   * @param wantSuccess  True if a successful signmar return code is desired
+  */
+  function extractMARSignature(inMAR, sigIndex, extractedSig, wantSuccess) {
+    // Get a process to the signmar binary from the dist/bin directory.
+    let process = Cc["@mozilla.org/process/util;1"].
+                  createInstance(Ci.nsIProcess);
+    let signmarBin = do_get_file("signmar" + BIN_SUFFIX);
+
+    // Make sure the signmar binary exists and is an executable.
+    do_check_true(signmarBin.exists());
+    do_check_true(signmarBin.isExecutable());
+
+    // Setup the command line arguments to extract the signature in the MAR.
+    let args = ["-n" + sigIndex, "-X", inMAR.path, extractedSig.path];
+
+    process.init(signmarBin);
+    try {
+      process.run(true, args, args.length);
+    } catch(e) {
+      // On Windows negative return value throws an exception
+      process.exitValue = -1;
+    }
+
+    // Verify signmar returned 0 for success.
+    if (wantSuccess) {
+      do_check_eq(process.exitValue, 0);
+    } else {
+      do_check_neq(process.exitValue, 0);
+    }
+  }
+
+  /**
+   * Import a MAR signature.
+   *
+   * @param inMAR        The MAR file who's signature should be imported to
+   * @param sigIndex     The index of the signature to import to
+   * @param sigFile      The file where the base64 signature exists
+   * @param outMAR       The same as inMAR but with the specified signature
+   *                     swapped at the specified index.
+   * @param wantSuccess  True if a successful signmar return code is desired
+  */
+  function importMARSignature(inMAR, sigIndex, sigFile, outMAR, wantSuccess) {
+    // Get a process to the signmar binary from the dist/bin directory.
+    let process = Cc["@mozilla.org/process/util;1"].
+                  createInstance(Ci.nsIProcess);
+    let signmarBin = do_get_file("signmar" + BIN_SUFFIX);
+
+    // Make sure the signmar binary exists and is an executable.
+    do_check_true(signmarBin.exists());
+    do_check_true(signmarBin.isExecutable());
+
+    // Setup the command line arguments to import the signature in the MAR.
+    let args = ["-n" + sigIndex, "-I", inMAR.path, sigFile.path, outMAR.path];
+
+    process.init(signmarBin);
+    try {
+      process.run(true, args, args.length);
+    } catch(e) {
+      // On Windows negative return value throws an exception
+      process.exitValue = -1;
+    }
+
+    // Verify signmar returned 0 for success.
+    if (wantSuccess) {
+      do_check_eq(process.exitValue, 0);
+    } else {
+      do_check_neq(process.exitValue, 0);
+    }
+  }
+
+  /**
+   * Verifies a MAR file.
+   *
+   * @param signedMAR Verifies a MAR file
+  */
+  function verifyMAR(signedMAR, wantSuccess, certs, useShortHandCmdLine) {
+    // Get a process to the signmar binary from the dist/bin directory.
+    let process = Cc["@mozilla.org/process/util;1"].
+                  createInstance(Ci.nsIProcess);
+    let signmarBin = do_get_file("signmar" + BIN_SUFFIX);
+
+    // Make sure the signmar binary exists and is an executable.
+    do_check_true(signmarBin.exists());
+    do_check_true(signmarBin.isExecutable());
+
+    // Will reference the arguments to use for verification in signmar
+    let args = [];
+
+    // Setup the command line arguments to create the MAR.
+    // Windows & Mac vs. Linux/... have different command line for verification
+    // since on Windows we verify with CryptoAPI, on Mac with Security
+    // Transforms or CDSA/CSSM and on all other platforms we verify with NSS. So
+    // on Windows and Mac we use an exported DER file and on other platforms we
+    // use the NSS config db.
+    if (mozinfo.os == "win" || mozinfo.os == "mac") {
+      if (certs.length == 1 && useShortHandCmdLine) {
+        args.push("-D", "data/" + certs[0] + ".der");
+      } else {
+        for (var i = 0; i < certs.length; i++) {
+          args.push("-D" + i, "data/" + certs[i] + ".der");
+        }
+      }
+    } else {
+      let NSSConfigDir = do_get_file("data");
+      args = ["-d", NSSConfigDir.path];
+      if (certs.length == 1 && useShortHandCmdLine) {
+        args.push("-n", certs[0]);
+      } else {
+        for (var i = 0; i < certs.length; i++) {
+          args.push("-n" + i, certs[i]);
+        }
+      }
+    }
+    args.push("-v", signedMAR.path);
+
+    process.init(signmarBin);
+    try {
+      // We put this in a try block because nsIProcess doesn't like -1 returns
+      process.run(true, args, args.length);
+    } catch (e) {
+      // On Windows negative return value throws an exception
+      process.exitValue = -1;
+    }
+
+    // Verify signmar returned 0 for success.
+    if (wantSuccess) {
+      do_check_eq(process.exitValue, 0);
+    } else {
+      do_check_neq(process.exitValue, 0);
+    }
+  }
+
+  /**
+   * Strips a MAR signature.
+   *
+   * @param signedMAR The MAR file that should be signed
+   * @param outMAR The MAR file to write to with signature stripped
+  */
+  function stripMARSignature(signedMAR, outMAR, wantSuccess) {
+    // Get a process to the signmar binary from the dist/bin directory.
+    let process = Cc["@mozilla.org/process/util;1"].
+                  createInstance(Ci.nsIProcess);
+    let signmarBin = do_get_file("signmar" + BIN_SUFFIX);
+
+    // Make sure the signmar binary exists and is an executable.
+    do_check_true(signmarBin.exists());
+    do_check_true(signmarBin.isExecutable());
+
+    // Setup the command line arguments to create the MAR.
+    let args = ["-r", signedMAR.path, outMAR.path];
+
+    process.init(signmarBin);
+    try {
+      process.run(true, args, args.length);
+    } catch (e) {
+      // On Windows negative return value throws an exception
+      process.exitValue = -1;
+    }
+
+    // Verify signmar returned 0 for success.
+    if (wantSuccess) {
+      do_check_eq(process.exitValue, 0);
+    } else {
+      do_check_neq(process.exitValue, 0);
+    }
+  }
+
+
+  function cleanup() {
+    let outMAR = tempDir.clone();
+    outMAR.append("signed_out.mar");
+    if (outMAR.exists()) {
+      outMAR.remove(false);
+    }
+    outMAR = tempDir.clone();
+    outMAR.append("multiple_signed_out.mar");
+    if (outMAR.exists()) {
+      outMAR.remove(false);
+    }
+    outMAR = tempDir.clone();
+    outMAR.append("out.mar");
+    if (outMAR.exists()) {
+      outMAR.remove(false);
+    }
+
+    let outDir = tempDir.clone();
+    outDir.append("out");
+    if (outDir.exists()) {
+      outDir.remove(true);
+    }
+  }
+
+  const wantFailure = false;
+  const wantSuccess = true;
+  // Define the unit tests to run.
+  let tests = {
+    // Test signing a MAR file with a single signature
+    test_sign_single: function() {
+      let inMAR = do_get_file("data/" + refMARPrefix + "binary_data_mar.mar");
+      let outMAR = tempDir.clone();
+      outMAR.append("signed_out.mar");
+      if (outMAR.exists()) {
+        outMAR.remove(false);
+      }
+      signMAR(inMAR, outMAR, ["mycert"], wantSuccess, true);
+      do_check_true(outMAR.exists());
+      let outMARData = getBinaryFileData(outMAR);
+      let refMAR = do_get_file("data/" + refMARPrefix + "signed_pib_mar.mar");
+      let refMARData = getBinaryFileData(refMAR);
+      compareBinaryData(outMARData, refMARData);
+    }, 
+    // Test signing a MAR file with multiple signatures
+    test_sign_multiple: function() {
+      let inMAR = do_get_file("data/" + refMARPrefix + "binary_data_mar.mar");
+      let outMAR = tempDir.clone();
+      outMAR.append("multiple_signed_out.mar");
+      if (outMAR.exists()) {
+        outMAR.remove(false);
+      }
+      do_check_false(outMAR.exists());
+      signMAR(inMAR, outMAR, ["mycert", "mycert2", "mycert3"],
+              wantSuccess, true);
+      do_check_true(outMAR.exists());
+      let outMARData = getBinaryFileData(outMAR);
+      let refMAR = do_get_file("data/" + refMARPrefix + "multiple_signed_pib_mar.mar");
+      let refMARData = getBinaryFileData(refMAR);
+      compareBinaryData(outMARData, refMARData);
+    },
+    // Test verifying a signed MAR file
+    test_verify_single: function() {
+      let signedMAR = do_get_file("data/signed_pib_mar.mar");
+      verifyMAR(signedMAR, wantSuccess, ["mycert"], true);
+      verifyMAR(signedMAR, wantSuccess, ["mycert"], false);
+    }, 
+    // Test verifying a signed MAR file with too many certs fails.
+    // Or if you want to look at it another way, One mycert signature
+    // is missing.
+    test_verify_single_too_many_certs: function() {
+      let signedMAR = do_get_file("data/signed_pib_mar.mar");
+      verifyMAR(signedMAR, wantFailure, ["mycert", "mycert"], true);
+      verifyMAR(signedMAR, wantFailure, ["mycert", "mycert"], false);
+    },
+    // Test verifying a signed MAR file fails when using a wrong cert
+    test_verify_single_wrong_cert: function() {
+      let signedMAR = do_get_file("data/signed_pib_mar.mar");
+      verifyMAR(signedMAR, wantFailure, ["mycert2"], true);
+      verifyMAR(signedMAR, wantFailure, ["mycert2"], false);
+    },
+    // Test verifying a signed MAR file with multiple signatures
+    test_verify_multiple: function() {
+      let signedMAR = do_get_file("data/multiple_signed_pib_mar.mar");
+      verifyMAR(signedMAR, wantSuccess, ["mycert", "mycert2", "mycert3"]);
+    },
+    // Test verifying an unsigned MAR file fails
+    test_verify_unsigned_mar_file_fails: function() {
+      let unsignedMAR = do_get_file("data/binary_data_mar.mar");
+      verifyMAR(unsignedMAR, wantFailure, ["mycert", "mycert2", "mycert3"]);
+    },
+    // Test verifying a signed MAR file with the same signature multiple
+    // times fails.  The input MAR has: mycert, mycert2, mycert3.
+    // we're checking to make sure the number of verified signatures
+    // is only 1 and not 3.  Each signature should be verified once.
+    test_verify_multiple_same_cert: function() {
+      let signedMAR = do_get_file("data/multiple_signed_pib_mar.mar");
+      verifyMAR(signedMAR, wantFailure, ["mycert", "mycert", "mycert"]);
+    },
+    // Test verifying a signed MAR file with the correct signatures but in
+    // a different order fails
+    test_verify_multiple_wrong_order: function() {
+      let signedMAR = do_get_file("data/multiple_signed_pib_mar.mar");
+      verifyMAR(signedMAR, wantSuccess, ["mycert", "mycert2", "mycert3"]);
+      verifyMAR(signedMAR, wantFailure, ["mycert", "mycert3", "mycert2"]);
+      verifyMAR(signedMAR, wantFailure, ["mycert2", "mycert", "mycert3"]);
+      verifyMAR(signedMAR, wantFailure, ["mycert2", "mycert3", "mycert"]);
+      verifyMAR(signedMAR, wantFailure, ["mycert3", "mycert", "mycert2"]);
+      verifyMAR(signedMAR, wantFailure, ["mycert3", "mycert2", "mycert"]);
+    },
+    // Test verifying a signed MAR file without a PIB
+    test_verify_no_pib: function() {
+      let signedMAR = do_get_file("data/signed_no_pib_mar.mar");
+      verifyMAR(signedMAR, wantSuccess, ["mycert"], true);
+      verifyMAR(signedMAR, wantSuccess, ["mycert"], false);
+    }, 
+    // Test verifying a signed MAR file with multiple signatures without a PIB
+    test_verify_no_pib_multiple: function() {
+      let signedMAR = do_get_file("data/multiple_signed_no_pib_mar.mar");
+      verifyMAR(signedMAR, wantSuccess, ["mycert", "mycert2", "mycert3"]);
+    },
+    // Test verifying a crafted MAR file where the attacker tried to adjust
+    // the version number manually.
+    test_crafted_mar: function() {
+      let signedBadMAR = do_get_file("data/manipulated_signed_mar.mar");
+      verifyMAR(signedBadMAR, wantFailure, ["mycert"], true);
+      verifyMAR(signedBadMAR, wantFailure, ["mycert"], false);
+    }, 
+    // Test verifying a file that doesn't exist fails
+    test_bad_path_verify_fails: function() {
+      let noMAR = do_get_file("data/does_not_exist_.mar", true);
+      do_check_false(noMAR.exists());
+      verifyMAR(noMAR, wantFailure, ["mycert"], true);
+    },
+    // Test to make sure a stripped MAR is the same as the original MAR
+    test_strip_signature: function() {
+      let originalMAR = do_get_file("data/" + 
+                                    refMARPrefix + 
+                                    "binary_data_mar.mar");
+      let signedMAR = tempDir.clone();
+      signedMAR.append("signed_out.mar");
+      let outMAR = tempDir.clone();
+      outMAR.append("out.mar", true);
+      stripMARSignature(signedMAR, outMAR, wantSuccess);
+
+      // Verify that the stripped MAR matches the original data MAR exactly
+      let outMARData = getBinaryFileData(outMAR);
+      let originalMARData = getBinaryFileData(originalMAR);
+      compareBinaryData(outMARData, originalMARData);
+    },
+    // Test to make sure a stripped multi-signature-MAR is the same as the original MAR
+    test_strip_multiple_signatures: function() {
+      let originalMAR = do_get_file("data/" +
+                                    refMARPrefix +
+                                    "binary_data_mar.mar");
+      let signedMAR = tempDir.clone();
+      signedMAR.append("multiple_signed_out.mar");
+      let outMAR = tempDir.clone();
+      outMAR.append("out.mar");
+      stripMARSignature(signedMAR, outMAR, wantSuccess);
+
+      // Verify that the stripped MAR matches the original data MAR exactly
+      let outMARData = getBinaryFileData(outMAR);
+      let originalMARData = getBinaryFileData(originalMAR);
+      compareBinaryData(outMARData, originalMARData);
+    },
+    // Test extracting the first signature in a MAR that has only a single signature
+    test_extract_sig_single: function() {
+      let inMAR = do_get_file("data/signed_pib_mar.mar");
+      let extractedSig = do_get_file("extracted_signature", true);
+      if (extractedSig.exists()) {
+        extractedSig.remove(false);
+      }
+      extractMARSignature(inMAR, 0, extractedSig, wantSuccess);
+      do_check_true(extractedSig.exists());
+
+      let referenceSig = do_get_file("data/signed_pib_mar.signature.0"); +
+      compareBinaryData(extractedSig, referenceSig);
+    },
+    // Test extracting the all signatures in a multi signature MAR
+    // The input MAR has 3 signatures.
+    test_extract_sig_multi: function() {
+      for (let i = 0; i < 3; i++) {
+        let inMAR = do_get_file("data/multiple_signed_pib_mar.mar");
+        let extractedSig = do_get_file("extracted_signature", true);
+        if (extractedSig.exists()) {
+          extractedSig.remove(false);
+        }
+        extractMARSignature(inMAR, i, extractedSig, wantSuccess);
+        do_check_true(extractedSig.exists());
+
+        let referenceSig = do_get_file("data/multiple_signed_pib_mar.sig." + i); +
+        compareBinaryData(extractedSig, referenceSig);
+      }
+    },
+    // Test extracting a signature that is out of range fails
+    test_extract_sig_out_of_range: function() {
+      let inMAR = do_get_file("data/signed_pib_mar.mar");
+      let extractedSig = do_get_file("extracted_signature", true);
+      if (extractedSig.exists()) {
+        extractedSig.remove(false);
+      }
+      const outOfBoundsIndex = 5;
+      extractMARSignature(inMAR, outOfBoundsIndex, extractedSig, wantFailure);
+      do_check_false(extractedSig.exists());
+    },
+    // Test signing a file that doesn't exist fails
+    test_bad_path_sign_fails: function() {
+      let inMAR = do_get_file("data/does_not_exist_.mar", true);
+      let outMAR = tempDir.clone();
+      outMAR.append("signed_out.mar");
+      do_check_false(inMAR.exists());
+      signMAR(inMAR, outMAR, ["mycert"], wantFailure, true);
+      do_check_false(outMAR.exists());
+    },
+    // Test verifying only a subset of the signatures fails.
+    // The input MAR has: mycert, mycert2, mycert3.
+    // We're only verifying 2 of the 3 signatures and that should fail.
+    test_verify_multiple_subset: function() {
+      let signedMAR = do_get_file("data/multiple_signed_pib_mar.mar");
+      verifyMAR(signedMAR, wantFailure, ["mycert", "mycert2"]);
+    },
+    // Test importing the first signature in a MAR that has only
+    // a single signature
+    test_import_sig_single: function() {
+      // Make sure the input MAR was signed with mycert only
+      let inMAR = do_get_file("data/signed_pib_mar.mar");
+      verifyMAR(inMAR, wantSuccess, ["mycert"], false);
+      verifyMAR(inMAR, wantFailure, ["mycert2"], false);
+      verifyMAR(inMAR, wantFailure, ["mycert3"], false);
+
+      // Get the signature file for this MAR signed with the key from mycert2
+      let sigFile = do_get_file("data/signed_pib_mar.signature.mycert2");
+      do_check_true(sigFile.exists());
+      let outMAR = tempDir.clone();
+      outMAR.append("sigchanged_signed_pib_mar.mar");
+      if (outMAR.exists()) {
+        outMAR.remove(false);
+      }
+
+      //Run the import operation
+      importMARSignature(inMAR, 0, sigFile, outMAR, wantSuccess);
+
+      // Verify we have a new MAR file and that mycert no longer verifies
+      // and that mycert2 does verify
+      do_check_true(outMAR.exists());
+      verifyMAR(outMAR, wantFailure, ["mycert"], false);
+      verifyMAR(outMAR, wantSuccess, ["mycert2"], false);
+      verifyMAR(outMAR, wantFailure, ["mycert3"], false);
+
+      // Compare the binary data to something that was signed originally
+      // with the private key from mycert2
+      let refMAR = do_get_file("data/signed_pib_mar_with_mycert2.mar");
+      do_check_true(refMAR.exists());
+      let refMARData = getBinaryFileData(refMAR);
+      let outMARData = getBinaryFileData(outMAR);
+      compareBinaryData(outMARData, refMARData);
+    },
+    // Test importing a signature that doesn't belong to the file
+    // fails to verify.
+    test_import_wrong_sig: function() {
+      // Make sure the input MAR was signed with mycert only
+      let inMAR = do_get_file("data/signed_pib_mar.mar");
+      verifyMAR(inMAR, wantSuccess, ["mycert"], false);
+      verifyMAR(inMAR, wantFailure, ["mycert2"], false);
+      verifyMAR(inMAR, wantFailure, ["mycert3"], false);
+
+      // Get the signature file for this MAR signed with the key from mycert2
+      let sigFile = do_get_file("data/multiple_signed_pib_mar.sig.0");
+      do_check_true(sigFile.exists());
+      let outMAR = tempDir.clone();
+      outMAR.append("sigchanged_signed_pib_mar.mar");
+      if (outMAR.exists()) {
+        outMAR.remove(false);
+      }
+
+      //Run the import operation
+      importMARSignature(inMAR, 0, sigFile, outMAR, wantSuccess);
+
+      // Verify we have a new MAR file and that mycert no longer verifies
+      // and that mycert2 does verify
+      do_check_true(outMAR.exists());
+      verifyMAR(outMAR, wantFailure, ["mycert"], false);
+      verifyMAR(outMAR, wantFailure, ["mycert2"], false);
+      verifyMAR(outMAR, wantFailure, ["mycert3"], false);
+    },
+    // Test importing to the second signature in a MAR that has multiple
+    // signature
+    test_import_sig_multiple: function() {
+      // Make sure the input MAR was signed with mycert only
+      let inMAR = do_get_file("data/multiple_signed_pib_mar.mar");
+      verifyMAR(inMAR, wantSuccess, ["mycert", "mycert2", "mycert3"], false);
+      verifyMAR(inMAR, wantFailure, ["mycert", "mycert", "mycert3"], false);
+
+      // Get the signature file for this MAR signed with the key from mycert
+      let sigFile = do_get_file("data/multiple_signed_pib_mar.sig.0");
+      do_check_true(sigFile.exists());
+      let outMAR = tempDir.clone();
+      outMAR.append("sigchanged_signed_pib_mar.mar");
+      if (outMAR.exists()) {
+        outMAR.remove(false);
+      }
+
+      //Run the import operation
+      const secondSigPos = 1;
+      importMARSignature(inMAR, secondSigPos, sigFile, outMAR, wantSuccess);
+
+      // Verify we have a new MAR file and that mycert no longer verifies
+      // and that mycert2 does verify
+      do_check_true(outMAR.exists());
+      verifyMAR(outMAR, wantSuccess, ["mycert", "mycert", "mycert3"], false);
+      verifyMAR(outMAR, wantFailure, ["mycert", "mycert2", "mycert3"], false);
+
+      // Compare the binary data to something that was signed originally
+      // with the private keys from mycert, mycert, mycert3
+      let refMAR = do_get_file("data/multiple_signed_pib_mar_2.mar");
+      do_check_true(refMAR.exists());
+      let refMARData = getBinaryFileData(refMAR);
+      let outMARData = getBinaryFileData(outMAR);
+      compareBinaryData(outMARData, refMARData);
+    },
+    // Test stripping a MAR that doesn't exist fails 
+    test_bad_path_strip_fails: function() {
+      let noMAR = do_get_file("data/does_not_exist_mar", true);
+      do_check_false(noMAR.exists());
+      let outMAR = tempDir.clone();
+      outMAR.append("out.mar");
+      stripMARSignature(noMAR, outMAR, wantFailure);
+    },
+    // Test extracting from a bad path fails
+    test_extract_bad_path: function() {
+      let noMAR = do_get_file("data/does_not_exist.mar", true);
+      let extractedSig = do_get_file("extracted_signature", true);
+      do_check_false(noMAR.exists());
+      if (extractedSig.exists()) {
+        extractedSig.remove(false);
+      }
+      extractMARSignature(noMAR, 0, extractedSig, wantFailure);
+      do_check_false(extractedSig.exists());
+    },
+    // Between each test make sure the out MAR does not exist.
+    cleanup_per_test: function() {
+    }
+  };
+
+  cleanup();
+
+  // Run all the tests
+  do_check_eq(run_tests(tests), Object.keys(tests).length - 1);
+
+  do_register_cleanup(cleanup);
+}
diff --git a/modules/libmar/tests/unit/xpcshell.ini b/modules/libmar/tests/unit/xpcshell.ini
new file mode 100644
index 000000000..f8f9a700c
--- /dev/null
+++ b/modules/libmar/tests/unit/xpcshell.ini
@@ -0,0 +1,8 @@
+[DEFAULT]
+head = head_libmar.js
+tail =
+support-files = data/**
+
+[test_create.js]
+[test_extract.js]
+[test_sign_verify.js]
diff --git a/modules/libmar/tool/mar.c b/modules/libmar/tool/mar.c
new file mode 100644
index 000000000..f1dd76136
--- /dev/null
+++ b/modules/libmar/tool/mar.c
@@ -0,0 +1,426 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "mar.h"
+#include "mar_cmdline.h"
+
+#ifdef XP_WIN
+#include <windows.h>
+#include <direct.h>
+#define chdir _chdir
+#else
+#include <unistd.h>
+#endif
+
+#if !defined(NO_SIGN_VERIFY) && (!defined(XP_WIN) || defined(MAR_NSS))
+#include "cert.h"
+#include "nss.h"
+#include "pk11pub.h"
+int NSSInitCryptoContext(const char *NSSConfigDir);
+#endif
+
+int mar_repackage_and_sign(const char *NSSConfigDir,
+                           const char * const *certNames,
+                           uint32_t certCount,
+                           const char *src, 
+                           const char * dest);
+
+static void print_version() {
+  printf("Version: %s\n", MOZ_APP_VERSION);
+  printf("Default Channel ID: %s\n", MAR_CHANNEL_ID);
+}
+
+static void print_usage() {
+  printf("usage:\n");
+  printf("Create a MAR file:\n");
+  printf("  mar [-H MARChannelID] [-V ProductVersion] [-C workingDir] "
+         "-c archive.mar [files...]\n");
+
+  printf("Extract a MAR file:\n");
+  printf("  mar [-C workingDir] -x archive.mar\n");
+#ifndef NO_SIGN_VERIFY
+  printf("Sign a MAR file:\n");
+  printf("  mar [-C workingDir] -d NSSConfigDir -n certname -s "
+         "archive.mar out_signed_archive.mar\n");
+
+  printf("Strip a MAR signature:\n");
+  printf("  mar [-C workingDir] -r "
+         "signed_input_archive.mar output_archive.mar\n");
+
+  printf("Extract a MAR signature:\n");
+  printf("  mar [-C workingDir] -n(i) -X "
+         "signed_input_archive.mar base_64_encoded_signature_file\n");
+
+  printf("Import a MAR signature:\n");
+  printf("  mar [-C workingDir] -n(i) -I "
+         "signed_input_archive.mar base_64_encoded_signature_file "
+         "changed_signed_output.mar\n");
+  printf("(i) is the index of the certificate to extract\n");
+#if defined(XP_MACOSX) || (defined(XP_WIN) && !defined(MAR_NSS))
+  printf("Verify a MAR file:\n");
+  printf("  mar [-C workingDir] -D DERFilePath -v signed_archive.mar\n");
+  printf("At most %d signature certificate DER files are specified by "
+         "-D0 DERFilePath1 -D1 DERFilePath2, ...\n", MAX_SIGNATURES);
+#else
+  printf("Verify a MAR file:\n");
+  printf("  mar [-C workingDir] -d NSSConfigDir -n certname "
+         "-v signed_archive.mar\n");
+  printf("At most %d signature certificate names are specified by "
+         "-n0 certName -n1 certName2, ...\n", MAX_SIGNATURES);
+#endif
+  printf("At most %d verification certificate names are specified by "
+         "-n0 certName -n1 certName2, ...\n", MAX_SIGNATURES);
+#endif
+  printf("Print information on a MAR file:\n");
+  printf("  mar -t archive.mar\n");
+
+  printf("Print detailed information on a MAR file including signatures:\n");
+  printf("  mar -T archive.mar\n");
+
+  printf("Refresh the product information block of a MAR file:\n");
+  printf("  mar [-H MARChannelID] [-V ProductVersion] [-C workingDir] "
+         "-i unsigned_archive_to_refresh.mar\n");
+
+  printf("Print executable version:\n");
+  printf("  mar --version\n");
+  printf("This program does not handle unicode file paths properly\n");
+}
+
+static int mar_test_callback(MarFile *mar, 
+                             const MarItem *item, 
+                             void *unused) {
+  printf("%u\t0%o\t%s\n", item->length, item->flags, item->name);
+  return 0;
+}
+
+static int mar_test(const char *path) {
+  MarFile *mar;
+
+  mar = mar_open(path);
+  if (!mar)
+    return -1;
+
+  printf("SIZE\tMODE\tNAME\n");
+  mar_enum_items(mar, mar_test_callback, NULL);
+
+  mar_close(mar);
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  char *NSSConfigDir = NULL;
+  const char *certNames[MAX_SIGNATURES];
+  char *MARChannelID = MAR_CHANNEL_ID;
+  char *productVersion = MOZ_APP_VERSION;
+  uint32_t k;
+  int rv = -1;
+  uint32_t certCount = 0;
+  int32_t sigIndex = -1;
+
+#if !defined(NO_SIGN_VERIFY)
+  uint32_t fileSizes[MAX_SIGNATURES];
+  const uint8_t* certBuffers[MAX_SIGNATURES];
+#if ((!defined(MAR_NSS) && defined(XP_WIN)) || defined(XP_MACOSX)) || \
+    ((defined(XP_WIN) || defined(XP_MACOSX)) && !defined(MAR_NSS))
+  char* DERFilePaths[MAX_SIGNATURES];
+#endif
+#if (!defined(XP_WIN) && !defined(XP_MACOSX)) || defined(MAR_NSS)
+  CERTCertificate* certs[MAX_SIGNATURES];
+#endif
+#endif
+
+  memset((void*)certNames, 0, sizeof(certNames));
+#if defined(XP_WIN) && !defined(MAR_NSS) && !defined(NO_SIGN_VERIFY)
+  memset((void*)certBuffers, 0, sizeof(certBuffers));
+#endif
+#if !defined(NO_SIGN_VERIFY) && ((!defined(MAR_NSS) && defined(XP_WIN)) || \
+                                 defined(XP_MACOSX))
+  memset(DERFilePaths, 0, sizeof(DERFilePaths));
+  memset(fileSizes, 0, sizeof(fileSizes));
+#endif
+
+  if (argc > 1 && 0 == strcmp(argv[1], "--version")) {
+    print_version();
+    return 0;
+  }
+
+  if (argc < 3) {
+    print_usage();
+    return -1;
+  }
+
+  while (argc > 0) {
+    if (argv[1][0] == '-' && (argv[1][1] == 'c' || 
+        argv[1][1] == 't' || argv[1][1] == 'x' || 
+        argv[1][1] == 'v' || argv[1][1] == 's' ||
+        argv[1][1] == 'i' || argv[1][1] == 'T' ||
+        argv[1][1] == 'r' || argv[1][1] == 'X' ||
+        argv[1][1] == 'I')) {
+      break;
+    /* -C workingdirectory */
+    } else if (argv[1][0] == '-' && argv[1][1] == 'C') {
+      if (chdir(argv[2]) != 0) {
+        return -1;
+      }
+      argv += 2;
+      argc -= 2;
+    } 
+#if !defined(NO_SIGN_VERIFY) && ((!defined(MAR_NSS) && defined(XP_WIN)) || \
+                                 defined(XP_MACOSX))
+    /* -D DERFilePath, also matches -D[index] DERFilePath
+       We allow an index for verifying to be symmetric
+       with the import and export command line arguments. */
+    else if (argv[1][0] == '-' &&
+             argv[1][1] == 'D' &&
+             (argv[1][2] == (char)('0' + certCount) || argv[1][2] == '\0')) {
+      if (certCount >= MAX_SIGNATURES) {
+        print_usage();
+        return -1;
+      }
+      DERFilePaths[certCount++] = argv[2];
+      argv += 2;
+      argc -= 2;
+    }
+#endif
+    /* -d NSSConfigdir */
+    else if (argv[1][0] == '-' && argv[1][1] == 'd') {
+      NSSConfigDir = argv[2];
+      argv += 2;
+      argc -= 2;
+     /* -n certName, also matches -n[index] certName
+        We allow an index for verifying to be symmetric
+        with the import and export command line arguments. */
+    } else if (argv[1][0] == '-' &&
+               argv[1][1] == 'n' &&
+               (argv[1][2] == (char)('0' + certCount) ||
+                argv[1][2] == '\0' ||
+                !strcmp(argv[2], "-X") ||
+                !strcmp(argv[2], "-I"))) {
+      if (certCount >= MAX_SIGNATURES) {
+        print_usage();
+        return -1;
+      }
+      certNames[certCount++] = argv[2];
+      if (strlen(argv[1]) > 2 &&
+          (!strcmp(argv[2], "-X") || !strcmp(argv[2], "-I")) &&
+          argv[1][2] >= '0' && argv[1][2] <= '9') {
+        sigIndex = argv[1][2] - '0';
+        argv++;
+        argc--;
+      } else {
+        argv += 2;
+        argc -= 2;
+      }
+    /* MAR channel ID */
+    } else if (argv[1][0] == '-' && argv[1][1] == 'H') {
+      MARChannelID = argv[2];
+      argv += 2;
+      argc -= 2;
+    /* Product Version */
+    } else if (argv[1][0] == '-' && argv[1][1] == 'V') {
+      productVersion = argv[2];
+      argv += 2;
+      argc -= 2;
+    }
+    else {
+      print_usage();
+      return -1;
+    }
+  }
+
+  if (argv[1][0] != '-') {
+    print_usage();
+    return -1;
+  }
+
+  switch (argv[1][1]) {
+  case 'c': {
+    struct ProductInformationBlock infoBlock;
+    infoBlock.MARChannelID = MARChannelID;
+    infoBlock.productVersion = productVersion;
+    return mar_create(argv[2], argc - 3, argv + 3, &infoBlock);
+  }
+  case 'i': {
+    struct ProductInformationBlock infoBlock;
+    infoBlock.MARChannelID = MARChannelID;
+    infoBlock.productVersion = productVersion;
+    return refresh_product_info_block(argv[2], &infoBlock);
+  }
+  case 'T': {
+    struct ProductInformationBlock infoBlock;
+    uint32_t numSignatures, numAdditionalBlocks;
+    int hasSignatureBlock, hasAdditionalBlock;
+    if (!get_mar_file_info(argv[2], 
+                           &hasSignatureBlock,
+                           &numSignatures,
+                           &hasAdditionalBlock, 
+                           NULL, &numAdditionalBlocks)) {
+      if (hasSignatureBlock) {
+        printf("Signature block found with %d signature%s\n", 
+               numSignatures, 
+               numSignatures != 1 ? "s" : "");
+      }
+      if (hasAdditionalBlock) {
+        printf("%d additional block%s found:\n", 
+               numAdditionalBlocks,
+               numAdditionalBlocks != 1 ? "s" : "");
+      }
+
+      rv = read_product_info_block(argv[2], &infoBlock);
+      if (!rv) {
+        printf("  - Product Information Block:\n");
+        printf("    - MAR channel name: %s\n"
+               "    - Product version: %s\n",
+               infoBlock.MARChannelID,
+               infoBlock.productVersion);
+        free((void *)infoBlock.MARChannelID);
+        free((void *)infoBlock.productVersion);
+      }
+     }
+    printf("\n");
+    /* The fall through from 'T' to 't' is intentional */
+  }
+  case 't':
+    return mar_test(argv[2]);
+
+  /* Extract a MAR file */
+  case 'x':
+    return mar_extract(argv[2]);
+
+#ifndef NO_SIGN_VERIFY
+  /* Extract a MAR signature */
+  case 'X':
+    if (sigIndex == -1) {
+      fprintf(stderr, "ERROR: Signature index was not passed.\n");
+      return -1;
+    }
+    if (sigIndex >= MAX_SIGNATURES || sigIndex < -1) {
+      fprintf(stderr, "ERROR: Signature index is out of range: %d.\n",
+              sigIndex);
+      return -1;
+    }
+    return extract_signature(argv[2], sigIndex, argv[3]);
+
+  /* Import a MAR signature */
+  case 'I':
+    if (sigIndex == -1) {
+      fprintf(stderr, "ERROR: signature index was not passed.\n");
+      return -1;
+    }
+    if (sigIndex >= MAX_SIGNATURES || sigIndex < -1) {
+      fprintf(stderr, "ERROR: Signature index is out of range: %d.\n",
+              sigIndex);
+      return -1;
+    }
+    if (argc < 5) {
+      print_usage();
+      return -1;
+    }
+    return import_signature(argv[2], sigIndex, argv[3], argv[4]);
+
+  case 'v':
+    if (certCount == 0) {
+      print_usage();
+      return -1;
+    }
+
+#if (!defined(XP_WIN) && !defined(XP_MACOSX)) || defined(MAR_NSS)
+    if (!NSSConfigDir || certCount == 0) {
+      print_usage();
+      return -1;
+    }
+
+    if (NSSInitCryptoContext(NSSConfigDir)) {
+      fprintf(stderr, "ERROR: Could not initialize crypto library.\n");
+      return -1;
+    }
+#endif
+
+    rv = 0;
+    for (k = 0; k < certCount; ++k) {
+#if (defined(XP_WIN) || defined(XP_MACOSX)) && !defined(MAR_NSS)
+      rv = mar_read_entire_file(DERFilePaths[k], MAR_MAX_CERT_SIZE,
+                                &certBuffers[k], &fileSizes[k]);
+
+      if (rv) {
+        fprintf(stderr, "ERROR: could not read file %s", DERFilePaths[k]);
+        break;
+      }
+#else
+      /* It is somewhat circuitous to look up a CERTCertificate and then pass
+       * in its DER encoding just so we can later re-create that
+       * CERTCertificate to extract the public key out of it. However, by doing
+       * things this way, we maximize the reuse of the mar_verify_signatures
+       * function and also we keep the control flow as similar as possible
+       * between programs and operating systems, at least for the functions
+       * that are critically important to security.
+       */
+      certs[k] = PK11_FindCertFromNickname(certNames[k], NULL);
+      if (certs[k]) {
+        certBuffers[k] = certs[k]->derCert.data;
+        fileSizes[k] = certs[k]->derCert.len;
+      } else {
+        rv = -1;
+        fprintf(stderr, "ERROR: could not find cert from nickname %s", certNames[k]);
+        break;
+      }
+#endif
+    }
+
+    if (!rv) {
+      MarFile *mar = mar_open(argv[2]);
+      if (mar) {
+        rv = mar_verify_signatures(mar, certBuffers, fileSizes, certCount);
+        mar_close(mar);
+      } else {
+        fprintf(stderr, "ERROR: Could not open MAR file.\n");
+        rv = -1;
+      }
+    }
+    for (k = 0; k < certCount; ++k) {
+#if (defined(XP_WIN) || defined(XP_MACOSX)) && !defined(MAR_NSS)
+      free((void*)certBuffers[k]);
+#else
+      /* certBuffers[k] is owned by certs[k] so don't free it */
+      CERT_DestroyCertificate(certs[k]);
+#endif
+    }
+    if (rv) {
+      /* Determine if the source MAR file has the new fields for signing */
+      int hasSignatureBlock;
+      if (get_mar_file_info(argv[2], &hasSignatureBlock, 
+                            NULL, NULL, NULL, NULL)) {
+        fprintf(stderr, "ERROR: could not determine if MAR is old or new.\n");
+      } else if (!hasSignatureBlock) {
+        fprintf(stderr, "ERROR: The MAR file is in the old format so has"
+                        " no signature to verify.\n");
+      }
+    }
+#if (!defined(XP_WIN) && !defined(XP_MACOSX)) || defined(MAR_NSS)
+    (void) NSS_Shutdown();
+#endif
+    return rv ? -1 : 0;
+
+  case 's':
+    if (!NSSConfigDir || certCount == 0 || argc < 4) {
+      print_usage();
+      return -1;
+    }
+    return mar_repackage_and_sign(NSSConfigDir, certNames, certCount,
+                                  argv[2], argv[3]);
+
+  case 'r':
+    return strip_signature_block(argv[2], argv[3]);
+#endif /* endif NO_SIGN_VERIFY disabled */
+
+  default:
+    print_usage();
+    return -1;
+  }
+}
diff --git a/modules/libmar/tool/moz.build b/modules/libmar/tool/moz.build
new file mode 100644
index 000000000..05f31d918
--- /dev/null
+++ b/modules/libmar/tool/moz.build
@@ -0,0 +1,61 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+HOST_SOURCES += [
+    'mar.c',
+]
+
+HostProgram('mar')
+
+HOST_USE_LIBS += [
+    'hostmar',
+]
+
+if CONFIG['MOZ_ENABLE_SIGNMAR']:
+    Program('signmar')
+
+    SOURCES += HOST_SOURCES
+
+    USE_LIBS += [
+        'mar',
+        'signmar',
+        'verifymar',
+    ]
+
+for var in ('MAR_CHANNEL_ID', 'MOZ_APP_VERSION'):
+    DEFINES[var] = '"%s"' % CONFIG[var]
+    HOST_DEFINES[var] = DEFINES[var]
+
+if CONFIG['MOZ_ENABLE_SIGNMAR']:
+    USE_LIBS += [
+        'nspr',
+        'nss',
+    ]
+else:
+    DEFINES['NO_SIGN_VERIFY'] = True
+
+if CONFIG['OS_ARCH'] == 'WINNT':
+    USE_STATIC_LIBS = True
+
+    OS_LIBS += [
+        'ws2_32',
+    ]
+    if CONFIG['MOZ_ENABLE_SIGNMAR']:
+        OS_LIBS += [
+            'crypt32',
+            'advapi32',
+        ]
+elif CONFIG['OS_ARCH'] == 'Darwin':
+    OS_LIBS += [
+      '-framework Security',
+    ]
+
+if CONFIG['HOST_OS_ARCH'] == 'WINNT':
+    HOST_OS_LIBS += [
+        'ws2_32',
+    ]
+
+HOST_DEFINES['NO_SIGN_VERIFY'] = True
diff --git a/modules/libmar/verify/MacVerifyCrypto.cpp b/modules/libmar/verify/MacVerifyCrypto.cpp
new file mode 100644
index 000000000..16c9028cf
--- /dev/null
+++ b/modules/libmar/verify/MacVerifyCrypto.cpp
@@ -0,0 +1,213 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <Security/Security.h>
+#include <dlfcn.h>
+
+#include "cryptox.h"
+
+// We declare the necessary parts of the Security Transforms API here since
+// we're building with the 10.6 SDK, which doesn't know about Security
+// Transforms.
+#ifdef __cplusplus
+extern "C" {
+#endif
+  const CFStringRef kSecTransformInputAttributeName = CFSTR("INPUT");
+  typedef CFTypeRef SecTransformRef;
+  typedef struct OpaqueSecKeyRef* SecKeyRef;
+
+  typedef SecTransformRef (*SecTransformCreateReadTransformWithReadStreamFunc)
+                            (CFReadStreamRef inputStream);
+  SecTransformCreateReadTransformWithReadStreamFunc
+    SecTransformCreateReadTransformWithReadStreamPtr = NULL;
+  typedef CFTypeRef (*SecTransformExecuteFunc)(SecTransformRef transform,
+                                               CFErrorRef* error);
+  SecTransformExecuteFunc SecTransformExecutePtr = NULL;
+  typedef SecTransformRef (*SecVerifyTransformCreateFunc)(SecKeyRef key,
+                                                          CFDataRef signature,
+                                                          CFErrorRef* error);
+  SecVerifyTransformCreateFunc SecVerifyTransformCreatePtr = NULL;
+  typedef Boolean (*SecTransformSetAttributeFunc)(SecTransformRef transform,
+                                                  CFStringRef key,
+                                                  CFTypeRef value,
+                                                  CFErrorRef* error);
+  SecTransformSetAttributeFunc SecTransformSetAttributePtr = NULL;
+#ifdef __cplusplus
+}
+#endif
+
+CryptoX_Result
+CryptoMac_InitCryptoProvider()
+{
+  if (!SecTransformCreateReadTransformWithReadStreamPtr) {
+    SecTransformCreateReadTransformWithReadStreamPtr =
+      (SecTransformCreateReadTransformWithReadStreamFunc)
+        dlsym(RTLD_DEFAULT, "SecTransformCreateReadTransformWithReadStream");
+  }
+  if (!SecTransformExecutePtr) {
+    SecTransformExecutePtr = (SecTransformExecuteFunc)
+      dlsym(RTLD_DEFAULT, "SecTransformExecute");
+  }
+  if (!SecVerifyTransformCreatePtr) {
+    SecVerifyTransformCreatePtr = (SecVerifyTransformCreateFunc)
+      dlsym(RTLD_DEFAULT, "SecVerifyTransformCreate");
+  }
+  if (!SecTransformSetAttributePtr) {
+    SecTransformSetAttributePtr = (SecTransformSetAttributeFunc)
+      dlsym(RTLD_DEFAULT, "SecTransformSetAttribute");
+  }
+  if (!SecTransformCreateReadTransformWithReadStreamPtr ||
+      !SecTransformExecutePtr ||
+      !SecVerifyTransformCreatePtr ||
+      !SecTransformSetAttributePtr) {
+    return CryptoX_Error;
+  }
+  return CryptoX_Success;
+}
+
+CryptoX_Result
+CryptoMac_VerifyBegin(CryptoX_SignatureHandle* aInputData)
+{
+  if (!aInputData) {
+    return CryptoX_Error;
+  }
+
+  void* inputData = CFDataCreateMutable(kCFAllocatorDefault, 0);
+  if (!inputData) {
+    return CryptoX_Error;
+  }
+
+  *aInputData = inputData;
+  return CryptoX_Success;
+}
+
+CryptoX_Result
+CryptoMac_VerifyUpdate(CryptoX_SignatureHandle* aInputData, void* aBuf,
+                       unsigned int aLen)
+{
+  if (aLen == 0) {
+    return CryptoX_Success;
+  }
+  if (!aInputData || !*aInputData) {
+    return CryptoX_Error;
+  }
+
+  CFMutableDataRef inputData = (CFMutableDataRef)*aInputData;
+
+  CFDataAppendBytes(inputData, (const uint8*)aBuf, aLen);
+  return CryptoX_Success;
+}
+
+CryptoX_Result
+CryptoMac_LoadPublicKey(const unsigned char* aCertData,
+                        unsigned int aDataSize,
+                        CryptoX_PublicKey* aPublicKey)
+{
+  if (!aCertData || aDataSize == 0 || !aPublicKey) {
+    return CryptoX_Error;
+  }
+  *aPublicKey = NULL;
+  CFDataRef certData = CFDataCreate(kCFAllocatorDefault,
+                                    aCertData,
+                                    aDataSize);
+  if (!certData) {
+    return CryptoX_Error;
+  }
+
+  SecCertificateRef cert = SecCertificateCreateWithData(kCFAllocatorDefault,
+                                                        certData);
+  CFRelease(certData);
+  if (!cert) {
+    return CryptoX_Error;
+  }
+
+  OSStatus status = SecCertificateCopyPublicKey(cert,
+                                                (SecKeyRef*)aPublicKey);
+  CFRelease(cert);
+  if (status != 0) {
+    return CryptoX_Error;
+  }
+
+  return CryptoX_Success;
+}
+
+CryptoX_Result
+CryptoMac_VerifySignature(CryptoX_SignatureHandle* aInputData,
+                          CryptoX_PublicKey* aPublicKey,
+                          const unsigned char* aSignature,
+                          unsigned int aSignatureLen)
+{
+  if (!aInputData || !*aInputData || !aPublicKey || !*aPublicKey ||
+      !aSignature || aSignatureLen == 0) {
+    return CryptoX_Error;
+  }
+
+  CFDataRef signatureData = CFDataCreate(kCFAllocatorDefault,
+                                         aSignature, aSignatureLen);
+  if (!signatureData) {
+    return CryptoX_Error;
+  }
+
+  CFErrorRef error;
+  SecTransformRef verifier =
+    SecVerifyTransformCreatePtr((SecKeyRef)*aPublicKey,
+                                signatureData,
+                                &error);
+  if (!verifier || error) {
+    CFRelease(signatureData);
+    return CryptoX_Error;
+  }
+
+  SecTransformSetAttributePtr(verifier,
+                              kSecTransformInputAttributeName,
+                              (CFDataRef)*aInputData,
+                              &error);
+  if (error) {
+    CFRelease(signatureData);
+    CFRelease(verifier);
+    return CryptoX_Error;
+  }
+
+  CryptoX_Result result = CryptoX_Error;
+  CFTypeRef rv = SecTransformExecutePtr(verifier, &error);
+  if (error) {
+    CFRelease(signatureData);
+    CFRelease(verifier);
+    return CryptoX_Error;
+  }
+
+  if (CFGetTypeID(rv) == CFBooleanGetTypeID() &&
+      CFBooleanGetValue((CFBooleanRef)rv) == true) {
+    result = CryptoX_Success;
+  }
+
+  CFRelease(signatureData);
+  CFRelease(verifier);
+
+  return result;
+}
+
+void
+CryptoMac_FreeSignatureHandle(CryptoX_SignatureHandle* aInputData)
+{
+  if (!aInputData || !*aInputData) {
+    return;
+  }
+
+  CFMutableDataRef inputData = NULL;
+  inputData = (CFMutableDataRef)*aInputData;
+
+  CFRelease(inputData);
+}
+
+void
+CryptoMac_FreePublicKey(CryptoX_PublicKey* aPublicKey)
+{
+  if (!aPublicKey || !*aPublicKey) {
+    return;
+  }
+
+  CFRelease((SecKeyRef)*aPublicKey);
+}
diff --git a/modules/libmar/verify/cryptox.c b/modules/libmar/verify/cryptox.c
new file mode 100644
index 000000000..af3421038
--- /dev/null
+++ b/modules/libmar/verify/cryptox.c
@@ -0,0 +1,273 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifdef XP_WIN
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#endif
+
+#include <stdlib.h>
+#include "cryptox.h"
+
+#if defined(MAR_NSS)
+
+/** 
+ * Loads the public key for the specified cert name from the NSS store.
+ * 
+ * @param certData  The DER-encoded X509 certificate to extract the key from.
+ * @param certDataSize The size of certData.
+ * @param publicKey Out parameter for the public key to use.
+ * @return CryptoX_Success on success, CryptoX_Error on error.
+*/
+CryptoX_Result
+NSS_LoadPublicKey(const unsigned char *certData, unsigned int certDataSize,
+                  SECKEYPublicKey **publicKey)
+{
+  CERTCertificate * cert;
+  SECItem certDataItem = { siBuffer, (unsigned char*) certData, certDataSize };
+
+  if (!certData || !publicKey) {
+    return CryptoX_Error;
+  }
+
+  cert = CERT_NewTempCertificate(CERT_GetDefaultCertDB(), &certDataItem, NULL,
+                                 PR_FALSE, PR_TRUE);
+  /* Get the cert and embedded public key out of the database */
+  if (!cert) {
+    return CryptoX_Error;
+  }
+  *publicKey = CERT_ExtractPublicKey(cert);
+  CERT_DestroyCertificate(cert);
+
+  if (!*publicKey) {
+    return CryptoX_Error;
+  }
+  return CryptoX_Success;
+}
+
+CryptoX_Result
+NSS_VerifyBegin(VFYContext **ctx, 
+                SECKEYPublicKey * const *publicKey)
+{
+  SECStatus status;
+  if (!ctx || !publicKey || !*publicKey) {
+    return CryptoX_Error;
+  }
+
+  /* Check that the key length is large enough for our requirements */
+  if ((SECKEY_PublicKeyStrength(*publicKey) * 8) < 
+      XP_MIN_SIGNATURE_LEN_IN_BYTES) {
+    fprintf(stderr, "ERROR: Key length must be >= %d bytes\n", 
+            XP_MIN_SIGNATURE_LEN_IN_BYTES);
+    return CryptoX_Error;
+  }
+
+  *ctx = VFY_CreateContext(*publicKey, NULL, 
+                           SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, NULL);
+  if (*ctx == NULL) {
+    return CryptoX_Error;
+  }
+
+  status = VFY_Begin(*ctx);
+  return SECSuccess == status ? CryptoX_Success : CryptoX_Error;
+}
+
+/**
+ * Verifies if a verify context matches the passed in signature.
+ *
+ * @param ctx          The verify context that the signature should match.
+ * @param signature    The signature to match.
+ * @param signatureLen The length of the signature.
+ * @return CryptoX_Success on success, CryptoX_Error on error.
+*/
+CryptoX_Result
+NSS_VerifySignature(VFYContext * const *ctx, 
+                    const unsigned char *signature, 
+                    unsigned int signatureLen)
+{
+  SECItem signedItem;
+  SECStatus status;
+  if (!ctx || !signature || !*ctx) {
+    return CryptoX_Error;
+  }
+
+  signedItem.len = signatureLen;
+  signedItem.data = (unsigned char*)signature;
+  status = VFY_EndWithSignature(*ctx, &signedItem);
+  return SECSuccess == status ? CryptoX_Success : CryptoX_Error;
+}
+
+#elif defined(XP_WIN)
+/**
+ * Verifies if a signature + public key matches a hash context.
+ *
+ * @param hash      The hash context that the signature should match.
+ * @param pubKey    The public key to use on the signature.
+ * @param signature The signature to check.
+ * @param signatureLen The length of the signature.
+ * @return CryptoX_Success on success, CryptoX_Error on error.
+*/
+CryptoX_Result
+CyprtoAPI_VerifySignature(HCRYPTHASH *hash, 
+                          HCRYPTKEY *pubKey,
+                          const BYTE *signature, 
+                          DWORD signatureLen)
+{
+  DWORD i;
+  BOOL result;
+/* Windows APIs expect the bytes in the signature to be in little-endian 
+ * order, but we write the signature in big-endian order.  Other APIs like 
+ * NSS and OpenSSL expect big-endian order.
+ */
+  BYTE *signatureReversed;
+  if (!hash || !pubKey || !signature || signatureLen < 1) {
+    return CryptoX_Error;
+  }
+
+  signatureReversed = malloc(signatureLen);
+  if (!signatureReversed) {
+    return CryptoX_Error;
+  }
+
+  for (i = 0; i < signatureLen; i++) {
+    signatureReversed[i] = signature[signatureLen - 1 - i]; 
+  }
+  result = CryptVerifySignature(*hash, signatureReversed,
+                                signatureLen, *pubKey, NULL, 0);
+  free(signatureReversed);
+  return result ? CryptoX_Success : CryptoX_Error;
+}
+
+/** 
+ * Obtains the public key for the passed in cert data
+ * 
+ * @param provider       The cyrto provider
+ * @param certData       Data of the certificate to extract the public key from
+ * @param sizeOfCertData The size of the certData buffer
+ * @param certStore      Pointer to the handle of the certificate store to use
+ * @param CryptoX_Success on success
+*/
+CryptoX_Result
+CryptoAPI_LoadPublicKey(HCRYPTPROV provider, 
+                        BYTE *certData,
+                        DWORD sizeOfCertData,
+                        HCRYPTKEY *publicKey)
+{
+  CRYPT_DATA_BLOB blob;
+  CERT_CONTEXT *context;
+  if (!provider || !certData || !publicKey) {
+    return CryptoX_Error;
+  }
+
+  blob.cbData = sizeOfCertData;
+  blob.pbData = certData;
+  if (!CryptQueryObject(CERT_QUERY_OBJECT_BLOB, &blob, 
+                        CERT_QUERY_CONTENT_FLAG_CERT, 
+                        CERT_QUERY_FORMAT_FLAG_BINARY, 
+                        0, NULL, NULL, NULL, 
+                        NULL, NULL, (const void **)&context)) {
+    return CryptoX_Error;
+  }
+
+  if (!CryptImportPublicKeyInfo(provider, 
+                                PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
+                                &context->pCertInfo->SubjectPublicKeyInfo,
+                                publicKey)) {
+    CertFreeCertificateContext(context);
+    return CryptoX_Error;
+  }
+
+  CertFreeCertificateContext(context);
+  return CryptoX_Success;
+}
+
+/* Try to acquire context in this way:
+  * 1. Enhanced provider without creating a new key set
+  * 2. Enhanced provider with creating a new key set
+  * 3. Default provider without creating a new key set
+  * 4. Default provider without creating a new key set
+  * #2 and #4 should not be needed because of the CRYPT_VERIFYCONTEXT, 
+  * but we add it just in case.
+  *
+  * @param provider Out parameter containing the provider handle.
+  * @return CryptoX_Success on success, CryptoX_Error on error.
+ */
+CryptoX_Result
+CryptoAPI_InitCryptoContext(HCRYPTPROV *provider)
+{
+  if (!CryptAcquireContext(provider, 
+                           NULL, 
+                           MS_ENHANCED_PROV, 
+                           PROV_RSA_FULL, 
+                           CRYPT_VERIFYCONTEXT)) {
+    if (!CryptAcquireContext(provider, 
+                             NULL, 
+                             MS_ENHANCED_PROV, 
+                             PROV_RSA_FULL, 
+                             CRYPT_NEWKEYSET | CRYPT_VERIFYCONTEXT)) {
+      if (!CryptAcquireContext(provider, 
+                               NULL, 
+                               NULL, 
+                               PROV_RSA_FULL, 
+                               CRYPT_VERIFYCONTEXT)) {
+        if (!CryptAcquireContext(provider, 
+                                 NULL, 
+                                 NULL, 
+                                 PROV_RSA_FULL, 
+                                 CRYPT_NEWKEYSET | CRYPT_VERIFYCONTEXT)) {
+          *provider = CryptoX_InvalidHandleValue;
+          return CryptoX_Error;
+        }
+      }
+    }
+  }
+  return CryptoX_Success;
+}
+
+/** 
+  * Begins a signature verification hash context
+  *
+  * @param provider The crypt provider to use
+  * @param hash     Out parameter for a handle to the hash context
+  * @return CryptoX_Success on success, CryptoX_Error on error.
+*/
+CryptoX_Result
+CryptoAPI_VerifyBegin(HCRYPTPROV provider, HCRYPTHASH* hash)
+{
+  BOOL result;
+  if (!provider || !hash) {
+    return CryptoX_Error;
+  }
+
+  *hash = (HCRYPTHASH)NULL;
+  result = CryptCreateHash(provider, CALG_SHA1,
+                           0, 0, hash);
+  return result ? CryptoX_Success : CryptoX_Error;
+}
+
+/** 
+  * Updates a signature verification hash context
+  *
+  * @param hash The hash context to udpate
+  * @param buf  The buffer to update the hash context with
+  * @param len The size of the passed in buffer
+  * @return CryptoX_Success on success, CryptoX_Error on error.
+*/
+CryptoX_Result
+CryptoAPI_VerifyUpdate(HCRYPTHASH* hash, BYTE *buf, DWORD len)
+{
+  BOOL result;
+  if (!hash || !buf) {
+    return CryptoX_Error;
+  }
+
+  result = CryptHashData(*hash, buf, len, 0);
+  return result ? CryptoX_Success : CryptoX_Error;
+}
+
+#endif
+
+
+
diff --git a/modules/libmar/verify/cryptox.h b/modules/libmar/verify/cryptox.h
new file mode 100644
index 000000000..2296b815f
--- /dev/null
+++ b/modules/libmar/verify/cryptox.h
@@ -0,0 +1,172 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef CRYPTOX_H
+#define CRYPTOX_H
+
+#define XP_MIN_SIGNATURE_LEN_IN_BYTES 256
+
+#define CryptoX_Result int
+#define CryptoX_Success 0
+#define CryptoX_Error (-1)
+#define CryptoX_Succeeded(X) ((X) == CryptoX_Success)
+#define CryptoX_Failed(X) ((X) != CryptoX_Success)
+
+#if defined(MAR_NSS)
+
+#include "cert.h"
+#include "keyhi.h"
+#include "cryptohi.h"
+
+#define CryptoX_InvalidHandleValue NULL
+#define CryptoX_ProviderHandle void*
+#define CryptoX_SignatureHandle VFYContext *
+#define CryptoX_PublicKey SECKEYPublicKey *
+#define CryptoX_Certificate CERTCertificate *
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+CryptoX_Result NSS_LoadPublicKey(const unsigned char* certData,
+                                 unsigned int certDataSize,
+                                 SECKEYPublicKey** publicKey);
+CryptoX_Result NSS_VerifyBegin(VFYContext **ctx,
+                               SECKEYPublicKey * const *publicKey);
+CryptoX_Result NSS_VerifySignature(VFYContext * const *ctx ,
+                                   const unsigned char *signature,
+                                   unsigned int signatureLen);
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#define CryptoX_InitCryptoProvider(CryptoHandle) \
+  CryptoX_Success
+#define CryptoX_VerifyBegin(CryptoHandle, SignatureHandle, PublicKey) \
+  NSS_VerifyBegin(SignatureHandle, PublicKey)
+#define CryptoX_FreeSignatureHandle(SignatureHandle) \
+  VFY_DestroyContext(*SignatureHandle, PR_TRUE)
+#define CryptoX_VerifyUpdate(SignatureHandle, buf, len) \
+  VFY_Update(*SignatureHandle, (const unsigned char*)(buf), len)
+#define CryptoX_LoadPublicKey(CryptoHandle, certData, dataSize, publicKey) \
+  NSS_LoadPublicKey(certData, dataSize, publicKey)
+#define CryptoX_VerifySignature(hash, publicKey, signedData, len) \
+  NSS_VerifySignature(hash, (const unsigned char *)(signedData), len)
+#define CryptoX_FreePublicKey(key) \
+  SECKEY_DestroyPublicKey(*key)
+#define CryptoX_FreeCertificate(cert) \
+  CERT_DestroyCertificate(*cert)
+
+#elif XP_MACOSX
+
+#define CryptoX_InvalidHandleValue NULL
+#define CryptoX_ProviderHandle void*
+#define CryptoX_SignatureHandle void*
+#define CryptoX_PublicKey void*
+#define CryptoX_Certificate void*
+
+// Forward-declare Objective-C functions implemented in MacVerifyCrypto.mm.
+#ifdef __cplusplus
+extern "C" {
+#endif
+CryptoX_Result CryptoMac_InitCryptoProvider();
+CryptoX_Result CryptoMac_VerifyBegin(CryptoX_SignatureHandle* aInputData);
+CryptoX_Result CryptoMac_VerifyUpdate(CryptoX_SignatureHandle* aInputData,
+                                      void* aBuf, unsigned int aLen);
+CryptoX_Result CryptoMac_LoadPublicKey(const unsigned char* aCertData,
+                                       unsigned int aDataSize,
+                                       CryptoX_PublicKey* aPublicKey);
+CryptoX_Result CryptoMac_VerifySignature(CryptoX_SignatureHandle* aInputData,
+                                         CryptoX_PublicKey* aPublicKey,
+                                         const unsigned char* aSignature,
+                                         unsigned int aSignatureLen);
+void CryptoMac_FreeSignatureHandle(CryptoX_SignatureHandle* aInputData);
+void CryptoMac_FreePublicKey(CryptoX_PublicKey* aPublicKey);
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#define CryptoX_InitCryptoProvider(aProviderHandle) \
+  CryptoMac_InitCryptoProvider()
+#define CryptoX_VerifyBegin(aCryptoHandle, aInputData, aPublicKey) \
+  CryptoMac_VerifyBegin(aInputData)
+#define CryptoX_VerifyUpdate(aInputData, aBuf, aLen) \
+  CryptoMac_VerifyUpdate(aInputData, aBuf, aLen)
+#define CryptoX_LoadPublicKey(aProviderHandle, aCertData, aDataSize, \
+                              aPublicKey) \
+  CryptoMac_LoadPublicKey(aCertData, aDataSize, aPublicKey)
+#define CryptoX_VerifySignature(aInputData, aPublicKey, aSignature, \
+                                aSignatureLen) \
+  CryptoMac_VerifySignature(aInputData, aPublicKey, aSignature, aSignatureLen)
+#define CryptoX_FreeSignatureHandle(aInputData) \
+  CryptoMac_FreeSignatureHandle(aInputData)
+#define CryptoX_FreePublicKey(aPublicKey) \
+  CryptoMac_FreePublicKey(aPublicKey)
+#define CryptoX_FreeCertificate(aCertificate)
+
+#elif defined(XP_WIN) 
+
+#include <windows.h>
+#include <wincrypt.h>
+
+CryptoX_Result CryptoAPI_InitCryptoContext(HCRYPTPROV *provider);
+CryptoX_Result CryptoAPI_LoadPublicKey(HCRYPTPROV hProv, 
+                                       BYTE *certData,
+                                       DWORD sizeOfCertData,
+                                       HCRYPTKEY *publicKey);
+CryptoX_Result CryptoAPI_VerifyBegin(HCRYPTPROV provider, HCRYPTHASH* hash);
+CryptoX_Result CryptoAPI_VerifyUpdate(HCRYPTHASH* hash, 
+                                      BYTE *buf, DWORD len);
+CryptoX_Result CyprtoAPI_VerifySignature(HCRYPTHASH *hash, 
+                                         HCRYPTKEY *pubKey,
+                                         const BYTE *signature, 
+                                         DWORD signatureLen);
+
+#define CryptoX_InvalidHandleValue ((ULONG_PTR)NULL)
+#define CryptoX_ProviderHandle HCRYPTPROV
+#define CryptoX_SignatureHandle HCRYPTHASH
+#define CryptoX_PublicKey HCRYPTKEY
+#define CryptoX_Certificate HCERTSTORE
+#define CryptoX_InitCryptoProvider(CryptoHandle) \
+  CryptoAPI_InitCryptoContext(CryptoHandle)
+#define CryptoX_VerifyBegin(CryptoHandle, SignatureHandle, PublicKey) \
+  CryptoAPI_VerifyBegin(CryptoHandle, SignatureHandle)
+#define CryptoX_FreeSignatureHandle(SignatureHandle)
+#define CryptoX_VerifyUpdate(SignatureHandle, buf, len) \
+  CryptoAPI_VerifyUpdate(SignatureHandle, (BYTE *)(buf), len)
+#define CryptoX_LoadPublicKey(CryptoHandle, certData, dataSize, publicKey) \
+  CryptoAPI_LoadPublicKey(CryptoHandle, (BYTE*)(certData), dataSize, publicKey)
+#define CryptoX_VerifySignature(hash, publicKey, signedData, len) \
+  CyprtoAPI_VerifySignature(hash, publicKey, signedData, len)
+#define CryptoX_FreePublicKey(key) \
+  CryptDestroyKey(*(key))
+#define CryptoX_FreeCertificate(cert) \
+  CertCloseStore(*(cert), CERT_CLOSE_STORE_FORCE_FLAG);
+
+#else
+
+/* This default implementation is necessary because we don't want to
+ * link to NSS from updater code on non Windows platforms.  On Windows
+ * we use CyrptoAPI instead of NSS.  We don't call any function as they
+ * would just fail, but this simplifies linking.
+ */
+
+#define CryptoX_InvalidHandleValue NULL
+#define CryptoX_ProviderHandle void*
+#define CryptoX_SignatureHandle void*
+#define CryptoX_PublicKey void*
+#define CryptoX_Certificate void*
+#define CryptoX_InitCryptoProvider(CryptoHandle) \
+  CryptoX_Error
+#define CryptoX_VerifyBegin(CryptoHandle, SignatureHandle, PublicKey) \
+  CryptoX_Error
+#define CryptoX_FreeSignatureHandle(SignatureHandle)
+#define CryptoX_VerifyUpdate(SignatureHandle, buf, len) CryptoX_Error
+#define CryptoX_LoadPublicKey(CryptoHandle, certData, dataSize, publicKey) \
+  CryptoX_Error
+#define CryptoX_VerifySignature(hash, publicKey, signedData, len) CryptoX_Error
+#define CryptoX_FreePublicKey(key) CryptoX_Error
+
+#endif
+
+#endif
diff --git a/modules/libmar/verify/mar_verify.c b/modules/libmar/verify/mar_verify.c
new file mode 100644
index 000000000..3e32ab266
--- /dev/null
+++ b/modules/libmar/verify/mar_verify.c
@@ -0,0 +1,466 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifdef XP_WIN
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include "mar_private.h"
+#include "mar.h"
+#include "cryptox.h"
+
+int
+mar_read_entire_file(const char * filePath, uint32_t maxSize,
+                     /*out*/ const uint8_t * *data,
+                     /*out*/ uint32_t *size)
+{
+  int result;
+  FILE * f;
+
+  if (!filePath || !data || !size) {
+    return -1;
+  }
+
+  f = fopen(filePath, "rb");
+  if (!f) {
+    return -1;
+  }
+
+  result = -1;
+  if (!fseeko(f, 0, SEEK_END)) {
+    int64_t fileSize = ftello(f);
+    if (fileSize > 0 && fileSize <= maxSize && !fseeko(f, 0, SEEK_SET)) {
+      unsigned char * fileData;
+
+      *size = (unsigned int) fileSize;
+      fileData = malloc(*size);
+      if (fileData) {
+        if (fread(fileData, *size, 1, f) == 1) {
+          *data = fileData;
+          result = 0;
+        } else {
+          free(fileData);
+        }
+      }
+    }
+  }
+
+  fclose(f);
+
+  return result;
+}
+
+int mar_extract_and_verify_signatures_fp(FILE *fp,
+                                         CryptoX_ProviderHandle provider,
+                                         CryptoX_PublicKey *keys,
+                                         uint32_t keyCount);
+int mar_verify_signatures_for_fp(FILE *fp,
+                                 CryptoX_ProviderHandle provider,
+                                 CryptoX_PublicKey *keys,
+                                 const uint8_t * const *extractedSignatures,
+                                 uint32_t keyCount,
+                                 uint32_t *numVerified);
+
+/**
+ * Reads the specified number of bytes from the file pointer and
+ * stores them in the passed buffer.
+ *
+ * @param  fp     The file pointer to read from.
+ * @param  buffer The buffer to store the read results.
+ * @param  size   The number of bytes to read, buffer must be 
+ *                at least of this size.
+ * @param  ctxs   Pointer to the first element in an array of verify context.
+ * @param  count  The number of elements in ctxs
+ * @param  err    The name of what is being written to in case of error.
+ * @return  0 on success
+ *         -1 on read error
+ *         -2 on verify update error
+*/
+int
+ReadAndUpdateVerifyContext(FILE *fp, 
+                           void *buffer,
+                           uint32_t size, 
+                           CryptoX_SignatureHandle *ctxs,
+                           uint32_t count,
+                           const char *err) 
+{
+  uint32_t k;
+  if (!fp || !buffer || !ctxs || count == 0 || !err) {
+    fprintf(stderr, "ERROR: Invalid parameter specified.\n");
+    return CryptoX_Error;
+  }
+
+  if (!size) { 
+    return CryptoX_Success;
+  }
+
+  if (fread(buffer, size, 1, fp) != 1) {
+    fprintf(stderr, "ERROR: Could not read %s\n", err);
+    return CryptoX_Error;
+  }
+
+  for (k = 0; k < count; k++) {
+    if (CryptoX_Failed(CryptoX_VerifyUpdate(&ctxs[k], buffer, size))) {
+      fprintf(stderr, "ERROR: Could not update verify context for %s\n", err);
+      return -2;
+    }
+  }
+  return CryptoX_Success;
+}
+
+/**
+ * Verifies a MAR file by verifying each signature with the corresponding
+ * certificate. That is, the first signature will be verified using the first
+ * certificate given, the second signature will be verified using the second
+ * certificate given, etc. The signature count must exactly match the number of
+ * certificates given, and all signature verifications must succeed.
+ * 
+ * @param  mar            The file who's signature should be calculated
+ * @param  certData       Pointer to the first element in an array of
+ *                        certificate data
+ * @param  certDataSizes  Pointer to the first element in an array for size of
+ *                        the data stored
+ * @param  certCount      The number of elements in certData and certDataSizes
+ * @return 0 on success
+*/
+int
+mar_verify_signatures(MarFile *mar,
+                      const uint8_t * const *certData,
+                      const uint32_t *certDataSizes,
+                      uint32_t certCount) {
+  int rv = -1;
+  CryptoX_ProviderHandle provider = CryptoX_InvalidHandleValue;
+  CryptoX_PublicKey keys[MAX_SIGNATURES];
+  uint32_t k;
+  
+  memset(keys, 0, sizeof(keys));
+
+  if (!mar || !certData || !certDataSizes || certCount == 0) {
+    fprintf(stderr, "ERROR: Invalid parameter specified.\n");
+    goto failure;
+  }
+
+  if (!mar->fp) {
+    fprintf(stderr, "ERROR: MAR file is not open.\n");
+    goto failure;
+  }
+
+  if (CryptoX_Failed(CryptoX_InitCryptoProvider(&provider))) { 
+    fprintf(stderr, "ERROR: Could not init crytpo library.\n");
+    goto failure;
+  }
+
+  for (k = 0; k < certCount; ++k) {
+    if (CryptoX_Failed(CryptoX_LoadPublicKey(provider, certData[k], certDataSizes[k],
+                                             &keys[k]))) {
+      fprintf(stderr, "ERROR: Could not load public key.\n");
+      goto failure;
+    }
+  }
+
+  rv = mar_extract_and_verify_signatures_fp(mar->fp, provider, keys, certCount);
+
+failure:
+
+  for (k = 0; k < certCount; ++k) {
+    if (keys[k]) {
+      CryptoX_FreePublicKey(&keys[k]);
+    }
+  }
+
+  return rv;
+}
+
+/**
+ * Extracts each signature from the specified MAR file,
+ * then calls mar_verify_signatures_for_fp to verify each signature.
+ *
+ * @param  fp       An opened MAR file handle
+ * @param  provider A library provider
+ * @param  keys     The public keys to use to verify the MAR
+ * @param  keyCount The number of keys pointed to by keys
+ * @return 0 on success
+*/
+int
+mar_extract_and_verify_signatures_fp(FILE *fp,
+                                     CryptoX_ProviderHandle provider,
+                                     CryptoX_PublicKey *keys,
+                                     uint32_t keyCount) {
+  uint32_t signatureCount, signatureLen, numVerified = 0;
+  uint32_t signatureAlgorithmIDs[MAX_SIGNATURES];
+  uint8_t *extractedSignatures[MAX_SIGNATURES];
+  uint32_t i;
+
+  memset(signatureAlgorithmIDs, 0, sizeof(signatureAlgorithmIDs));
+  memset(extractedSignatures, 0, sizeof(extractedSignatures));
+
+  if (!fp) {
+    fprintf(stderr, "ERROR: Invalid file pointer passed.\n");
+    return CryptoX_Error;
+  }
+  
+  /* To protect against invalid MAR files, we assumes that the MAR file 
+     size is less than or equal to MAX_SIZE_OF_MAR_FILE. */
+  if (fseeko(fp, 0, SEEK_END)) {
+    fprintf(stderr, "ERROR: Could not seek to the end of the MAR file.\n");
+    return CryptoX_Error;
+  }
+  if (ftello(fp) > MAX_SIZE_OF_MAR_FILE) {
+    fprintf(stderr, "ERROR: MAR file is too large to be verified.\n");
+    return CryptoX_Error;
+  }
+
+  /* Skip to the start of the signature block */
+  if (fseeko(fp, SIGNATURE_BLOCK_OFFSET, SEEK_SET)) {
+    fprintf(stderr, "ERROR: Could not seek to the signature block.\n");
+    return CryptoX_Error;
+  }
+
+  /* Get the number of signatures */
+  if (fread(&signatureCount, sizeof(signatureCount), 1, fp) != 1) {
+    fprintf(stderr, "ERROR: Could not read number of signatures.\n");
+    return CryptoX_Error;
+  }
+  signatureCount = ntohl(signatureCount);
+
+  /* Check that we have less than the max amount of signatures so we don't
+     waste too much of either updater's or signmar's time. */
+  if (signatureCount > MAX_SIGNATURES) {
+    fprintf(stderr, "ERROR: At most %d signatures can be specified.\n",
+            MAX_SIGNATURES);
+    return CryptoX_Error;
+  }
+
+  for (i = 0; i < signatureCount; i++) {
+    /* Get the signature algorithm ID */
+    if (fread(&signatureAlgorithmIDs[i], sizeof(uint32_t), 1, fp) != 1) {
+      fprintf(stderr, "ERROR: Could not read signatures algorithm ID.\n");
+      return CryptoX_Error;
+    }
+    signatureAlgorithmIDs[i] = ntohl(signatureAlgorithmIDs[i]);
+  
+    if (fread(&signatureLen, sizeof(uint32_t), 1, fp) != 1) {
+      fprintf(stderr, "ERROR: Could not read signatures length.\n");
+      return CryptoX_Error;
+    }
+    signatureLen = ntohl(signatureLen);
+
+    /* To protected against invalid input make sure the signature length
+       isn't too big. */
+    if (signatureLen > MAX_SIGNATURE_LENGTH) {
+      fprintf(stderr, "ERROR: Signature length is too large to verify.\n");
+      return CryptoX_Error;
+    }
+
+    extractedSignatures[i] = malloc(signatureLen);
+    if (!extractedSignatures[i]) {
+      fprintf(stderr, "ERROR: Could allocate buffer for signature.\n");
+      return CryptoX_Error;
+    }
+    if (fread(extractedSignatures[i], signatureLen, 1, fp) != 1) {
+      fprintf(stderr, "ERROR: Could not read extracted signature.\n");
+      for (i = 0; i < signatureCount; ++i) {
+        free(extractedSignatures[i]);
+      }
+      return CryptoX_Error;
+    }
+
+    /* We don't try to verify signatures we don't know about */
+    if (signatureAlgorithmIDs[i] != 1) {
+      fprintf(stderr, "ERROR: Unknown signature algorithm ID.\n");
+      for (i = 0; i < signatureCount; ++i) {
+        free(extractedSignatures[i]);
+      }
+      return CryptoX_Error;
+    }
+  }
+
+  if (ftello(fp) == -1) {
+    return CryptoX_Error;
+  }
+  if (mar_verify_signatures_for_fp(fp,
+                                   provider,
+                                   keys,
+                                   (const uint8_t * const *)extractedSignatures,
+                                   signatureCount,
+                                   &numVerified) == CryptoX_Error) {
+    return CryptoX_Error;
+  }
+  for (i = 0; i < signatureCount; ++i) {
+    free(extractedSignatures[i]);
+  }
+
+  /* If we reached here and we verified every
+     signature, return success. */
+  if (numVerified == signatureCount && keyCount == numVerified) {
+    return CryptoX_Success;
+  }
+
+  if (numVerified == 0) {
+    fprintf(stderr, "ERROR: Not all signatures were verified.\n");
+  } else {
+    fprintf(stderr, "ERROR: Only %d of %d signatures were verified.\n",
+            numVerified, signatureCount);
+  }
+  return CryptoX_Error;
+}
+
+/**
+ * Verifies a MAR file by verifying each signature with the corresponding
+ * certificate. That is, the first signature will be verified using the first
+ * certificate given, the second signature will be verified using the second
+ * certificate given, etc. The signature count must exactly match the number of
+ * certificates given, and all signature verifications must succeed.
+ * 
+ * @param  fp                   An opened MAR file handle
+ * @param  provider             A library provider
+ * @param  keys                 A pointer to the first element in an
+ *                              array of keys.
+ * @param  extractedSignatures  Pointer to the first element in an array
+ *                              of extracted signatures.
+ * @param  signatureCount       The number of signatures in the MAR file
+ * @param numVerified           Out parameter which will be filled with
+ *                              the number of verified signatures.
+ *                              This information can be useful for printing
+ *                              error messages.
+ * @return 0 on success, *numVerified == signatureCount.
+*/
+int
+mar_verify_signatures_for_fp(FILE *fp,
+                             CryptoX_ProviderHandle provider,
+                             CryptoX_PublicKey *keys,
+                             const uint8_t * const *extractedSignatures,
+                             uint32_t signatureCount,
+                             uint32_t *numVerified)
+{
+  CryptoX_SignatureHandle signatureHandles[MAX_SIGNATURES];
+  char buf[BLOCKSIZE];
+  uint32_t signatureLengths[MAX_SIGNATURES];
+  uint32_t i;
+  int rv = CryptoX_Error;
+
+  memset(signatureHandles, 0, sizeof(signatureHandles));
+  memset(signatureLengths, 0, sizeof(signatureLengths));
+
+  if (!extractedSignatures || !numVerified) {
+    fprintf(stderr, "ERROR: Invalid parameter specified.\n");
+    goto failure;
+  }
+
+  *numVerified = 0;
+
+  /* This function is only called when we have at least one signature,
+     but to protected against future people who call this function we
+     make sure a non zero value is passed in. 
+   */
+  if (!signatureCount) {
+    fprintf(stderr, "ERROR: There must be at least one signature.\n");
+    goto failure;
+  }
+
+  for (i = 0; i < signatureCount; i++) {
+    if (CryptoX_Failed(CryptoX_VerifyBegin(provider,
+                                           &signatureHandles[i], &keys[i]))) {
+      fprintf(stderr, "ERROR: Could not initialize signature handle.\n");
+      goto failure;
+    }
+  }
+
+  /* Skip to the start of the file */
+  if (fseeko(fp, 0, SEEK_SET)) {
+    fprintf(stderr, "ERROR: Could not seek to start of the file\n");
+    goto failure;
+  }
+
+  /* Bytes 0-3: MAR1
+     Bytes 4-7: index offset 
+     Bytes 8-15: size of entire MAR
+   */
+  if (CryptoX_Failed(ReadAndUpdateVerifyContext(fp, buf, 
+                                                SIGNATURE_BLOCK_OFFSET +
+                                                sizeof(uint32_t),
+                                                signatureHandles,
+                                                signatureCount,
+                                                "signature block"))) {
+    goto failure;
+  }
+
+  /* Read the signature block */
+  for (i = 0; i < signatureCount; i++) {
+    /* Get the signature algorithm ID */
+    if (CryptoX_Failed(ReadAndUpdateVerifyContext(fp,
+                                                  &buf, 
+                                                  sizeof(uint32_t),
+                                                  signatureHandles,
+                                                  signatureCount,
+                                                  "signature algorithm ID"))) {
+      goto failure;
+    }
+
+    if (CryptoX_Failed(ReadAndUpdateVerifyContext(fp, 
+                                                  &signatureLengths[i],
+                                                  sizeof(uint32_t), 
+                                                  signatureHandles,
+                                                  signatureCount,
+                                                  "signature length"))) {
+      goto failure;
+    }
+    signatureLengths[i] = ntohl(signatureLengths[i]);
+    if (signatureLengths[i] > MAX_SIGNATURE_LENGTH) {
+      fprintf(stderr, "ERROR: Embedded signature length is too large.\n");
+      goto failure;
+    }
+
+    /* Skip past the signature itself as those are not included */
+    if (fseeko(fp, signatureLengths[i], SEEK_CUR)) {
+      fprintf(stderr, "ERROR: Could not seek past signature.\n");
+      goto failure;
+    }
+  }
+
+  /* Read the rest of the file after the signature block */
+  while (!feof(fp)) {
+    int numRead = fread(buf, 1, BLOCKSIZE , fp);
+    if (ferror(fp)) {
+      fprintf(stderr, "ERROR: Error reading data block.\n");
+      goto failure;
+    }
+
+    for (i = 0; i < signatureCount; i++) {
+      if (CryptoX_Failed(CryptoX_VerifyUpdate(&signatureHandles[i],
+                                              buf, numRead))) {
+        fprintf(stderr, "ERROR: Error updating verify context with"
+                        " data block.\n");
+        goto failure;
+      }
+    }
+  }
+
+  /* Verify the signatures */
+  for (i = 0; i < signatureCount; i++) {
+    if (CryptoX_Failed(CryptoX_VerifySignature(&signatureHandles[i],
+                                               &keys[i],
+                                               extractedSignatures[i],
+                                               signatureLengths[i]))) {
+      fprintf(stderr, "ERROR: Error verifying signature.\n");
+      goto failure;
+    }
+    ++*numVerified;
+  }
+
+  rv = CryptoX_Success;
+failure:
+  for (i = 0; i < signatureCount; i++) {
+    CryptoX_FreeSignatureHandle(&signatureHandles[i]);
+  }
+
+  return rv;
+}
diff --git a/modules/libmar/verify/moz.build b/modules/libmar/verify/moz.build
new file mode 100644
index 000000000..a2a6b03ec
--- /dev/null
+++ b/modules/libmar/verify/moz.build
@@ -0,0 +1,31 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+Library('verifymar')
+
+UNIFIED_SOURCES += [
+    'cryptox.c',
+    'mar_verify.c',
+]
+
+FORCE_STATIC_LIB = True
+
+if CONFIG['OS_ARCH'] == 'WINNT':
+    USE_STATIC_LIBS = True
+elif CONFIG['OS_ARCH'] == 'Darwin':
+    UNIFIED_SOURCES += [
+      'MacVerifyCrypto.cpp',
+    ]
+    OS_LIBS += [
+      '-framework Security',
+    ]
+else:
+    DEFINES['MAR_NSS'] = True
+    LOCAL_INCLUDES += ['../sign']
+
+LOCAL_INCLUDES += [
+    '../src',
+]