Examples of java.security.KeyPairGenerator

java.security.KeyPairGenerator
The KeyPairGenerator class is used to generate pairs of public and private keys. Key pair generators are constructed using the getInstance factory methods (static methods that return instances of a given class).
A Key pair generator for a particular algorithm creates a public/private key pair that can be used with this algorithm. It also associates algorithm-specific parameters with each of the generated keys.
There are two ways to generate a key pair: in an algorithm-independent manner, and in an algorithm-specific manner. The only difference between the two is the initialization of the object:
- Algorithm-Independent Initialization
  All key pair generators share the concepts of a keysize and a source of randomness. The keysize is interpreted differently for different algorithms (e.g., in the case of the DSA algorithm, the keysize corresponds to the length of the modulus). There is an {@link #initialize(int,java.security.SecureRandom) initialize}method in this KeyPairGenerator class that takes these two universally shared types of arguments. There is also one that takes just a keysize argument, and uses 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.)
  Since no other parameters are specified when you call the above algorithm-independent initialize methods, it is up to the provider what to do about the algorithm-specific parameters (if any) to be associated with each of the keys.
  If the algorithm is the DSA algorithm, and the keysize (modulus size) is 512, 768, or 1024, then the Sun provider uses a set of precomputed values for the p, q, and g parameters. If the modulus size is not one of the above values, the Sun provider creates a new set of parameters. Other providers might have precomputed parameter sets for more than just the three modulus sizes mentioned above. Still others might not have a list of precomputed parameters at all and instead always create new parameter sets.
- Algorithm-Specific Initialization
  For situations where a set of algorithm-specific parameters already exists (e.g., so-called community parameters in DSA), there are two {@link #initialize(java.security.spec.AlgorithmParameterSpec) initialize} methods that have an AlgorithmParameterSpecargument. One also has a SecureRandom argument, while the the other uses 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.)
In case the client does not explicitly initialize the KeyPairGenerator (via a call to an initialize method), each provider must supply (and document) a default initialization. For example, the Sun provider uses a default modulus size (keysize) of 1024 bits.
Note that this class is abstract and extends from KeyPairGeneratorSpi for historical reasons. Application developers should only take notice of the methods defined in this KeyPairGenerator class; all the methods in the superclass are intended for cryptographic service providers who wish to supply their own implementations of key pair generators. @author Benjamin Renaud @version 1.59, 04/21/06 @see java.security.spec.AlgorithmParameterSpec

    }


    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();


        attrs.put(X509Principal.C, "AU");
        attrs.put(X509Principal.O, "The Legion of the Bouncy Castle");

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     */
    private void createECRequest(String algorithm, DERObjectIdentifier algOid, DERObjectIdentifier curveOid)
        throws Exception
    {
        ECNamedCurveParameterSpec spec = ECNamedCurveTable.getParameterSpec(curveOid.getId());
        KeyPairGenerator ecGen = KeyPairGenerator.getInstance("ECDSA", "BC");


        ecGen.initialize(spec);


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


        KeyPair pair = ecGen.generateKeyPair();


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


        PKCS10CertificationRequest req = new PKCS10CertificationRequest(

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    private void createECGOSTRequest()
        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();
        PrivateKey          privKey = pair.getPrivate();
        PublicKey           pubKey = pair.getPublic();


        PKCS10CertificationRequest req = new PKCS10CertificationRequest(
                        algorithm, new X509Name("CN=XXX"), pubKey, null, privKey);

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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);
        values.add(new X509Extension(true, new DEROctetString(new BasicConstraints(true))));

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        {
            fail("Failed verify check gost3410EC_ExA.");
        }


        // elliptic curve openSSL
        KeyPairGenerator g = KeyPairGenerator.getInstance("ECDSA", "BC");


        ECCurve curve = new ECCurve.Fp(
            new BigInteger("883423532389192164791648750360308885314476597252960362792450860609699839"), // q
            new BigInteger("7fffffffffffffffffffffff7fffffffffff8000000000007ffffffffffc", 16), // a
            new BigInteger("6b016c3bdcf18941d0d654921475ca71a9db2fb27d1d37796185c2942c0a", 16)); // b


        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());
        if (!req.verify())
        {

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        IESCipher c1 = new org.bouncycastle.jcajce.provider.asymmetric.ec.IESCipher.ECIES();
        IESCipher c2 = new org.bouncycastle.jcajce.provider.asymmetric.ec.IESCipher.ECIES();
        IESParameterSpec params = new IESParameterSpec(derivation,encoding,128);


        // Testing ECIES with default curve in streaming mode
        KeyPairGenerator    g = KeyPairGenerator.getInstance("EC", "BC");
        doTest("ECIES with default", g, "ECIES", params);
        
        // Testing ECIES with 192-bit curve in streaming mode 
        g.initialize(192, new SecureRandom());
        doTest("ECIES with 192-bit", g, "ECIES", params);


        // Testing ECIES with 256-bit curve in streaming mode 
        g.initialize(256, new SecureRandom());
        doTest("ECIES with 256-bit", g, "ECIES", params);


        
        c1 = new IESCipher(new IESEngine(new ECDHBasicAgreement(), 
                new KDF2BytesGenerator(new SHA1Digest()),
                new HMac(new SHA1Digest()),
                new PaddedBufferedBlockCipher(new DESEngine())));
        
        c2 = new IESCipher(new IESEngine(new ECDHBasicAgreement(), 
                new KDF2BytesGenerator(new SHA1Digest()),
                new HMac(new SHA1Digest()),
                new PaddedBufferedBlockCipher(new DESEngine())));  
    
        params = new IESParameterSpec(derivation, encoding, 128, 128);
      
        // Testing ECIES with default curve using DES
        g = KeyPairGenerator.getInstance("EC", "BC");
        doTest("default", g, "ECIESwithDESEDE", params);
        
        // Testing ECIES with 192-bit curve using DES
        g.initialize(192, new SecureRandom());
        doTest("192-bit", g, "ECIESwithDESEDE", params);
        
        // Testing ECIES with 256-bit curve using DES
        g.initialize(256, new SecureRandom());
        doTest("256-bit", g, "ECIESwithDESEDE", params);
           
        
        c1 = new org.bouncycastle.jcajce.provider.asymmetric.ec.IESCipher.ECIESwithAES();
        c2 = new org.bouncycastle.jcajce.provider.asymmetric.ec.IESCipher.ECIESwithAES();
        params = new IESParameterSpec(derivation, encoding, 128, 128);
        
        // Testing ECIES with default curve using AES 
        g = KeyPairGenerator.getInstance("EC", "BC");
        doTest("default", g, "ECIESwithAES", params);
        
        // Testing ECIES with 192-bit curve using AES
        g.initialize(192, new SecureRandom());
        doTest("192-bit", g, "ECIESwithAES", params);
        
        // Testing ECIES with 256-bit curve using AES
        g.initialize(256, new SecureRandom());
        doTest("256-bit", g, "ECIESwithAES", params);
        
    }

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    }


    private void testNoExtraLocalKeyID(byte[] store1data)
        throws Exception
    {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA", "BC");


        kpg.initialize(512);


        KeyPair newPair = kpg.genKeyPair();


        KeyStore store1 = KeyStore.getInstance("PKCS12", "BC");


        store1.load(new ByteArrayInputStream(store1data), passwd);

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    public TestResult perform()
    {
        try
        {
            Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding", "BC");
            KeyPairGenerator fact = KeyPairGenerator.getInstance("RSA", "BC");
            fact.initialize(512, new SecureRandom());


            KeyPair keyPair = fact.generateKeyPair();


            PrivateKey  priKey = keyPair.getPrivate();
            PublicKey   pubKey = keyPair.getPublic();


            KeyGenerator keyGen = KeyGenerator.getInstance("DES", "BC");

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        String name)
        throws Exception
    {
        ECGenParameterSpec     ecSpec = new ECGenParameterSpec(name);


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


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


        //
        // a side
        //
        KeyPair aKeyPair = g.generateKeyPair();


        KeyAgreement aKeyAgree = KeyAgreement.getInstance("ECDHC", "BC");


        aKeyAgree.init(aKeyPair.getPrivate());


        //
        // b side
        //
        KeyPair bKeyPair = g.generateKeyPair();


        KeyAgreement bKeyAgree = KeyAgreement.getInstance("ECDHC", "BC");


        bKeyAgree.init(bKeyPair.getPrivate());

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        String name)
        throws Exception
    {
        ECGenParameterSpec     ecSpec = new ECGenParameterSpec(name);


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


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


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


        sgr.initSign(sKey);

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