public static byte[] sha256sum(byte[] key, byte[] message)
{
IMacAlgorithmProvider provider = MacAlgorithmProvider.OpenAlgorithm(MacAlgorithm.HmacSha256);
ICryptographicKey hmacKey = provider.CreateKey(key);
byte [] hmac = CryptographicEngine.Sign(hmacKey, message);
return(hmac);
}
public static bool Verify(byte[] key, byte[] message, byte[] signature)
{
IMacAlgorithmProvider provider = MacAlgorithmProvider.OpenAlgorithm(MacAlgorithm.HmacSha256);
ICryptographicKey hmacKey = provider.CreateKey(key);
return(CryptographicEngine.VerifySignature(hmacKey, message, signature));
}
static string Sign(string stringToSign, string deviceSymmetricKey)
{
IMacAlgorithmProvider algorithm = WinRTCrypto.MacAlgorithmProvider.OpenAlgorithm(MacAlgorithm.HmacSha256);
PCLCrypto.CryptographicHash hash = algorithm.CreateHash(Convert.FromBase64String(deviceSymmetricKey));
hash.Append(Encoding.UTF8.GetBytes(stringToSign));
byte[] mac = hash.GetValueAndReset();
return(Convert.ToBase64String(mac));
}
