public void MultipleSignatureWays()
{
var privKeyStr = Encoders.Hex.DecodeData("8e812436a0e3323166e1f0e8ba79e19e217b2c4a53c970d4cca0cfb1078979df");
Key key = new Key(privKeyStr);
Assert.AreEqual("04a5bb3b28466f578e6e93fbfd5f75cee1ae86033aa4bbea690e3312c087181eb366f9a1d1d6a437a9bf9fc65ec853b9fd60fa322be3997c47144eb20da658b3d1", key.PubKey.Decompress().ToHex());
var messageToSign = "159817a085f113d099d3d93c051410e9bfe043cc5c20e43aa9a083bf73660145";
var messageBytes = Encoders.Hex.DecodeData(messageToSign);
ECDSASignature signature = key.Sign(new uint256(messageBytes), true);
SecpECDSASignature.TryCreateFromDer(signature.ToDER(), out SecpECDSASignature sig);
var(r, s) = sig;
var R = r.ToBytes();
var S = s.ToBytes();
Assert.AreEqual("38b7dac5ee932ac1bf2bc62c05b792cd93c3b4af61dc02dbb4b93dacb758123f", R.ToHexString());
Assert.AreEqual("08bf123eabe77480787d664ca280dc1f20d9205725320658c39c6c143fd5642d", S.ToHexString());
// Compact signature
byte[] signatureCompact = key.SignCompact(new uint256(messageBytes), true);
if (signatureCompact.Length != 65)
{
throw new ArgumentException(paramName: nameof(signatureCompact), message: "Signature truncated, expected 65");
}
var ss = signatureCompact.AsSpan();
int recid = (ss[0] - 27) & 3;
if (!(
SecpRecoverableECDSASignature.TryCreateFromCompact(ss.Slice(1), recid, out SecpRecoverableECDSASignature sigR) && sigR is SecpRecoverableECDSASignature
)
)
{
throw new InvalidOperationException("Impossible to recover the public key");
}
// V from comapct signature
var(r1, s1, v1) = sigR;
Assert.AreEqual(v1, 0);
// Recoverable signature with Secp256k1 lib
NBitcoin.Secp256k1.ECPrivKey privKey = Context.Instance.CreateECPrivKey(new Scalar(key.ToBytes()));
Assert.AreEqual(key.PubKey.ToBytes(), privKey.CreatePubKey().ToBytes());
privKey.TrySignRecoverable(messageBytes, out SecpRecoverableECDSASignature sigRec);
var(r2, s2, v2) = sigRec;
Assert.AreEqual(r2, r);
Assert.AreEqual(s2, s);
Assert.AreEqual(v2, v1);
}
public void CreatePubKey()
{
Console.WriteLine();
uint256 N = uint256.Parse("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141");
Random rand = new Random();
byte[] privateKey = new byte[32];
uint256 candidateKey;
do
{
rand.NextBytes(privateKey);
candidateKey = new uint256(privateKey, false);
} while (!(candidateKey > 0 && candidateKey < N));
// Public key
privateKey = Encoders.Hex.DecodeData("da7639a9e2ed4e918b57151509ee34b3f80ad4ab60fb52de59cc3a7386b19007");
NBitcoin.Secp256k1.ECPrivKey privKey = Context.Instance.CreateECPrivKey(new Scalar(privateKey));
ECPubKey pubKey = privKey.CreatePubKey();
byte[] pubKeyBytes = pubKey.ToBytes();
// Console.WriteLine($"Pub key : {Encoders.Hex.EncodeData(pubKeyBytes)}");
var x = pubKey.Q.x.ToBytes();
var y = pubKey.Q.y.ToBytes();
Console.WriteLine($"Pub key x : {Encoders.Hex.EncodeData(x)}");
Console.WriteLine($"Pub key y : {string.Empty.PadLeft(16, '\t')}{Encoders.Hex.EncodeData(y)}");
var pubKeyUncomp = Helper.Concat(new byte[] { (04) }, x, y);
Console.WriteLine($"Pub key (uncomp.) : {Encoders.Hex.EncodeData(pubKeyUncomp)}");
BigInteger yBig = new BigInteger(y, isUnsigned: true, isBigEndian: true);
byte pubKeyPrefix = (byte)(yBig % 2 == 0 ? 02 : 03);
var pubKeyComp = Helper.Concat(new byte[] { pubKeyPrefix }, x);
Console.WriteLine($"Pub key (comp.) : {Encoders.Hex.EncodeData(pubKeyComp)}");
Assert.AreEqual(pubKeyBytes, pubKeyComp);
}
public void ShouldEncodeAddress()
{
var privateKey = Encoders.Hex.DecodeData("08089C24EC3BAEB34254DDF5297CF8FBB8E031496FF67B4EFACA738FF9EBD455");
NBitcoin.Secp256k1.ECPrivKey privKey = Context.Instance.CreateECPrivKey(new Scalar(privateKey));
ECPubKey pubKey = privKey.CreatePubKey();
var x = pubKey.Q.x.ToBytes();
var y = pubKey.Q.y.ToBytes();
var pubKeyUncomp = Helper.Concat(x, y);
Assert.AreEqual(
"ee63599802b5d31a29c95cc7df04f427e8f0a124bed9333f3a80404acfc3127659c540d0162dedb81ac5f74b2deb4962656efe112b252e54ac3ba1207cd1fb10",
Encoders.Hex.EncodeData(pubKeyUncomp)
);
var pubKeyHash = new Sha3Keccack().CalculateHash(pubKeyUncomp);
Assert.AreEqual("0837725ba59e30e8e52ba5ab95679f3aaf5211991781d49b30525dddfe9a18de", pubKeyHash.ToHexString());
var sha3HashBytes = new byte[20];
Array.Copy(pubKeyHash, pubKeyHash.Length - 20, sha3HashBytes, 0, 20);
byte[] PKHWithVersionBytes = Helper.Concat(new byte[] { 65 }, sha3HashBytes);
var hexAddress = PKHWithVersionBytes.ToHexString();
Assert.AreEqual("4195679F3AAF5211991781D49B30525DDDFE9A18DE".ToLower(), hexAddress);
var result = Encoders.Base58Check.EncodeData(PKHWithVersionBytes);
Assert.AreEqual(
"TPbBpRXnt6ztse8XkCLiJstZyqQZvxW2sx",
result
);
}
public void CreateAddress()
{
Console.WriteLine();
// Priv key length
int KEY_SIZE = 32;
// Max priv key value
// 115792089237316195423570985008687907852837564279074904382605163141518161494337
uint256 N = uint256.Parse("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141");
// Randomizer
Random rand = new Random();
byte[] privateKey = new byte[KEY_SIZE];
// Generate a valid random value
uint256 candidateKey;
do
{
rand.NextBytes(privateKey);
candidateKey = new uint256(privateKey, false);
} while (!(candidateKey > 0 && candidateKey < N));
Console.WriteLine($"Private key (hex) : { Encoders.Hex.EncodeData(privateKey) }");
// base58 encoded private key
byte[] privKeyWithVersionBytes = Helper.Concat(new byte[] { 128 }, privateKey);
string privKeyBase58 = Encoders.Base58Check.EncodeData(privKeyWithVersionBytes);
Console.WriteLine($"Priv. key (Base58) : {privKeyBase58}");
// base58 encoded compressed private key
byte[] compPrivKeyWithVersionBytes = Helper.Concat(privKeyWithVersionBytes, new byte[] { 01 });
var compPrivKeyBase58 = Encoders.Base58Check.EncodeData(compPrivKeyWithVersionBytes);
Console.WriteLine($"Priv. key (Base58) : {compPrivKeyBase58} (Compressed)");
// Elliptic curve multiplication (with help of NBitcoin)
// privateKey = Encoders.Hex.DecodeData("da7639a9e2ed4e918b57151509ee34b3f80ad4ab60fb52de59cc3a7386b19007"); // for testing
NBitcoin.Secp256k1.ECPrivKey privKey = Context.Instance.CreateECPrivKey(new Scalar(privateKey));
ECPubKey pubKey = privKey.CreatePubKey();
// X, Y
var x = pubKey.Q.x.ToBytes();
var y = pubKey.Q.y.ToBytes();
// Uncompressed public key
var pubKeyUncomp = Helper.Concat(new byte[] { (04) }, x, y);
Console.WriteLine($"Pub key (uncomp.) : {Encoders.Hex.EncodeData(pubKeyUncomp)}");
// Compressed public key
BigInteger yBig = new BigInteger(y, isUnsigned: true, isBigEndian: true);
var pubKeyComp = Helper.Concat(new byte[] { (byte)(yBig % 2 == 0 ? 02 : 03) }, x);
Console.WriteLine($"Pub key (comp.) : {Encoders.Hex.EncodeData(pubKeyComp)}");
//// Uncompressed Public Key
// Public key hash (pkh)
var pubKeyHash = NBitcoin.Crypto.Hashes.SHA256(pubKeyUncomp);
var pubKeyHash160 = NBitcoin.Crypto.Hashes.RIPEMD160(pubKeyHash, pubKeyHash.Length);
Console.WriteLine($"Public key hash : {Encoders.Hex.EncodeData(pubKeyHash160)}");
// base58 encoded pkh : address
byte[] PKHWithVersionBytes = Helper.Concat(new byte[] { 00 }, pubKeyHash160);
var address = Encoders.Base58Check.EncodeData(PKHWithVersionBytes);
Assert.DoesNotThrow(() => {
BitcoinAddress.Create(str: address, Network.Main);
});
Console.WriteLine($"Address : {address}");
//// Uncompressed Public Key (w/ checksum calculation)
var hash1 = NBitcoin.Crypto.Hashes.SHA256(PKHWithVersionBytes);
var hash2 = NBitcoin.Crypto.Hashes.SHA256(hash1);
var checksum = hash2.Take(4).ToArray();
var pkhWithChecksum = Helper.Concat(PKHWithVersionBytes, checksum);
var address1 = Encoders.Base58.EncodeData(pkhWithChecksum);
Assert.AreEqual(address, address1);
//// Compressed Public Key
// Public key hash (Compressed)
var pubKeyCompHash = NBitcoin.Crypto.Hashes.SHA256(pubKeyComp);
var pubKeyCompHash160 = NBitcoin.Crypto.Hashes.RIPEMD160(pubKeyCompHash, pubKeyCompHash.Length);
// base58 encoded compressed pkh : address
byte[] compPKHWithVersionBytes = Helper.Concat(new byte[] { 00 }, pubKeyCompHash160);
var addressComp = Encoders.Base58Check.EncodeData(compPKHWithVersionBytes);
Assert.DoesNotThrow(() => {
BitcoinAddress.Create(str: addressComp, Network.Main);
});
Console.WriteLine($"Address (Comp.) : {addressComp}");
}
