Package org.bouncycastle.crypto.params

Examples of org.bouncycastle.crypto.params.ElGamalPublicKeyParameters

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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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                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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        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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            if (input.bitLength() >= p.bitLength())
            {
                throw new DataLengthException("input too large for ElGamal cipher.\n");
            }

            ElGamalPublicKeyParameters  pub = (ElGamalPublicKeyParameters)key;

            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  g = key.getParameters().getG();
            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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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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