Examples of DSAParameters

Examples of org.bouncycastle2.crypto.params.DSAParameters

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        if (key instanceof DSAPublicKey)
        {
            DSAPublicKey    k = (DSAPublicKey)key;

            return new DSAPublicKeyParameters(k.getY(),
                new DSAParameters(k.getParams().getP(), k.getParams().getQ(), k.getParams().getG()));
        }

        throw new InvalidKeyException("can't identify DSA public key: " + key.getClass().getName());
    }
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Examples of org.bouncycastle2.crypto.params.DSAParameters

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        if (key instanceof DSAPrivateKey)
        {
            DSAPrivateKey    k = (DSAPrivateKey)key;

            return new DSAPrivateKeyParameters(k.getX(),
                new DSAParameters(k.getParams().getP(), k.getParams().getQ(), k.getParams().getG()));
        }
                       
        throw new InvalidKeyException("can't identify DSA private key.");
    }
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Examples of org.bouncycastle2.crypto.params.DSAParameters

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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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Examples of org.bouncycastle2.crypto.params.DSAParameters

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            else
            {
                pGen.init(strength, 20, new SecureRandom());
            }

            DSAParameters p = pGen.generateParameters();

            AlgorithmParameters params;

            try
            {
                params = AlgorithmParameters.getInstance("DSA", "BC2");
                params.init(new DSAParameterSpec(p.getP(), p.getQ(), p.getG()));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }
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Examples of org.bouncycastle2.crypto.params.DSAParameters

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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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Examples of org.bouncycastle2.crypto.params.DSAParameters

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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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Examples of org.bouncycastle2.crypto.params.DSAParameters

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                if (p.isProbablePrime(certainty))
                {
                    BigInteger g = calculateGenerator_FIPS186_2(p, q, random);

                    return new DSAParameters(p, q, g, new DSAValidationParameters(seed, counter));
                }
            }
        }
    }
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Examples of org.bouncycastle2.crypto.params.DSAParameters

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//                        // TODO Should 'index' be a part of the validation parameters?
//                        return new DSAParameters(p, q, g, new DSAValidationParameters(seed, counter));
//                    }

                    BigInteger g = calculateGenerator_FIPS186_3_Unverifiable(p, q, random);
                    return new DSAParameters(p, q, g, new DSAValidationParameters(seed, counter));
                }

// 11.9 offset = offset + n + 1.      Comment: Increment offset; then, as part of
//                                    the loop in step 11, increment counter; if
//                                    counter < 4L, repeat steps 11.1 through 11.8.
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Examples of org.bouncycastle2.crypto.params.DSAParameters

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        this.param = (DSAKeyGenerationParameters)param;
    }

    public AsymmetricCipherKeyPair generateKeyPair()
    {
        DSAParameters dsaParams = param.getParameters();

        BigInteger x = generatePrivateKey(dsaParams.getQ(), param.getRandom());
        BigInteger y = calculatePublicKey(dsaParams.getP(), dsaParams.getG(), x);

        return new AsymmetricCipherKeyPair(
            new DSAPublicKeyParameters(y, dsaParams),
            new DSAPrivateKeyParameters(x, dsaParams));
    }
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