static string GenerateWif(string passphrase, Network network, LotSequence lotsequence, byte[] ownersalt)
{
var hasLotSequence = lotsequence != null;
//ownersalt is 8 random bytes
ownersalt = ownersalt ?? RandomUtils.GetBytes(8);
var ownerEntropy = ownersalt;
if (hasLotSequence)
{
ownersalt = ownersalt.Take(4).ToArray();
ownerEntropy = ownersalt.Concat(lotsequence.ToBytes()).ToArray();
}
var prefactor = SCrypt.BitcoinComputeDerivedKey(Encoding.UTF8.GetBytes(passphrase), ownersalt, 32);
var passfactor = prefactor;
if (hasLotSequence)
{
passfactor = Hashes.Hash256(prefactor.Concat(ownerEntropy).ToArray()).ToBytes();
}
var passpoint = new Key(passfactor).PubKey.ToBytes();
var bytes =
network.GetVersionBytes(Base58Type.PASSPHRASE_CODE, true)
.Concat(new[] { hasLotSequence ? (byte)0x51 : (byte)0x53 })
.Concat(ownerEntropy)
.Concat(passpoint)
.ToArray();
return(Encoders.Base58Check.EncodeData(bytes));
}
internal static byte[] CalculatePassFactor(string password, LotSequence lotSequence, byte[] ownerEntropy)
{
byte[] passfactor;
if (lotSequence == null)
{
passfactor = SCrypt.BitcoinComputeDerivedKey(Encoding.UTF8.GetBytes(password), ownerEntropy, 32);
}
else
{
var ownersalt = ownerEntropy.SafeSubarray(0, 4);
var prefactor = SCrypt.BitcoinComputeDerivedKey(Encoding.UTF8.GetBytes(password), ownersalt, 32);
passfactor = Hashes.Hash256(prefactor.Concat(ownerEntropy).ToArray()).ToBytes();
}
return(passfactor);
}
public BitcoinPassphraseCode(string passphrase, Network network, LotSequence lotsequence,
byte[] ownersalt = null)
: base(GenerateWif(passphrase, network, lotsequence, ownersalt), network)
{
}
