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

Introduction

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

Prototype

public void init(int size, int certainty, SecureRandom random) 

Source Link

Document

initialise the key generator.

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

License:Apache License

/**
 * Generates the DSA key (using RSA and SHA1)
 * <p/>//from ww  w.j a  v a2s. co  m
 * 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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