Package org.bouncycastle.crypto.params

Examples of org.bouncycastle.crypto.params.ElGamalPrivateKeyParameters

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        //
        y = g.modPow(x, p);

        return new AsymmetricCipherKeyPair(
                new ElGamalPublicKeyParameters(y, elParams),
                new ElGamalPrivateKeyParameters(x, elParams));
    }
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    {
        if (key instanceof ElGamalPrivateKey)
        {
            ElGamalPrivateKey    k = (ElGamalPrivateKey)key;

            return new ElGamalPrivateKeyParameters(k.getX(),
                new ElGamalParameters(k.getParams().getP(), k.getParams().getG()));
        }
                       
        throw new InvalidKeyException("can't identify ElGamal private key.");
    }
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            initialised = true;
        }

        AsymmetricCipherKeyPair pair = engine.generateKeyPair();
        ElGamalPublicKeyParameters pub = (ElGamalPublicKeyParameters)pair.getPublic();
        ElGamalPrivateKeyParameters priv = (ElGamalPrivateKeyParameters)pair.getPrivate();

        return new KeyPair(new BCElGamalPublicKey(pub),
            new BCElGamalPrivateKey(priv));
    }
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    {
        if (key instanceof ElGamalPrivateKey)
        {
            ElGamalPrivateKey    k = (ElGamalPrivateKey)key;

            return new ElGamalPrivateKeyParameters(k.getX(),
                new ElGamalParameters(k.getParameters().getP(), k.getParameters().getG()));
        }
        else if (key instanceof DHPrivateKey)
        {
            DHPrivateKey    k = (DHPrivateKey)key;

            return new ElGamalPrivateKeyParameters(k.getX(),
                new ElGamalParameters(k.getParams().getP(), k.getParams().getG()));
        }
                       
        throw new InvalidKeyException("can't identify private key for El Gamal.");
    }
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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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        BigInteger x = helper.calculatePrivate(dhp, param.getRandom());
        BigInteger y = helper.calculatePublic(dhp, x);

        return new AsymmetricCipherKeyPair(
            new ElGamalPublicKeyParameters(y, egp),
            new ElGamalPrivateKeyParameters(x, egp));
    }
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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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        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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            System.arraycopy(in, inOff + in1.length, in2, 0, in2.length);

            BigInteger  gamma = new BigInteger(1, in1);
            BigInteger  phi = new BigInteger(1, in2);

            ElGamalPrivateKeyParameters  priv = (ElGamalPrivateKeyParameters)key;
            // a shortcut, which generally relies on p being prime amongst other things.
            // if a problem with this shows up, check the p and g values!
            BigInteger  m = gamma.modPow(p.subtract(ONE).subtract(priv.getX()), p).multiply(phi).mod(p);

            return BigIntegers.asUnsignedByteArray(m);
        }
        else // encryption
        {
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                initialised = true;
            }

            AsymmetricCipherKeyPair         pair = engine.generateKeyPair();
            ElGamalPublicKeyParameters      pub = (ElGamalPublicKeyParameters)pair.getPublic();
            ElGamalPrivateKeyParameters     priv = (ElGamalPrivateKeyParameters)pair.getPrivate();

            return new KeyPair(new JCEElGamalPublicKey(pub),
                               new JCEElGamalPrivateKey(priv));
        }
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Related Classes of org.bouncycastle.crypto.params.ElGamalPrivateKeyParameters

  • org.bouncycastle.crypto.engines.ElGamalEngine
  • org.bouncycastle.crypto.generators.ElGamalKeyPairGenerator
  • org.bouncycastle.crypto.test.ElGamalTest
  • org.bouncycastle.crypto.util.PrivateKeyFactory
  • org.bouncycastle.jcajce.provider.asymmetric.elgamal.ElGamalUtil
  • org.bouncycastle.jcajce.provider.asymmetric.elgamal.KeyPairGeneratorSpi
  • org.bouncycastle.jce.provider.ElGamalUtil
  • org.bouncycastle.jce.provider.JDKKeyPairGenerator$ElGamal
  • org.bouncycastle.openpgp.operator.bc.BcPGPKeyConverter
  • org.bouncycastle.openpgp.operator.bc.BcPublicKeyDataDecryptorFactory
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