public void Initialize(BigInteger privateKey, byte[] msghash)
{
_v = Enumerable.Repeat((byte)0x01, 32).ToArray();
_k = Enumerable.Repeat((byte)0x00, 32).ToArray();
var keyBytes = privateKey.ToUByteArray().ToBigEndian();
var prvKey = new byte[32];
Array.Copy(keyBytes, 0, prvKey, 32 - keyBytes.Length, keyBytes.Length);
_k = Hashes.HMACSHA256(_k, _v.Concat(ByteArray.Zero, prvKey, msghash));
_v = Hashes.HMACSHA256(_k, _v);
_k = Hashes.HMACSHA256(_k, _v.Concat(ByteArray.One, prvKey, msghash));
_v = Hashes.HMACSHA256(_k, _v);
}
