org.bouncycastle.math.ec.ZSignedDigitR2LMultiplier Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of org.apache.servicemix.bundles.bcprov-jdk15on

This OSGi bundle wraps ${pkgArtifactId} ${pkgVersion} jar file.

There is a newer version: 1.70_1

Show newest version

package org.bouncycastle.math.ec;

import java.math.BigInteger;

/**
 * @deprecated Will be removed
 */
public class ZSignedDigitR2LMultiplier extends AbstractECMultiplier
{
    /**
     * 'Zeroless' Signed Digit Right-to-Left.
     */
    protected ECPoint multiplyPositive(ECPoint p, BigInteger k)
    {
        ECPoint R0 = p.getCurve().getInfinity(), R1 = p;

        int n = k.bitLength();
        int s = k.getLowestSetBit();

        R1 = R1.timesPow2(s);

        int i = s;
        while (++i < n)
        {
            R0 = R0.add(k.testBit(i) ? R1 : R1.negate());
            R1 = R1.twice();
        }

        R0 = R0.add(R1);

        return R0;
    }
}