public static byte[] DecodeCheck(VersionByte versionByte, string encoded)
{
byte[] decoded = Base32Encoding.ToBytes(encoded);
byte decodedVersionByte = decoded[0];
byte[] payload = new byte[decoded.Length - 2];
Array.Copy(decoded, payload, decoded.Length - 2);
byte[] data = new byte[payload.Length - 1];
Array.Copy(payload, 1, data, 0, payload.Length - 1);
byte[] checksum = new byte[2];
Array.Copy(decoded, decoded.Length - 2, checksum, 0, 2);
if (decodedVersionByte != (byte)versionByte)
{
throw new FormatException("Version byte is invalid");
}
byte[] expectedChecksum = StrKey.CalculateChecksum(payload);
if (!expectedChecksum.IsIdentical(checksum))
{
throw new FormatException("Checksum invalid");
}
return(data);
}
public static string EncodeCheck(VersionByte versionByte, byte[] data)
{
var writer = new ByteWriter();
writer.Write((byte)versionByte);
writer.Write(data);
byte[] checksum = StrKey.CalculateChecksum(writer.ToArray());
writer.Write(checksum);
return(Base32Encoding.ToString(writer.ToArray()));
}
