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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /security/nss/lib/smime/cmsencode.c
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'security/nss/lib/smime/cmsencode.c')
-rw-r--r--security/nss/lib/smime/cmsencode.c763
1 files changed, 763 insertions, 0 deletions
diff --git a/security/nss/lib/smime/cmsencode.c b/security/nss/lib/smime/cmsencode.c
new file mode 100644
index 000000000..a4414e008
--- /dev/null
+++ b/security/nss/lib/smime/cmsencode.c
@@ -0,0 +1,763 @@
+/* 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/. */
+
+/*
+ * CMS encoding.
+ */
+
+#include "cmslocal.h"
+
+#include "cert.h"
+#include "key.h"
+#include "secasn1.h"
+#include "secoid.h"
+#include "secitem.h"
+#include "pk11func.h"
+#include "secerr.h"
+
+struct nss_cms_encoder_output {
+ NSSCMSContentCallback outputfn;
+ void *outputarg;
+ PLArenaPool *destpoolp;
+ SECItem *dest;
+};
+
+struct NSSCMSEncoderContextStr {
+ SEC_ASN1EncoderContext *ecx; /* ASN.1 encoder context */
+ PRBool ecxupdated; /* true if data was handed in */
+ NSSCMSMessage *cmsg; /* pointer to the root message */
+ SECOidTag type; /* type tag of the current content */
+ NSSCMSContent content; /* pointer to current content */
+ struct nss_cms_encoder_output output; /* output function */
+ int error; /* error code */
+ NSSCMSEncoderContext *childp7ecx; /* link to child encoder context */
+};
+
+static SECStatus nss_cms_before_data(NSSCMSEncoderContext *p7ecx);
+static SECStatus nss_cms_after_data(NSSCMSEncoderContext *p7ecx);
+static SECStatus nss_cms_encoder_update(NSSCMSEncoderContext *p7ecx,
+ const char *data, unsigned long len);
+static SECStatus nss_cms_encoder_work_data(NSSCMSEncoderContext *p7ecx, SECItem *dest,
+ const unsigned char *data, unsigned long len,
+ PRBool final, PRBool innermost);
+
+extern const SEC_ASN1Template NSSCMSMessageTemplate[];
+
+/*
+ * The little output function that the ASN.1 encoder calls to hand
+ * us bytes which we in turn hand back to our caller (via the callback
+ * they gave us).
+ */
+static void
+nss_cms_encoder_out(void *arg, const char *buf, unsigned long len,
+ int depth, SEC_ASN1EncodingPart data_kind)
+{
+ struct nss_cms_encoder_output *output = (struct nss_cms_encoder_output *)arg;
+ unsigned char *dest;
+ unsigned long offset;
+
+#ifdef CMSDEBUG
+ int i;
+ const char *data_name = "unknown";
+
+ switch (data_kind) {
+ case SEC_ASN1_Identifier:
+ data_name = "identifier";
+ break;
+ case SEC_ASN1_Length:
+ data_name = "length";
+ break;
+ case SEC_ASN1_Contents:
+ data_name = "contents";
+ break;
+ case SEC_ASN1_EndOfContents:
+ data_name = "end-of-contents";
+ break;
+ }
+ fprintf(stderr, "kind = %s, depth = %d, len = %d\n", data_name, depth, len);
+ for (i = 0; i < len; i++) {
+ fprintf(stderr, " %02x%s", (unsigned int)buf[i] & 0xff, ((i % 16) == 15) ? "\n" : "");
+ }
+ if ((i % 16) != 0)
+ fprintf(stderr, "\n");
+#endif
+
+ if (output->outputfn != NULL)
+ /* call output callback with DER data */
+ output->outputfn(output->outputarg, buf, len);
+
+ if (output->dest != NULL) {
+ /* store DER data in SECItem */
+ offset = output->dest->len;
+ if (offset == 0) {
+ dest = (unsigned char *)PORT_ArenaAlloc(output->destpoolp, len);
+ } else {
+ dest = (unsigned char *)PORT_ArenaGrow(output->destpoolp,
+ output->dest->data,
+ output->dest->len,
+ output->dest->len + len);
+ }
+ if (dest == NULL)
+ /* oops */
+ return;
+
+ output->dest->data = dest;
+ output->dest->len += len;
+
+ /* copy it in */
+ if (len) {
+ PORT_Memcpy(output->dest->data + offset, buf, len);
+ }
+ }
+}
+
+/*
+ * nss_cms_encoder_notify - ASN.1 encoder callback
+ *
+ * this function is called by the ASN.1 encoder before and after the encoding of
+ * every object. here, it is used to keep track of data structures, set up
+ * encryption and/or digesting and possibly set up child encoders.
+ */
+static void
+nss_cms_encoder_notify(void *arg, PRBool before, void *dest, int depth)
+{
+ NSSCMSEncoderContext *p7ecx;
+ NSSCMSContentInfo *rootcinfo, *cinfo;
+ PRBool after = !before;
+ SECOidTag childtype;
+ SECItem *item;
+
+ p7ecx = (NSSCMSEncoderContext *)arg;
+ PORT_Assert(p7ecx != NULL);
+
+ rootcinfo = &(p7ecx->cmsg->contentInfo);
+
+#ifdef CMSDEBUG
+ fprintf(stderr, "%6.6s, dest = 0x%08x, depth = %d\n", before ? "before"
+ : "after",
+ dest, depth);
+#endif
+
+ /*
+ * Watch for the content field, at which point we want to instruct
+ * the ASN.1 encoder to start taking bytes from the buffer.
+ */
+ if (NSS_CMSType_IsData(p7ecx->type)) {
+ cinfo = NSS_CMSContent_GetContentInfo(p7ecx->content.pointer, p7ecx->type);
+ if (before && dest == &(cinfo->rawContent)) {
+ /* just set up encoder to grab from user - no encryption or digesting */
+ if ((item = cinfo->content.data) != NULL)
+ (void)nss_cms_encoder_work_data(p7ecx, NULL, item->data,
+ item->len, PR_TRUE, PR_TRUE);
+ else
+ SEC_ASN1EncoderSetTakeFromBuf(p7ecx->ecx);
+ SEC_ASN1EncoderClearNotifyProc(p7ecx->ecx); /* no need to get notified anymore */
+ }
+ } else if (NSS_CMSType_IsWrapper(p7ecx->type)) {
+ /* when we know what the content is, we encode happily until we reach the inner content */
+ cinfo = NSS_CMSContent_GetContentInfo(p7ecx->content.pointer, p7ecx->type);
+ childtype = NSS_CMSContentInfo_GetContentTypeTag(cinfo);
+
+ if (after && dest == &(cinfo->contentType)) {
+ /* we're right before encoding the data (if we have some or not) */
+ /* (for encrypted data, we're right before the contentEncAlg which may change */
+ /* in nss_cms_before_data because of IV calculation when setting up encryption) */
+ if (nss_cms_before_data(p7ecx) != SECSuccess)
+ p7ecx->error = PORT_GetError();
+ }
+ if (before && dest == &(cinfo->rawContent)) {
+ if (p7ecx->childp7ecx == NULL) {
+ if ((NSS_CMSType_IsData(childtype) && (item = cinfo->content.data) != NULL)) {
+ /* we are the innermost non-data and we have data - feed it in */
+ (void)nss_cms_encoder_work_data(p7ecx, NULL, item->data,
+ item->len, PR_TRUE, PR_TRUE);
+ } else {
+ /* else we'll have to get data from user */
+ SEC_ASN1EncoderSetTakeFromBuf(p7ecx->ecx);
+ }
+ } else {
+ /* if we have a nested encoder, wait for its data */
+ SEC_ASN1EncoderSetTakeFromBuf(p7ecx->ecx);
+ }
+ }
+ if (after && dest == &(cinfo->rawContent)) {
+ if (nss_cms_after_data(p7ecx) != SECSuccess)
+ p7ecx->error = PORT_GetError();
+ SEC_ASN1EncoderClearNotifyProc(p7ecx->ecx); /* no need to get notified anymore */
+ }
+ } else {
+ /* we're still in the root message */
+ if (after && dest == &(rootcinfo->contentType)) {
+ /* got the content type OID now - so find out the type tag */
+ p7ecx->type = NSS_CMSContentInfo_GetContentTypeTag(rootcinfo);
+ /* set up a pointer to our current content */
+ p7ecx->content = rootcinfo->content;
+ }
+ }
+}
+
+/*
+ * nss_cms_before_data - setup the current encoder to receive data
+ */
+static SECStatus
+nss_cms_before_data(NSSCMSEncoderContext *p7ecx)
+{
+ SECStatus rv;
+ SECOidTag childtype;
+ NSSCMSContentInfo *cinfo;
+ NSSCMSEncoderContext *childp7ecx;
+ const SEC_ASN1Template *template;
+
+ /* call _Encode_BeforeData handlers */
+ switch (p7ecx->type) {
+ case SEC_OID_PKCS7_SIGNED_DATA:
+ /* we're encoding a signedData, so set up the digests */
+ rv = NSS_CMSSignedData_Encode_BeforeData(p7ecx->content.signedData);
+ break;
+ case SEC_OID_PKCS7_DIGESTED_DATA:
+ /* we're encoding a digestedData, so set up the digest */
+ rv = NSS_CMSDigestedData_Encode_BeforeData(p7ecx->content.digestedData);
+ break;
+ case SEC_OID_PKCS7_ENVELOPED_DATA:
+ rv = NSS_CMSEnvelopedData_Encode_BeforeData(p7ecx->content.envelopedData);
+ break;
+ case SEC_OID_PKCS7_ENCRYPTED_DATA:
+ rv = NSS_CMSEncryptedData_Encode_BeforeData(p7ecx->content.encryptedData);
+ break;
+ default:
+ if (NSS_CMSType_IsWrapper(p7ecx->type)) {
+ rv = NSS_CMSGenericWrapperData_Encode_BeforeData(p7ecx->type,
+ p7ecx->content.genericData);
+ } else {
+ rv = SECFailure;
+ }
+ }
+ if (rv != SECSuccess)
+ return SECFailure;
+
+ /* ok, now we have a pointer to cinfo */
+ /* find out what kind of data is encapsulated */
+
+ cinfo = NSS_CMSContent_GetContentInfo(p7ecx->content.pointer, p7ecx->type);
+ childtype = NSS_CMSContentInfo_GetContentTypeTag(cinfo);
+
+ if (NSS_CMSType_IsWrapper(childtype)) {
+ /* in these cases, we need to set up a child encoder! */
+ /* create new encoder context */
+ childp7ecx = PORT_ZAlloc(sizeof(NSSCMSEncoderContext));
+ if (childp7ecx == NULL)
+ return SECFailure;
+
+ /* the CHILD encoder needs to hand its encoded data to the CURRENT encoder
+ * (which will encrypt and/or digest it)
+ * this needs to route back into our update function
+ * which finds the lowest encoding context & encrypts and computes digests */
+ childp7ecx->type = childtype;
+ childp7ecx->content = cinfo->content;
+ /* use the non-recursive update function here, of course */
+ childp7ecx->output.outputfn = (NSSCMSContentCallback)nss_cms_encoder_update;
+ childp7ecx->output.outputarg = p7ecx;
+ childp7ecx->output.destpoolp = NULL;
+ childp7ecx->output.dest = NULL;
+ childp7ecx->cmsg = p7ecx->cmsg;
+ childp7ecx->ecxupdated = PR_FALSE;
+ childp7ecx->childp7ecx = NULL;
+
+ template = NSS_CMSUtil_GetTemplateByTypeTag(childtype);
+ if (template == NULL)
+ goto loser; /* cannot happen */
+
+ /* now initialize the data for encoding the first third */
+ switch (childp7ecx->type) {
+ case SEC_OID_PKCS7_SIGNED_DATA:
+ rv = NSS_CMSSignedData_Encode_BeforeStart(cinfo->content.signedData);
+ break;
+ case SEC_OID_PKCS7_ENVELOPED_DATA:
+ rv = NSS_CMSEnvelopedData_Encode_BeforeStart(cinfo->content.envelopedData);
+ break;
+ case SEC_OID_PKCS7_DIGESTED_DATA:
+ rv = NSS_CMSDigestedData_Encode_BeforeStart(cinfo->content.digestedData);
+ break;
+ case SEC_OID_PKCS7_ENCRYPTED_DATA:
+ rv = NSS_CMSEncryptedData_Encode_BeforeStart(cinfo->content.encryptedData);
+ break;
+ default:
+ rv = NSS_CMSGenericWrapperData_Encode_BeforeStart(childp7ecx->type,
+ cinfo->content.genericData);
+ break;
+ }
+ if (rv != SECSuccess)
+ goto loser;
+
+ /*
+ * Initialize the BER encoder.
+ */
+ childp7ecx->ecx = SEC_ASN1EncoderStart(cinfo->content.pointer, template,
+ nss_cms_encoder_out, &(childp7ecx->output));
+ if (childp7ecx->ecx == NULL)
+ goto loser;
+
+ /*
+ * Indicate that we are streaming. We will be streaming until we
+ * get past the contents bytes.
+ */
+ if (!cinfo->privateInfo || !cinfo->privateInfo->dontStream)
+ SEC_ASN1EncoderSetStreaming(childp7ecx->ecx);
+
+ /*
+ * The notify function will watch for the contents field.
+ */
+ p7ecx->childp7ecx = childp7ecx;
+ SEC_ASN1EncoderSetNotifyProc(childp7ecx->ecx, nss_cms_encoder_notify,
+ childp7ecx);
+
+ /* please note that we are NOT calling SEC_ASN1EncoderUpdate here to kick off the */
+ /* encoding process - we'll do that from the update function instead */
+ /* otherwise we'd be encoding data from a call of the notify function of the */
+ /* parent encoder (which would not work) */
+
+ } else if (NSS_CMSType_IsData(childtype)) {
+ p7ecx->childp7ecx = NULL;
+ } else {
+ /* we do not know this type */
+ p7ecx->error = SEC_ERROR_BAD_DER;
+ }
+
+ return SECSuccess;
+
+loser:
+ if (childp7ecx) {
+ if (childp7ecx->ecx)
+ SEC_ASN1EncoderFinish(childp7ecx->ecx);
+ PORT_Free(childp7ecx);
+ p7ecx->childp7ecx = NULL;
+ }
+ return SECFailure;
+}
+
+static SECStatus
+nss_cms_after_data(NSSCMSEncoderContext *p7ecx)
+{
+ SECStatus rv = SECFailure;
+
+ switch (p7ecx->type) {
+ case SEC_OID_PKCS7_SIGNED_DATA:
+ /* this will finish the digests and sign */
+ rv = NSS_CMSSignedData_Encode_AfterData(p7ecx->content.signedData);
+ break;
+ case SEC_OID_PKCS7_ENVELOPED_DATA:
+ rv = NSS_CMSEnvelopedData_Encode_AfterData(p7ecx->content.envelopedData);
+ break;
+ case SEC_OID_PKCS7_DIGESTED_DATA:
+ rv = NSS_CMSDigestedData_Encode_AfterData(p7ecx->content.digestedData);
+ break;
+ case SEC_OID_PKCS7_ENCRYPTED_DATA:
+ rv = NSS_CMSEncryptedData_Encode_AfterData(p7ecx->content.encryptedData);
+ break;
+ default:
+ if (NSS_CMSType_IsWrapper(p7ecx->type)) {
+ rv = NSS_CMSGenericWrapperData_Encode_AfterData(p7ecx->type,
+ p7ecx->content.genericData);
+ } else {
+ rv = SECFailure;
+ }
+ break;
+ }
+ return rv;
+}
+
+/*
+ * nss_cms_encoder_work_data - process incoming data
+ *
+ * (from the user or the next encoding layer)
+ * Here, we need to digest and/or encrypt, then pass it on
+ */
+static SECStatus
+nss_cms_encoder_work_data(NSSCMSEncoderContext *p7ecx, SECItem *dest,
+ const unsigned char *data, unsigned long len,
+ PRBool final, PRBool innermost)
+{
+ unsigned char *buf = NULL;
+ SECStatus rv;
+ NSSCMSContentInfo *cinfo;
+
+ rv = SECSuccess; /* may as well be optimistic */
+
+ /*
+ * We should really have data to process, or we should be trying
+ * to finish/flush the last block. (This is an overly paranoid
+ * check since all callers are in this file and simple inspection
+ * proves they do it right. But it could find a bug in future
+ * modifications/development, that is why it is here.)
+ */
+ PORT_Assert((data != NULL && len) || final);
+
+ /* we got data (either from the caller, or from a lower level encoder) */
+ cinfo = NSS_CMSContent_GetContentInfo(p7ecx->content.pointer, p7ecx->type);
+ if (!cinfo) {
+ /* The original programmer didn't expect this to happen */
+ p7ecx->error = SEC_ERROR_LIBRARY_FAILURE;
+ return SECFailure;
+ }
+
+ /* Update the running digest. */
+ if (len && cinfo->privateInfo && cinfo->privateInfo->digcx != NULL)
+ NSS_CMSDigestContext_Update(cinfo->privateInfo->digcx, data, len);
+
+ /* Encrypt this chunk. */
+ if (cinfo->privateInfo && cinfo->privateInfo->ciphcx != NULL) {
+ unsigned int inlen; /* length of data being encrypted */
+ unsigned int outlen; /* length of encrypted data */
+ unsigned int buflen; /* length available for encrypted data */
+
+ inlen = len;
+ buflen = NSS_CMSCipherContext_EncryptLength(cinfo->privateInfo->ciphcx,
+ inlen, final);
+ if (buflen == 0) {
+ /*
+ * No output is expected, but the input data may be buffered
+ * so we still have to call Encrypt.
+ */
+ rv = NSS_CMSCipherContext_Encrypt(cinfo->privateInfo->ciphcx, NULL, NULL, 0,
+ data, inlen, final);
+ if (final) {
+ len = 0;
+ goto done;
+ }
+ return rv;
+ }
+
+ if (dest != NULL)
+ buf = (unsigned char *)PORT_ArenaAlloc(p7ecx->cmsg->poolp, buflen);
+ else
+ buf = (unsigned char *)PORT_Alloc(buflen);
+
+ if (buf == NULL) {
+ rv = SECFailure;
+ } else {
+ rv = NSS_CMSCipherContext_Encrypt(cinfo->privateInfo->ciphcx, buf,
+ &outlen, buflen,
+ data, inlen, final);
+ data = buf;
+ len = outlen;
+ }
+ if (rv != SECSuccess)
+ /* encryption or malloc failed? */
+ return rv;
+ }
+
+ /*
+ * at this point (data,len) has everything we'd like to give to the CURRENT encoder
+ * (which will encode it, then hand it back to the user or the parent encoder)
+ * We don't encode the data if we're innermost and we're told not to include the data
+ */
+ if (p7ecx->ecx != NULL && len &&
+ (!innermost || cinfo->rawContent != cinfo->content.pointer))
+ rv = SEC_ASN1EncoderUpdate(p7ecx->ecx, (const char *)data, len);
+
+done:
+
+ if (cinfo->privateInfo && cinfo->privateInfo->ciphcx != NULL) {
+ if (dest != NULL) {
+ dest->data = buf;
+ dest->len = len;
+ } else if (buf != NULL) {
+ PORT_Free(buf);
+ }
+ }
+ return rv;
+}
+
+/*
+ * nss_cms_encoder_update - deliver encoded data to the next higher level
+ *
+ * no recursion here because we REALLY want to end up at the next higher encoder!
+ */
+static SECStatus
+nss_cms_encoder_update(NSSCMSEncoderContext *p7ecx, const char *data, unsigned long len)
+{
+ /* XXX Error handling needs help. Return what? Do "Finish" on failure? */
+ return nss_cms_encoder_work_data(p7ecx, NULL, (const unsigned char *)data,
+ len, PR_FALSE, PR_FALSE);
+}
+
+/*
+ * NSS_CMSEncoder_Start - set up encoding of a CMS message
+ *
+ * "cmsg" - message to encode
+ * "outputfn", "outputarg" - callback function for delivery of DER-encoded output
+ * will not be called if NULL.
+ * "dest" - if non-NULL, pointer to SECItem that will hold the DER-encoded output
+ * "destpoolp" - pool to allocate DER-encoded output in
+ * "pwfn", pwfn_arg" - callback function for getting token password
+ * "decrypt_key_cb", "decrypt_key_cb_arg" - callback function for getting bulk key for encryptedData
+ * "detached_digestalgs", "detached_digests" - digests from detached content
+ */
+NSSCMSEncoderContext *
+NSS_CMSEncoder_Start(NSSCMSMessage *cmsg,
+ NSSCMSContentCallback outputfn, void *outputarg,
+ SECItem *dest, PLArenaPool *destpoolp,
+ PK11PasswordFunc pwfn, void *pwfn_arg,
+ NSSCMSGetDecryptKeyCallback decrypt_key_cb, void *decrypt_key_cb_arg,
+ SECAlgorithmID **detached_digestalgs, SECItem **detached_digests)
+{
+ NSSCMSEncoderContext *p7ecx;
+ SECStatus rv;
+ NSSCMSContentInfo *cinfo;
+ SECOidTag tag;
+
+ NSS_CMSMessage_SetEncodingParams(cmsg, pwfn, pwfn_arg, decrypt_key_cb, decrypt_key_cb_arg,
+ detached_digestalgs, detached_digests);
+
+ p7ecx = (NSSCMSEncoderContext *)PORT_ZAlloc(sizeof(NSSCMSEncoderContext));
+ if (p7ecx == NULL) {
+ PORT_SetError(SEC_ERROR_NO_MEMORY);
+ return NULL;
+ }
+
+ p7ecx->cmsg = cmsg;
+ p7ecx->output.outputfn = outputfn;
+ p7ecx->output.outputarg = outputarg;
+ p7ecx->output.dest = dest;
+ p7ecx->output.destpoolp = destpoolp;
+ p7ecx->type = SEC_OID_UNKNOWN;
+
+ cinfo = NSS_CMSMessage_GetContentInfo(cmsg);
+
+ tag = NSS_CMSContentInfo_GetContentTypeTag(cinfo);
+ switch (tag) {
+ case SEC_OID_PKCS7_SIGNED_DATA:
+ rv = NSS_CMSSignedData_Encode_BeforeStart(cinfo->content.signedData);
+ break;
+ case SEC_OID_PKCS7_ENVELOPED_DATA:
+ rv = NSS_CMSEnvelopedData_Encode_BeforeStart(cinfo->content.envelopedData);
+ break;
+ case SEC_OID_PKCS7_DIGESTED_DATA:
+ rv = NSS_CMSDigestedData_Encode_BeforeStart(cinfo->content.digestedData);
+ break;
+ case SEC_OID_PKCS7_ENCRYPTED_DATA:
+ rv = NSS_CMSEncryptedData_Encode_BeforeStart(cinfo->content.encryptedData);
+ break;
+ default:
+ if (NSS_CMSType_IsWrapper(tag)) {
+ rv = NSS_CMSGenericWrapperData_Encode_BeforeStart(tag,
+ p7ecx->content.genericData);
+ } else {
+ rv = SECFailure;
+ }
+ break;
+ }
+ if (rv != SECSuccess) {
+ PORT_Free(p7ecx);
+ return NULL;
+ }
+
+ /* Initialize the BER encoder.
+ * Note that this will not encode anything until the first call to SEC_ASN1EncoderUpdate */
+ p7ecx->ecx = SEC_ASN1EncoderStart(cmsg, NSSCMSMessageTemplate,
+ nss_cms_encoder_out, &(p7ecx->output));
+ if (p7ecx->ecx == NULL) {
+ PORT_Free(p7ecx);
+ return NULL;
+ }
+ p7ecx->ecxupdated = PR_FALSE;
+
+ /*
+ * Indicate that we are streaming. We will be streaming until we
+ * get past the contents bytes.
+ */
+ if (!cinfo->privateInfo || !cinfo->privateInfo->dontStream)
+ SEC_ASN1EncoderSetStreaming(p7ecx->ecx);
+
+ /*
+ * The notify function will watch for the contents field.
+ */
+ SEC_ASN1EncoderSetNotifyProc(p7ecx->ecx, nss_cms_encoder_notify, p7ecx);
+
+ /* this will kick off the encoding process & encode everything up to the content bytes,
+ * at which point the notify function sets streaming mode (and possibly creates
+ * a child encoder). */
+ p7ecx->ecxupdated = PR_TRUE;
+ if (SEC_ASN1EncoderUpdate(p7ecx->ecx, NULL, 0) != SECSuccess) {
+ PORT_Free(p7ecx);
+ return NULL;
+ }
+
+ return p7ecx;
+}
+
+/*
+ * NSS_CMSEncoder_Update - take content data delivery from the user
+ *
+ * "p7ecx" - encoder context
+ * "data" - content data
+ * "len" - length of content data
+ *
+ * need to find the lowest level (and call SEC_ASN1EncoderUpdate on the way down),
+ * then hand the data to the work_data fn
+ */
+SECStatus
+NSS_CMSEncoder_Update(NSSCMSEncoderContext *p7ecx, const char *data, unsigned long len)
+{
+ SECStatus rv;
+ NSSCMSContentInfo *cinfo;
+ SECOidTag childtype;
+
+ if (p7ecx->error)
+ return SECFailure;
+
+ /* hand data to the innermost decoder */
+ if (p7ecx->childp7ecx) {
+ /* tell the child to start encoding, up to its first data byte, if it
+ * hasn't started yet */
+ if (!p7ecx->childp7ecx->ecxupdated) {
+ p7ecx->childp7ecx->ecxupdated = PR_TRUE;
+ if (SEC_ASN1EncoderUpdate(p7ecx->childp7ecx->ecx, NULL, 0) != SECSuccess)
+ return SECFailure;
+ }
+ /* recursion here */
+ rv = NSS_CMSEncoder_Update(p7ecx->childp7ecx, data, len);
+ } else {
+ /* we are at innermost decoder */
+ /* find out about our inner content type - must be data */
+ cinfo = NSS_CMSContent_GetContentInfo(p7ecx->content.pointer, p7ecx->type);
+ if (!cinfo) {
+ /* The original programmer didn't expect this to happen */
+ p7ecx->error = SEC_ERROR_LIBRARY_FAILURE;
+ return SECFailure;
+ }
+
+ childtype = NSS_CMSContentInfo_GetContentTypeTag(cinfo);
+ if (!NSS_CMSType_IsData(childtype))
+ return SECFailure;
+ /* and we must not have preset data */
+ if (cinfo->content.data != NULL)
+ return SECFailure;
+
+ /* hand it the data so it can encode it (let DER trickle up the chain) */
+ rv = nss_cms_encoder_work_data(p7ecx, NULL, (const unsigned char *)data,
+ len, PR_FALSE, PR_TRUE);
+ }
+ return rv;
+}
+
+/*
+ * NSS_CMSEncoder_Cancel - stop all encoding
+ *
+ * we need to walk down the chain of encoders and the finish them from the innermost out
+ */
+SECStatus
+NSS_CMSEncoder_Cancel(NSSCMSEncoderContext *p7ecx)
+{
+ SECStatus rv = SECFailure;
+
+ /* XXX do this right! */
+
+ /*
+ * Finish any inner decoders before us so that all the encoded data is flushed
+ * This basically finishes all the decoders from the innermost to the outermost.
+ * Finishing an inner decoder may result in data being updated to the outer decoder
+ * while we are already in NSS_CMSEncoder_Finish, but that's allright.
+ */
+ if (p7ecx->childp7ecx) {
+ rv = NSS_CMSEncoder_Cancel(p7ecx->childp7ecx); /* frees p7ecx->childp7ecx */
+ /* remember rv for now */
+#ifdef CMSDEBUG
+ if (rv != SECSuccess) {
+ fprintf(stderr, "Fail to cancel inner encoder\n");
+ }
+#endif
+ }
+
+ /*
+ * On the way back up, there will be no more data (if we had an
+ * inner encoder, it is done now!)
+ * Flush out any remaining data and/or finish digests.
+ */
+ rv = nss_cms_encoder_work_data(p7ecx, NULL, NULL, 0, PR_TRUE, (p7ecx->childp7ecx == NULL));
+ if (rv != SECSuccess)
+ goto loser;
+
+ p7ecx->childp7ecx = NULL;
+
+ /* kick the encoder back into working mode again.
+ * We turn off streaming stuff (which will cause the encoder to continue
+ * encoding happily, now that we have all the data (like digests) ready for it).
+ */
+ SEC_ASN1EncoderClearTakeFromBuf(p7ecx->ecx);
+ SEC_ASN1EncoderClearStreaming(p7ecx->ecx);
+
+ /* now that TakeFromBuf is off, this will kick this encoder to finish encoding */
+ rv = SEC_ASN1EncoderUpdate(p7ecx->ecx, NULL, 0);
+
+loser:
+ SEC_ASN1EncoderFinish(p7ecx->ecx);
+ PORT_Free(p7ecx);
+ return rv;
+}
+
+/*
+ * NSS_CMSEncoder_Finish - signal the end of data
+ *
+ * we need to walk down the chain of encoders and the finish them from the innermost out
+ */
+SECStatus
+NSS_CMSEncoder_Finish(NSSCMSEncoderContext *p7ecx)
+{
+ SECStatus rv = SECFailure;
+ NSSCMSContentInfo *cinfo;
+
+ /*
+ * Finish any inner decoders before us so that all the encoded data is flushed
+ * This basically finishes all the decoders from the innermost to the outermost.
+ * Finishing an inner decoder may result in data being updated to the outer decoder
+ * while we are already in NSS_CMSEncoder_Finish, but that's allright.
+ */
+ if (p7ecx->childp7ecx) {
+ /* tell the child to start encoding, up to its first data byte, if it
+ * hasn't yet */
+ if (!p7ecx->childp7ecx->ecxupdated) {
+ p7ecx->childp7ecx->ecxupdated = PR_TRUE;
+ rv = SEC_ASN1EncoderUpdate(p7ecx->childp7ecx->ecx, NULL, 0);
+ if (rv != SECSuccess) {
+ NSS_CMSEncoder_Finish(p7ecx->childp7ecx); /* frees p7ecx->childp7ecx */
+ goto loser;
+ }
+ }
+ rv = NSS_CMSEncoder_Finish(p7ecx->childp7ecx); /* frees p7ecx->childp7ecx */
+ if (rv != SECSuccess)
+ goto loser;
+ }
+
+ /*
+ * On the way back up, there will be no more data (if we had an
+ * inner encoder, it is done now!)
+ * Flush out any remaining data and/or finish digests.
+ */
+ rv = nss_cms_encoder_work_data(p7ecx, NULL, NULL, 0, PR_TRUE, (p7ecx->childp7ecx == NULL));
+ if (rv != SECSuccess)
+ goto loser;
+
+ p7ecx->childp7ecx = NULL;
+
+ cinfo = NSS_CMSContent_GetContentInfo(p7ecx->content.pointer, p7ecx->type);
+ if (!cinfo) {
+ /* The original programmer didn't expect this to happen */
+ p7ecx->error = SEC_ERROR_LIBRARY_FAILURE;
+ rv = SECFailure;
+ goto loser;
+ }
+ SEC_ASN1EncoderClearTakeFromBuf(p7ecx->ecx);
+ SEC_ASN1EncoderClearStreaming(p7ecx->ecx);
+ /* now that TakeFromBuf is off, this will kick this encoder to finish encoding */
+ rv = SEC_ASN1EncoderUpdate(p7ecx->ecx, NULL, 0);
+
+ if (p7ecx->error)
+ rv = SECFailure;
+
+loser:
+ SEC_ASN1EncoderFinish(p7ecx->ecx);
+ PORT_Free(p7ecx);
+ return rv;
+}