Ternick

std::string WinMD5(const void * data, const size_t data_size)
{
    HCRYPTPROV hProv = NULL;

    if (!CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) {
        return std::string();
    }

    HCRYPTPROV hHash = NULL;
    BOOL hash_ok = CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash);
   

    if (!hash_ok) {
        CryptReleaseContext(hProv, 0);
        return std::string();
    }

    if (!CryptHashData(hHash, static_cast<const BYTE *>(data), static_cast<DWORD>(data_size), 0)) {
        CryptDestroyHash(hHash);
        CryptReleaseContext(hProv, 0);
        return std::string();
    }

    DWORD cbHashSize = 0, dwCount = sizeof(DWORD);
    if (!CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE *)&cbHashSize, &dwCount, 0)) {
        CryptDestroyHash(hHash);
        CryptReleaseContext(hProv, 0);
        return std::string();
    }

    std::vector<BYTE> buffer(cbHashSize);
    if (!CryptGetHashParam(hHash, HP_HASHVAL, reinterpret_cast<BYTE*>(&buffer[0]), &cbHashSize, 0)) {
        CryptDestroyHash(hHash);
        CryptReleaseContext(hProv, 0);
        return std::string();
    }

    std::ostringstream oss;

    for (auto item: buffer) {
        oss << static_cast<unsigned int>(item);
    }

    CryptDestroyHash(hHash);
    CryptReleaseContext(hProv, 0);
    return oss.str();
}

string ToBytes(const wstring& str) {
    const char* d = reinterpret_cast<const char*>(&str[0]);
    string result(d, d+str.size()*2);
    return result;
}


int main() {
    wstring data = L"876c0e09-70f7-4190-ab3a-254b6e5f461e";
    cout << WinMD5(data.data(), data.size()* sizeof(wchar_t));
    system("pause");
}