bool MD5(const unsigned char* input, unsigned int inputLen, unsigned char md5Hash[16])
{
	HCRYPTHASH hCryptHash;
	HCRYPTPROV hCryptProv = NULL;

	ZeroMemory(md5Hash, sizeof(md5Hash));

	if (!CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) return false;

	// Select MD5 algorithm.
	if (!CryptCreateHash(hCryptProv, CALG_MD5, NULL, 0, &hCryptHash)) {
		CryptReleaseContext(hCryptProv, 0);
		return false;
	}

	// Really hash the data.
	CryptHashData(hCryptHash, input, inputLen, 0);
	DWORD md5HashLen = 16;
	// Store result into given buffer.
	CryptGetHashParam(hCryptHash, HP_HASHVAL, md5Hash, &md5HashLen, 0);

	CryptReleaseContext(hCryptProv,0);
	return true;
}

// Usage example:
unsigned char md5Result[16] = {0};
char data[] = "hash my data";
MD5((const unsigned char*)data, sizeof(data) - 1, md5Result);
for (int i = 0; i < sizeof(md5Result); i++) {
	printf("%02x", md5Result[i]);
}