bool Verify()
{
var s = _Static;
var message = $"{s.prevMinerId}{s.minerId}{s.vctx.txid}";
var verifyHash = KzHashes.SHA256(message.UTF8ToBytes());
var verifySignature = s.prevMinerIdSig.HexToBytes();
PrevPubKeyBytes = s.prevMinerId.HexToBytes();
PrevPubKey = new KzPubKey(PrevPubKeyBytes);
var verified = PrevPubKey.IsValid && PrevPubKey.Verify(verifyHash, verifySignature);
if (verified)
{
PubKeyBytes = s.minerId.HexToBytes();
PubKey = new KzPubKey(PubKeyBytes);
verified = PubKey.IsValid;
}
return(verified);
}
/// <summary>
/// The checksum is a substring of the binary representation of the SHA256 hash of entropy.
/// For every four bytes of entropy, one additional bit of the hash is used.
/// </summary>
/// <param name="entropy"></param>
/// <returns></returns>
public static string GetChecksum(ReadOnlySequence <byte> entropy)
{
var hash = KzHashes.SHA256(entropy);
var bits = (int)entropy.Length * 8;
var cs = bits / 32;
var sb = new StringBuilder();
foreach (var b in hash.Span)
{
sb.Append(Convert.ToString(b, 2).PadLeft(8, '0'));
cs -= 8;
if (cs <= 0)
{
break;
}
}
if (cs < 0)
{
sb.Length += cs;
}
return(sb.ToString());
}
static KzUInt256 GetMessageHash(ReadOnlySpan <byte> message)
{
var messagehash = KzHashes.SHA256(message).ToHex();
return(new KzWriterHash().Add(_messageMagic).Add(messagehash).GetHashFinal());
}