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

                pGen.init(strength, 20, new SecureRandom());
            }


            ElGamalParameters p = pGen.generateParameters();


            AlgorithmParameters params;


            try
            {
                params = AlgorithmParameters.getInstance("ElGamal", "BC");
                params.init(new DHParameterSpec(p.getP(), p.getG(), l));
            }
            catch (Exception e)
            {
                throw new RuntimeException(e.getMessage());
            }

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                random = new SecureRandom();
            }


            random.nextBytes(iv);


            AlgorithmParameters params;


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

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     * @tests java.security.AlgorithmParameters#getAlgorithm()
     */
    public void test_getAlgorithm() throws Exception {


        // test: null value
        AlgorithmParameters ap = new DummyAlgorithmParameters(null, p, null);
        assertNull(ap.getAlgorithm());


        // test: not null value
        ap = new DummyAlgorithmParameters(null, p, "AAA");
        assertEquals("AAA", ap.getAlgorithm());
    }

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            protected byte[] engineGetEncoded() throws IOException {
                return enc;
            }
        };


        AlgorithmParameters params = new DummyAlgorithmParameters(paramSpi, p,
                "algorithm");


        //
        // test: IOException if not initialized
        //
        try {
            params.getEncoded();
            fail("should not get encoded from un-initialized instance");
        } catch (IOException e) {
            // expected
        }


        //
        // test: corresponding spi method is invoked
        //
        params.init(new MyAlgorithmParameterSpec());
        assertSame(enc, params.getEncoded());
    }

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                assertEquals(strFormatParam, format);
                return enc;
            }
        };


        AlgorithmParameters params = new DummyAlgorithmParameters(paramSpi, p,
                "algorithm");


        //
        // test: IOException if not initialized
        //
        try {
            params.getEncoded(strFormatParam);
            fail("should not get encoded from un-initialized instance");
        } catch (IOException e) {
            // expected
        }


        //
        // test: corresponding spi method is invoked
        //
        params.init(new MyAlgorithmParameterSpec());
        assertSame(enc, params.getEncoded(strFormatParam));
        
        //
        // test: if format param is null
        // Regression test for HARMONY-2680
        //
        paramSpi = new MyAlgorithmParameters() {
            protected byte[] engineGetEncoded(String format) throws IOException {
                assertNull(format); // null is passed to spi-provider
                return enc;
            }
        };


        params = new DummyAlgorithmParameters(paramSpi, p, "algorithm");
        params.init(new MyAlgorithmParameterSpec());
        assertSame(enc, params.getEncoded(null));
    }

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  /**
     * @tests java.security.AlgorithmParameters#getInstance(String)
     */
    public void test_getInstanceLjava_lang_String() throws Exception {


        AlgorithmParameters ap = AlgorithmParameters.getInstance("ABC");


        checkUnititialized(ap);


        ap.init(new MyAlgorithmParameterSpec());


        checkAP(ap, p);
    }

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