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34 lines
860 B
34 lines
860 B
2 months ago
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using System;
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namespace Org.BouncyCastle.Math.EC.Multiplier
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{
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/**
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* Class implementing the NAF (Non-Adjacent Form) multiplication algorithm (left-to-right).
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*/
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[Obsolete("Will be removed")]
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public class NafL2RMultiplier
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: AbstractECMultiplier
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{
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protected override ECPoint MultiplyPositive(ECPoint p, BigInteger k)
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{
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int[] naf = WNafUtilities.GenerateCompactNaf(k);
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ECPoint addP = p.Normalize(), subP = addP.Negate();
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ECPoint R = p.Curve.Infinity;
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int i = naf.Length;
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while (--i >= 0)
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{
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int ni = naf[i];
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int digit = ni >> 16, zeroes = ni & 0xFFFF;
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R = R.TwicePlus(digit < 0 ? subP : addP);
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R = R.TimesPow2(zeroes);
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}
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return R;
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}
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}
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}
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