Example usage for org.bouncycastle.crypto.generators DSAKeyPairGenerator DSAKeyPairGenerator

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.generators DSAKeyPairGenerator DSAKeyPairGenerator.

Prototype

DSAKeyPairGenerator

Source Link

Usage

From source file:com.geoxp.oss.CryptoHelperTest.java

License:Apache License

@Test
public void testSSHSignatureBlobSign_DSA() throws Exception {
    DSAKeyPairGenerator dsakpg = new DSAKeyPairGenerator();
    DSAParametersGenerator dpg = new DSAParametersGenerator();
    dpg.init(1024, 8, new SecureRandom());
    DSAParameters dsaparams = dpg.generateParameters();
    DSAKeyGenerationParameters params = new DSAKeyGenerationParameters(new SecureRandom(), dsaparams);
    dsakpg.init(params);//from w w w  .  ja  va 2 s .c  om

    AsymmetricCipherKeyPair kp = dsakpg.generateKeyPair();

    DSAPrivateKeyParameters privParams = (DSAPrivateKeyParameters) kp.getPrivate();
    DSAPublicKeyParameters pubParams = (DSAPublicKeyParameters) kp.getPublic();

    KeySpec ks = new DSAPrivateKeySpec(privParams.getX(), privParams.getParameters().getP(),
            privParams.getParameters().getQ(), privParams.getParameters().getG());
    PrivateKey priv = KeyFactory.getInstance("DSA").generatePrivate(ks);

    ks = new DSAPublicKeySpec(pubParams.getY(), pubParams.getParameters().getP(),
            pubParams.getParameters().getQ(), pubParams.getParameters().getG());
    PublicKey pub = KeyFactory.getInstance("DSA").generatePublic(ks);

    byte[] data = PLAINTEXT.getBytes();
    byte[] sig = CryptoHelper.sshSignatureBlobSign(data, priv);

    Assert.assertTrue(CryptoHelper.sshSignatureBlobVerify(data, sig, pub));
}

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From source file:com.licel.jcardsim.crypto.KeyPairImpl.java

License:Apache License

/**
 * Init key pair generation engine//from   w w  w . j a  v  a  2  s.c om
 */
private void initEngine() {
    // only public key params, see specification
    if (publicKey != null) {
        keyGenerationParameters = ((KeyImpl) publicKey).getKeyGenerationParameters(rnd);
    }
    switch (algorithm) {
    case KeyPair.ALG_RSA:
    case KeyPair.ALG_RSA_CRT:
        if (keyGenerationParameters == null) {
            keyGenerationParameters = RSAKeyImpl.getDefaultKeyGenerationParameters(keyLength, rnd);
        }
        engine = new RSAKeyPairGenerator();
        break;
    //
    case KeyPair.ALG_DSA:
        if (keyLength < 512 || keyLength > 1024 || keyLength % 64 != 0) {
            CryptoException.throwIt(CryptoException.ILLEGAL_VALUE);
        }
        if (keyGenerationParameters == null) {
            keyGenerationParameters = DSAKeyImpl.getDefaultKeyGenerationParameters(keyLength, rnd);
        }
        engine = new DSAKeyPairGenerator();
        break;

    // ecc
    case KeyPair.ALG_EC_F2M:
    case KeyPair.ALG_EC_FP:
        if (keyGenerationParameters == null) {
            keyGenerationParameters = ECKeyImpl.getDefaultKeyGenerationParameters(algorithm, keyLength, rnd);
        }
        engine = new ECKeyPairGenerator();
        break;

    default:
        CryptoException.throwIt(CryptoException.NO_SUCH_ALGORITHM);
        break;
    }
    engine.init(keyGenerationParameters);

}

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From source file:dorkbox.util.crypto.CryptoDSA.java

License:Apache License

/**
 * Generates the DSA key (using RSA and SHA1)
 * <p/>//w ww.  j  ava  2 s  .  c om
 * Note: this is here just for keeping track of how this is done. This should NOT be used, and instead use ECC crypto.
 */
public static AsymmetricCipherKeyPair generateKeyPair(SecureRandom secureRandom, int keyLength) {
    DSAKeyPairGenerator keyGen = new DSAKeyPairGenerator();

    DSAParametersGenerator dsaParametersGenerator = new DSAParametersGenerator();
    dsaParametersGenerator.init(keyLength, 20, secureRandom);
    DSAParameters generateParameters = dsaParametersGenerator.generateParameters();

    DSAKeyGenerationParameters params = new DSAKeyGenerationParameters(secureRandom, generateParameters);
    keyGen.init(params);
    return keyGen.generateKeyPair();
}

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From source file:org.xwiki.crypto.internal.asymmetric.generator.BcDSAKeyPairGenerator.java

License:Open Source License

@Override
public AsymmetricKeyPair generate(KeyGenerationParameters parameters) {
    org.bouncycastle.crypto.params.DSAParameters keyGenParams;

    if (parameters instanceof DSAKeyParametersGenerationParameters) {
        keyGenParams = getDsaParameters((DSAKeyGenerationParameters) parametersGenerator
                .generate((DSAKeyParametersGenerationParameters) parameters));
    } else if (parameters instanceof DSAKeyGenerationParameters) {
        keyGenParams = getDsaParameters((DSAKeyGenerationParameters) parameters);
    } else {//  ww w  .  j  av  a 2  s.  co  m
        throw new IllegalArgumentException(
                "Invalid parameters for DSA key generator: " + parameters.getClass().getName());
    }

    AsymmetricCipherKeyPairGenerator generator = new DSAKeyPairGenerator();
    generator.init(new org.bouncycastle.crypto.params.DSAKeyGenerationParameters(random.get(), keyGenParams));

    return getKeyPair(generator.generateKeyPair());
}

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