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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.

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package org.bouncycastle.math.ec;

import java.math.BigInteger;

/**
 * Interface for classes encapsulating a point multiplication algorithm
 * for  ECPoints.
 */
public interface ECMultiplier
{
    /**
     * Multiplies the  ECPoint p by  k, i.e.
     *  p is added  k times to itself.
     * @param p The  ECPoint to be multiplied.
     * @param k The factor by which  p is multiplied.
     * @return  p multiplied by  k.
     */
    ECPoint multiply(ECPoint p, BigInteger k);
}