Package org.bouncycastle.crypto.params

Examples of org.bouncycastle.crypto.params.ElGamalParameters

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        else if (algId.getAlgorithm().equals(OIWObjectIdentifiers.elGamalAlgorithm))
        {
            ElGamalParameter params = new ElGamalParameter((ASN1Sequence)algId.getParameters());
            ASN1Integer derX = (ASN1Integer)keyInfo.parsePrivateKey();

            return new ElGamalPrivateKeyParameters(derX.getValue(), new ElGamalParameters(
                params.getP(), params.getG()));
        }
        else if (algId.getAlgorithm().equals(X9ObjectIdentifiers.id_dsa))
        {
            ASN1Integer derX = (ASN1Integer)keyInfo.parsePrivateKey();
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    }

    public AsymmetricCipherKeyPair generateKeyPair()
    {
        DHKeyGeneratorHelper helper = DHKeyGeneratorHelper.INSTANCE;
        ElGamalParameters egp = param.getParameters();
        DHParameters dhp = new DHParameters(egp.getP(), egp.getG(), null, egp.getL()); 

        BigInteger x = helper.calculatePrivate(dhp, param.getRandom());
        BigInteger y = helper.calculatePublic(dhp, x);

        return new AsymmetricCipherKeyPair(
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        else if (algId.getAlgorithm().equals(OIWObjectIdentifiers.elGamalAlgorithm))
        {
            ElGamalParameter params = new ElGamalParameter((ASN1Sequence)algId.getParameters());
            ASN1Integer derY = (ASN1Integer)keyInfo.parsePublicKey();

            return new ElGamalPublicKeyParameters(derY.getValue(), new ElGamalParameters(
                params.getP(), params.getG()));
        }
        else if (algId.getAlgorithm().equals(X9ObjectIdentifiers.id_dsa)
            || algId.getAlgorithm().equals(OIWObjectIdentifiers.dsaWithSHA1))
        {
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        else if (algId.getObjectId().equals(OIWObjectIdentifiers.elGamalAlgorithm))
        {
            ElGamalParameter    params = new ElGamalParameter((ASN1Sequence)keyInfo.getAlgorithmId().getParameters());
            DERInteger          derX = (DERInteger)keyInfo.getPrivateKey();

            return new ElGamalPrivateKeyParameters(derX.getValue(), new ElGamalParameters(params.getP(), params.getG()));
        }
        else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_dsa))
        {
            DSAParameter    params = new DSAParameter((ASN1Sequence)keyInfo.getAlgorithmId().getParameters());
            DERInteger      derX = (DERInteger)keyInfo.getPrivateKey();
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        else if (algId.getObjectId().equals(OIWObjectIdentifiers.elGamalAlgorithm))
        {
            ElGamalParameter    params = new ElGamalParameter((ASN1Sequence)keyInfo.getAlgorithmId().getParameters());
            DERInteger          derY = (DERInteger)keyInfo.getPublicKey();

            return new ElGamalPublicKeyParameters(derY.getValue(), new ElGamalParameters(params.getP(), params.getG()));
        }
        else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_dsa)
                 || algId.getObjectId().equals(OIWObjectIdentifiers.dsaWithSHA1))
        {
            DSAParameter    params = new DSAParameter((ASN1Sequence)keyInfo.getAlgorithmId().getParameters());
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        BigInteger p = safePrimes[0];
        BigInteger q = safePrimes[1];
        BigInteger g = DHParametersHelper.selectGenerator(p, q, random);

        return new ElGamalParameters(p, g);
    }
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    }

    public AsymmetricCipherKeyPair generateKeyPair()
    {
        BigInteger           p, x, y;
        ElGamalParameters    elParams = param.getParameters();

        p = elParams.getP();
        x = helper.calculatePrivate(p, param.getRandom(), elParams.getL());
        y = helper.calculatePublic(p, elParams.getG(), x);

        return new AsymmetricCipherKeyPair(
                new ElGamalPublicKeyParameters(y, elParams),
                new ElGamalPrivateKeyParameters(x, elParams));
    }
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            if (params instanceof ElGamalParameterSpec)
            {
                ElGamalParameterSpec     elParams = (ElGamalParameterSpec)params;

                param = new ElGamalKeyGenerationParameters(random, new ElGamalParameters(elParams.getP(), elParams.getG()));
            }
            else
            {
                DHParameterSpec     dhParams = (DHParameterSpec)params;

                param = new ElGamalKeyGenerationParameters(random, new ElGamalParameters(dhParams.getP(), dhParams.getG(), dhParams.getL()));
            }

            engine.init(param);
            initialised = true;
        }
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            else
            {
                pGen.init(strength, 20, new SecureRandom());
            }

            ElGamalParameters p = pGen.generateParameters();

            AlgorithmParameters params;

            try
            {
                params = AlgorithmParameters.getInstance("ElGamal", "BC");
                params.init(new DHParameterSpec(p.getP(), p.getG(), l));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }
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        else if (algId.getObjectId().equals(OIWObjectIdentifiers.elGamalAlgorithm))
        {
            ElGamalParameter    params = new ElGamalParameter((ASN1Sequence)keyInfo.getAlgorithmId().getParameters());
            DERInteger          derX = (DERInteger)keyInfo.getPrivateKey();

            return new ElGamalPrivateKeyParameters(derX.getValue(), new ElGamalParameters(params.getP(), params.getG()));
        }
        else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_dsa))
        {
            DSAParameter    params = new DSAParameter((ASN1Sequence)keyInfo.getAlgorithmId().getParameters());
            DERInteger      derX = (DERInteger)keyInfo.getPrivateKey();
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Related Classes of org.bouncycastle.crypto.params.ElGamalParameters

  • org.bouncycastle.crypto.generators.ElGamalKeyPairGenerator
  • org.bouncycastle.crypto.generators.ElGamalParametersGenerator
  • org.bouncycastle.crypto.test.ElGamalTest
  • org.bouncycastle.crypto.util.PrivateKeyFactory
  • org.bouncycastle.crypto.util.PublicKeyFactory
  • org.bouncycastle.jcajce.provider.asymmetric.elgamal.AlgorithmParameterGeneratorSpi
  • org.bouncycastle.jcajce.provider.asymmetric.elgamal.ElGamalUtil
  • org.bouncycastle.jcajce.provider.asymmetric.elgamal.KeyPairGeneratorSpi
  • org.bouncycastle.jce.provider.ElGamalUtil
  • org.bouncycastle.jce.provider.JDKAlgorithmParameterGenerator$ElGamal
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