288 lines
11 KiB
C#
288 lines
11 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using System.Collections;
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using System.IO;
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using System.Text;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.CryptoPro;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.EdEC;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.Oiw;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.Pkcs;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.Sec;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.X509;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Asn1.X9;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Generators;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Parameters;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Math;
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Math.EC;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Security
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{
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public sealed class PublicKeyFactory
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{
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private PublicKeyFactory()
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{
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}
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public static AsymmetricKeyParameter CreateKey(
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byte[] keyInfoData)
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{
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return CreateKey(
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SubjectPublicKeyInfo.GetInstance(
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Asn1Object.FromByteArray(keyInfoData)));
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}
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public static AsymmetricKeyParameter CreateKey(
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Stream inStr)
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{
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return CreateKey(
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SubjectPublicKeyInfo.GetInstance(
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Asn1Object.FromStream(inStr)));
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}
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public static AsymmetricKeyParameter CreateKey(
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SubjectPublicKeyInfo keyInfo)
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{
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AlgorithmIdentifier algID = keyInfo.AlgorithmID;
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DerObjectIdentifier algOid = algID.Algorithm;
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// TODO See RSAUtil.isRsaOid in Java build
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if (algOid.Equals(PkcsObjectIdentifiers.RsaEncryption)
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|| algOid.Equals(X509ObjectIdentifiers.IdEARsa)
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|| algOid.Equals(PkcsObjectIdentifiers.IdRsassaPss)
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|| algOid.Equals(PkcsObjectIdentifiers.IdRsaesOaep))
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{
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RsaPublicKeyStructure pubKey = RsaPublicKeyStructure.GetInstance(
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keyInfo.GetPublicKey());
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return new RsaKeyParameters(false, pubKey.Modulus, pubKey.PublicExponent);
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}
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else if (algOid.Equals(X9ObjectIdentifiers.DHPublicNumber))
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{
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Asn1Sequence seq = Asn1Sequence.GetInstance(algID.Parameters.ToAsn1Object());
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DHPublicKey dhPublicKey = DHPublicKey.GetInstance(keyInfo.GetPublicKey());
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BigInteger y = dhPublicKey.Y.Value;
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if (IsPkcsDHParam(seq))
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return ReadPkcsDHParam(algOid, y, seq);
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DHDomainParameters dhParams = DHDomainParameters.GetInstance(seq);
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BigInteger p = dhParams.P.Value;
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BigInteger g = dhParams.G.Value;
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BigInteger q = dhParams.Q.Value;
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BigInteger j = null;
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if (dhParams.J != null)
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{
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j = dhParams.J.Value;
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}
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DHValidationParameters validation = null;
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DHValidationParms dhValidationParms = dhParams.ValidationParms;
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if (dhValidationParms != null)
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{
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byte[] seed = dhValidationParms.Seed.GetBytes();
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BigInteger pgenCounter = dhValidationParms.PgenCounter.Value;
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// TODO Check pgenCounter size?
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validation = new DHValidationParameters(seed, pgenCounter.IntValue);
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}
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return new DHPublicKeyParameters(y, new DHParameters(p, g, q, j, validation));
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}
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else if (algOid.Equals(PkcsObjectIdentifiers.DhKeyAgreement))
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{
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Asn1Sequence seq = Asn1Sequence.GetInstance(algID.Parameters.ToAsn1Object());
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DerInteger derY = (DerInteger) keyInfo.GetPublicKey();
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return ReadPkcsDHParam(algOid, derY.Value, seq);
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}
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else if (algOid.Equals(OiwObjectIdentifiers.ElGamalAlgorithm))
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{
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ElGamalParameter para = new ElGamalParameter(
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Asn1Sequence.GetInstance(algID.Parameters.ToAsn1Object()));
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DerInteger derY = (DerInteger) keyInfo.GetPublicKey();
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return new ElGamalPublicKeyParameters(
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derY.Value,
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new ElGamalParameters(para.P, para.G));
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}
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else if (algOid.Equals(X9ObjectIdentifiers.IdDsa)
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|| algOid.Equals(OiwObjectIdentifiers.DsaWithSha1))
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{
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DerInteger derY = (DerInteger) keyInfo.GetPublicKey();
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Asn1Encodable ae = algID.Parameters;
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DsaParameters parameters = null;
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if (ae != null)
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{
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DsaParameter para = DsaParameter.GetInstance(ae.ToAsn1Object());
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parameters = new DsaParameters(para.P, para.Q, para.G);
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}
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return new DsaPublicKeyParameters(derY.Value, parameters);
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}
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else if (algOid.Equals(X9ObjectIdentifiers.IdECPublicKey))
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{
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X962Parameters para = new X962Parameters(algID.Parameters.ToAsn1Object());
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X9ECParameters x9;
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if (para.IsNamedCurve)
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{
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x9 = ECKeyPairGenerator.FindECCurveByOid((DerObjectIdentifier)para.Parameters);
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}
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else
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{
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x9 = new X9ECParameters((Asn1Sequence)para.Parameters);
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}
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Asn1OctetString key = new DerOctetString(keyInfo.PublicKeyData.GetBytes());
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X9ECPoint derQ = new X9ECPoint(x9.Curve, key);
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ECPoint q = derQ.Point;
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if (para.IsNamedCurve)
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{
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return new ECPublicKeyParameters("EC", q, (DerObjectIdentifier)para.Parameters);
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}
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ECDomainParameters dParams = new ECDomainParameters(x9.Curve, x9.G, x9.N, x9.H, x9.GetSeed());
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return new ECPublicKeyParameters(q, dParams);
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}
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else if (algOid.Equals(CryptoProObjectIdentifiers.GostR3410x2001))
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{
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Gost3410PublicKeyAlgParameters gostParams = new Gost3410PublicKeyAlgParameters(
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(Asn1Sequence) algID.Parameters);
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Asn1OctetString key;
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try
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{
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key = (Asn1OctetString) keyInfo.GetPublicKey();
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}
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catch (IOException)
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{
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throw new ArgumentException("invalid info structure in GOST3410 public key");
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}
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byte[] keyEnc = key.GetOctets();
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byte[] x = new byte[32];
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byte[] y = new byte[32];
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for (int i = 0; i != y.Length; i++)
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{
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x[i] = keyEnc[32 - 1 - i];
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}
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for (int i = 0; i != x.Length; i++)
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{
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y[i] = keyEnc[64 - 1 - i];
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}
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ECDomainParameters ecP = ECGost3410NamedCurves.GetByOid(gostParams.PublicKeyParamSet);
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if (ecP == null)
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return null;
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ECPoint q = ecP.Curve.CreatePoint(new BigInteger(1, x), new BigInteger(1, y));
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return new ECPublicKeyParameters("ECGOST3410", q, gostParams.PublicKeyParamSet);
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}
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else if (algOid.Equals(CryptoProObjectIdentifiers.GostR3410x94))
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{
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Gost3410PublicKeyAlgParameters algParams = new Gost3410PublicKeyAlgParameters(
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(Asn1Sequence) algID.Parameters);
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DerOctetString derY;
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try
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{
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derY = (DerOctetString) keyInfo.GetPublicKey();
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}
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catch (IOException)
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{
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throw new ArgumentException("invalid info structure in GOST3410 public key");
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}
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byte[] keyEnc = derY.GetOctets();
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byte[] keyBytes = new byte[keyEnc.Length];
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for (int i = 0; i != keyEnc.Length; i++)
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{
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keyBytes[i] = keyEnc[keyEnc.Length - 1 - i]; // was little endian
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}
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BigInteger y = new BigInteger(1, keyBytes);
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return new Gost3410PublicKeyParameters(y, algParams.PublicKeyParamSet);
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}
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else if (algOid.Equals(EdECObjectIdentifiers.id_X25519))
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{
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return new X25519PublicKeyParameters(GetRawKey(keyInfo, X25519PublicKeyParameters.KeySize), 0);
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}
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else if (algOid.Equals(EdECObjectIdentifiers.id_X448))
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{
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return new X448PublicKeyParameters(GetRawKey(keyInfo, X448PublicKeyParameters.KeySize), 0);
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}
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else if (algOid.Equals(EdECObjectIdentifiers.id_Ed25519))
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{
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return new Ed25519PublicKeyParameters(GetRawKey(keyInfo, Ed25519PublicKeyParameters.KeySize), 0);
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}
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else if (algOid.Equals(EdECObjectIdentifiers.id_Ed448))
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{
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return new Ed448PublicKeyParameters(GetRawKey(keyInfo, Ed448PublicKeyParameters.KeySize), 0);
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}
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else
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{
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throw new SecurityUtilityException("algorithm identifier in public key not recognised: " + algOid);
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}
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}
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private static byte[] GetRawKey(SubjectPublicKeyInfo keyInfo, int expectedSize)
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{
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/*
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* TODO[RFC 8422]
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* - Require keyInfo.Algorithm.Parameters == null?
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*/
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byte[] result = keyInfo.PublicKeyData.GetOctets();
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if (expectedSize != result.Length)
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throw new SecurityUtilityException("public key encoding has incorrect length");
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return result;
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}
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private static bool IsPkcsDHParam(Asn1Sequence seq)
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{
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if (seq.Count == 2)
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return true;
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if (seq.Count > 3)
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return false;
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DerInteger l = DerInteger.GetInstance(seq[2]);
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DerInteger p = DerInteger.GetInstance(seq[0]);
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return l.Value.CompareTo(BigInteger.ValueOf(p.Value.BitLength)) <= 0;
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}
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private static DHPublicKeyParameters ReadPkcsDHParam(DerObjectIdentifier algOid,
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BigInteger y, Asn1Sequence seq)
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{
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DHParameter para = new DHParameter(seq);
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BigInteger lVal = para.L;
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int l = lVal == null ? 0 : lVal.IntValue;
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DHParameters dhParams = new DHParameters(para.P, para.G, null, l);
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return new DHPublicKeyParameters(y, dhParams, algOid);
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}
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}
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}
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#pragma warning restore
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#endif
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