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.

        
        // Testing DHIES with default curve using AES
        doTest("DHIESwithAES default", g, "DHIESwithAES", params);
        
        // Testing DHIES with 512-bit curve using AES
        g.initialize(512, new SecureRandom());
        doTest("DHIESwithAES 512-bit", g, "DHIESwithAES", params);
        
        // Testing DHIES with 1024-bit curve using AES
        g.initialize(1024, new SecureRandom());
        doTest("DHIESwithAES 1024-bit", g, "DHIESwithAES", params);

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        // Testing DHIES with 512-bit curve using AES
        g.initialize(512, new SecureRandom());
        doTest("DHIESwithAES 512-bit", g, "DHIESwithAES", params);
        
        // Testing DHIES with 1024-bit curve using AES
        g.initialize(1024, new SecureRandom());
        doTest("DHIESwithAES 1024-bit", g, "DHIESwithAES", params);
        
    }


    public void doTest(

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            curve,
            ECPointUtil.decodePoint(curve, Hex.decode("020ffa963cdca8816ccc33b8642bedf905c3d358573d3f27fbbd3b3cb9aaaf")), // G
            new BigInteger("883423532389192164791648750360308884807550341691627752275345424702807307"), // n
            1); // h


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


        KeyPair p = g.generateKeyPair();


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

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    private void testKeyConversion()
        throws Exception
    {
        KeyPairGenerator kpGen = KeyPairGenerator.getInstance("ECDSA", "BC");


        kpGen.initialize(new ECGenParameterSpec("prime192v1"));


        KeyPair pair = kpGen.generateKeyPair();


        PublicKey pubKey = ECKeyUtil.publicToExplicitParameters(pair.getPublic(), "BC");

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    private void testAdaptiveKeyConversion()
        throws Exception
    {
        KeyPairGenerator kpGen = KeyPairGenerator.getInstance("ECDSA", "BC");


        kpGen.initialize(new ECGenParameterSpec("prime192v1"));


        KeyPair pair = kpGen.generateKeyPair();


        final PrivateKey privKey = pair.getPrivate();
        final PublicKey  pubKey = pair.getPublic();

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        }


        // try encoding of wrong key
        kpGen = KeyPairGenerator.getInstance("RSA", "BC");


        kpGen.initialize(512);


        pair = kpGen.generateKeyPair();


        final PrivateKey privRsa = pair.getPrivate();
        final PublicKey  pubRsa = pair.getPublic();

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    private void testKeyPairGenerationWithOIDs()
        throws Exception
    {
        KeyPairGenerator kpGen = KeyPairGenerator.getInstance("ECDSA", "BC");


        kpGen.initialize(new ECGenParameterSpec(X9ObjectIdentifiers.prime192v1.getId()));
        kpGen.initialize(new ECGenParameterSpec(TeleTrusTObjectIdentifiers.brainpoolP160r1.getId()));
        kpGen.initialize(new ECGenParameterSpec(SECObjectIdentifiers.secp128r1.getId()));


        try
        {

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        throws Exception
    {
        KeyPairGenerator kpGen = KeyPairGenerator.getInstance("ECDSA", "BC");


        kpGen.initialize(new ECGenParameterSpec(X9ObjectIdentifiers.prime192v1.getId()));
        kpGen.initialize(new ECGenParameterSpec(TeleTrusTObjectIdentifiers.brainpoolP160r1.getId()));
        kpGen.initialize(new ECGenParameterSpec(SECObjectIdentifiers.secp128r1.getId()));


        try
        {
            kpGen.initialize(new ECGenParameterSpec("1.1"));

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    {
        KeyPairGenerator kpGen = KeyPairGenerator.getInstance("ECDSA", "BC");


        kpGen.initialize(new ECGenParameterSpec(X9ObjectIdentifiers.prime192v1.getId()));
        kpGen.initialize(new ECGenParameterSpec(TeleTrusTObjectIdentifiers.brainpoolP160r1.getId()));
        kpGen.initialize(new ECGenParameterSpec(SECObjectIdentifiers.secp128r1.getId()));


        try
        {
            kpGen.initialize(new ECGenParameterSpec("1.1"));

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        kpGen.initialize(new ECGenParameterSpec(TeleTrusTObjectIdentifiers.brainpoolP160r1.getId()));
        kpGen.initialize(new ECGenParameterSpec(SECObjectIdentifiers.secp128r1.getId()));


        try
        {
            kpGen.initialize(new ECGenParameterSpec("1.1"));


            fail("non-existant curve OID failed");
        }
        catch (InvalidAlgorithmParameterException e)
        {

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