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-rw-r--r--toolkit/mozapps/update/common/pathhash.cpp139
1 files changed, 139 insertions, 0 deletions
diff --git a/toolkit/mozapps/update/common/pathhash.cpp b/toolkit/mozapps/update/common/pathhash.cpp
new file mode 100644
index 000000000..89a004cde
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+++ b/toolkit/mozapps/update/common/pathhash.cpp
@@ -0,0 +1,139 @@
+/* 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 <windows.h>
+#include <wincrypt.h>
+#include "pathhash.h"
+
+
+/**
+ * Converts a binary sequence into a hex string
+ *
+ * @param hash The binary data sequence
+ * @param hashSize The size of the binary data sequence
+ * @param hexString A buffer to store the hex string, must be of
+ * size 2 * @hashSize
+*/
+static void
+BinaryDataToHexString(const BYTE *hash, DWORD &hashSize,
+ LPWSTR hexString)
+{
+ WCHAR *p = hexString;
+ for (DWORD i = 0; i < hashSize; ++i) {
+ wsprintfW(p, L"%.2x", hash[i]);
+ p += 2;
+ }
+}
+
+/**
+ * Calculates an MD5 hash for the given input binary data
+ *
+ * @param data Any sequence of bytes
+ * @param dataSize The number of bytes inside @data
+ * @param hash Output buffer to store hash, must be freed by the caller
+ * @param hashSize The number of bytes in the output buffer
+ * @return TRUE on success
+*/
+static BOOL
+CalculateMD5(const char *data, DWORD dataSize,
+ BYTE **hash, DWORD &hashSize)
+{
+ HCRYPTPROV hProv = 0;
+ HCRYPTHASH hHash = 0;
+
+ if (!CryptAcquireContext(&hProv, nullptr, nullptr, PROV_RSA_FULL,
+ CRYPT_VERIFYCONTEXT)) {
+ if (NTE_BAD_KEYSET != GetLastError()) {
+ return FALSE;
+ }
+
+ // Maybe it doesn't exist, try to create it.
+ if (!CryptAcquireContext(&hProv, nullptr, nullptr, PROV_RSA_FULL,
+ CRYPT_VERIFYCONTEXT | CRYPT_NEWKEYSET)) {
+ return FALSE;
+ }
+ }
+
+ if (!CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash)) {
+ return FALSE;
+ }
+
+ if (!CryptHashData(hHash, reinterpret_cast<const BYTE*>(data),
+ dataSize, 0)) {
+ return FALSE;
+ }
+
+ DWORD dwCount = sizeof(DWORD);
+ if (!CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE *)&hashSize,
+ &dwCount, 0)) {
+ return FALSE;
+ }
+
+ *hash = new BYTE[hashSize];
+ ZeroMemory(*hash, hashSize);
+ if (!CryptGetHashParam(hHash, HP_HASHVAL, *hash, &hashSize, 0)) {
+ return FALSE;
+ }
+
+ if (hHash) {
+ CryptDestroyHash(hHash);
+ }
+
+ if (hProv) {
+ CryptReleaseContext(hProv,0);
+ }
+
+ return TRUE;
+}
+
+/**
+ * Converts a file path into a unique registry location for cert storage
+ *
+ * @param filePath The input file path to get a registry path from
+ * @param registryPath A buffer to write the registry path to, must
+ * be of size in WCHARs MAX_PATH + 1
+ * @return TRUE if successful
+*/
+BOOL
+CalculateRegistryPathFromFilePath(const LPCWSTR filePath,
+ LPWSTR registryPath)
+{
+ size_t filePathLen = wcslen(filePath);
+ if (!filePathLen) {
+ return FALSE;
+ }
+
+ // If the file path ends in a slash, ignore that character
+ if (filePath[filePathLen -1] == L'\\' ||
+ filePath[filePathLen - 1] == L'/') {
+ filePathLen--;
+ }
+
+ // Copy in the full path into our own buffer.
+ // Copying in the extra slash is OK because we calculate the hash
+ // based on the filePathLen which excludes the slash.
+ // +2 to account for the possibly trailing slash and the null terminator.
+ WCHAR *lowercasePath = new WCHAR[filePathLen + 2];
+ memset(lowercasePath, 0, (filePathLen + 2) * sizeof(WCHAR));
+ wcsncpy(lowercasePath, filePath, filePathLen + 1);
+ _wcslwr(lowercasePath);
+
+ BYTE *hash;
+ DWORD hashSize = 0;
+ if (!CalculateMD5(reinterpret_cast<const char*>(lowercasePath),
+ filePathLen * 2,
+ &hash, hashSize)) {
+ delete[] lowercasePath;
+ return FALSE;
+ }
+ delete[] lowercasePath;
+
+ LPCWSTR baseRegPath = L"SOFTWARE\\Mozilla\\"
+ L"MaintenanceService\\";
+ wcsncpy(registryPath, baseRegPath, MAX_PATH);
+ BinaryDataToHexString(hash, hashSize,
+ registryPath + wcslen(baseRegPath));
+ delete[] hash;
+ return TRUE;
+}