public static ExtendedKey Parse(string serialized)
{
byte[] data = Base58Encoding.DecodeWithCheckSum(serialized);
Thrower.Condition <AddressException>(data.Length != 78, "invalid extended key");
using (var stream = new MemoryStream(data))
{
using (var binReader = new BinaryReader(stream))
{
var ext = binReader.ReadBytes(4);
Thrower.Condition <AddressException>(!(ext.SequenceEqual(Xprv) || ext.SequenceEqual(Xpub)), "invalid magic number for an extended key");
var isPrivate = ext.SequenceEqual(Xprv);
var depth = binReader.ReadByte();
var fingerprint = binReader.ReadBytes(4);
var index = BitHelper.ToUInt32(binReader.ReadBytes(4), false);
var chainCode = binReader.ReadBytes(32);
var rawKey = binReader.ReadBytes(33);
BitcoinKey key;
if (isPrivate)
{
key = new BitcoinPrivateKey(rawKey.Skip(1).ToArray());
}
else
{
key = new BitcoinPublicKey(rawKey);
}
return(new ExtendedKey(key, chainCode, depth, fingerprint, index));
}
}
}
/// <summary>
/// The standard of creating an extended key from a given seed.
/// </summary>
public static ExtendedKey Create(byte[] hashKey, byte[] seed)
{
var computedHash = CryptoUtil.ComputeHmac512(hashKey, seed);
var key = new BitcoinPrivateKey(computedHash.Take(32).ToArray());
var chain = computedHash.Skip(32).ToArray();
return(new ExtendedKey(key, chain, 0, BitHelper.GetBytes(0), 0));
}