/*
* // https://csharp.hotexamples.com/examples/Org.BouncyCastle.Crypto.Parameters/ECPrivateKeyParameters/-/php-ecprivatekeyparameters-class-examples.html
* public ECDiffieHellmanBc(Int32 keySize)
* {
* Org.BouncyCastle.Asn1.X9.X9ECParameters ecParams;
* switch (keySize) {
* case 256:
* ecParams = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName("secp256r1");
* break;
* case 384:
* ecParams = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName("secp384r1");
* break;
* case 521:
* ecParams = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName("secp521r1");
* break;
* default:
*/
// https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml
// https://tools.ietf.org/html/rfc5933
private static PublicKey toECGOSTPublicKey(byte[] keyBytes, ECKeyInfo keyinfo) // throws IOException, GeneralSecurityException
{
DNSInput @in = new DNSInput(keyBytes);
Org.BouncyCastle.Math.BigInteger x = Helpers.readBigIntegerLittleEndian(@in, keyinfo.length);
Org.BouncyCastle.Math.BigInteger y = Helpers.readBigIntegerLittleEndian(@in, keyinfo.length);
// OID to be found in Org.BouncyCastle.Security.GeneratorUtilities.GetKeyPairGenerator("ECGOST3410");
// Org.BouncyCastle.Crypto.Parameters.ECDomainParameters domain = Org.BouncyCastle.Asn1.CryptoPro.ECGost3410NamedCurves.GetByOid(Org.BouncyCastle.Asn1.CryptoPro.CryptoProObjectIdentifiers.GostR3410x94CryptoProA);
// Org.BouncyCastle.Math.EC.ECCurve c = domain.Curve;
// Org.BouncyCastle.Math.EC.ECPoint q = new Org.BouncyCastle.Math.EC.FpPoint(c, c.FromBigInteger(x), c.FromBigInteger(y));
// Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters publicParams = new Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters(q, domain);
Org.BouncyCastle.Math.EC.ECPoint q = keyinfo.curve.CreatePoint(x, y);
Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters publicParams = new Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters(q, keyinfo.spec);
// Org.BouncyCastle.Crypto.Signers.ECGost3410Signer
// Org.BouncyCastle.Security.PublicKeyFactory.CreateKey(new Org.BouncyCastle.Asn1.X509.SubjectPublicKeyInfo())
/*
* ECPoint q = new ECPoint(x, y);
*
* KeyFactory factory = KeyFactory.getInstance("ECGOST3410");
* return factory.generatePublic(new ECPublicKeySpec(q, keyinfo.spec));
*/
return(PublicKey.CreateInstance(publicParams));
}
private static PublicKey toECDSAPublicKey(byte[] keyBytes, ECKeyInfo keyinfo) // throws IOException, GeneralSecurityException
{
DNSInput @in = new DNSInput(keyBytes);
// RFC 6605 Section 4
Org.BouncyCastle.Math.BigInteger x = Helpers.readBigInteger(@in, keyinfo.length);
Org.BouncyCastle.Math.BigInteger y = Helpers.readBigInteger(@in, keyinfo.length);
// Org.BouncyCastle.Asn1.X9.X9ECParameters ecParams = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName("secp521r1");
// Org.BouncyCastle.Asn1.X9.X9ECParameters ecParams = Org.BouncyCastle.Asn1.Sec.SecNamedCurves.GetByName("secp256r1");
// Org.BouncyCastle.Asn1.X9.X9ECParameters p = Org.BouncyCastle.Asn1.X9.X962NamedCurves.GetByOid(Org.BouncyCastle.Asn1.X9.X9ObjectIdentifiers.Prime239v1);
// Org.BouncyCastle.Asn1.X9.X9ECParameters p = Org.BouncyCastle.Asn1.X9.X962NamedCurves.GetByOid(Org.BouncyCastle.Asn1.X9.X9ObjectIdentifiers.ECDsaWithSha512);
// 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.Asn1.X9.X9ECParameters p = Org.BouncyCastle.Asn1.X9.X962NamedCurves.GetByOid(Org.BouncyCastle.Asn1.X9.X9ObjectIdentifiers.ECDsaWithSha512);
// Org.BouncyCastle.Math.EC.ECCurve c = p.Curve;
// Org.BouncyCastle.Crypto.Parameters.ECDomainParameters domain = new Org.BouncyCastle.Crypto.Parameters.ECDomainParameters(c, p.G, p.N, p.H);
// Org.BouncyCastle.Math.EC.ECPoint q = new Org.BouncyCastle.Math.EC.FpPoint(c, c.FromBigInteger(x), c.FromBigInteger(y));
// Org.BouncyCastle.Math.EC.ECPoint q = c.CreatePoint(x, y);
// Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters publicParams = new Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters(q, domain);
Org.BouncyCastle.Math.EC.ECPoint q = keyinfo.curve.CreatePoint(x, y);
Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters publicParams = new Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters(q, keyinfo.spec);
// Org.BouncyCastle.Security.PublicKeyFactory.CreateKey(Org.BouncyCastle.X509.SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(publicParams));
// Org.BouncyCastle.Security.PrivateKeyFactory.CreateKey(publicParams);
// Org.BouncyCastle.Security.PrivateKeyFactory
// Org.BouncyCastle.Security.PublicKeyFactory
// Org.BouncyCastle.Security.PublicKeyFactory.CreateKey(new Org.BouncyCastle.Asn1.X509.SubjectPublicKeyInfo())
/*
* ECPoint q = new ECPoint(x, y);
*
* KeyFactory factory = KeyFactory.getInstance("EC");
* return factory.generatePublic(new ECPublicKeySpec(q, keyinfo.spec));
*/
return(PublicKey.CreateInstance(publicParams));
}
private static byte[] fromECDSAPublicKey(ECPublicKey key, ECKeyInfo keyinfo)
{
DNSOutput @out = new DNSOutput();
Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters publicParams = key.PublicKey;
// BigInteger x = key.getW().getAffineX();
Org.BouncyCastle.Math.BigInteger x = publicParams.Q.AffineXCoord.ToBigInteger();
// BigInteger y = key.getW().getAffineY();
Org.BouncyCastle.Math.BigInteger y = publicParams.Q.AffineYCoord.ToBigInteger();
Helpers.writePaddedBigInteger(@out, x, keyinfo.length);
Helpers.writePaddedBigInteger(@out, y, keyinfo.length);
return(@out.toByteArray());
}
