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针对sm2和sm4两种加密算法的java实现

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package com.bouncycastle.math.ec;

/**
 * Class holding precomputation data for the WTNAF (Window
 * τ-adic Non-Adjacent Form) algorithm.
 */
class WTauNafPreCompInfo implements PreCompInfo
{
    /**
     * Array holding the precomputed ECPoint.F2ms used for the
     * WTNAF multiplication in 
     * {@link org.bouncycastle.math.ec.multiplier.WTauNafMultiplier.multiply()
     * WTauNafMultiplier.multiply()}.
     */
    private ECPoint.F2m[] preComp = null;

    /**
     * Constructor for WTauNafPreCompInfo
     * @param preComp Array holding the precomputed ECPoint.F2ms
     * used for the WTNAF multiplication in 
     * {@link org.bouncycastle.math.ec.multiplier.WTauNafMultiplier.multiply()
     * WTauNafMultiplier.multiply()}.
     */
    WTauNafPreCompInfo(ECPoint.F2m[] preComp)
    {
        this.preComp = preComp;
    }

    /**
     * @return the array holding the precomputed ECPoint.F2ms
     * used for the WTNAF multiplication in 
     * {@link org.bouncycastle.math.ec.multiplier.WTauNafMultiplier.multiply()
     * WTauNafMultiplier.multiply()}.
     */
    protected ECPoint.F2m[] getPreComp()
    {
        return preComp;
    }
}