public bool isChashValid(string encoded)
{
var encodedLen = encoded.Length;
if (encodedLen != 32 && encodedLen != 48) // 160/5 = 32, 288/6 = 48
{
throw new Exception("wrong encoded length: " + encodedLen);
}
try
{
var chash = encodedLen == 32 ? Base32.Decode(encoded) : Convert.FromBase64String(encoded);
var binChash = buffer2bin(chash);
var separated = SeparateIntoCleanDataAndChecksum(binChash);
var cleanData = bin2buffer(separated.Item1);
var checksum = bin2buffer(separated.Item2);
return(checksum.Equals(getChecksum(cleanData)));
}
catch
{
return(false);
}
}
private string GetChash(string data, int chashLength)
{
CheckLength(chashLength);
var dataBytes = Encoding.UTF8.GetBytes(data);
var hash = createHash(chashLength == 160 ? "ripemd160" : "sha256", dataBytes);
//console.log("hash", hash);
var truncatedHash = chashLength == 160 ? hash.Slice(4) : hash; // drop first 4 bytes if 160
//console.log("clean data", truncated_hash);
var checksum = getChecksum(truncatedHash);
//console.log("checksum", checksum);
//console.log("checksum", buffer2bin(checksum));
var binCleanData = buffer2bin(truncatedHash);
var binChecksum = buffer2bin(checksum);
var binChash = mixChecksumIntoCleanData(binCleanData, binChecksum);
//console.log(binCleanData.length, binChecksum.length, binChash.length);
var chash = bin2buffer(binChash);
//console.log("chash ", chash);
var encoded = chashLength == 160 ? Base32.Encode(chash) : Convert.ToBase64String(chash);
//console.log(encoded);
return(encoded);
}