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

        BigInteger  p)
        throws Exception
    {
        DHParameterSpec             dhParams = new DHParameterSpec(p, g, privateValueSize);


        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DH", "BC");


        keyGen.initialize(dhParams);


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


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


        checkKeySize(privateValueSize, aKeyPair);


        aKeyAgree.init(aKeyPair.getPrivate());


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


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


        checkKeySize(privateValueSize, bKeyPair);

View Full Code Here

    }


    private void testECDH(String algorithm)
        throws Exception
    {
        KeyPairGenerator    g = KeyPairGenerator.getInstance(algorithm, "BC");


        EllipticCurve curve = new EllipticCurve(
                new ECFieldFp(new BigInteger("883423532389192164791648750360308885314476597252960362792450860609699839")), // q
                new BigInteger("7fffffffffffffffffffffff7fffffffffff8000000000007ffffffffffc", 16), // a
                new BigInteger("6b016c3bdcf18941d0d654921475ca71a9db2fb27d1d37796185c2942c0a", 16)); // b


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


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


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


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


        aKeyAgree.init(aKeyPair.getPrivate());


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


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


        bKeyAgree.init(bKeyPair.getPrivate());

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    private void testDESAndDESede(BigInteger g, BigInteger p)
        throws Exception
    {
        DHParameterSpec             dhParams = new DHParameterSpec(p, g, 256);


        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DH", "BC");


        keyGen.initialize(dhParams);


        KeyPair kp = keyGen.generateKeyPair();


        KeyAgreement keyAgreement = KeyAgreement.getInstance("DH", "BC");


        keyAgreement.init(kp.getPrivate());
        keyAgreement.doPhase(kp.getPublic(), true);

View Full Code Here


    private void generationTest()
        throws Exception
    {
        Signature             s = Signature.getInstance("GOST3410", "BC");
        KeyPairGenerator      g = KeyPairGenerator.getInstance("GOST3410", "BC");
        byte[]                data = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
        GOST3410ParameterSpec gost3410P = new GOST3410ParameterSpec(CryptoProObjectIdentifiers.gostR3410_94_CryptoPro_A.getId());


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


        KeyPair p = g.generateKeyPair();


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


        s.initSign(sKey);


        s.update(data);


        byte[]  sigBytes = s.sign();


        s = Signature.getInstance("GOST3410", "BC");


        s.initVerify(vKey);


        s.update(data);


        if (!s.verify(sigBytes))
        {
            fail("GOST3410 verification failed");
        }


        //
        // default iniialisation test
        //
        s = Signature.getInstance("GOST3410", "BC");
        g = KeyPairGenerator.getInstance("GOST3410", "BC");


        p = g.generateKeyPair();


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


        s.initSign(sKey);


        s.update(data);


        sigBytes = s.sign();


        s = Signature.getInstance("GOST3410", "BC");


        s.initVerify(vKey);


        s.update(data);


        if (!s.verify(sigBytes))
        {
            fail("GOST3410 verification failed");
        }


        //
        // encoded test
        //
        KeyFactory f = KeyFactory.getInstance("GOST3410", "BC");


        X509EncodedKeySpec  x509s = new X509EncodedKeySpec(vKey.getEncoded());
        GOST3410PublicKey   k1 = (GOST3410PublicKey)f.generatePublic(x509s);


        if (!k1.getY().equals(((GOST3410PublicKey)vKey).getY()))
        {
            fail("public number not decoded properly");
        }


        PKCS8EncodedKeySpec  pkcs8 = new PKCS8EncodedKeySpec(sKey.getEncoded());
        GOST3410PrivateKey   k2 = (GOST3410PrivateKey)f.generatePrivate(pkcs8);


        if (!k2.getX().equals(((GOST3410PrivateKey)sKey).getX()))
        {
            fail("private number not decoded properly");
        }


        //
        // ECGOST3410 generation test
        //
        s = Signature.getInstance("ECGOST3410", "BC");
        g = KeyPairGenerator.getInstance("ECGOST3410", "BC");


        BigInteger mod_p = new BigInteger("57896044618658097711785492504343953926634992332820282019728792003956564821041"); //p


        ECCurve curve = new ECCurve.Fp(
            mod_p, // p
            new BigInteger("7"), // a
            new BigInteger("43308876546767276905765904595650931995942111794451039583252968842033849580414")); // b


        ECParameterSpec ecSpec = new ECParameterSpec(
                curve,
                    new ECPoint.Fp(curve,
                                   new ECFieldElement.Fp(mod_p,new BigInteger("2")), // x
                                   new ECFieldElement.Fp(mod_p,new BigInteger("4018974056539037503335449422937059775635739389905545080690979365213431566280"))), // y
                    new BigInteger("57896044618658097711785492504343953927082934583725450622380973592137631069619")); // q


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


        p = g.generateKeyPair();


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


        s.initSign(sKey);

View Full Code Here

//                    fail("encode/decode parameters failed");
//                }


        GOST3410ParameterSpec gost3410P = new GOST3410ParameterSpec(CryptoProObjectIdentifiers.gostR3410_94_CryptoPro_B.getId());


        KeyPairGenerator    g = KeyPairGenerator.getInstance("GOST3410", "BC");
        g.initialize(gost3410P, new SecureRandom());
        KeyPair p = g.generateKeyPair();


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


        Signature           s = Signature.getInstance("GOST3410", "BC");

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    public void performTest()
        throws Exception
    {   
        Signature           sig = Signature.getInstance("SHA1WithRSAEncryption", "BC");
        KeyPairGenerator    fact;
        KeyPair             keyPair;
        byte[]              data = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };


        fact = KeyPairGenerator.getInstance("RSA", "BC");


        fact.initialize(768, new SecureRandom());


        keyPair = fact.generateKeyPair();


        PrivateKey  signingKey = keyPair.getPrivate();
        PublicKey   verifyKey = keyPair.getPublic();
        
        testBadSig(signingKey, verifyKey);

View Full Code Here

    }


    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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                .readObject());
        KeyPair kp = null;
        boolean success = false;
        while (!success)
        {
            KeyPairGenerator kpg = KeyPairGenerator.getInstance("ECDSA");
            kpg.initialize(new ECParameterSpec(params.getCurve(),
                    params.getG(), params.getN(), params.getH(), params
                            .getSeed()));
            kp = kpg.generateKeyPair();
            // The very old Problem... we need a certificate chain to
            // save a private key...
            JCEECPublicKey pubKey = (JCEECPublicKey)kp.getPublic();
            if (!compress)
            {

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        BigInteger  g,
        BigInteger  p)
        throws Exception
    {
        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);


        Cipher  cipher = Cipher.getInstance("ElGamal", "BC");

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     * Create a random 1024 bit RSA key pair
     */
    public static KeyPair generateRSAKeyPair()
        throws Exception
    {
        KeyPairGenerator  kpGen = KeyPairGenerator.getInstance("RSA", "BC");
    
        kpGen.initialize(1024, new SecureRandom());
    
        return kpGen.generateKeyPair();
    }

View Full Code Here

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