Examples of java.security.AlgorithmParameterGenerator.generateParameters()

Class java.security.AlgorithmParameterGenerator

Examples of java.security.AlgorithmParameterGenerator.generateParameters()

java.security.AlgorithmParameterGenerator.generateParameters()
Generates the parameters. @return the new AlgorithmParameters object.

  public static void main(String[] args) throws Exception {
    AlgorithmParameterGenerator paramGen = AlgorithmParameterGenerator
        .getInstance(ALGORITHM);
    paramGen.init(1024);


    AlgorithmParameters params = paramGen.generateParameters();


    DHParameterSpec dhSpec = params.getParameterSpec(DHParameterSpec.class);
    System.out.println("l=" + dhSpec.getL());
    System.out.println("g=" + dhSpec.getG());
    System.out.println("p=" +dhSpec.getP());

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    {
        
        String s = "1.2.840.113549.3.2";
        
        AlgorithmParameterGenerator algorithmparametergenerator = AlgorithmParameterGenerator.getInstance(s);
        AlgorithmParameters algorithmparameters = algorithmparametergenerator.generateParameters();        
        ByteArrayInputStream bytearrayinputstream = new ByteArrayInputStream(algorithmparameters.getEncoded("ASN.1"));
        ASN1InputStream asn1inputstream = new ASN1InputStream(bytearrayinputstream);
        DERObject derobject = asn1inputstream.readObject();
        KeyGenerator keygenerator = KeyGenerator.getInstance(s);
        keygenerator.init(128);

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        if (side) {
            AlgorithmParameterGenerator paramGen = AlgorithmParameterGenerator.getInstance("DH");
            paramGen.init(512);


            KeyPairGenerator dh = KeyPairGenerator.getInstance("DH");
            dh.initialize(paramGen.generateParameters().getParameterSpec(DHParameterSpec.class));
            keyPair = dh.generateKeyPair();


            // send a half and get a half
            writeKey(keyPair.getPublic());
            otherHalf = KeyFactory.getInstance("DH").generatePublic(readKey());

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        int         size)
        throws Exception
    {
        AlgorithmParameterGenerator a = AlgorithmParameterGenerator.getInstance("DH", "BC");
        a.init(size, new SecureRandom());
        AlgorithmParameters params = a.generateParameters();


        byte[] encodeParams = params.getEncoded();


        AlgorithmParameters a2 = AlgorithmParameters.getInstance("DH", "BC");
        a2.init(encodeParams);

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        int         size)
        throws Exception
    {
        AlgorithmParameterGenerator a = AlgorithmParameterGenerator.getInstance("ElGamal", "BC");
        a.init(size, new SecureRandom());
        AlgorithmParameters params = a.generateParameters();


        byte[] encodeParams = params.getEncoded();


        AlgorithmParameters a2 = AlgorithmParameters.getInstance("ElGamal", "BC");
        a2.init(encodeParams);

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    private void testParameters()
        throws Exception
    {
        AlgorithmParameterGenerator a = AlgorithmParameterGenerator.getInstance("DSA", "BC");
        a.init(512, random);
        AlgorithmParameters params = a.generateParameters();
        
        byte[] encodeParams = params.getEncoded();
        
        AlgorithmParameters a2 = AlgorithmParameters.getInstance("DSA", "BC");
        a2.init(encodeParams);

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    {
        byte[] seed = Hex.decode("4783081972865EA95D43318AB2EAF9C61A2FC7BBF1B772A09017BDF5A58F4FF0");


        AlgorithmParameterGenerator a = AlgorithmParameterGenerator.getInstance("DSA", "BC");
        a.init(2048, new DSATestSecureRandom(seed));
        AlgorithmParameters params = a.generateParameters();


        DSAParameterSpec dsaP = (DSAParameterSpec)params.getParameterSpec(DSAParameterSpec.class);


        if (!dsaP.getQ().equals(new BigInteger("C24ED361870B61E0D367F008F99F8A1F75525889C89DB1B673C45AF5867CB467", 16)))
        {

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        {
            // should never happen, if this happens throw IOException instead
            throw new RuntimeException("Could not find a suitable javax.crypto provider", e);
        }


        AlgorithmParameters parameters = apg.generateParameters();


        ASN1InputStream input = new ASN1InputStream(parameters.getEncoded("ASN.1"));
        ASN1Primitive object = input.readObject();
        input.close();

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        int         size)
        throws Exception
    {
        AlgorithmParameterGenerator a = AlgorithmParameterGenerator.getInstance("DH", "BC");
        a.init(size, new SecureRandom());
        AlgorithmParameters params = a.generateParameters();


        byte[] encodeParams = params.getEncoded();


        AlgorithmParameters a2 = AlgorithmParameters.getInstance("DH", "BC");
        a2.init(encodeParams);

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        int         size)
        throws Exception
    {
        AlgorithmParameterGenerator a = AlgorithmParameterGenerator.getInstance("ElGamal", "BC");
        a.init(size, new SecureRandom());
        AlgorithmParameters params = a.generateParameters();


        byte[] encodeParams = params.getEncoded();


        AlgorithmParameters a2 = AlgorithmParameters.getInstance("ElGamal", "BC");
        a2.init(encodeParams);

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