Package org.bouncycastle.math.ec

Examples of org.bouncycastle.math.ec.ECCurve

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     */
    public static ECPoint decodePoint(
       EllipticCurve curve,
       byte[] encoded)
    {
        ECCurve c = null;
       
        if (curve.getField() instanceof ECFieldFp)
        {
            c = new ECCurve.Fp(
                    ((ECFieldFp)curve.getField()).getP(), curve.getA(), curve.getB());
        }
        else
        {
            int k[] = ((ECFieldF2m)curve.getField()).getMidTermsOfReductionPolynomial();
           
            if (k.length == 3)
            {
                c = new ECCurve.F2m(
                        ((ECFieldF2m)curve.getField()).getM(), k[2], k[1], k[0], curve.getA(), curve.getB());
            }
            else
            {
                c = new ECCurve.F2m(
                        ((ECFieldF2m)curve.getField()).getM(), k[0], curve.getA(), curve.getB());
            }
        }
       
        org.bouncycastle.math.ec.ECPoint p = c.decodePoint(encoded);
       
        return new ECPoint(p.getX().toBigInteger(), p.getY().toBigInteger());
    }
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            else if (params instanceof java.security.spec.ECParameterSpec)
            {
                java.security.spec.ECParameterSpec p = (java.security.spec.ECParameterSpec)params;
                this.ecParams = params;

                ECCurve curve = EC5Util.convertCurve(p.getCurve());
                ECPoint g = EC5Util.convertPoint(curve, p.getGenerator(), false);

                param = new ECKeyGenerationParameters(new ECDomainParameters(curve, g, p.getOrder(), BigInteger.valueOf(p.getCofactor())), random);

                engine.init(param);
                initialised = true;
            }
            else if (params instanceof ECGenParameterSpec)
            {
                if (this.algorithm.equals("ECGOST3410"))
                {
                    ECDomainParameters  ecP = ECGOST3410NamedCurves.getByName(((ECGenParameterSpec)params).getName());
                    if (ecP == null)
                    {
                        throw new InvalidAlgorithmParameterException("unknown curve name: " + ((ECGenParameterSpec)params).getName());
                    }

                    this.ecParams = new ECNamedCurveSpec(
                                                    ((ECGenParameterSpec)params).getName(),
                                                    ecP.getCurve(),
                                                    ecP.getG(),
                                                    ecP.getN(),
                                                    ecP.getH(),
                                                    ecP.getSeed());
                }
                else
                {
                    X9ECParameters  ecP = X962NamedCurves.getByName(((ECGenParameterSpec)params).getName());
                    if (ecP == null)
                    {
                        ecP = SECNamedCurves.getByName(((ECGenParameterSpec)params).getName());
                        if (ecP == null)
                        {
                            ecP = NISTNamedCurves.getByName(((ECGenParameterSpec)params).getName());
                        }
                        if (ecP == null)
                        {
                            ecP = TeleTrusTNamedCurves.getByName(((ECGenParameterSpec)params).getName());
                        }
                        if (ecP == null)
                        {
                            throw new InvalidAlgorithmParameterException("unknown curve name: " + ((ECGenParameterSpec)params).getName());
                        }
                    }

                    this.ecParams = new ECNamedCurveSpec(
                            ((ECGenParameterSpec)params).getName(),
                            ecP.getCurve(),
                            ecP.getG(),
                            ecP.getN(),
                            ecP.getH(),
                            ecP.getSeed());
                }

                java.security.spec.ECParameterSpec p = (java.security.spec.ECParameterSpec)ecParams;

                ECCurve curve = EC5Util.convertCurve(p.getCurve());
                ECPoint g = EC5Util.convertPoint(curve, p.getGenerator(), false);

                param = new ECKeyGenerationParameters(new ECDomainParameters(curve, g, p.getOrder(), BigInteger.valueOf(p.getCofactor())), random);

                engine.init(param);
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    private void testBCAPI()
        throws Exception
    {
        KeyPairGenerator g = KeyPairGenerator.getInstance("ECDSA", "BC");

        ECCurve curve = new ECCurve.Fp(
            new BigInteger("883423532389192164791648750360308885314476597252960362792450860609699839"), // q
            new BigInteger("7fffffffffffffffffffffff7fffffffffff8000000000007ffffffffffc", 16), // a
            new BigInteger("6b016c3bdcf18941d0d654921475ca71a9db2fb27d1d37796185c2942c0a", 16)); // b

        ECParameterSpec ecSpec = new ECParameterSpec(
            curve,
            curve.decodePoint(Hex.decode("020ffa963cdca8816ccc33b8642bedf905c3d358573d3f27fbbd3b3cb9aaaf")), // G
            new BigInteger("883423532389192164791648750360308884807550341691627752275345424702807307")); // n

        ConfigurableProvider config = (ConfigurableProvider)Security.getProvider("BC");

        config.setParameter(ConfigurableProvider.EC_IMPLICITLY_CA, ecSpec);
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    private void testKeyFactory()
        throws Exception
    {
        KeyPairGenerator g = KeyPairGenerator.getInstance("ECDSA", "BC");

        ECCurve curve = new ECCurve.Fp(
            new BigInteger("883423532389192164791648750360308885314476597252960362792450860609699839"), // q
            new BigInteger("7fffffffffffffffffffffff7fffffffffff8000000000007ffffffffffc", 16), // a
            new BigInteger("6b016c3bdcf18941d0d654921475ca71a9db2fb27d1d37796185c2942c0a", 16)); // b

        ECParameterSpec ecSpec = new ECParameterSpec(
            curve,
            curve.decodePoint(Hex.decode("020ffa963cdca8816ccc33b8642bedf905c3d358573d3f27fbbd3b3cb9aaaf")), // G
            new BigInteger("883423532389192164791648750360308884807550341691627752275345424702807307")); // n

        ConfigurableProvider config = (ConfigurableProvider)Security.getProvider("BC");

        config.setParameter(ConfigurableProvider.EC_IMPLICITLY_CA, ecSpec);
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        this.algorithm = algorithm;
        this.q = spec.getQ();

        if (spec.getParams() != null) // can be null if implictlyCa
        {
            ECCurve curve = spec.getParams().getCurve();
            EllipticCurve ellipticCurve = EC5Util.convertCurve(curve, spec.getParams().getSeed());

            this.ecSpec = EC5Util.convertSpec(ellipticCurve, spec.getParams());
        }
        else
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            gostParams = new GOST3410PublicKeyAlgParameters((ASN1Sequence)info.getAlgorithmId().getParameters());
           
            ECNamedCurveParameterSpec spec = ECGOST3410NamedCurveTable.getParameterSpec(ECGOST3410NamedCurves.getName(gostParams.getPublicKeyParamSet()));

            ECCurve curve = spec.getCurve();
            EllipticCurve ellipticCurve = EC5Util.convertCurve(curve, spec.getSeed());

            this.q = curve.createPoint(new BigInteger(1, x), new BigInteger(1, y), false);

            ecSpec = new ECNamedCurveSpec(
                    ECGOST3410NamedCurves.getName(gostParams.getPublicKeyParamSet()),
                    ellipticCurve,
                    new ECPoint(
                            spec.getG().getX().toBigInteger(),
                            spec.getG().getY().toBigInteger()),
                            spec.getN(), spec.getH());

        }
        else
        {
            X962Parameters          params = new X962Parameters((DERObject)info.getAlgorithmId().getParameters());
            ECCurve                 curve;
            EllipticCurve           ellipticCurve;
           
            if (params.isNamedCurve())
            {
                DERObjectIdentifier oid = (DERObjectIdentifier)params.getParameters();
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            {
                params = new X962Parameters(DERNull.INSTANCE);
            }
            else
            {
                ECCurve curve = EC5Util.convertCurve(ecSpec.getCurve());

                X9ECParameters ecP = new X9ECParameters(
                    curve,
                    EC5Util.convertPoint(curve, ecSpec.getGenerator(), withCompression),
                    ecSpec.getOrder(),
                    BigInteger.valueOf(ecSpec.getCofactor()),
                    ecSpec.getCurve().getSeed());

                params = new X962Parameters(ecP);
            }

            ECCurve curve = this.engineGetQ().getCurve();
            ASN1OctetString p = (ASN1OctetString)
                new X9ECPoint(curve.createPoint(this.getQ().getX().toBigInteger(), this.getQ().getY().toBigInteger(), withCompression)).getDERObject();

            info = new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_ecPublicKey, params.getDERObject()), p.getOctets());
        }

        return info.getDEREncoded();
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        byte[] kData = BigIntegers.asUnsignedByteArray(new BigInteger("700000017569056646655505781757157107570501575775705779575555657156756655"));
       
        SecureRandom    k = new FixedSecureRandom(kData);

        ECCurve curve = new ECCurve.Fp(
            new BigInteger("883423532389192164791648750360308885314476597252960362792450860609699839"), // q
            new BigInteger("7fffffffffffffffffffffff7fffffffffff8000000000007ffffffffffc", 16), // a
            new BigInteger("6b016c3bdcf18941d0d654921475ca71a9db2fb27d1d37796185c2942c0a", 16)); // b

        ECParameterSpec spec = new ECParameterSpec(
            curve,
            curve.decodePoint(Hex.decode("020ffa963cdca8816ccc33b8642bedf905c3d358573d3f27fbbd3b3cb9aaaf")), // G
            new BigInteger("883423532389192164791648750360308884807550341691627752275345424702807307")); // n
       

        ECPrivateKeySpec priKey = new ECPrivateKeySpec(
            new BigInteger("876300101507107567501066130761671078357010671067781776716671676178726717"), // d
            spec);

        ECPublicKeySpec pubKey = new ECPublicKeySpec(
            curve.decodePoint(Hex.decode("025b6dc53bc61a2548ffb0f671472de6c9521a9d2d2534e65abfcbd5fe0c70")), // Q
            spec);

        Signature           sgr = Signature.getInstance("SHA1withECNR", "BC");
        KeyFactory          f = KeyFactory.getInstance("ECDSA", "BC");
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        SecureRandom    k = new FixedSecureRandom(kData);

        BigInteger mod_p = new BigInteger("57896044618658097711785492504343953926634992332820282019728792003956564821041"); //p

        ECCurve curve = new ECCurve.Fp(
            mod_p, // p
            new BigInteger("7"), // a
            new BigInteger("43308876546767276905765904595650931995942111794451039583252968842033849580414")); // b

        ECParameterSpec spec = new ECParameterSpec(
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        s = Signature.getInstance("ECGOST3410", "BC");
        g = KeyPairGenerator.getInstance("ECGOST3410", "BC");

        BigInteger mod_p = new BigInteger("57896044618658097711785492504343953926634992332820282019728792003956564821041"); //p

        ECCurve curve = new ECCurve.Fp(
            mod_p, // p
            new BigInteger("7"), // a
            new BigInteger("43308876546767276905765904595650931995942111794451039583252968842033849580414")); // b

        ECParameterSpec ecSpec = new ECParameterSpec(
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Related Classes of org.bouncycastle.math.ec.ECCurve

  • com.nimbusds.jose.crypto.ECDSAVerifier
  • org.bouncycastle.crypto.tls.TlsECCUtils
  • org.bouncycastle.jcajce.provider.asymmetric.dstu.BCDSTU4145PrivateKey
  • org.bouncycastle.jcajce.provider.asymmetric.dstu.BCDSTU4145PublicKey
  • org.bouncycastle.jcajce.provider.asymmetric.dstu.KeyPairGeneratorSpi
  • org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey
  • org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey
  • org.bouncycastle.jcajce.provider.asymmetric.ec.KeyPairGeneratorSpi$EC
  • org.bouncycastle.jcajce.provider.asymmetric.ecgost.BCECGOST3410PrivateKey
  • org.bouncycastle.jcajce.provider.asymmetric.ecgost.BCECGOST3410PublicKey
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