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Diffstat (limited to 'Crypto/src/x509/SubjectPublicKeyInfoFactory.cs')
| -rw-r--r-- | Crypto/src/x509/SubjectPublicKeyInfoFactory.cs | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/Crypto/src/x509/SubjectPublicKeyInfoFactory.cs b/Crypto/src/x509/SubjectPublicKeyInfoFactory.cs new file mode 100644 index 000000000..54ca78090 --- /dev/null +++ b/Crypto/src/x509/SubjectPublicKeyInfoFactory.cs @@ -0,0 +1,187 @@ +using System; +using System.IO; +using System.Collections; +using System.Text; + +using Org.BouncyCastle.Crypto.Parameters; +using Org.BouncyCastle.Asn1; +using Org.BouncyCastle.Asn1.CryptoPro; +using Org.BouncyCastle.Asn1.Oiw; +using Org.BouncyCastle.Asn1.Pkcs; +using Org.BouncyCastle.Asn1.X509; +using Org.BouncyCastle.Asn1.X9; +using Org.BouncyCastle.Crypto; +using Org.BouncyCastle.Math; +using Org.BouncyCastle.Math.EC; +using Org.BouncyCastle.Utilities; + +namespace Org.BouncyCastle.X509 +{ + /// <summary> + /// A factory to produce Public Key Info Objects. + /// </summary> + public sealed class SubjectPublicKeyInfoFactory + { + private SubjectPublicKeyInfoFactory() + { + } + + /// <summary> + /// Create a Subject Public Key Info object for a given public key. + /// </summary> + /// <param name="key">One of ElGammalPublicKeyParameters, DSAPublicKeyParameter, DHPublicKeyParameters, RsaKeyParameters or ECPublicKeyParameters</param> + /// <returns>A subject public key info object.</returns> + /// <exception cref="Exception">Throw exception if object provided is not one of the above.</exception> + public static SubjectPublicKeyInfo CreateSubjectPublicKeyInfo( + AsymmetricKeyParameter key) + { + if (key == null) + throw new ArgumentNullException("key"); + if (key.IsPrivate) + throw new ArgumentException("Private key passed - public key expected.", "key"); + + if (key is ElGamalPublicKeyParameters) + { + ElGamalPublicKeyParameters _key = (ElGamalPublicKeyParameters)key; + ElGamalParameters kp = _key.Parameters; + + SubjectPublicKeyInfo info = new SubjectPublicKeyInfo( + new AlgorithmIdentifier( + OiwObjectIdentifiers.ElGamalAlgorithm, + new ElGamalParameter(kp.P, kp.G).ToAsn1Object()), + new DerInteger(_key.Y)); + + return info; + } + + if (key is DsaPublicKeyParameters) + { + DsaPublicKeyParameters _key = (DsaPublicKeyParameters) key; + DsaParameters kp = _key.Parameters; + Asn1Encodable ae = kp == null + ? null + : new DsaParameter(kp.P, kp.Q, kp.G).ToAsn1Object(); + + return new SubjectPublicKeyInfo( + new AlgorithmIdentifier(X9ObjectIdentifiers.IdDsa, ae), + new DerInteger(_key.Y)); + } + + if (key is DHPublicKeyParameters) + { + DHPublicKeyParameters _key = (DHPublicKeyParameters) key; + DHParameters kp = _key.Parameters; + + SubjectPublicKeyInfo info = new SubjectPublicKeyInfo( + new AlgorithmIdentifier( + _key.AlgorithmOid, + new DHParameter(kp.P, kp.G, kp.L).ToAsn1Object()), + new DerInteger(_key.Y)); + + return info; + } // End of DH + + if (key is RsaKeyParameters) + { + RsaKeyParameters _key = (RsaKeyParameters) key; + + SubjectPublicKeyInfo info = new SubjectPublicKeyInfo( + new AlgorithmIdentifier(PkcsObjectIdentifiers.RsaEncryption, DerNull.Instance), + new RsaPublicKeyStructure(_key.Modulus, _key.Exponent).ToAsn1Object()); + + return info; + } // End of RSA. + + if (key is ECPublicKeyParameters) + { + ECPublicKeyParameters _key = (ECPublicKeyParameters) key; + + if (_key.AlgorithmName == "ECGOST3410") + { + if (_key.PublicKeyParamSet == null) + throw Platform.CreateNotImplementedException("Not a CryptoPro parameter set"); + + ECPoint q = _key.Q; + BigInteger bX = q.X.ToBigInteger(); + BigInteger bY = q.Y.ToBigInteger(); + + byte[] encKey = new byte[64]; + ExtractBytes(encKey, 0, bX); + ExtractBytes(encKey, 32, bY); + + Gost3410PublicKeyAlgParameters gostParams = new Gost3410PublicKeyAlgParameters( + _key.PublicKeyParamSet, CryptoProObjectIdentifiers.GostR3411x94CryptoProParamSet); + + AlgorithmIdentifier algID = new AlgorithmIdentifier( + CryptoProObjectIdentifiers.GostR3410x2001, + gostParams.ToAsn1Object()); + + return new SubjectPublicKeyInfo(algID, new DerOctetString(encKey)); + } + else + { + X962Parameters x962; + if (_key.PublicKeyParamSet == null) + { + ECDomainParameters kp = _key.Parameters; + X9ECParameters ecP = new X9ECParameters(kp.Curve, kp.G, kp.N, kp.H, kp.GetSeed()); + + x962 = new X962Parameters(ecP); + } + else + { + x962 = new X962Parameters(_key.PublicKeyParamSet); + } + + Asn1OctetString p = (Asn1OctetString)(new X9ECPoint(_key.Q).ToAsn1Object()); + + AlgorithmIdentifier algID = new AlgorithmIdentifier( + X9ObjectIdentifiers.IdECPublicKey, x962.ToAsn1Object()); + + return new SubjectPublicKeyInfo(algID, p.GetOctets()); + } + } // End of EC + + if (key is Gost3410PublicKeyParameters) + { + Gost3410PublicKeyParameters _key = (Gost3410PublicKeyParameters) key; + + if (_key.PublicKeyParamSet == null) + throw Platform.CreateNotImplementedException("Not a CryptoPro parameter set"); + + byte[] keyEnc = _key.Y.ToByteArrayUnsigned(); + byte[] keyBytes = new byte[keyEnc.Length]; + + for (int i = 0; i != keyBytes.Length; i++) + { + keyBytes[i] = keyEnc[keyEnc.Length - 1 - i]; // must be little endian + } + + Gost3410PublicKeyAlgParameters algParams = new Gost3410PublicKeyAlgParameters( + _key.PublicKeyParamSet, CryptoProObjectIdentifiers.GostR3411x94CryptoProParamSet); + + AlgorithmIdentifier algID = new AlgorithmIdentifier( + CryptoProObjectIdentifiers.GostR3410x94, + algParams.ToAsn1Object()); + + return new SubjectPublicKeyInfo(algID, new DerOctetString(keyBytes)); + } + + throw new ArgumentException("Class provided no convertible: " + key.GetType().FullName); + } + + private static void ExtractBytes( + byte[] encKey, + int offset, + BigInteger bI) + { + byte[] val = bI.ToByteArray(); + int n = (bI.BitLength + 7) / 8; + + for (int i = 0; i < n; ++i) + { + encKey[offset + i] = val[val.Length - 1 - i]; + } + } + } +} |