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

Introduction

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

Prototype

public DSAParametersGenerator() 

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  ww .  j a v  a 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:dorkbox.util.crypto.CryptoDSA.java

License:Apache License

/**
 * Generates the DSA key (using RSA and SHA1)
 * <p/>/*from w w  w .ja va2 s .com*/
 * 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.BcDSAKeyParameterGenerator.java

License:Open Source License

/**
 * Create an instance of a DSA parameter generator using the appropriate hash algorithm.
 * @param hint hint of the hash algorithm to use.
 * @return a DSA parameter generator.//w  ww.ja  v a  2 s .c  o  m
 */
private DSAParametersGenerator getGenerator(String hint) {
    if (hint == null || hint.equals("SHA-1")) {
        return new DSAParametersGenerator();
    }

    DigestFactory factory;

    try {
        factory = manager.getInstance(DigestFactory.class, hint);
    } catch (ComponentLookupException e) {
        throw new UnsupportedOperationException("Cryptographic hash (digest) algorithm not found.", e);
    }

    if (!(factory instanceof AbstractBcDigestFactory)) {
        throw new IllegalArgumentException(
                "Requested cryptographic hash algorithm is not implemented by a factory compatible with this factory."
                        + " Factory found: " + factory.getClass().getName());
    }

    return new DSAParametersGenerator(((AbstractBcDigestFactory) factory).getDigestInstance());
}

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