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.

    {
        ECGenParameterSpec     ecSpec = new ECGenParameterSpec(name);


        KeyPairGenerator    g = KeyPairGenerator.getInstance("ECGOST3410", "BC");


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


        Signature sgr = Signature.getInstance("ECGOST3410", "BC");
        KeyPair   pair = g.generateKeyPair();
        PrivateKey sKey = pair.getPrivate();
        PublicKey vKey = pair.getPublic();

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        Signature           s = Signature.getInstance("DSA", "SUN");
        KeyPairGenerator    g = KeyPairGenerator.getInstance("DSA", "SUN");
        byte[]              data = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
        
        g.initialize(512, new SecureRandom());
        
        KeyPair p = g.generateKeyPair();
        
        PrivateKey  sKey = p.getPrivate();
        PublicKey   vKey = p.getPublic();

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    {
        byte[] dummySha1 = Hex.decode("01020304050607080910111213141516");


        KeyPairGenerator kpGen = KeyPairGenerator.getInstance("DSA", "BC");


        kpGen.initialize(512);


        KeyPair          kp = kpGen.generateKeyPair();


        Signature        sig = Signature.getInstance("NONEwithDSA", "BC");

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        // test exception
        //
        try
        {
            g.initialize(513, new SecureRandom());


            fail("illegal parameter 513 check failed.");
        }
        catch (IllegalArgumentException e)
        {

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            // expected
        }


        try
        {
            g.initialize(510, new SecureRandom());


            fail("illegal parameter 510 check failed.");
        }
        catch (IllegalArgumentException e)
        {

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            // expected
        }


        try
        {
            g.initialize(1025, new SecureRandom());


            fail("illegal parameter 1025 check failed.");
        }
        catch (IllegalArgumentException e)
        {

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        catch (IllegalArgumentException e)
        {
            // expected
        }


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


        KeyPair p = g.generateKeyPair();


        PrivateKey  sKey = p.getPrivate();
        PublicKey   vKey = p.getPublic();

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


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


        p = g.generateKeyPair();


        sKey = p.getPrivate();
        vKey = p.getPublic();

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        PrivateKey eck2 = (PrivateKey)serializeDeserialize(sKey);


        checkEquals(eck2, sKey);


        // Named curve parameter
        g.initialize(new ECNamedCurveGenParameterSpec("P-256"), new SecureRandom());


        p = g.generateKeyPair();


        sKey = p.getPrivate();
        vKey = p.getPublic();

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            curve,
            curve.decodePoint(Hex.decode("0457927098FA932E7C0A96D3FD5B706EF7E5F5C156E16B7E7C86038552E91D61D8EE5077C33FECF6F1A16B268DE469C3C7744EA9A971649FC7A9616305")), // G
            new BigInteger("220855883097298041197912187592864814557886993776713230936715041207411783"), // n
            BigInteger.valueOf(4)); // h
        
        g.initialize(ecSpec, new SecureRandom());


        p = g.generateKeyPair();


        sKey = p.getPrivate();
        vKey = p.getPublic();

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