/**
* @brief MD5 HASH digest compute example.
* @param InputMessage: pointer to input message to be hashed.
* @param InputMessageLength: input data message length in byte.
* @param MessageDigest: pointer to output parameter that will handle message digest
* @param MessageDigestLength: pointer to output digest length.
* @retval error status: can be HASH_SUCCESS if success or one of
* HASH_ERR_BAD_PARAMETER, HASH_ERR_BAD_CONTEXT,
* HASH_ERR_BAD_OPERATION if error occured.
*/
int32_t STM32_MD5_HASH_DigestCompute(uint8_t* InputMessage, uint32_t InputMessageLength,
uint8_t *MessageDigest, int32_t* MessageDigestLength)
{
MD5ctx_stt P_pMD5ctx;
uint32_t error_status = HASH_SUCCESS;
/* Set the size of the desired hash digest */
P_pMD5ctx.mTagSize = CRL_MD5_SIZE;
/* Set flag field to default value */
P_pMD5ctx.mFlags = E_HASH_DEFAULT;
error_status = MD5_Init(&P_pMD5ctx);
/* check for initialization errors */
if (error_status == HASH_SUCCESS)
{
/* Add data to be hashed */
error_status = MD5_Append(&P_pMD5ctx,
InputMessage,
InputMessageLength);
if (error_status == HASH_SUCCESS)
{
/* retrieve */
error_status = MD5_Finish(&P_pMD5ctx, MessageDigest, MessageDigestLength);
}
}
return error_status;
}
BOOL WINAPI SFileVerifyFile(HANDLE hMpq, const char * szFileName, DWORD dwFlags)
{
crc32_context crc32_ctx;
md5_context md5_ctx;
TMPQFile * hf;
TMPQCRC32 Crc32;
TMPQMD5 Md5;
BYTE Buffer[0x1000];
HANDLE hFile = NULL;
DWORD dwBytesRead;
BOOL bResult = TRUE;
// Attempt to open the file
if(SFileOpenFileEx(hMpq, szFileName, 0, &hFile))
{
// Initialize the CRC32 and MD5 counters
CRC32_Init(&crc32_ctx);
MD5_Init(&md5_ctx);
hf = (TMPQFile *)hFile;
// Go through entire file and update both CRC32 and MD5
for(;;)
{
// Read data from file
SFileReadFile(hFile, Buffer, sizeof(Buffer), &dwBytesRead, NULL);
if(dwBytesRead == 0)
break;
// Update CRC32 value
if(dwFlags & MPQ_ATTRIBUTE_CRC32)
CRC32_Update(&crc32_ctx, Buffer, (int)dwBytesRead);
// Update MD5 value
if(dwFlags & MPQ_ATTRIBUTE_MD5)
MD5_Update(&md5_ctx, Buffer, (int)dwBytesRead);
}
// Check if the CRC32 matches
if((dwFlags & MPQ_ATTRIBUTE_CRC32) && hf->pCrc32 != NULL)
{
CRC32_Finish(&crc32_ctx, (unsigned long *)&Crc32.dwValue);
if(Crc32.dwValue != hf->pCrc32->dwValue)
bResult = FALSE;
}
// Check if MD5 matches
if((dwFlags & MPQ_ATTRIBUTE_MD5) && hf->pMd5 != NULL)
{
MD5_Finish(&md5_ctx, Md5.Value);
if(memcmp(Md5.Value, hf->pMd5->Value, sizeof(TMPQMD5)))
bResult = FALSE;
}
SFileCloseFile(hFile);
}
return bResult;
}
