Examples with ECFieldFp java.security.spec.ECFieldFp used on opensource projects

Example 16 with ECFieldFp

use of java.security.spec.ECFieldFp in project j2objc by google.

the class EllipticCurveTest method testEllipticCurveECFieldBigIntegerBigIntegerbyteArray02.

/**
     * Test #2 for <code>EllipticCurve(ECField, BigInteger, BigInteger, byte[])</code>
     * constructor<br>
     * Assertion: throws <code>NullPointerException</code> if <code>field</code>,
     * <code>a</code> or <code>b</code> is <code>null</code><br>
     * Test preconditions: pass <code>null</code> as mentioned parameters<br>
     * Expected: must throw <code>NullPointerException</code>
     */
public final void testEllipticCurveECFieldBigIntegerBigIntegerbyteArray02() {
    // test case 1 parameters set
    ECFieldFp f = null;
    BigInteger a = BigInteger.ONE;
    BigInteger b = BigInteger.valueOf(19L);
    byte[] seed = new byte[24];
    // perform test case 1
    try {
        new EllipticCurve(f, a, b, seed);
        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);
    seed = new byte[24];
    // perform test case 2
    try {
        new EllipticCurve(f, a, b, seed);
        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;
    seed = new byte[24];
    // perform test case 2
    try {
        new EllipticCurve(f, a, b, seed);
        fail("#3: Expected NPE not thrown");
    } catch (NullPointerException ok) {
    }
}

Example 17 with ECFieldFp

use of java.security.spec.ECFieldFp in project j2objc by google.

the class ECFieldFpTest method testHashCode01.

/**
     * Test #1 for <code>hashCode()</code> method.<br>
     *
     * Assertion: must return the same value if invoked
     * repeatedly on the same object.
     */
public final void testHashCode01() {
    ECFieldFp f = new ECFieldFp(BigInteger.valueOf(23L));
    int hc = f.hashCode();
    assertTrue(hc == f.hashCode() && hc == f.hashCode() && hc == f.hashCode() && hc == f.hashCode() && hc == f.hashCode() && hc == f.hashCode() && hc == f.hashCode() && hc == f.hashCode());
}

Example 18 with ECFieldFp

use of java.security.spec.ECFieldFp in project j2objc by google.

the class ECFieldFpTest method testGetP.

/**
     * Test for <code>getP()</code> method.<br>
     *
     * Assertion: returns prime
     */
public final void testGetP() {
    BigInteger p = BigInteger.valueOf(23L);
    assertTrue(p.equals(new ECFieldFp(p).getP()));
}

Example 19 with ECFieldFp

use of java.security.spec.ECFieldFp in project wycheproof by google.

the class EcUtil method getPoint.

/**
   * Decompress a point
   *
   * @param x The x-coordinate of the point
   * @param bit0 true if the least significant bit of y is set.
   * @param ecParams contains the curve of the point. This must be over a prime order field.
   */
public static ECPoint getPoint(BigInteger x, boolean bit0, ECParameterSpec ecParams) throws GeneralSecurityException {
    EllipticCurve ec = ecParams.getCurve();
    ECField field = ec.getField();
    if (!(field instanceof ECFieldFp)) {
        throw new GeneralSecurityException("Only curves over prime order fields are supported");
    }
    BigInteger p = ((java.security.spec.ECFieldFp) field).getP();
    if (x.compareTo(BigInteger.ZERO) == -1 || x.compareTo(p) != -1) {
        throw new GeneralSecurityException("x is out of range");
    }
    // Compute rhs == x^3 + a x + b (mod p)
    BigInteger rhs = x.multiply(x).add(ec.getA()).multiply(x).add(ec.getB()).mod(p);
    BigInteger y = modSqrt(rhs, p);
    if (bit0 != y.testBit(0)) {
        y = p.subtract(y).mod(p);
    }
    return new ECPoint(x, y);
}

Example 20 with ECFieldFp

use of java.security.spec.ECFieldFp in project XobotOS by xamarin.

the class EC5Util method convertCurve.

public static EllipticCurve convertCurve(ECCurve curve, byte[] seed) {
    // so at the moment it's set to null. Should probably look at making this configurable
    if (curve instanceof ECCurve.Fp) {
        return new EllipticCurve(new ECFieldFp(((ECCurve.Fp) curve).getQ()), curve.getA().toBigInteger(), curve.getB().toBigInteger(), null);
    } else {
        ECCurve.F2m curveF2m = (ECCurve.F2m) curve;
        int[] ks;
        if (curveF2m.isTrinomial()) {
            ks = new int[] { curveF2m.getK1() };
            return new EllipticCurve(new ECFieldF2m(curveF2m.getM(), ks), curve.getA().toBigInteger(), curve.getB().toBigInteger(), null);
        } else {
            ks = new int[] { curveF2m.getK3(), curveF2m.getK2(), curveF2m.getK1() };
            return new EllipticCurve(new ECFieldF2m(curveF2m.getM(), ks), curve.getA().toBigInteger(), curve.getB().toBigInteger(), null);
        }
    }
}