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62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
/*
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* PROJECT: ReactOS Applications Manager
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* LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
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* FILE: base/applications/rapps/integrity.cpp
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* PURPOSE: Various integrity check mechanisms
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* COPYRIGHT: Copyright Ismael Ferreras Morezuelas (swyterzone+ros@gmail.com)
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* Copyright Mark Jansen
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*/
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#include "rapps.h"
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#include <sha1.h>
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BOOL VerifyInteg(LPCWSTR lpSHA1Hash, LPCWSTR lpFileName)
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{
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BOOL ret = FALSE;
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/* first off, does it exist at all? */
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HANDLE file = CreateFileW(lpFileName, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_READONLY, NULL);
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if (file == INVALID_HANDLE_VALUE)
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return FALSE;
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/* let's grab the actual file size to organize the mmap'ing rounds */
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LARGE_INTEGER size;
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GetFileSizeEx(file, &size);
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/* retrieve a handle to map the file contents to memory */
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HANDLE map = CreateFileMappingW(file, NULL, PAGE_READONLY, 0, 0, NULL);
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if (map)
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{
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/* map that thing in address space */
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const unsigned char *file_map = static_cast<const unsigned char *>(MapViewOfFile(map, FILE_MAP_READ, 0, 0, 0));
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if (file_map)
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{
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SHA_CTX ctx;
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/* initialize the SHA-1 context */
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A_SHAInit(&ctx);
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/* feed the data to the cookie monster */
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A_SHAUpdate(&ctx, file_map, size.LowPart);
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/* cool, we don't need this anymore */
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UnmapViewOfFile(file_map);
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/* we're done, compute the final hash */
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ULONG sha[5];
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A_SHAFinal(&ctx, sha);
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WCHAR buf[(sizeof(sha) * 2) + 1];
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for (UINT i = 0; i < sizeof(sha); i++)
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swprintf(buf + 2 * i, L"%02x", ((unsigned char *) sha)[i]);
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/* does the resulting SHA1 match with the provided one? */
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if (!_wcsicmp(buf, lpSHA1Hash))
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ret = TRUE;
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}
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CloseHandle(map);
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}
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CloseHandle(file);
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return ret;
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}
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