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

Introduction

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

Prototype

public AsymmetricCipherKeyPair generateKeyPair() 

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 ww w . j a  va 2 s.  c o  m*/

    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  a  2s.  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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