http://www.bouncycastle.org/java.html: 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. 
package org.bouncycastle.math.ec;

import java.math.BigInteger;


Interface for classes encapsulating a point multiplication algorithm
for ECPoints.

/**
 * Interface for classes encapsulating a point multiplication algorithm
 * for <code>ECPoint</code>s.
 */
interface ECMultiplier
{
    
Multiplies the ECPoint p by k, i.e.
p is added k times to itself.

Params:
  • p – The ECPoint to be multiplied.
  • k – The factor by which p i multiplied.
Returns:p multiplied by k.
/**
     * Multiplies the <code>ECPoint p</code> by <code>k</code>, i.e.
     * <code>p</code> is added <code>k</code> times to itself.
     * @param p The <code>ECPoint</code> to be multiplied.
     * @param k The factor by which <code>p</code> i multiplied.
     * @return <code>p</code> multiplied by <code>k</code>.
     */
    ECPoint multiply(ECPoint p, BigInteger k, PreCompInfo preCompInfo);
}