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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 1.5 to JDK 1.7. Note: this package includes the IDEA and NTRU encryption algorithms.

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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);
}