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

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


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


        checkUnititialized(ap);


        ap.init(new byte[6]);


        checkAP(ap, p);
    }

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                    Class paramSpec) {
                return myParamSpec;
            }
        };


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


        //
        // test: InvalidParameterSpecException if not initialized
        //
        try {
            params.getParameterSpec(null);
            fail("No expected InvalidParameterSpecException");
        } catch (InvalidParameterSpecException e) {
            // expected
        }
        try {
            params.getParameterSpec(MyAlgorithmParameterSpec.class);
            fail("No expected InvalidParameterSpecException");
        } catch (InvalidParameterSpecException e) {
            // expected
        }


        //
        // test: corresponding spi method is invoked
        //
        params.init(new MyAlgorithmParameterSpec());
        assertSame(myParamSpec, params
                .getParameterSpec(MyAlgorithmParameterSpec.class));


        //
        // test: if paramSpec is null
        // Regression test for HARMONY-2733
        //
        paramSpi = new MyAlgorithmParameters() {


            protected AlgorithmParameterSpec engineGetParameterSpec(
                    Class paramSpec) {
                assertNull(paramSpec); // null is passed to spi-provider
                return null;
            }
        };


        params = new DummyAlgorithmParameters(paramSpi, p, "algorithm");
        params.init(new MyAlgorithmParameterSpec());
        assertNull(params.getParameterSpec(null));
    }

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


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


        checkUnititialized(ap);


        ap.init(new byte[6], "aaa");


        checkAP(ap, p);
    }

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    /**
     * @tests java.security.AlgorithmParameters#getProvider()
     */
    public void test_getProvider() throws Exception {
        // test: null value
        AlgorithmParameters ap = new DummyAlgorithmParameters(null, null, "AAA");
        assertNull(ap.getProvider());


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

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                assertSame(spec, paramSpec);
                runEngineInit_AlgParamSpec = true;
            }
        };


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


        params.init(spec);
        assertTrue(paramSpi.runEngineInit_AlgParamSpec);


        //
        // test: InvalidParameterSpecException if already initialized
        //
        try {
            params.init(spec);
            fail("No expected InvalidParameterSpecException");
        } catch (InvalidParameterSpecException e) {
            // expected
        }


        params = new DummyAlgorithmParameters(paramSpi, p, "algorithm");
        params.init(new byte[0]);
        try {
            params.init(spec);
            fail("No expected InvalidParameterSpecException");
        } catch (InvalidParameterSpecException e) {
            // expected
        }


        params = new DummyAlgorithmParameters(paramSpi, p, "algorithm");
        params.init(new byte[0], "format");
        try {
            params.init(spec);
            fail("No expected InvalidParameterSpecException");
        } catch (InvalidParameterSpecException e) {
            // expected
        }


        //
        // test: if paramSpec is null
        //
        paramSpi = new MyAlgorithmParameters() {


            protected void engineInit(AlgorithmParameterSpec paramSpec)
                    throws InvalidParameterSpecException {
                assertNull(paramSpec);// null is passed to spi-provider
                runEngineInit_AlgParamSpec = true;
            }
        };


        params = new DummyAlgorithmParameters(paramSpi, p, "algorithm");
        params.init((AlgorithmParameterSpec) null);
        assertTrue(paramSpi.runEngineInit_AlgParamSpec);
    }

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                runEngineInitB$ = true;
                assertSame(enc, params);
            }
        };


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


        params.init(enc);
        assertTrue(paramSpi.runEngineInitB$);


        //
        // test: IOException if already initialized
        //
        try {
            params.init(enc);
            fail("No expected IOException");
        } catch (IOException e) {
            // expected
        }


        params = new DummyAlgorithmParameters(paramSpi, p, "algorithm");
        params.init(new MyAlgorithmParameterSpec());
        try {
            params.init(enc);
            fail("No expected IOException");
        } catch (IOException e) {
            // expected
        }


        params = new DummyAlgorithmParameters(paramSpi, p, "algorithm");
        params.init(enc, "format");
        try {
            params.init(enc);
            fail("No expected IOException");
        } catch (IOException e) {
            // expected
        }


        //
        // test: if params is null
        //
        paramSpi = new MyAlgorithmParameters() {


            protected void engineInit(byte[] params) throws IOException {
                runEngineInitB$ = true;
                assertNull(params); // null is passed to spi-provider
            }
        };


        params = new DummyAlgorithmParameters(paramSpi, p, "algorithm");
        params.init((byte[]) null);
        assertTrue(paramSpi.runEngineInitB$);
    }

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                assertSame(enc, params);
                assertSame(strFormatParam, format);
            }
        };


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


        params.init(enc, strFormatParam);
        assertTrue(paramSpi.runEngineInitB$String);


        //
        // test: IOException if already initialized
        //
        try {
            params.init(enc, strFormatParam);
            fail("No expected IOException");
        } catch (IOException e) {
            // expected
        }


        params = new DummyAlgorithmParameters(paramSpi, p, "algorithm");
        params.init(new MyAlgorithmParameterSpec());
        try {
            params.init(enc, strFormatParam);
            fail("No expected IOException");
        } catch (IOException e) {
            // expected
        }


        params = new DummyAlgorithmParameters(paramSpi, p, "algorithm");
        params.init(enc);
        try {
            params.init(enc, strFormatParam);
            fail("No expected IOException");
        } catch (IOException e) {
            // expected
        }


        //
        // test: if params and format are null
        // Regression test for HARMONY-2724
        //
        paramSpi = new MyAlgorithmParameters() {


            protected void engineInit(byte[] params, String format)
                    throws IOException {


                runEngineInitB$String = true;


                // null is passed to spi-provider
                assertNull(params);
                assertNull(format);
            }
        };


        params = new DummyAlgorithmParameters(paramSpi, p, "algorithm");
        params.init(null, null);
        assertTrue(paramSpi.runEngineInitB$String);
    }

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            protected String engineToString() {
                return str;
            }
        };


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


        assertNull("unititialized", params.toString());


        params.init(new byte[0]);


        assertSame(str, params.toString());
    }

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    /**
     * Tests DSA AlgorithmParameters provider
     */
    public void testDSAProvider() throws Exception {
        AlgorithmParameters params = AlgorithmParameters.getInstance("DSA");


        assertEquals("Algorithm", "DSA", params.getAlgorithm());


        // init(AlgorithmParameterSpec)
        BigInteger p = BigInteger.ONE;
        BigInteger q = BigInteger.TEN;
        BigInteger g = BigInteger.ZERO;
        params.init(new DSAParameterSpec(p, q, g));


        // getEncoded() and getEncoded(String) (TODO verify returned encoding)
        byte[] enc = params.getEncoded();
        assertNotNull(enc);
        assertNotNull(params.getEncoded("ASN.1"));
        // TODO assertNotNull(params.getEncoded(null)); // HARMONY-2680


        // getParameterSpec(Class)
        DSAParameterSpec spec = params.getParameterSpec(DSAParameterSpec.class);
        assertEquals("p is wrong ", p, spec.getP());
        assertEquals("q is wrong ", q, spec.getQ());
        assertEquals("g is wrong ", g, spec.getG());


        // init(byte[])
        params = AlgorithmParameters.getInstance("DSA");
        params.init(enc);
        assertTrue("param encoded is different", Arrays.equals(enc, params
                .getEncoded()));


        // init(byte[], String)
        params = AlgorithmParameters.getInstance("DSA");
        params.init(enc, "ASN.1");
        assertTrue("param encoded is different", Arrays.equals(enc, params
                .getEncoded()));


        params = AlgorithmParameters.getInstance("DSA");
        try {
            params.init(enc, "DOUGLASMAWSON");
            fail("unsupported format should have raised IOException");
        } catch (Exception e) {
            // expected
        }
    }

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    /**
     * Tests OAEP AlgorithmParameters provider
     */
    public void testOAEPProvider() throws Exception {
        AlgorithmParameters params = AlgorithmParameters.getInstance("OAEP");


        assertEquals("Algorithm", "OAEP", params.getAlgorithm());
    }

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