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33 lines
750 B
33 lines
750 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 ZSignedDigitR2LMultiplier
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: AbstractECMultiplier
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{
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/**
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* 'Zeroless' Signed Digit Right-to-Left.
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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 R0 = p.Curve.Infinity, R1 = p;
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int n = k.BitLength;
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int s = k.GetLowestSetBit();
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R1 = R1.TimesPow2(s);
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int i = s;
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while (++i < n)
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{
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R0 = R0.Add(k.TestBit(i) ? R1 : R1.Negate());
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R1 = R1.Twice();
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}
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R0 = R0.Add(R1);
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return R0;
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}
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}
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}
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