Examples of java.security.spec.ECFieldFp

java.security.spec.ECFieldFp
This immutable class defines an elliptic curve (EC) prime finite field. @see ECField @author Valerie Peng @version 1.4, 11/17/05 @since 1.5

     * Test preconditions: pass <code>null</code> as mentioned parameters<br>
     * Expected: must throw <code>NullPointerException</code>
     */
    public final void testEllipticCurveECFieldBigIntegerBigInteger02() {
        // test case 1 parameters set
        ECFieldFp f = null;
        BigInteger a = BigInteger.ONE;
        BigInteger b = BigInteger.valueOf(19L);


        // perform test case 1
        try {
            new EllipticCurve(f, a, b);
            fail("#1: Expected NPE not thrown");
        } catch (NullPointerException ok) {}


        // test case 2 parameters set,
        f = new ECFieldFp(BigInteger.valueOf(23L));
        a = null;
        b = BigInteger.valueOf(19L);
        // perform test case 2
        try {
            new EllipticCurve(f, a, b);
            fail("#2: Expected NPE not thrown");
        } catch (NullPointerException ok) {}


        // test case 3 parameters set,
        f = new ECFieldFp(BigInteger.valueOf(23L));
        a = BigInteger.ONE;
        b = null;
        // perform test case 3
        try {
            new EllipticCurve(f, a, b);

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     * Expected: must throw <code>IllegalArgumentException</code>
     */
    public final void testEllipticCurveECFieldBigIntegerBigInteger03() {
        // test case 1 parameters set,
        // a is not in field
        ECFieldFp f = new ECFieldFp(BigInteger.valueOf(23L));
        BigInteger a = BigInteger.valueOf(24L);
        BigInteger b = BigInteger.valueOf(19L);


        // perform test case 1
        try {
            new EllipticCurve(f, a, b);
            fail("#1: Expected IAE not thrown");
        } catch (IllegalArgumentException ok) {}


        // test case 1.1 parameters set,
        // a is not in field
        f = new ECFieldFp(BigInteger.valueOf(23L));
        a = BigInteger.valueOf(23L);
        b = BigInteger.valueOf(19L);
        // perform test case 1.1
        try {
            new EllipticCurve(f, a, b);
            fail("#1.1: Expected IAE not thrown");
        } catch (IllegalArgumentException ok) {}


        // test case 2 parameters set,
        // b is not in field
        f = new ECFieldFp(BigInteger.valueOf(23L));
        a = BigInteger.valueOf(19L);
        b = BigInteger.valueOf(24L);
        // perform test case 2
        try {
            new EllipticCurve(f, a, b);
            fail("#2: Expected IAE not thrown");
        } catch (IllegalArgumentException ok) {}


        // test case 3 parameters set,
        // both a and b are not in field
        f = new ECFieldFp(BigInteger.valueOf(23L));
        a = BigInteger.valueOf(25L);
        b = BigInteger.valueOf(240L);
        // perform test case 3
        try {
            new EllipticCurve(f, a, b);

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     * created using valid parameters<br>
     * Expected: must return <code>seed</code> which is equal
     * to the one passed to the constructor
     */
    public final void testGetSeed01() {
        ECFieldFp f = new ECFieldFp(BigInteger.valueOf(23L));
        BigInteger a = BigInteger.ONE;
        BigInteger b = BigInteger.valueOf(19L);
        byte[] seed = new byte[24];
        EllipticCurve c = new EllipticCurve(f, a, b, seed);
        byte[] seedRet = c.getSeed();

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     * created using valid parameters; <code>getSeed()</code>
     * called and then returned array modified<br>
     * Expected: internal state must not be affected by the modification
     */
    public final void testGetSeed02() {
        ECFieldFp f = new ECFieldFp(BigInteger.valueOf(23L));
        BigInteger a = BigInteger.ONE;
        BigInteger b = BigInteger.valueOf(19L);
        byte[] seed = new byte[24];
        EllipticCurve c = new EllipticCurve(f, a, b, seed.clone());
        byte[] seedRet = c.getSeed();

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     * Test preconditions: <code>ECFieldF2m</code> instance
     * created using valid parameters<br>
     * Expected: repeated method calls must return different refs
     */
    public final void testGetSeed03() {
        ECFieldFp f = new ECFieldFp(BigInteger.valueOf(23L));
        BigInteger a = BigInteger.ONE;
        BigInteger b = BigInteger.valueOf(19L);
        byte[] seed = new byte[24];
        EllipticCurve c = new EllipticCurve(f, a, b, seed);
        c.getSeed();

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     * @tests java.security.spec.EllipticCurve#getSeed()
     * Assertion: null if not specified
     */
    public final void testGetSeed04() {
        //Regression for HARMONY-732
        ECFieldFp f = new ECFieldFp(BigInteger.valueOf(23L));
        BigInteger a = BigInteger.ONE;
        assertNull(new EllipticCurve(f, a, a).getSeed());
    }

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     * Test preconditions: see test comments<br>
     * Expected: all objects in this test must be equal
     */
    public final void testEqualsObject01() {
        // test case 1: must be equal to itself
        EllipticCurve c2 = null, c1 = new EllipticCurve(new ECFieldFp(
                BigInteger.valueOf(23L)), BigInteger.ONE, BigInteger
                .valueOf(19L));
        assertTrue(c1.equals(c1));


        // test case 2: equal objects
        c1 = new EllipticCurve(new ECFieldFp(BigInteger.valueOf(23L)),
                BigInteger.ONE, BigInteger.valueOf(19L));
        c2 = new EllipticCurve(new ECFieldFp(BigInteger.valueOf(23L)),
                BigInteger.valueOf(1L), BigInteger.valueOf(19L));
        assertTrue(c1.equals(c2) && c2.equals(c1));


        // test case 3: equal objects with seed not null
        c1 = new EllipticCurve(new ECFieldFp(BigInteger.valueOf(23L)),
                BigInteger.ONE, BigInteger.valueOf(19L), new byte[24]);
        c2 = new EllipticCurve(new ECFieldFp(BigInteger.valueOf(23L)),
                BigInteger.valueOf(1L), BigInteger.valueOf(19L), new byte[24]);
        assertTrue(c1.equals(c2) && c2.equals(c1));


        // test case 4: equal object and subclass object
        c1 = new EllipticCurve(new ECFieldFp(BigInteger.valueOf(23L)),
                BigInteger.ONE, BigInteger.valueOf(19L), new byte[24]);
        MyEllipticCurve c3 = new MyEllipticCurve(new ECFieldFp(BigInteger
                .valueOf(23L)), BigInteger.ONE, BigInteger.valueOf(19L),
                new byte[24]);
        assertTrue(c1.equals(c3) && c3.equals(c1));


        // test case 5: equal objects
        c1 = new EllipticCurve(new ECFieldFp(BigInteger.valueOf(23L)),
                BigInteger.ONE, BigInteger.valueOf(19L));
        c2 = new EllipticCurve(new ECFieldFp(BigInteger.valueOf(23L)),
                BigInteger.valueOf(1L), BigInteger.valueOf(19L), null);
        assertTrue(c1.equals(c2) && c2.equals(c1));
    }

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     * Assertion: must return the same value if invoked
     * repeatedly on the same object. 
     */
    public final void testHashCode01() {
        int hc = 0;
        EllipticCurve f = new EllipticCurve(new ECFieldFp(BigInteger
                .valueOf(23L)), BigInteger.ONE, BigInteger.valueOf(19L),
                new byte[24]);
        hc = f.hashCode();
        assertTrue(hc == f.hashCode() && hc == f.hashCode()
                && hc == f.hashCode() && hc == f.hashCode()

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     *
     * Assertion: must return the same value if invoked
     * on equal (according to the <code>equals(Object)</code> method) objects. 
     */
    public final void testHashCode02() {
        assertEquals(new EllipticCurve(new ECFieldFp(BigInteger.valueOf(23L)),
                BigInteger.ONE, BigInteger.valueOf(19L), new byte[24])
                .hashCode(), new EllipticCurve(new ECFieldFp(BigInteger
                .valueOf(23L)), BigInteger.ONE, BigInteger.valueOf(19L),
                new byte[24]).hashCode());
    }

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        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,

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