// https://stackoverflow.com/questions/17439732/recreating-keys-ecpublickeyparameters-in-c-sharp-with-bouncycastle
// TODO: find curve name...
private static Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters CreateEcPublicKeyParameters(
Org.BouncyCastle.Math.BigInteger xx
, Org.BouncyCastle.Math.BigInteger yy)
{
// Org.BouncyCastle.Math.EC.ECPoint q = new Org.BouncyCastle.Math.EC.ECPoint(x, y);
// Org.BouncyCastle.Crypto.Tls.NamedCurve.secp224k1
// DefineCurveAlias("P-256", SecObjectIdentifiers.SecP256r1); // Alg 13
// DefineCurveAlias("P-384", SecObjectIdentifiers.SecP384r1); // Alg 14
// DefineCurveAlias("P-521", SecObjectIdentifiers.SecP521r1);
string curveName = "P-521";
Org.BouncyCastle.Asn1.X9.X9ECParameters ecP = Org.BouncyCastle.Asn1.Nist.NistNamedCurves.GetByName(curveName);
Org.BouncyCastle.Math.EC.FpCurve c = (Org.BouncyCastle.Math.EC.FpCurve)ecP.Curve;
Org.BouncyCastle.Math.EC.ECFieldElement x = c.FromBigInteger(xx);
Org.BouncyCastle.Math.EC.ECFieldElement y = c.FromBigInteger(yy);
Org.BouncyCastle.Math.EC.ECPoint q = new Org.BouncyCastle.Math.EC.FpPoint(c, x, y);
Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters publicParams = null;
// Org.BouncyCastle.Crypto.Parameters.ECKeyParameters publicParams = new Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters(q, domain);
// Org.BouncyCastle.Crypto.AsymmetricKeyParameter publicParams = new Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters(q, domain);
// Org.BouncyCastle.Crypto.ICipherParameters publicParams = new Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters(q, domain);
// Org.BouncyCastle.Crypto.Digests.GeneralDigest.
// Org.BouncyCastle.Crypto.Signers.GenericSigner
// Org.BouncyCastle.Crypto.Generators.ECKeyPairGenerator
// Org.BouncyCastle.Security.SignerUtilities.GetSigner("SHA-384withRSA");
// Org.BouncyCastle.Security.DigestUtilities.GetDigest("");
// Org.BouncyCastle.Security.CipherUtilities.GetCipher("");
// Org.BouncyCastle.Security.GeneratorUtilities.GetKeyGenerator("");
// Org.BouncyCastle.Security.WrapperUtilities.GetAlgorithmName
// Org.BouncyCastle.Security.MacUtilities.CalculateMac("", null, System.Text.Encoding.UTF8.GetBytes("HashThis"));
// Org.BouncyCastle.Security.ParameterUtilities.CreateKeyParameter("name", new byte[] { });
// Org.BouncyCastle.Security.ParameterUtilities.GenerateParameters("name", new Org.BouncyCastle.Security.SecureRandom());
// Org.BouncyCastle.Security.PublicKeyFactory.CreateKey()
// Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters oara = new Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters("ECDH", q, Org.BouncyCastle.Asn1.Sec.SecObjectIdentifiers.SecP521r1);
return(publicParams);
}
public PubKey Derivate(byte[] cc, uint nChild, out byte[] ccChild)
{
byte[] lr = null;
byte[] l = new byte[32];
byte[] r = new byte[32];
if ((nChild >> 31) == 0)
{
var pubKey = ToBytes();
lr = Hashes.BIP32Hash(cc, nChild, pubKey[0], pubKey.Skip(1).ToArray());
}
else
{
throw new InvalidOperationException("Impossible to derivate a child key from a hardened one");
}
Array.Copy(lr, l, 32);
Array.Copy(lr, 32, r, 0, 32);
ccChild = r;
BigInteger N = ECKey.CURVE.N;
BigInteger kPar = new BigInteger(1, this.vch);
BigInteger parse256LL = new BigInteger(1, l);
if (parse256LL.CompareTo(N) >= 0)
{
throw new InvalidOperationException("You won a prize ! this should happen very rarely. Take a screenshot, and roll the dice again.");
}
var q = ECKey.CURVE.G.Multiply(parse256LL).Add(_Key.GetPublicKeyParameters().Q);
if (q.IsInfinity)
{
throw new InvalidOperationException("You won the big prize ! this would happen only 1 in 2^127. Take a screenshot, and roll the dice again.");
}
var p = new Org.BouncyCastle.Math.EC.FpPoint(ECKey.CURVE.Curve, q.X, q.Y, true);
return(new PubKey(p.GetEncoded()));
}
public PubKey Derivate(byte[] cc, uint nChild, out byte[] ccChild)
{
byte[] lr = null;
byte[] l = new byte[32];
byte[] r = new byte[32];
if((nChild >> 31) == 0)
{
var pubKey = ToBytes();
lr = Hashes.BIP32Hash(cc, nChild, pubKey[0], pubKey.Skip(1).ToArray());
}
else
{
throw new InvalidOperationException("Impossible to derivate a child key from a hardened one");
}
Array.Copy(lr, l, 32);
Array.Copy(lr, 32, r, 0, 32);
ccChild = r;
BigInteger N = ECKey.CURVE.N;
BigInteger kPar = new BigInteger(1, this.vch);
BigInteger parse256LL = new BigInteger(1, l);
if(parse256LL.CompareTo(N) >= 0)
throw new InvalidOperationException("You won a prize ! this should happen very rarely. Take a screenshot, and roll the dice again.");
var q = ECKey.CURVE.G.Multiply(parse256LL).Add(_Key.GetPublicKeyParameters().Q);
if(q.IsInfinity)
throw new InvalidOperationException("You won the big prize ! this would happen only 1 in 2^127. Take a screenshot, and roll the dice again.");
var p = new Org.BouncyCastle.Math.EC.FpPoint(ECKey.CURVE.Curve, q.X, q.Y, true);
return new PubKey(p.GetEncoded());
}
