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32 lines
733 B
32 lines
733 B
using System;
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namespace Org.BouncyCastle.Math.EC.Multiplier
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{
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[Obsolete("Will be removed")]
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public class ZSignedDigitL2RMultiplier
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: AbstractECMultiplier
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{
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/**
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* 'Zeroless' Signed Digit Left-to-Right.
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*/
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protected override ECPoint MultiplyPositive(ECPoint p, BigInteger k)
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{
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ECPoint addP = p.Normalize(), subP = addP.Negate();
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ECPoint R0 = addP;
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int n = k.BitLength;
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int s = k.GetLowestSetBit();
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int i = n;
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while (--i > s)
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{
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R0 = R0.TwicePlus(k.TestBit(i) ? addP : subP);
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}
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R0 = R0.TimesPow2(s);
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return R0;
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}
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}
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}
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