Package org.bouncycastle.crypto.params

Examples of org.bouncycastle.crypto.params.DSAParameters

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                return new RSAPrivateCrtKeyParameters(rsaPriv.getModulus(), rsaPub.getPublicExponent(), rsaPriv.getPrivateExponent(), rsaPriv.getPrimeP(), rsaPriv.getPrimeQ(), rsaPriv.getPrimeExponentP(), rsaPriv.getPrimeExponentQ(), rsaPriv.getCrtCoefficient());
            case PGPPublicKey.DSA:
                DSAPublicBCPGKey    dsaPub = (DSAPublicBCPGKey)pubPk.getKey();
                DSASecretBCPGKey dsaPriv = (DSASecretBCPGKey)privPk;

                return new DSAPrivateKeyParameters(dsaPriv.getX(), new DSAParameters(dsaPub.getP(), dsaPub.getQ(),  dsaPub.getG()));
            case PGPPublicKey.ELGAMAL_ENCRYPT:
            case PGPPublicKey.ELGAMAL_GENERAL:
                ElGamalPublicBCPGKey    elPub = (ElGamalPublicBCPGKey)pubPk.getKey();
                ElGamalSecretBCPGKey elPriv = (ElGamalSecretBCPGKey)privPk;
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     * @param message the message that will be verified later.
     */
    public BigInteger[] generateSignature(
        byte[] message)
    {
        DSAParameters   params = key.getParameters();
        BigInteger      m = calculateE(params.getQ(), message);
        BigInteger      k;
        int                  qBitLength = params.getQ().bitLength();

        do
        {
            k = new BigInteger(qBitLength, random);
        }
        while (k.compareTo(params.getQ()) >= 0);

        BigInteger  r = params.getG().modPow(k, params.getP()).mod(params.getQ());

        k = k.modInverse(params.getQ()).multiply(
                    m.add(((DSAPrivateKeyParameters)key).getX().multiply(r)));

        BigInteger  s = k.mod(params.getQ());

        BigInteger[]  res = new BigInteger[2];

        res[0] = r;
        res[1] = s;
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    public boolean verifySignature(
        byte[]      message,
        BigInteger  r,
        BigInteger  s)
    {
        DSAParameters   params = key.getParameters();
        BigInteger      m = calculateE(params.getQ(), message);
        BigInteger      zero = BigInteger.valueOf(0);

        if (zero.compareTo(r) >= 0 || params.getQ().compareTo(r) <= 0)
        {
            return false;
        }

        if (zero.compareTo(s) >= 0 || params.getQ().compareTo(s) <= 0)
        {
            return false;
        }

        BigInteger  w = s.modInverse(params.getQ());

        BigInteger  u1 = m.multiply(w).mod(params.getQ());
        BigInteger  u2 = r.multiply(w).mod(params.getQ());

        u1 = params.getG().modPow(u1, params.getP());
        u2 = ((DSAPublicKeyParameters)key).getY().modPow(u2, params.getP());

        BigInteger  v = u1.multiply(u2).mod(params.getP()).mod(params.getQ());

        return v.equals(r);
    }
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        else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_dsa))
        {
            DERInteger derX = (DERInteger)keyInfo.getPrivateKey();
            DEREncodable de = keyInfo.getAlgorithmId().getParameters();

            DSAParameters parameters = null;
            if (de != null)
            {
                DSAParameter params = DSAParameter.getInstance(de.getDERObject());
                parameters = new DSAParameters(params.getP(), params.getQ(), params.getG());
            }

            return new DSAPrivateKeyParameters(derX.getValue(), parameters);
        }
        else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_ecPublicKey))
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                 || algId.getObjectId().equals(OIWObjectIdentifiers.dsaWithSHA1))
        {
            DERInteger derY = (DERInteger)keyInfo.getPublicKey();
            DEREncodable de = keyInfo.getAlgorithmId().getParameters();

            DSAParameters parameters = null;
            if (de != null)
            {
                DSAParameter params = DSAParameter.getInstance(de.getDERObject());
                parameters = new DSAParameters(params.getP(), params.getQ(), params.getG());
            }

            return new DSAPublicKeyParameters(derY.getValue(), parameters);
        }
        else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_ecPublicKey))
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            {
                throw new InvalidAlgorithmParameterException("parameter object not a DSAParameterSpec");
            }
            DSAParameterSpec     dsaParams = (DSAParameterSpec)params;

            param = new DSAKeyGenerationParameters(random, new DSAParameters(dsaParams.getP(), dsaParams.getQ(), dsaParams.getG()));

            engine.init(param);
            initialised = true;
        }
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            {
                throw new InvalidAlgorithmParameterException("parameter object not a DSAParameterSpec");
            }
            DSAParameterSpec     dsaParams = (DSAParameterSpec)params;

            param = new DSAKeyGenerationParameters(random, new DSAParameters(dsaParams.getP(), dsaParams.getQ(), dsaParams.getG()));

            engine.init(param);
            initialised = true;
        }
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    }

    public AsymmetricCipherKeyPair generateKeyPair()
    {
        BigInteger      p, q, g, x, y;
        DSAParameters   dsaParams = param.getParameters();
        SecureRandom    random = param.getRandom();

        q = dsaParams.getQ();
        p = dsaParams.getP();
        g = dsaParams.getG();

        do
        {
            x = new BigInteger(160, random);
        }
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            else
            {
                pGen.init(strength, 20, new SecureRandom());
            }

            DSAParameters p = pGen.generateParameters();

            AlgorithmParameters params;

            try
            {
                params = AlgorithmParameters.getInstance("DSA", "BC");
                params.init(new DSAParameterSpec(p.getP(), p.getQ(), p.getG()));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }
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                 || algId.getObjectId().equals(OIWObjectIdentifiers.dsaWithSHA1))
        {
            DSAParameter    params = new DSAParameter((ASN1Sequence)keyInfo.getAlgorithmId().getParameters());
            DERInteger      derY = (DERInteger)keyInfo.getPublicKey();

            return new DSAPublicKeyParameters(derY.getValue(), new DSAParameters(params.getP(), params.getQ(), params.getG()));
        }
        else if (algId.getObjectId().equals(X9ObjectIdentifiers.id_ecPublicKey))
        {
            X962Parameters      params = new X962Parameters((DERObject)keyInfo.getAlgorithmId().getParameters());
            ECDomainParameters  dParams = null;
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Related Classes of org.bouncycastle.crypto.params.DSAParameters

  • com.jcraft.jsch.bc.KeyPairGenDSA
  • com.jcraft.jsch.bc.SignatureDSA
  • org.bouncycastle.crypto.generators.DSAKeyPairGenerator
  • org.bouncycastle.crypto.generators.DSAParametersGenerator
  • org.bouncycastle.crypto.signers.DSASigner
  • org.bouncycastle.crypto.test.DSATest
  • org.bouncycastle.crypto.util.PrivateKeyFactory
  • org.bouncycastle.crypto.util.PrivateKeyInfoFactory
  • org.bouncycastle.crypto.util.PublicKeyFactory
  • org.bouncycastle.jcajce.provider.asymmetric.dsa.AlgorithmParameterGeneratorSpi
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