45 lines
1.4 KiB
C#
45 lines
1.4 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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using System;
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using Org.BouncyCastle.Math.EC.Endo;
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namespace Org.BouncyCastle.Math.EC.Multiplier
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{
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public class GlvMultiplier
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: AbstractECMultiplier
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{
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protected readonly ECCurve curve;
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protected readonly GlvEndomorphism glvEndomorphism;
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public GlvMultiplier(ECCurve curve, GlvEndomorphism glvEndomorphism)
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{
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if (curve == null || curve.Order == null)
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throw new ArgumentException("Need curve with known group order", "curve");
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this.curve = curve;
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this.glvEndomorphism = glvEndomorphism;
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}
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protected override ECPoint MultiplyPositive(ECPoint p, BigInteger k)
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{
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if (!curve.Equals(p.Curve))
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throw new InvalidOperationException();
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BigInteger n = p.Curve.Order;
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BigInteger[] ab = glvEndomorphism.DecomposeScalar(k.Mod(n));
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BigInteger a = ab[0], b = ab[1];
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ECPointMap pointMap = glvEndomorphism.PointMap;
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if (glvEndomorphism.HasEfficientPointMap)
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{
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return ECAlgorithms.ImplShamirsTrickWNaf(p, a, pointMap, b);
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}
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return ECAlgorithms.ImplShamirsTrickWNaf(p, a, pointMap.Map(p), b);
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}
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}
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}
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#endif
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