public string GetPassphraseHash(byte[] seedguid, int version)
{
//use as seed
string hex = HexString.FromByteArray(seedguid);
byte[] il = HexString.ToByteArray(hex.Substring(0, 64));
byte[] ir = HexString.ToByteArray(hex.Substring(64, 64));
var bip32 = new BIP32(secp256k1);
try
{
bip32.eckey = new ECKeyPair(il,null,false,false,secp256k1);
bip32.eckey.compress(true);
bip32.chain_code = ir;
bip32.child_index = 0;
bip32.parent_fingerprint = HexString.ToByteArray("00000000");
bip32.version = version;
bip32.depth = 0;
bip32.BuildExtendedPublicKey();
bip32.BuildExtendedPrivateKey();
}
catch (Exception ex)
{
}
return bip32.ExtendedPrivateKeyString("base58");
}
public BIP32 DeriveChild(uint i)
{
DateTime start = DateTime.Now;
BIP32 ret = new BIP32(secp256k1);
byte[] ib;
using (MemoryStream ms = new MemoryStream())
using (BinaryWriter bw = new BinaryWriter(ms))
{
bw.Write((byte)((i >> 24) & 0xff));
bw.Write((byte)((i >> 16) & 0xff));
bw.Write((byte)((i >> 8) & 0xff));
bw.Write((byte)(i & 0xff));
ib = ms.ToArray();
}
bool use_private = (i & 0x80000000) != 0;
bool is_private =
(this.version == BITCOIN_MAINNET_PRIVATE ||
this.version == BITCOIN_TESTNET_PRIVATE);
if (use_private && (this.eckey.privKey == null || !is_private)) throw new Exception("Cannot do private key derivation without private key");
if (this.eckey.privKey != null)
{
byte[] data = null;
using (MemoryStream ms = new MemoryStream())
using (BinaryWriter bw = new BinaryWriter(ms))
{
if (use_private)
{
bw.Write((byte)0);
bw.Write(this.eckey.privKey);
bw.Write(ib);
data = ms.ToArray();
}
else
{
//bw.Write((byte)0);
bw.Write(this.eckey.pubKey);
bw.Write(ib);
data = ms.ToArray();
}
}
HMACSHA512 hmacsha = new HMACSHA512(this.chain_code);
byte[] hash = hmacsha.ComputeHash(data);
string hhash = HexString.FromByteArray(hash);
byte[] ir = HexString.ToByteArray(hhash.Substring(64, 64));
string ilb = hhash.Substring(0, 64);
string pkb = HexString.FromByteArray(this.eckey.privKey);
string k = secp256k1.AddPrivate(pkb, ilb);
ret.chain_code = ir;
byte[] derkey = HexString.ToByteArray(k);
if (derkey.Length == 31)
{
List<byte> tmp = derkey.ToList();
tmp.Insert(0, (byte)0);
derkey = tmp.ToArray();
}
ret.eckey = new ECKeyPair(derkey, null, false, false, secp256k1);
ret.eckey.compress(true);
}
else
{
byte[] data = null;
using (MemoryStream ms = new MemoryStream())
using (BinaryWriter bw = new BinaryWriter(ms))
{
if (use_private)
{
bw.Write((byte)0);
bw.Write(this.eckey.privKey);
bw.Write(ib);
data = ms.ToArray();
}
else
{
//bw.Write((byte)3);
bw.Write(this.eckey.pubKey);
bw.Write(ib);
data = ms.ToArray();
}
}
HMACSHA512 hmacsha = new HMACSHA512(this.chain_code);
byte[] hash = hmacsha.ComputeHash(data);
string test = HexString.FromByteArray(hash);
byte[] ir = HexString.ToByteArray(test.Substring(64, 64));
string bil = test.Substring(0, 64);
string bpub = HexString.FromByteArray(this.eckey.pubKey);
string point = secp256k1.AddPublic(bpub, bil);
ret.chain_code = ir;
ret.eckey = new ECKeyPair(null, HexString.ToByteArray(point));
ret.eckey.compress(true);
}
ret.child_index = i;
//this is why we need the pub key hash
//for the fingerprint
start = DateTime.Now;
Address add = new Address(this.eckey.pubKey);
Console.WriteLine("New Address:" + DateTime.Now.Subtract(start).TotalMilliseconds);
ret.parent_fingerprint = add.PubKeyHash.hash.Take(4).ToArray();
ret.version = this.version;
ret.depth = this.depth + 1;
ret.BuildExtendedPublicKey();
ret.BuildExtendedPrivateKey();
return ret;
}