Examples of java.security.AlgorithmParameters

java.security.AlgorithmParameters
This class is used as an opaque representation of cryptographic parameters.
An AlgorithmParameters object for managing the parameters for a particular algorithm can be obtained by calling one of the getInstance factory methods (static methods that return instances of a given class).
Once an AlgorithmParameters object is obtained, it must be initialized via a call to init, using an appropriate parameter specification or parameter encoding.
A transparent parameter specification is obtained from an AlgorithmParameters object via a call to getParameterSpec, and a byte encoding of the parameters is obtained via a call to getEncoded. @author Jan Luehe @version 1.27, 04/21/06 @see java.security.spec.AlgorithmParameterSpec @see java.security.spec.DSAParameterSpec @see KeyPairGenerator @since 1.2

                random = new SecureRandom();
            }


            random.nextBytes(iv);


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("RC5", BouncyCastleProvider.PROVIDER_NAME);
                params.init(new IvParameterSpec(iv));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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                random = new SecureRandom();
            }


            random.nextBytes(iv);


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("Noekeon", BouncyCastleProvider.PROVIDER_NAME);
                params.init(new IvParameterSpec(iv));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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                random = new SecureRandom();
            }


            random.nextBytes(iv);


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("CAST5", BouncyCastleProvider.PROVIDER_NAME);
                params.init(new IvParameterSpec(iv));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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            pGen.init(strength, 2, new SecureRandom());
        }


        GOST3410Parameters p = pGen.generateParameters();


        AlgorithmParameters params;


        try
        {
            params = AlgorithmParameters.getInstance("GOST3410", BouncyCastleProvider.PROVIDER_NAME);
            params.init(new GOST3410ParameterSpec(new GOST3410PublicKeyParameterSetSpec(p.getP(), p.getQ(), p.getA())));
        }
        catch (Exception e)
        {
            throw new RuntimeException(e.getMessage());
        }

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            throw new InvalidAlgorithmParameterException("No supported AlgorithmParameterSpec for RC2 parameter generation.");
        }


        protected AlgorithmParameters engineGenerateParameters()
        {
            AlgorithmParameters params;


            if (spec == null)
            {
                byte[] iv = new byte[8];


                if (random == null)
                {
                    random = new SecureRandom();
                }


                random.nextBytes(iv);


                try
                {
                    params = AlgorithmParameters.getInstance("RC2", BouncyCastleProvider.PROVIDER_NAME);
                    params.init(new IvParameterSpec(iv));
                }
                catch (Exception e)
                {
                    throw new RuntimeException(e.getMessage());
                }
            }
            else
            {
                try
                {
                    params = AlgorithmParameters.getInstance("RC2", BouncyCastleProvider.PROVIDER_NAME);
                    params.init(spec);
                }
                catch (Exception e)
                {
                    throw new RuntimeException(e.getMessage());
                }

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                random = new SecureRandom();
            }


            random.nextBytes(iv);


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("IDEA", BouncyCastleProvider.PROVIDER_NAME);
                params.init(new IvParameterSpec(iv));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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                random = new SecureRandom();
            }


            random.nextBytes(iv);


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("GOST28147", BouncyCastleProvider.PROVIDER_NAME);
                params.init(new IvParameterSpec(iv));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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            }


            //
            // get the parameters
            //
            AlgorithmParameters param = checkParameters(c, salt, iCount);


            //
            // try using parameters
            //
            c = Cipher.getInstance(algorithm, "BC");


            keySpec = new PBEKeySpec(password);


            c.init(Cipher.DECRYPT_MODE, fact.generateSecret(keySpec), param);


            checkParameters(c, salt, iCount);


            dec = c.doFinal(enc);


            if (!Arrays.areEqual(salt, dec))
            {
                fail("" + algorithm + "failed encryption/decryption test");
            }


            //
            // try using PBESpec
            //
            c = Cipher.getInstance(algorithm, "BC");


            keySpec = new PBEKeySpec(password);


            c.init(Cipher.DECRYPT_MODE, fact.generateSecret(keySpec), param.getParameterSpec(PBEParameterSpec.class));


            checkParameters(c, salt, iCount);


            dec = c.doFinal(enc);

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        }


        private AlgorithmParameters checkParameters(Cipher c, byte[] salt, int iCount)
            throws InvalidParameterSpecException
        {
            AlgorithmParameters param = c.getParameters();
            PBEParameterSpec spec = (PBEParameterSpec)param.getParameterSpec(PBEParameterSpec.class);


            if (!Arrays.areEqual(salt, spec.getSalt()))
            {
                fail("" + algorithm + "failed salt test");
            }

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    private void testParameters()
        throws Exception
    {
        AlgorithmParameterGenerator a = AlgorithmParameterGenerator.getInstance("DSA", "BC");
        a.init(512, random);
        AlgorithmParameters params = a.generateParameters();
        
        byte[] encodeParams = params.getEncoded();
        
        AlgorithmParameters a2 = AlgorithmParameters.getInstance("DSA", "BC");
        a2.init(encodeParams);
        
        // a and a2 should be equivalent!
        byte[] encodeParams_2 = a2.getEncoded();
        
        if (!areEqual(encodeParams, encodeParams_2))
        {
            fail("encode/decode parameters failed");
        }

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