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(Digest digest) 

Source Link

Usage

From source file:org.xipki.commons.security.util.DSAParameterCache.java

License:Open Source License

public static DSAParameterSpec getNewDSAParameterSpec(final int plength, final int qlength,
        final SecureRandom random) {
    final int certainty = 80;
    SecureRandom tmpRandom = (random == null) ? new SecureRandom() : random;
    DSAParametersGenerator paramGen = new DSAParametersGenerator(new SHA512Digest());
    DSAParameterGenerationParameters genParams = new DSAParameterGenerationParameters(plength, qlength,
            certainty, tmpRandom);//w  ww  .j av  a 2s.c  o  m
    paramGen.init(genParams);
    DSAParameters dsaParams = paramGen.generateParameters();
    return new DSAParameterSpec(dsaParams.getP(), dsaParams.getQ(), dsaParams.getG());
}

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From source file:org.xipki.security.KeyUtil.java

License:Open Source License

public static KeyPair generateDSAKeypair(final int pLength, final int qLength, final int certainty)
        throws Exception {
    DSAParametersGenerator paramGen = new DSAParametersGenerator(new SHA512Digest());
    DSAParameterGenerationParameters genParams = new DSAParameterGenerationParameters(pLength, qLength,
            certainty, new SecureRandom());
    paramGen.init(genParams);/* ww w  . ja v a2  s . co m*/
    DSAParameters dsaParams = paramGen.generateParameters();

    KeyPairGenerator kpGen = KeyPairGenerator.getInstance("DSA", "BC");
    DSAParameterSpec dsaParamSpec = new DSAParameterSpec(dsaParams.getP(), dsaParams.getQ(), dsaParams.getG());
    kpGen.initialize(dsaParamSpec, new SecureRandom());
    return kpGen.generateKeyPair();
}

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From source file:org.xipki.security.p11.iaik.IaikP11Slot.java

License:Open Source License

private PrivateKeyAndPKInfo generateDSAKeyPair(final Session session, final int pLength, final int qLength,
        final byte[] id, final String label) throws Exception {
    DSAParametersGenerator paramGen = new DSAParametersGenerator(new SHA512Digest());
    DSAParameterGenerationParameters genParams = new DSAParameterGenerationParameters(pLength, qLength, 80,
            new SecureRandom());
    paramGen.init(genParams);// w ww . ja va  2s  .  c  o m
    DSAParameters dsaParams = paramGen.generateParameters();

    DSAPrivateKey privateKey = new DSAPrivateKey();
    DSAPublicKey publicKey = new DSAPublicKey();

    setKeyAttributes(id, label, PKCS11Constants.CKK_DSA, privateKey, publicKey);

    publicKey.getPrime().setByteArrayValue(dsaParams.getP().toByteArray());
    publicKey.getSubprime().setByteArrayValue(dsaParams.getQ().toByteArray());
    publicKey.getBase().setByteArrayValue(dsaParams.getG().toByteArray());

    KeyPair kp = session.generateKeyPair(Mechanism.get(PKCS11Constants.CKM_DSA_KEY_PAIR_GEN), publicKey,
            privateKey);

    publicKey = (DSAPublicKey) kp.getPublicKey();
    BigInteger value = new BigInteger(1, publicKey.getValue().getByteArrayValue());

    ASN1EncodableVector v = new ASN1EncodableVector();
    v.add(new ASN1Integer(dsaParams.getP()));
    v.add(new ASN1Integer(dsaParams.getQ()));
    v.add(new ASN1Integer(dsaParams.getG()));
    ASN1Sequence dssParams = new DERSequence(v);

    SubjectPublicKeyInfo pkInfo = new SubjectPublicKeyInfo(
            new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, dssParams), new ASN1Integer(value));

    return new PrivateKeyAndPKInfo((DSAPrivateKey) kp.getPrivateKey(), pkInfo);
}

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