public string AddSignatureToThePost(string post, string guess)
{
var dec_seed = ByteEncryptionUtil.WrappedXor(_encryptedSeed, guess + _publicKey.Stringify());
var privateKey = Ed25519.ExpandedPrivateKeyFromSeed(dec_seed);
var signature = Ed25519.Sign(Encoding.UTF8.GetBytes(post), privateKey);
return(post + "[" + SignatureTag + "=" + signature.Stringify() + "]");
}
public bool CheckGuess(string guess)
{
var dec_seed = ByteEncryptionUtil.WrappedXor(_encryptedSeed, guess + _publicKey.Stringify());
var privateKey = Ed25519.ExpandedPrivateKeyFromSeed(dec_seed);
var dummyMessage = new byte[] { (byte)0 };
var signature = Ed25519.Sign(dummyMessage, privateKey);
return(Ed25519.Verify(signature, dummyMessage, _publicKey));
}