public byte[] TestHMac(HandshakeHashType algorithm, byte[] key, byte[] data)
{
var hmac = HMac.Create(algorithm, SecureBuffer.CreateCopy(key));
hmac.Reset();
hmac.TransformBlock(data, 0, data.Length);
var output = new byte [hmac.MacSize];
hmac.TransformFinalBlock(output, 0, output.Length);
return(output);
}