Examples of java.security.KeyPairGenerator$Delegate

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

        //
        // ECDSA generation test
        //
        byte[]              data = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
        Signature s = Signature.getInstance("ECDSA", "BC");
        KeyPairGenerator g = KeyPairGenerator.getInstance("ECDSA", "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());


        KeyPair p = g.generateKeyPair();


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


        s.initSign(sKey);

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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");


        SubjectPublicKeyInfo info = SubjectPublicKeyInfo.getInstance(ASN1Primitive.fromByteArray(pubKey.getEncoded()));
        X962Parameters params = X962Parameters.getInstance(info.getAlgorithmId().getParameters());

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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();


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


        // raw interface tests
        s.initSign(new PrivateKey()
        {
            public String getAlgorithm()
            {
                return privKey.getAlgorithm();
            }


            public String getFormat()
            {
                return privKey.getFormat();
            }


            public byte[] getEncoded()
            {
                return privKey.getEncoded();
            }
        });


        s.initVerify(new PublicKey()
        {
            public String getAlgorithm()
            {
                return pubKey.getAlgorithm();
            }


            public String getFormat()
            {
                return pubKey.getFormat();
            }


            public byte[] getEncoded()
            {
                return pubKey.getEncoded();
            }
        });




        s.initSign(new ECPrivateKey()
        {
            public String getAlgorithm()
            {
                return privKey.getAlgorithm();
            }


            public String getFormat()
            {
                return privKey.getFormat();
            }


            public byte[] getEncoded()
            {
                return privKey.getEncoded();
            }


            public BigInteger getS()
            {
                return ((ECPrivateKey)privKey).getS();
            }


            public ECParameterSpec getParams()
            {
                return ((ECPrivateKey)privKey).getParams();
            }
        });


        s.initVerify(new ECPublicKey()
        {
            public String getAlgorithm()
            {
                return pubKey.getAlgorithm();
            }


            public String getFormat()
            {
                return pubKey.getFormat();
            }


            public byte[] getEncoded()
            {
                return pubKey.getEncoded();
            }


            public ECPoint getW()
            {
                return ((ECPublicKey)pubKey).getW();
            }


            public ECParameterSpec getParams()
            {
                return ((ECPublicKey)pubKey).getParams();
            }
        });


        try
        {
            s.initSign(new PrivateKey()
            {
                public String getAlgorithm()
                {
                    return privKey.getAlgorithm();
                }


                public String getFormat()
                {
                    return privKey.getFormat();
                }


                public byte[] getEncoded()
                {
                    return null;
                }
            });


            fail("no exception thrown!!!");
        }
        catch (InvalidKeyException e)
        {
            // ignore
        }


        try
        {
            s.initVerify(new PublicKey()
            {
                public String getAlgorithm()
                {
                    return pubKey.getAlgorithm();
                }


                public String getFormat()
                {
                    return pubKey.getFormat();
                }


                public byte[] getEncoded()
                {
                    return null;
                }
            });


            fail("no exception thrown!!!");
        }
        catch (InvalidKeyException e)
        {
            // ignore
        }


        // try bogus encoding
        try
        {
            s.initSign(new PrivateKey()
            {
                public String getAlgorithm()
                {
                    return privKey.getAlgorithm();
                }


                public String getFormat()
                {
                    return privKey.getFormat();
                }


                public byte[] getEncoded()
                {
                    return new byte[20];
                }
            });


            fail("no exception thrown!!!");
        }
        catch (InvalidKeyException e)
        {
            // ignore
        }


        try
        {
            s.initVerify(new PublicKey()
            {
                public String getAlgorithm()
                {
                    return pubKey.getAlgorithm();
                }


                public String getFormat()
                {
                    return pubKey.getFormat();
                }


                public byte[] getEncoded()
                {
                    return new byte[20];
                }
            });


            fail("no exception thrown!!!");
        }
        catch (InvalidKeyException e)
        {
            // ignore
        }


        // 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();


        try

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


            fail("non-existant curve OID failed");
        }
        catch (InvalidAlgorithmParameterException e)
        {
            if (!"unknown curve OID: 1.1".equals(e.getMessage()))
            {
                fail("OID message check failed");
            }
        }


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


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

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    {
        KeyStore store = KeyStore.getInstance(storeName, "BC");


        store.load(null, null);


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


        gen.initialize(1024, new SecureRandom());


        KeyPair         pair = gen.generateKeyPair();
        RSAPrivateKey   privKey = (RSAPrivateKey)pair.getPrivate();
        RSAPublicKey    pubKey = (RSAPublicKey)pair.getPublic();
        BigInteger      modulus = privKey.getModulus();
        BigInteger      privateExponent = privKey.getPrivateExponent();

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    }


    private void testBCAPI()
        throws Exception
    {
        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


        ConfigurableProvider config = (ConfigurableProvider)Security.getProvider("BC");


        config.setParameter(ConfigurableProvider.EC_IMPLICITLY_CA, ecSpec);


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


        KeyPair p = g.generateKeyPair();


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


        testECDSA(sKey, vKey);

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    }


    private void testKeyFactory()
        throws Exception
    {
        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


        ConfigurableProvider config = (ConfigurableProvider)Security.getProvider("BC");


        config.setParameter(ConfigurableProvider.EC_IMPLICITLY_CA, ecSpec);


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


        KeyPair p = g.generateKeyPair();


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


        KeyFactory fact = KeyFactory.getInstance("ECDSA", "BC");

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    }


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


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


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




        ConfigurableProvider config = (ConfigurableProvider)Security.getProvider("BC");


        config.setParameter(ConfigurableProvider.EC_IMPLICITLY_CA, ecSpec);


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


        KeyPair p = g.generateKeyPair();


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


        testECDSA(sKey, vKey);

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    }


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


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


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




        ConfigurableProvider config = (ConfigurableProvider)Security.getProvider("BC");


        config.setParameter(ConfigurableProvider.THREAD_LOCAL_EC_IMPLICITLY_CA, ecSpec);


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


        KeyPair p = g.generateKeyPair();


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


        testECDSA(sKey, vKey);

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    }


    private void testECMQV()
        throws Exception
    {
        KeyPairGenerator g = KeyPairGenerator.getInstance("ECMQV", "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());


        //
        // U side
        //
        KeyPair U1 = g.generateKeyPair();
        KeyPair U2 = g.generateKeyPair();


        KeyAgreement uAgree = KeyAgreement.getInstance("ECMQV", "BC");
        uAgree.init(new MQVPrivateKeySpec(U1.getPrivate(), U2.getPrivate(), U2.getPublic()));


        //
        // V side
        //
        KeyPair V1 = g.generateKeyPair();
        KeyPair V2 = g.generateKeyPair();


        KeyAgreement vAgree = KeyAgreement.getInstance("ECMQV", "BC");
        vAgree.init(new MQVPrivateKeySpec(V1.getPrivate(), V2.getPrivate(), V2.getPublic()));


        //

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