using System; using System.Collections; using System.IO; using System.Text; using Org.BouncyCastle.Asn1; using Org.BouncyCastle.Asn1.CryptoPro; using Org.BouncyCastle.Asn1.EdEC; using Org.BouncyCastle.Asn1.Oiw; using Org.BouncyCastle.Asn1.Pkcs; using Org.BouncyCastle.Asn1.Sec; using Org.BouncyCastle.Asn1.X509; using Org.BouncyCastle.Asn1.X9; using Org.BouncyCastle.Crypto; using Org.BouncyCastle.Crypto.Generators; using Org.BouncyCastle.Crypto.Parameters; using Org.BouncyCastle.Math; using Org.BouncyCastle.Pkcs; using Org.BouncyCastle.Utilities; namespace Org.BouncyCastle.Security { public sealed class PrivateKeyFactory { private PrivateKeyFactory() { } public static AsymmetricKeyParameter CreateKey( byte[] privateKeyInfoData) { return CreateKey( PrivateKeyInfo.GetInstance( Asn1Object.FromByteArray(privateKeyInfoData))); } public static AsymmetricKeyParameter CreateKey( Stream inStr) { return CreateKey( PrivateKeyInfo.GetInstance( Asn1Object.FromStream(inStr))); } public static AsymmetricKeyParameter CreateKey( PrivateKeyInfo keyInfo) { AlgorithmIdentifier algID = keyInfo.PrivateKeyAlgorithm; DerObjectIdentifier algOid = algID.Algorithm; // TODO See RSAUtil.isRsaOid in Java build if (algOid.Equals(PkcsObjectIdentifiers.RsaEncryption) || algOid.Equals(X509ObjectIdentifiers.IdEARsa) || algOid.Equals(PkcsObjectIdentifiers.IdRsassaPss) || algOid.Equals(PkcsObjectIdentifiers.IdRsaesOaep)) { RsaPrivateKeyStructure keyStructure = RsaPrivateKeyStructure.GetInstance(keyInfo.ParsePrivateKey()); return new RsaPrivateCrtKeyParameters( keyStructure.Modulus, keyStructure.PublicExponent, keyStructure.PrivateExponent, keyStructure.Prime1, keyStructure.Prime2, keyStructure.Exponent1, keyStructure.Exponent2, keyStructure.Coefficient); } // TODO? // else if (algOid.Equals(X9ObjectIdentifiers.DHPublicNumber)) else if (algOid.Equals(PkcsObjectIdentifiers.DhKeyAgreement)) { DHParameter para = new DHParameter( Asn1Sequence.GetInstance(algID.Parameters.ToAsn1Object())); DerInteger derX = (DerInteger)keyInfo.ParsePrivateKey(); BigInteger lVal = para.L; int l = lVal == null ? 0 : lVal.IntValue; DHParameters dhParams = new DHParameters(para.P, para.G, null, l); return new DHPrivateKeyParameters(derX.Value, dhParams, algOid); } else if (algOid.Equals(OiwObjectIdentifiers.ElGamalAlgorithm)) { ElGamalParameter para = new ElGamalParameter( Asn1Sequence.GetInstance(algID.Parameters.ToAsn1Object())); DerInteger derX = (DerInteger)keyInfo.ParsePrivateKey(); return new ElGamalPrivateKeyParameters( derX.Value, new ElGamalParameters(para.P, para.G)); } else if (algOid.Equals(X9ObjectIdentifiers.IdDsa)) { DerInteger derX = (DerInteger)keyInfo.ParsePrivateKey(); Asn1Encodable ae = algID.Parameters; DsaParameters parameters = null; if (ae != null) { DsaParameter para = DsaParameter.GetInstance(ae.ToAsn1Object()); parameters = new DsaParameters(para.P, para.Q, para.G); } return new DsaPrivateKeyParameters(derX.Value, parameters); } else if (algOid.Equals(X9ObjectIdentifiers.IdECPublicKey)) { X962Parameters para = new X962Parameters(algID.Parameters.ToAsn1Object()); X9ECParameters x9; if (para.IsNamedCurve) { x9 = ECKeyPairGenerator.FindECCurveByOid((DerObjectIdentifier)para.Parameters); } else { x9 = new X9ECParameters((Asn1Sequence)para.Parameters); } ECPrivateKeyStructure ec = ECPrivateKeyStructure.GetInstance(keyInfo.ParsePrivateKey()); BigInteger d = ec.GetKey(); if (para.IsNamedCurve) { return new ECPrivateKeyParameters("EC", d, (DerObjectIdentifier)para.Parameters); } ECDomainParameters dParams = new ECDomainParameters(x9.Curve, x9.G, x9.N, x9.H, x9.GetSeed()); return new ECPrivateKeyParameters(d, dParams); } else if (algOid.Equals(CryptoProObjectIdentifiers.GostR3410x2001)) { Gost3410PublicKeyAlgParameters gostParams = new Gost3410PublicKeyAlgParameters( Asn1Sequence.GetInstance(algID.Parameters.ToAsn1Object())); ECDomainParameters ecP = ECGost3410NamedCurves.GetByOid(gostParams.PublicKeyParamSet); if (ecP == null) throw new ArgumentException("Unrecognized curve OID for GostR3410x2001 private key"); Asn1Object privKey = keyInfo.ParsePrivateKey(); ECPrivateKeyStructure ec; if (privKey is DerInteger) { ec = new ECPrivateKeyStructure(ecP.N.BitLength, ((DerInteger)privKey).PositiveValue); } else { ec = ECPrivateKeyStructure.GetInstance(privKey); } return new ECPrivateKeyParameters("ECGOST3410", ec.GetKey(), gostParams.PublicKeyParamSet); } else if (algOid.Equals(CryptoProObjectIdentifiers.GostR3410x94)) { Gost3410PublicKeyAlgParameters gostParams = Gost3410PublicKeyAlgParameters.GetInstance(algID.Parameters); Asn1Object privKey = keyInfo.ParsePrivateKey(); BigInteger x; if (privKey is DerInteger) { x = DerInteger.GetInstance(privKey).PositiveValue; } else { x = new BigInteger(1, Arrays.Reverse(Asn1OctetString.GetInstance(privKey).GetOctets())); } return new Gost3410PrivateKeyParameters(x, gostParams.PublicKeyParamSet); } else if (algOid.Equals(EdECObjectIdentifiers.id_X25519)) { return new X25519PrivateKeyParameters(GetRawKey(keyInfo, X25519PrivateKeyParameters.KeySize), 0); } else if (algOid.Equals(EdECObjectIdentifiers.id_X448)) { return new X448PrivateKeyParameters(GetRawKey(keyInfo, X448PrivateKeyParameters.KeySize), 0); } else if (algOid.Equals(EdECObjectIdentifiers.id_Ed25519)) { return new Ed25519PrivateKeyParameters(GetRawKey(keyInfo, Ed25519PrivateKeyParameters.KeySize), 0); } else if (algOid.Equals(EdECObjectIdentifiers.id_Ed448)) { return new Ed448PrivateKeyParameters(GetRawKey(keyInfo, Ed448PrivateKeyParameters.KeySize), 0); } else { throw new SecurityUtilityException("algorithm identifier in private key not recognised"); } } private static byte[] GetRawKey(PrivateKeyInfo keyInfo, int expectedSize) { byte[] result = Asn1OctetString.GetInstance(keyInfo.ParsePrivateKey()).GetOctets(); if (expectedSize != result.Length) throw new SecurityUtilityException("private key encoding has incorrect length"); return result; } public static AsymmetricKeyParameter DecryptKey( char[] passPhrase, EncryptedPrivateKeyInfo encInfo) { return CreateKey(PrivateKeyInfoFactory.CreatePrivateKeyInfo(passPhrase, encInfo)); } public static AsymmetricKeyParameter DecryptKey( char[] passPhrase, byte[] encryptedPrivateKeyInfoData) { return DecryptKey(passPhrase, Asn1Object.FromByteArray(encryptedPrivateKeyInfoData)); } public static AsymmetricKeyParameter DecryptKey( char[] passPhrase, Stream encryptedPrivateKeyInfoStream) { return DecryptKey(passPhrase, Asn1Object.FromStream(encryptedPrivateKeyInfoStream)); } private static AsymmetricKeyParameter DecryptKey( char[] passPhrase, Asn1Object asn1Object) { return DecryptKey(passPhrase, EncryptedPrivateKeyInfo.GetInstance(asn1Object)); } public static byte[] EncryptKey( DerObjectIdentifier algorithm, char[] passPhrase, byte[] salt, int iterationCount, AsymmetricKeyParameter key) { return EncryptedPrivateKeyInfoFactory.CreateEncryptedPrivateKeyInfo( algorithm, passPhrase, salt, iterationCount, key).GetEncoded(); } public static byte[] EncryptKey( string algorithm, char[] passPhrase, byte[] salt, int iterationCount, AsymmetricKeyParameter key) { return EncryptedPrivateKeyInfoFactory.CreateEncryptedPrivateKeyInfo( algorithm, passPhrase, salt, iterationCount, key).GetEncoded(); } } }