public static AsymmetricKeyParameter CreateKey(Stream inStr) { return(PublicKeyFactory.CreateKey(SubjectPublicKeyInfo.GetInstance(Asn1Object.FromStream(inStr)))); }
public static AsymmetricKeyParameter CreateKey(SubjectPublicKeyInfo keyInfo) { AlgorithmIdentifier algorithmID = keyInfo.AlgorithmID; DerObjectIdentifier objectID = algorithmID.ObjectID; if (objectID.Equals(PkcsObjectIdentifiers.RsaEncryption) || objectID.Equals(X509ObjectIdentifiers.IdEARsa) || objectID.Equals(PkcsObjectIdentifiers.IdRsassaPss) || objectID.Equals(PkcsObjectIdentifiers.IdRsaesOaep)) { RsaPublicKeyStructure instance = RsaPublicKeyStructure.GetInstance(keyInfo.GetPublicKey()); return(new RsaKeyParameters(false, instance.Modulus, instance.PublicExponent)); } if (objectID.Equals(X9ObjectIdentifiers.DHPublicNumber)) { Asn1Sequence instance2 = Asn1Sequence.GetInstance(algorithmID.Parameters.ToAsn1Object()); DHPublicKey instance3 = DHPublicKey.GetInstance(keyInfo.GetPublicKey()); BigInteger value = instance3.Y.Value; if (PublicKeyFactory.IsPkcsDHParam(instance2)) { return(PublicKeyFactory.ReadPkcsDHParam(objectID, value, instance2)); } DHDomainParameters instance4 = DHDomainParameters.GetInstance(instance2); BigInteger value2 = instance4.P.Value; BigInteger value3 = instance4.G.Value; BigInteger value4 = instance4.Q.Value; BigInteger j = null; if (instance4.J != null) { j = instance4.J.Value; } DHValidationParameters validation = null; DHValidationParms validationParms = instance4.ValidationParms; if (validationParms != null) { byte[] bytes = validationParms.Seed.GetBytes(); BigInteger value5 = validationParms.PgenCounter.Value; validation = new DHValidationParameters(bytes, value5.IntValue); } return(new DHPublicKeyParameters(value, new DHParameters(value2, value3, value4, j, validation))); } else { if (objectID.Equals(PkcsObjectIdentifiers.DhKeyAgreement)) { Asn1Sequence instance5 = Asn1Sequence.GetInstance(algorithmID.Parameters.ToAsn1Object()); DerInteger derInteger = (DerInteger)keyInfo.GetPublicKey(); return(PublicKeyFactory.ReadPkcsDHParam(objectID, derInteger.Value, instance5)); } if (objectID.Equals(OiwObjectIdentifiers.ElGamalAlgorithm)) { ElGamalParameter elGamalParameter = new ElGamalParameter(Asn1Sequence.GetInstance(algorithmID.Parameters.ToAsn1Object())); DerInteger derInteger2 = (DerInteger)keyInfo.GetPublicKey(); return(new ElGamalPublicKeyParameters(derInteger2.Value, new ElGamalParameters(elGamalParameter.P, elGamalParameter.G))); } if (objectID.Equals(X9ObjectIdentifiers.IdDsa) || objectID.Equals(OiwObjectIdentifiers.DsaWithSha1)) { DerInteger derInteger3 = (DerInteger)keyInfo.GetPublicKey(); Asn1Encodable parameters = algorithmID.Parameters; DsaParameters parameters2 = null; if (parameters != null) { DsaParameter instance6 = DsaParameter.GetInstance(parameters.ToAsn1Object()); parameters2 = new DsaParameters(instance6.P, instance6.Q, instance6.G); } return(new DsaPublicKeyParameters(derInteger3.Value, parameters2)); } if (objectID.Equals(X9ObjectIdentifiers.IdECPublicKey)) { X962Parameters x962Parameters = new X962Parameters(algorithmID.Parameters.ToAsn1Object()); X9ECParameters x9ECParameters; if (x962Parameters.IsNamedCurve) { x9ECParameters = ECKeyPairGenerator.FindECCurveByOid((DerObjectIdentifier)x962Parameters.Parameters); } else { x9ECParameters = new X9ECParameters((Asn1Sequence)x962Parameters.Parameters); } Asn1OctetString s = new DerOctetString(keyInfo.PublicKeyData.GetBytes()); X9ECPoint x9ECPoint = new X9ECPoint(x9ECParameters.Curve, s); ECPoint point = x9ECPoint.Point; if (x962Parameters.IsNamedCurve) { return(new ECPublicKeyParameters("EC", point, (DerObjectIdentifier)x962Parameters.Parameters)); } ECDomainParameters parameters3 = new ECDomainParameters(x9ECParameters.Curve, x9ECParameters.G, x9ECParameters.N, x9ECParameters.H, x9ECParameters.GetSeed()); return(new ECPublicKeyParameters(point, parameters3)); } else if (objectID.Equals(CryptoProObjectIdentifiers.GostR3410x2001)) { Gost3410PublicKeyAlgParameters gost3410PublicKeyAlgParameters = new Gost3410PublicKeyAlgParameters((Asn1Sequence)algorithmID.Parameters); Asn1OctetString asn1OctetString; try { asn1OctetString = (Asn1OctetString)keyInfo.GetPublicKey(); } catch (IOException) { throw new ArgumentException("invalid info structure in GOST3410 public key"); } byte[] octets = asn1OctetString.GetOctets(); byte[] array = new byte[32]; byte[] array2 = new byte[32]; for (int num = 0; num != array2.Length; num++) { array[num] = octets[31 - num]; } for (int num2 = 0; num2 != array.Length; num2++) { array2[num2] = octets[63 - num2]; } ECDomainParameters byOid = ECGost3410NamedCurves.GetByOid(gost3410PublicKeyAlgParameters.PublicKeyParamSet); if (byOid == null) { return(null); } ECPoint q = byOid.Curve.CreatePoint(new BigInteger(1, array), new BigInteger(1, array2)); return(new ECPublicKeyParameters("ECGOST3410", q, gost3410PublicKeyAlgParameters.PublicKeyParamSet)); } else { if (objectID.Equals(CryptoProObjectIdentifiers.GostR3410x94)) { Gost3410PublicKeyAlgParameters gost3410PublicKeyAlgParameters2 = new Gost3410PublicKeyAlgParameters((Asn1Sequence)algorithmID.Parameters); DerOctetString derOctetString; try { derOctetString = (DerOctetString)keyInfo.GetPublicKey(); } catch (IOException) { throw new ArgumentException("invalid info structure in GOST3410 public key"); } byte[] octets2 = derOctetString.GetOctets(); byte[] array3 = new byte[octets2.Length]; for (int num3 = 0; num3 != octets2.Length; num3++) { array3[num3] = octets2[octets2.Length - 1 - num3]; } BigInteger y = new BigInteger(1, array3); return(new Gost3410PublicKeyParameters(y, gost3410PublicKeyAlgParameters2.PublicKeyParamSet)); } throw new SecurityUtilityException("algorithm identifier in key not recognised: " + objectID); } } }
public static AsymmetricKeyParameter CreateKey(byte[] keyInfoData) { return(PublicKeyFactory.CreateKey(SubjectPublicKeyInfo.GetInstance(Asn1Object.FromByteArray(keyInfoData)))); }