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 to JDK 1.8.
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package org.bouncycastle.math.ec;


Class holding precomputation data for the WTNAF (Window
τ-adic Non-Adjacent Form) algorithm.

/**
 * Class holding precomputation data for the WTNAF (Window
 * <code>&tau;</code>-adic Non-Adjacent Form) algorithm.
 */
public class WTauNafPreCompInfo implements PreCompInfo
{
    
Array holding the precomputed ECPoint.AbstractF2ms used for the
WTNAF multiplication.

/**
     * Array holding the precomputed <code>ECPoint.AbstractF2m</code>s used for the
     * WTNAF multiplication.
     */
    protected ECPoint.AbstractF2m[] preComp = null;

    public ECPoint.AbstractF2m[] getPreComp()
    {
        return preComp;
    }

    public void setPreComp(ECPoint.AbstractF2m[] preComp)
    {
        this.preComp = preComp;
    }
}