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

        String name)
        throws Exception
    {
        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();


        sgr.initSign(sKey);

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        {
            return;
        }


        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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    private void testNONEwithDSA()
        throws Exception
    {
        byte[] dummySha1 = Hex.decode("01020304050607080910111213141516");


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


        kpGen.initialize(512);


        KeyPair          kp = kpGen.generateKeyPair();


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


        sig.initSign(kp.getPrivate());

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    private void testGeneration()
        throws Exception
    {
        Signature           s = Signature.getInstance("DSA", "BC");
        KeyPairGenerator    g = KeyPairGenerator.getInstance("DSA", "BC");
        byte[]              data = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };




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


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


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


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


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


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


        g.initialize(512, 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("DSA", "BC");


        s.initVerify(vKey);


        s.update(data);


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


        //
        // key decoding test - serialisation test
        //


        DSAPublicKey k1 = (DSAPublicKey)serializeDeserialize(vKey);


        checkPublic(k1, vKey);


        checkEquals(k1, vKey);


        DSAPrivateKey k2 = (DSAPrivateKey)serializeDeserialize(sKey);


        checkPrivateKey(k2, sKey);


        checkEquals(k2, sKey);


        if (!(k2 instanceof PKCS12BagAttributeCarrier))
        {
            fail("private key not implementing PKCS12 attribute carrier");
        }


        //
        // ECDSA Fp generation test
        //
        s = Signature.getInstance("ECDSA", "BC");
        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());


        p = g.generateKeyPair();


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


        s.initSign(sKey);


        s.update(data);


        sigBytes = s.sign();


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


        s.initVerify(vKey);


        s.update(data);


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


        //
        // key decoding test - serialisation test
        //


        PublicKey eck1 = (PublicKey)serializeDeserialize(vKey);


        checkEquals(eck1, vKey);


        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();


        s.initSign(sKey);


        s.update(data);


        sigBytes = s.sign();


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


        s.initVerify(vKey);


        s.update(data);


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


        //
        // key decoding test - serialisation test
        //


        eck1 = (PublicKey)serializeDeserialize(vKey);


        checkEquals(eck1, vKey);


        eck2 = (PrivateKey)serializeDeserialize(sKey);


        checkEquals(eck2, sKey);


        //
        // ECDSA F2m generation test
        //
        s = Signature.getInstance("ECDSA", "BC");
        g = KeyPairGenerator.getInstance("ECDSA", "BC");


        curve = new ECCurve.F2m(
                239, // m
                36, // k
                new BigInteger("32010857077C5431123A46B808906756F543423E8D27877578125778AC76", 16), // a
                new BigInteger("790408F2EEDAF392B012EDEFB3392F30F4327C0CA3F31FC383C422AA8C16", 16)); // b
        
        ecSpec = new ECParameterSpec(
            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();


        s.initSign(sKey);

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            fail("encode/decode parameters failed");
        }
        
        DSAParameterSpec dsaP = (DSAParameterSpec)params.getParameterSpec(DSAParameterSpec.class);
        
        KeyPairGenerator    g = KeyPairGenerator.getInstance("DSA", "BC");
        g.initialize(dsaP, new SecureRandom());
        KeyPair p = g.generateKeyPair();
        
        PrivateKey  sKey = p.getPrivate();
        PublicKey   vKey = p.getPublic();
        
        Signature           s = Signature.getInstance("DSA", "BC");

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            "EF5AF477AFED029F485B5597739F5D0240F67C2D948A6279", 16)))
        {
            fail("G incorrect");
        }


        KeyPairGenerator    g = KeyPairGenerator.getInstance("DSA", "BC");
        g.initialize(dsaP, new FixedSecureRandom(Hex.decode("0CAF2EF547EC49C4F3A6FE6DF4223A174D01F2C115D49A6F73437C29A2A8458C")));
        KeyPair p = g.generateKeyPair();


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


        if (!vKey.getY().equals(new BigInteger(

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      calEnd.add(Calendar.YEAR, 10);


      // generate the public and private RSA key pair using the
      // BouncyCastle provider with a KEY_SIZE bit key size for
      // the digital signature
      final KeyPairGenerator keyPairGenerator = KeyPairGenerator
          .getInstance("RSA");
      keyPairGenerator.initialize(KEY_SIZE, new SecureRandom());
      KeyPair kp = keyPairGenerator.generateKeyPair();


      // final PKCS12BagAttributeCarrier bagAttr
      // =(PKCS12BagAttributeCarrier) kp.getPrivate();
      // bagAttr.setBagAttribute(PKCSObjectIdentifiers.pkcs_9_at_localKeyId,
      // new SubjectKeyIdentifier(kp.getPublic().getEncoded()));

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  private PrivateKey privateKey;
  private PublicKey publicKey;


  GenerateKeys(String newAlg) throws NoSuchAlgorithmException {
    algorithm = newAlg;
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance(algorithm);
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
    keyGen.initialize(1024, random);
    random.setSeed(1024);
    KeyPair pair = keyGen.generateKeyPair();
    privateKey = pair.getPrivate();
    publicKey = pair.getPublic();
  }

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        }
    }


    private KeyPair generateKeyPair(String algorithm) {
        try {
            KeyPairGenerator generator = SecurityUtils.getKeyPairGenerator(algorithm);
            if (keySize != 0) {
                generator.initialize(keySize);
            }
            log.info("Generating host key...");
            KeyPair kp = generator.generateKeyPair();
            return kp;
        } catch (Exception e) {
            log.warn("Unable to generate keypair", e);
            return null;
        }

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        DHPublicKey publicKey = (DHPublicKey) this.getValueLinkPublicKey();
        DHParameterSpec dhParamSpec = publicKey.getParams();
        //Debug.logInfo(dhParamSpec.getP().toString() + " / " + dhParamSpec.getG().toString(), module);


        // create the public/private key pair using parameters defined by valuelink
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DH");
        keyGen.initialize(dhParamSpec);
        KeyPair keyPair = keyGen.generateKeyPair();


        return keyPair;
    }

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