public static string GetChecksumAddress(string address)
{
// remove prefix 0x
address = ByteUtils.CleanHexPrefix(address);
address = address.ToLower();
// do keccak256 once
var bytes = CryptoUtils.Keccak256(Encoding.UTF8.GetBytes(address));
var builder = new StringBuilder();
var hex = ByteUtils.ToHexString(bytes, null);
var chars = hex.ToCharArray();
int size = address.Length;
var raws = address.ToCharArray();
for (int i = 0; i < size; i++)
{
if (ParseInt(chars[i]) >= 8)
{
builder.Append(("" + raws[i]).ToUpper());
}
else
{
builder.Append(raws[i]);
}
}
return("0x" + builder);
}
public static string BuildSignature(byte[] cert, byte[] txRawHash, string privateKey)
{
var txRawBytes = CryptoUtils.Blake2b(txRawHash);
var cerHexBytes = CryptoUtils.Sha256(cert);
var message = new byte[txRawBytes.Length + cerHexBytes.Length];
Array.Copy(cerHexBytes, 0, message, 0, cerHexBytes.Length);
Array.Copy(txRawBytes, 0, message, cerHexBytes.Length, txRawBytes.Length);
var key = ECKeyPair.Create(ByteUtils.ToByteArray(privateKey));
var signature = ECDSASign.SignMessage(CryptoUtils.Sha256(message), key, false);
var signBytes = signature.ToByteArray();
_logger.Info("signature: {} {}", ByteUtils.ToHexString(signBytes, null),
ByteUtils.CleanHexPrefix(ByteUtils.ToHexString(signature.R, Prefix.ZeroLowerX))
+ ByteUtils.CleanHexPrefix(ByteUtils.ToHexString(signature.S, Prefix.ZeroLowerX)) + "0"
+ signature.V);
return(ByteUtils.ToHexString(signBytes, null));
}
private static string EncodeAddress(string address)
{
if (!StringUtils.IsHex(address))
{
throw new InvalidArgumentException("Parameter format is not hex string");
}
var paramBytes = ByteUtils.ToByteArray(address);
if (paramBytes == null || paramBytes.Length > MAX_BYTE_LENGTH)
{
throw new InvalidArgumentException("Parameter format is hex string size too large, or null");
}
if (paramBytes.Length < MAX_BYTE_LENGTH)
{
var fillingZero = new byte[MAX_BYTE_LENGTH];
Array.Copy(paramBytes, 0, fillingZero, MAX_BYTE_LENGTH - paramBytes.Length, paramBytes.Length);
return(ByteUtils.ToHexString(fillingZero, null));
}
else
{
return(ByteUtils.CleanHexPrefix(address));
}
}