зеркало из https://github.com/mozilla/gecko-dev.git
140 строки
3.9 KiB
C++
140 строки
3.9 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <windows.h>
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#include <wincrypt.h>
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#include "pathhash.h"
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/**
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* Converts a binary sequence into a hex string
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*
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* @param hash The binary data sequence
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* @param hashSize The size of the binary data sequence
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* @param hexString A buffer to store the hex string, must be of
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* size 2 * @hashSize
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*/
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static void
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BinaryDataToHexString(const BYTE *hash, DWORD &hashSize,
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LPWSTR hexString)
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{
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WCHAR *p = hexString;
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for (DWORD i = 0; i < hashSize; ++i) {
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wsprintfW(p, L"%.2x", hash[i]);
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p += 2;
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}
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}
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/**
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* Calculates an MD5 hash for the given input binary data
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*
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* @param data Any sequence of bytes
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* @param dataSize The number of bytes inside @data
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* @param hash Output buffer to store hash, must be freed by the caller
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* @param hashSize The number of bytes in the output buffer
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* @return TRUE on success
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*/
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static BOOL
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CalculateMD5(const char *data, DWORD dataSize,
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BYTE **hash, DWORD &hashSize)
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{
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HCRYPTPROV hProv = 0;
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HCRYPTHASH hHash = 0;
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if (!CryptAcquireContext(&hProv, nullptr, nullptr, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT)) {
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if ((DWORD)NTE_BAD_KEYSET != GetLastError()) {
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return FALSE;
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}
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// Maybe it doesn't exist, try to create it.
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if (!CryptAcquireContext(&hProv, nullptr, nullptr, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT | CRYPT_NEWKEYSET)) {
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return FALSE;
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}
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}
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if (!CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash)) {
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return FALSE;
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}
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if (!CryptHashData(hHash, reinterpret_cast<const BYTE*>(data),
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dataSize, 0)) {
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return FALSE;
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}
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DWORD dwCount = sizeof(DWORD);
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if (!CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE *)&hashSize,
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&dwCount, 0)) {
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return FALSE;
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}
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*hash = new BYTE[hashSize];
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ZeroMemory(*hash, hashSize);
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if (!CryptGetHashParam(hHash, HP_HASHVAL, *hash, &hashSize, 0)) {
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return FALSE;
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}
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if (hHash) {
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CryptDestroyHash(hHash);
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}
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if (hProv) {
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CryptReleaseContext(hProv,0);
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}
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return TRUE;
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}
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/**
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* Converts a file path into a unique registry location for cert storage
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*
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* @param filePath The input file path to get a registry path from
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* @param registryPath A buffer to write the registry path to, must
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* be of size in WCHARs MAX_PATH + 1
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* @return TRUE if successful
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*/
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BOOL
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CalculateRegistryPathFromFilePath(const LPCWSTR filePath,
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LPWSTR registryPath)
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{
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size_t filePathLen = wcslen(filePath);
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if (!filePathLen) {
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return FALSE;
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}
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// If the file path ends in a slash, ignore that character
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if (filePath[filePathLen -1] == L'\\' ||
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filePath[filePathLen - 1] == L'/') {
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filePathLen--;
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}
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// Copy in the full path into our own buffer.
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// Copying in the extra slash is OK because we calculate the hash
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// based on the filePathLen which excludes the slash.
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// +2 to account for the possibly trailing slash and the null terminator.
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WCHAR *lowercasePath = new WCHAR[filePathLen + 2];
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memset(lowercasePath, 0, (filePathLen + 2) * sizeof(WCHAR));
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wcsncpy(lowercasePath, filePath, filePathLen + 1);
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_wcslwr(lowercasePath);
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BYTE *hash;
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DWORD hashSize = 0;
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if (!CalculateMD5(reinterpret_cast<const char*>(lowercasePath),
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filePathLen * 2,
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&hash, hashSize)) {
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delete[] lowercasePath;
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return FALSE;
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}
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delete[] lowercasePath;
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LPCWSTR baseRegPath = L"SOFTWARE\\Mozilla\\"
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L"MaintenanceService\\";
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wcsncpy(registryPath, baseRegPath, MAX_PATH);
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BinaryDataToHexString(hash, hashSize,
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registryPath + wcslen(baseRegPath));
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delete[] hash;
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return TRUE;
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}
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