md5hash.cpp

bool PatchManager::GetMD5(const u8 *pBuffer, u32 uBufLen, u8 *rgbHash)
{
	BOOL bResult = FALSE;
	HCRYPTPROV hProv = 0;
	HCRYPTHASH hHash = 0;
	DWORD cbRead = 0;
	DWORD cbHash = 0;
	CHAR rgbDigits[] = "0123456789ABCDEF";

	// Get handle to the crypto provider
	if (!CryptAcquireContext(&hProv,
		NULL,
		NULL,
		PROV_RSA_FULL,
		CRYPT_VERIFYCONTEXT))
	{
		return false;
	}

	if (!CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash))
	{
		CryptReleaseContext(hProv, 0);
		return false;
	}

	u32 uIdx = 0;
	while (uIdx < uBufLen)
	{
		u32 cbRead = 1024;
		if (uIdx + cbRead > uBufLen)
		{
			cbRead = uBufLen - uIdx;
		}
		if (!CryptHashData(hHash, pBuffer + uIdx, cbRead, 0))
		{
			CryptReleaseContext(hProv, 0);
			CryptDestroyHash(hHash);
			return false;
		}
		uIdx += cbRead;
	}

	cbHash = 16;

	if (CryptGetHashParam(hHash, HP_HASHVAL, rgbHash, &cbHash, 0))
	{
		bResult = TRUE;
	}

	CryptDestroyHash(hHash);
	CryptReleaseContext(hProv, 0);

	return bResult; 
}