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

Example 21 with ECFieldFp

use of java.security.spec.ECFieldFp in project robovm by robovm.

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 22 with ECFieldFp

use of java.security.spec.ECFieldFp in project cxf by apache.

the class JweUtils method getECDHKey.

public static byte[] getECDHKey(ECPrivateKey privateKey, ECPublicKey peerPublicKey, byte[] partyUInfo, byte[] partyVInfo, String algoName, int algoKeyBitLen) {
    // Step 1: Verify public key is not point at infinity.
    if (ECPoint.POINT_INFINITY.equals(peerPublicKey.getW())) {
        throw new JweException(JweException.Error.KEY_ENCRYPTION_FAILURE);
    }
    EllipticCurve curve = peerPublicKey.getParams().getCurve();
    final BigInteger x = peerPublicKey.getW().getAffineX();
    final BigInteger y = peerPublicKey.getW().getAffineY();
    final BigInteger p = ((ECFieldFp) curve.getField()).getP();
    // Step 2: Verify x and y are in range [0,p-1]
    if (x.compareTo(BigInteger.ZERO) < 0 || x.compareTo(p) >= 0 || y.compareTo(BigInteger.ZERO) < 0 || y.compareTo(p) >= 0) {
        throw new JweException(JweException.Error.KEY_ENCRYPTION_FAILURE);
    }
    final BigInteger a = curve.getA();
    final BigInteger b = curve.getB();
    // Step 3: Verify that y^2 == x^3 + ax + b (mod p)
    final BigInteger ySquared = y.modPow(BigInteger.valueOf(2), p);
    final BigInteger xCubedPlusAXPlusB = x.modPow(BigInteger.valueOf(3), p).add(a.multiply(x)).add(b).mod(p);
    if (!ySquared.equals(xCubedPlusAXPlusB)) {
        throw new JweException(JweException.Error.KEY_ENCRYPTION_FAILURE);
    }
    // All the NIST curves used here define h = 1.
    if (peerPublicKey.getParams().getCofactor() != 1) {
        throw new JweException(JweException.Error.KEY_ENCRYPTION_FAILURE);
    }
    // Finally calculate the derived key
    byte[] keyZ = generateKeyZ(privateKey, peerPublicKey);
    return calculateDerivedKey(keyZ, algoName, partyUInfo, partyVInfo, algoKeyBitLen);
}

Example 23 with ECFieldFp

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

the class EcUtil method getBrainpoolP256r1Params.

public static ECParameterSpec getBrainpoolP256r1Params() {
    BigInteger p = new BigInteger("A9FB57DBA1EEA9BC3E660A909D838D726E3BF623D52620282013481D1F6E5377", 16);
    BigInteger a = new BigInteger("7D5A0975FC2C3057EEF67530417AFFE7FB8055C126DC5C6CE94A4B44F330B5D9", 16);
    BigInteger b = new BigInteger("26DC5C6CE94A4B44F330B5D9BBD77CBF958416295CF7E1CE6BCCDC18FF8C07B6", 16);
    BigInteger x = new BigInteger("8BD2AEB9CB7E57CB2C4B482FFC81B7AFB9DE27E1E3BD23C23A4453BD9ACE3262", 16);
    BigInteger y = new BigInteger("547EF835C3DAC4FD97F8461A14611DC9C27745132DED8E545C1D54C72F046997", 16);
    BigInteger n = new BigInteger("A9FB57DBA1EEA9BC3E660A909D838D718C397AA3B561A6F7901E0E82974856A7", 16);
    final int h = 1;
    ECFieldFp fp = new ECFieldFp(p);
    EllipticCurve curve = new EllipticCurve(fp, a, b);
    ECPoint g = new ECPoint(x, y);
    return new ECParameterSpec(curve, g, n, h);
}

Example 24 with ECFieldFp

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

the class EcUtil method decompressPoint.

/**
   * Decompress a point on an elliptic curve.
   *
   * @param bytes The compressed point. Its representation is z || x where z is 2+lsb(y) and x is
   *     using a unsigned fixed length big-endian representation.
   * @param ecParams the specification of the curve. Only Weierstrass curves over prime order fields
   *     are implemented.
   */
public static ECPoint decompressPoint(byte[] bytes, 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();
    int expectedLength = 1 + (p.bitLength() + 7) / 8;
    if (bytes.length != expectedLength) {
        throw new GeneralSecurityException("compressed point has wrong length");
    }
    boolean lsb;
    switch(bytes[0]) {
        case 2:
            lsb = false;
            break;
        case 3:
            lsb = true;
            break;
        default:
            throw new GeneralSecurityException("Invalid format");
    }
    BigInteger x = new BigInteger(1, Arrays.copyOfRange(bytes, 1, bytes.length));
    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 (lsb != y.testBit(0)) {
        y = p.subtract(y).mod(p);
    }
    return new ECPoint(x, y);
}

Example 25 with ECFieldFp

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

the class EcUtil method getNistCurveSpec.

public static ECParameterSpec getNistCurveSpec(String decimalP, String decimalN, String hexB, String hexGX, String hexGY) {
    final BigInteger p = new BigInteger(decimalP);
    final BigInteger n = new BigInteger(decimalN);
    final BigInteger three = new BigInteger("3");
    final BigInteger a = p.subtract(three);
    final BigInteger b = new BigInteger(hexB, 16);
    final BigInteger gx = new BigInteger(hexGX, 16);
    final BigInteger gy = new BigInteger(hexGY, 16);
    final int h = 1;
    ECFieldFp fp = new ECFieldFp(p);
    java.security.spec.EllipticCurve curveSpec = new java.security.spec.EllipticCurve(fp, a, b);
    ECPoint g = new ECPoint(gx, gy);
    ECParameterSpec ecSpec = new ECParameterSpec(curveSpec, g, n, h);
    return ecSpec;
}