Package org.bouncycastle.crypto.params

Examples of org.bouncycastle.crypto.params.ElGamalPublicKeyParameters

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                return output;
            }
        }
        else
        {
            ElGamalPublicKeyParameters  pub = (ElGamalPublicKeyParameters)key;
            BigInteger                  input = new BigInteger(1, block);

            int                         pBitLength = p.bitLength();
            BigInteger                  k = new BigInteger(pBitLength, random);

            while (k.equals(ZERO) || (k.compareTo(p.subtract(TWO)) > 0))
            {
                k = new BigInteger(pBitLength, random);
            }

            BigInteger  gamma = g.modPow(k, p);
            BigInteger  phi = input.multiply(pub.getY().modPow(k, p)).mod(p);

            byte[]  out1 = gamma.toByteArray();
            byte[]  out2 = phi.toByteArray();
            byte[]  output = new byte[this.getOutputBlockSize()];
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        //
        // generate pair
        //
        AsymmetricCipherKeyPair         pair = kpGen.generateKeyPair();

        ElGamalPublicKeyParameters      pu = (ElGamalPublicKeyParameters)pair.getPublic();
        ElGamalPrivateKeyParameters     pv = (ElGamalPrivateKeyParameters)pair.getPrivate();

        ElGamalEngine    e = new ElGamalEngine();

        e.init(true, pu);
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        //
        // generate first pair
        //
        AsymmetricCipherKeyPair         pair = kpGen.generateKeyPair();

        ElGamalPublicKeyParameters      pu = (ElGamalPublicKeyParameters)pair.getPublic();
        ElGamalPrivateKeyParameters     pv = (ElGamalPrivateKeyParameters)pair.getPrivate();

        ElGamalEngine    e = new ElGamalEngine();

        e.init(true, pu);
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    {
        if (key instanceof ElGamalPublicKey)
        {
            ElGamalPublicKey    k = (ElGamalPublicKey)key;

            return new ElGamalPublicKeyParameters(k.getY(),
                new ElGamalParameters(k.getParameters().getP(), k.getParameters().getG()));
        }
        else if (key instanceof DHPublicKey)
        {
            DHPublicKey    k = (DHPublicKey)key;

            return new ElGamalPublicKeyParameters(k.getY(),
                new ElGamalParameters(k.getParams().getP(), k.getParams().getG()));
        }

        throw new InvalidKeyException("can't identify public key for El Gamal.");
    }
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        // calculate the public key.
        //
        y = g.modPow(x, p);

        return new AsymmetricCipherKeyPair(
                new ElGamalPublicKeyParameters(y, elParams),
                new ElGamalPrivateKeyParameters(x, elParams));
    }
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                return output;
            }
        }
        else
        {
            ElGamalPublicKeyParameters  pub = (ElGamalPublicKeyParameters)key;
            BigInteger                  input = new BigInteger(1, block);

            int                         pBitLength = p.bitLength();
            BigInteger                  k = new BigInteger(pBitLength, random);

            while (k.equals(ZERO) || (k.compareTo(p.subtract(TWO)) > 0))
            {
                k = new BigInteger(pBitLength, random);
            }

            BigInteger  gamma = g.modPow(k, p);
            BigInteger  phi = input.multiply(pub.getY().modPow(k, p)).mod(p);

            byte[]  out1 = gamma.toByteArray();
            byte[]  out2 = phi.toByteArray();
            byte[]  output = new byte[this.getOutputBlockSize()];
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                engine.init(param);
                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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                return new DSAPublicKeyParameters(dsaK.getY(), new DSAParameters(dsaK.getP(), dsaK.getQ(), dsaK.getG()));
            case PublicKeyAlgorithmTags.ELGAMAL_ENCRYPT:
            case PublicKeyAlgorithmTags.ELGAMAL_GENERAL:
                ElGamalPublicBCPGKey elK = (ElGamalPublicBCPGKey)publicPk.getKey();

                return new ElGamalPublicKeyParameters(elK.getY(), new ElGamalParameters(elK.getP(), elK.getG()));
            default:
                throw new PGPException("unknown public key algorithm encountered");
            }
        }
        catch (PGPException e)
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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))
        {
            DERInteger derY = (DERInteger)keyInfo.getPublicKey();
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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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Related Classes of org.bouncycastle.crypto.params.ElGamalPublicKeyParameters

  • org.bouncycastle.crypto.engines.ElGamalEngine
  • org.bouncycastle.crypto.generators.ElGamalKeyPairGenerator
  • org.bouncycastle.crypto.test.ElGamalTest
  • org.bouncycastle.crypto.util.PublicKeyFactory
  • 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
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