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 WNAF (Window Non-Adjacent Form)
algorithm.

/**
 * Class holding precomputation data for the WNAF (Window Non-Adjacent Form)
 * algorithm.
 */
public class WNafPreCompInfo implements PreCompInfo
{
    
Array holding the precomputed ECPoints used for a Window
NAF multiplication.

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

    
Array holding the negations of the precomputed ECPoints used
for a Window NAF multiplication.

/**
     * Array holding the negations of the precomputed <code>ECPoint</code>s used
     * for a Window NAF multiplication.
     */
    protected ECPoint[] preCompNeg = null;

    
Holds an ECPoint representing twice(this). Used for the
Window NAF multiplication to create or extend the precomputed values.

/**
     * Holds an <code>ECPoint</code> representing twice(this). Used for the
     * Window NAF multiplication to create or extend the precomputed values.
     */
    protected ECPoint twice = null;

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

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

    public ECPoint[] getPreCompNeg()
    {
        return preCompNeg;
    }

    public void setPreCompNeg(ECPoint[] preCompNeg)
    {
        this.preCompNeg = preCompNeg;
    }

    public ECPoint getTwice()
    {
        return twice;
    }

    public void setTwice(ECPoint twice)
    {
        this.twice = twice;
    }
}