public byte[] GetRegistrationTokenBytes(RsaKey rsaKey, BitcoinSecret privateKeyEcdsa)
{
var token = new List <byte>();
token.AddRange(Encoding.ASCII.GetBytes(ServerId.PadRight(34)));
if (Ipv4Addr != null)
{
token.AddRange(Ipv4Addr.GetAddressBytes());
}
else
{
token.Add(0x00); token.Add(0x00); token.Add(0x00); token.Add(0x00);
}
if (Ipv6Addr != null)
{
token.AddRange(Ipv6Addr.GetAddressBytes());
}
else
{
token.Add(0x00); token.Add(0x00); token.Add(0x00); token.Add(0x00);
token.Add(0x00); token.Add(0x00); token.Add(0x00); token.Add(0x00);
token.Add(0x00); token.Add(0x00); token.Add(0x00); token.Add(0x00);
token.Add(0x00); token.Add(0x00); token.Add(0x00); token.Add(0x00);
}
if (OnionAddress != null)
{
token.AddRange(Encoding.ASCII.GetBytes(OnionAddress));
}
else
{
token.Add(0x00); token.Add(0x00); token.Add(0x00); token.Add(0x00);
token.Add(0x00); token.Add(0x00); token.Add(0x00); token.Add(0x00);
token.Add(0x00); token.Add(0x00); token.Add(0x00); token.Add(0x00);
token.Add(0x00); token.Add(0x00); token.Add(0x00); token.Add(0x00);
}
// TODO: Review the use of BitConverter for endian-ness issues
byte[] portNumber = BitConverter.GetBytes(Port);
token.Add(portNumber[0]);
token.Add(portNumber[1]);
CryptoUtils cryptoUtils = new CryptoUtils(rsaKey, privateKeyEcdsa);
// Sign header (excluding preliminary length marker bytes) with RSA
RsaSignature = cryptoUtils.SignDataRSA(token.ToArray());
byte[] rsaLength = BitConverter.GetBytes(RsaSignature.Length);
// Sign header (excluding preliminary length marker bytes) with ECDSA
EcdsaSignature = cryptoUtils.SignDataECDSA(token.ToArray());
byte[] ecdsaLength = BitConverter.GetBytes(EcdsaSignature.Length);
// TODO: Check if the lengths are >2 bytes. Should not happen
// for most conceivable signature schemes at current key lengths
token.Add(rsaLength[0]);
token.Add(rsaLength[1]);
token.AddRange(RsaSignature);
token.Add(ecdsaLength[0]);
token.Add(ecdsaLength[1]);
token.AddRange(EcdsaSignature);
// Server configuration hash
token.AddRange(Encoding.ASCII.GetBytes(ConfigurationHash));
// Finally add protocol byte and computed length to beginning of header
byte[] protocolVersionByte = BitConverter.GetBytes(ProtocolVersion);
byte[] headerLength = BitConverter.GetBytes(token.Count);
token.Insert(0, protocolVersionByte[0]);
token.Insert(1, headerLength[0]);
token.Insert(2, headerLength[1]);
return(token.ToArray());
}