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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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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);
}