Examples of java.security.KeyPairGenerator.initialize()

java.security.KeyPairGenerator.initialize()
Initializes the key pair generator for a certain keysize using a default parameter set and the SecureRandom implementation of the highest-priority installed provider as the source of randomness. (If none of the installed providers supply an implementation of SecureRandom, a system-provided source of randomness is used.) @param keysize the keysize. This is analgorithm-specific metric, such as modulus length, specified in number of bits. @exception InvalidParameterException if the keysize is notsupported by this KeyPairGenerator object.


        try
        {
            KeyPairGenerator    g = KeyPairGenerator.getInstance("DSA", "SUN");


            g.initialize(512, new SecureRandom());


            KeyPair p = g.generateKeyPair();


            privKey = p.getPrivate();
            pubKey = p.getPublic();

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        PublicKey           pubKey;


        KeyPairGenerator    g = KeyPairGenerator.getInstance("GOST3410", "BC");
        GOST3410ParameterSpec gost3410P = new GOST3410ParameterSpec("GostR3410-94-CryptoPro-A");


        g.initialize(gost3410P, new SecureRandom());


        KeyPair p = g.generateKeyPair();


        privKey = p.getPrivate();
        pubKey = p.getPublic();

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    {
        DHParameterSpec  elParams = new DHParameterSpec(p, g, privateValueSize);
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ElGamal", "BC");
        byte[]           in = "This is a test".getBytes();


        keyGen.initialize(elParams);
        
        KeyPair         keyPair = keyGen.generateKeyPair();
        SecureRandom    rand = new SecureRandom();


        checkKeySize(privateValueSize, keyPair);

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        new BouncyCastleProvider().setParameter(ConfigurableProvider.DH_DEFAULT_PARAMS, elParams);


        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ElGamal", "BC");
        byte[]           in = "This is a test".getBytes();


        keyGen.initialize(p.bitLength());


        KeyPair         keyPair = keyGen.generateKeyPair();


        new BouncyCastleProvider().setParameter(ConfigurableProvider.DH_DEFAULT_PARAMS, elParams);

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    public static KeyPair generateRSAKeyPair()
        throws Exception
    {
        KeyPairGenerator  kpGen = KeyPairGenerator.getInstance("RSA", "BC");
    
        kpGen.initialize(1024, new SecureRandom());
    
        return kpGen.generateKeyPair();
    }
    
    public static X509Certificate generateRootCert(KeyPair pair)

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    private void generationTest(int keySize, String keyName, String sigName, String provider)
        throws Exception
    {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance(keyName, "BC");


        kpg.initialize(keySize);


        KeyPair kp = kpg.genKeyPair();


        Hashtable                   attrs = new Hashtable();

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        throws Exception
    {
        ECNamedCurveParameterSpec spec = ECNamedCurveTable.getParameterSpec(curveOid.getId());
        KeyPairGenerator ecGen = KeyPairGenerator.getInstance("ECDSA", "BC");


        ecGen.initialize(spec);


        //
        // set up the keys
        //
        PrivateKey          privKey;

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        throws Exception
    {
        String           algorithm = "GOST3411withECGOST3410";
        KeyPairGenerator ecGostKpg = KeyPairGenerator.getInstance("ECGOST3410", "BC");


        ecGostKpg.initialize(ECGOST3410NamedCurveTable.getParameterSpec("GostR3410-2001-CryptoPro-A"), new SecureRandom());


        //
        // set up the keys
        //
        KeyPair             pair = ecGostKpg.generateKeyPair();

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     // previous code found to cause a NullPointerException
    private void nullPointerTest()
        throws Exception
    {
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA", "BC");
        keyGen.initialize(1024, new SecureRandom());
        KeyPair pair = keyGen.generateKeyPair();


        Vector oids = new Vector();
        Vector values = new Vector();
        oids.add(X509Extensions.BasicConstraints);

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        ECParameterSpec ecSpec = new ECParameterSpec(
            curve,
            curve.decodePoint(Hex.decode("020ffa963cdca8816ccc33b8642bedf905c3d358573d3f27fbbd3b3cb9aaaf")), // G
            new BigInteger("883423532389192164791648750360308884807550341691627752275345424702807307")); // n


        g.initialize(ecSpec, new SecureRandom());


        KeyPair kp = g.generateKeyPair();


        req = new PKCS10CertificationRequest(
                "ECDSAWITHSHA1", new X509Name("CN=XXX"), kp.getPublic(), null, kp.getPrivate());

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