Examples with NativeBigInteger net.i2p.util.NativeBigInteger used on opensource projects

Example 1 with NativeBigInteger

use of net.i2p.util.NativeBigInteger in project i2p.i2p by i2p.

the class ECUtil method addPoint.

private static ECPoint addPoint(ECPoint r, ECPoint s, EllipticCurve curve) {
    if (r.equals(s))
        return doublePoint(r, curve);
    else if (r.equals(ECPoint.POINT_INFINITY))
        return s;
    else if (s.equals(ECPoint.POINT_INFINITY))
        return r;
    BigInteger prime = ((ECFieldFp) curve.getField()).getP();
    // use NBI modInverse();
    BigInteger tmp = r.getAffineX().subtract(s.getAffineX());
    tmp = new NativeBigInteger(tmp);
    BigInteger slope = (r.getAffineY().subtract(s.getAffineY())).multiply(tmp.modInverse(prime)).mod(prime);
    slope = new NativeBigInteger(slope);
    BigInteger xOut = (slope.modPow(TWO, prime).subtract(r.getAffineX())).subtract(s.getAffineX()).mod(prime);
    BigInteger yOut = s.getAffineY().negate().mod(prime);
    yOut = yOut.add(slope.multiply(s.getAffineX().subtract(xOut))).mod(prime);
    ECPoint out = new ECPoint(xOut, yOut);
    return out;
}

Example 2 with NativeBigInteger

use of net.i2p.util.NativeBigInteger in project i2p.i2p by i2p.

the class ECUtil method doublePoint.

private static ECPoint doublePoint(ECPoint r, EllipticCurve curve) {
    if (r.equals(ECPoint.POINT_INFINITY))
        return r;
    BigInteger slope = (r.getAffineX().pow(2)).multiply(THREE);
    slope = slope.add(curve.getA());
    BigInteger prime = ((ECFieldFp) curve.getField()).getP();
    // use NBI modInverse();
    BigInteger tmp = r.getAffineY().multiply(TWO);
    tmp = new NativeBigInteger(tmp);
    slope = slope.multiply(tmp.modInverse(prime));
    BigInteger xOut = slope.pow(2).subtract(r.getAffineX().multiply(TWO)).mod(prime);
    BigInteger yOut = (r.getAffineY().negate()).add(slope.multiply(r.getAffineX().subtract(xOut))).mod(prime);
    ECPoint out = new ECPoint(xOut, yOut);
    return out;
}

Example 3 with NativeBigInteger

use of net.i2p.util.NativeBigInteger in project i2p.i2p by i2p.

the class KeyGenerator method generatePKIKeys.

/**
 *  Same as above but different return type
 *  @since 0.8.7
 */
public SimpleDataStructure[] generatePKIKeys() {
    BigInteger a = new NativeBigInteger(getElGamalExponentSize(), _context.random());
    BigInteger aalpha = CryptoConstants.elgg.modPow(a, CryptoConstants.elgp);
    SimpleDataStructure[] keys = new SimpleDataStructure[2];
    keys[0] = new PublicKey();
    keys[1] = new PrivateKey();
    try {
        keys[0].setData(SigUtil.rectify(aalpha, PublicKey.KEYSIZE_BYTES));
        keys[1].setData(SigUtil.rectify(a, PrivateKey.KEYSIZE_BYTES));
    } catch (InvalidKeyException ike) {
        throw new IllegalArgumentException(ike);
    }
    return keys;
}

Example 4 with NativeBigInteger

use of net.i2p.util.NativeBigInteger in project i2p.i2p by i2p.

the class KeyGenerator method generateSigningKeys.

/**
 *  DSA-SHA1 only.
 *
 *  Same as above but different return type
 *  @since 0.8.7
 */
public SimpleDataStructure[] generateSigningKeys() {
    SimpleDataStructure[] keys = new SimpleDataStructure[2];
    BigInteger x = null;
    // make sure the random key is less than the DSA q and greater than zero
    do {
        x = new NativeBigInteger(160, _context.random());
    } while (x.compareTo(CryptoConstants.dsaq) >= 0 || x.equals(BigInteger.ZERO));
    BigInteger y = CryptoConstants.dsag.modPow(x, CryptoConstants.dsap);
    keys[0] = new SigningPublicKey();
    keys[1] = new SigningPrivateKey();
    try {
        keys[0].setData(SigUtil.rectify(y, SigningPublicKey.KEYSIZE_BYTES));
        keys[1].setData(SigUtil.rectify(x, SigningPrivateKey.KEYSIZE_BYTES));
    } catch (InvalidKeyException ike) {
        throw new IllegalStateException(ike);
    }
    return keys;
}

Example 5 with NativeBigInteger

use of net.i2p.util.NativeBigInteger in project i2p.i2p by i2p.

the class SigUtil method toJavaRSAKey.

/**
 *  @deprecated unused
 */
public static RSAPublicKey toJavaRSAKey(SigningPublicKey pk) throws GeneralSecurityException {
    SigType type = pk.getType();
    KeyFactory kf = KeyFactory.getInstance("RSA");
    BigInteger n = new NativeBigInteger(1, pk.getData());
    BigInteger e = ((RSAKeyGenParameterSpec) type.getParams()).getPublicExponent();
    // modulus exponent
    KeySpec ks = new RSAPublicKeySpec(n, e);
    return (RSAPublicKey) kf.generatePublic(ks);
}