77 lines
2.0 KiB
C#
77 lines
2.0 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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using System;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Math;
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using Org.BouncyCastle.Math.EC.Multiplier;
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using Org.BouncyCastle.Security;
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using Org.BouncyCastle.Utilities;
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namespace Org.BouncyCastle.Crypto.Generators
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{
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class DHKeyGeneratorHelper
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{
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internal static readonly DHKeyGeneratorHelper Instance = new DHKeyGeneratorHelper();
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private DHKeyGeneratorHelper()
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{
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}
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internal BigInteger CalculatePrivate(
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DHParameters dhParams,
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SecureRandom random)
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{
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int limit = dhParams.L;
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if (limit != 0)
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{
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int minWeight = limit >> 2;
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for (;;)
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{
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BigInteger x = new BigInteger(limit, random).SetBit(limit - 1);
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if (WNafUtilities.GetNafWeight(x) >= minWeight)
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{
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return x;
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}
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}
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}
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BigInteger min = BigInteger.Two;
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int m = dhParams.M;
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if (m != 0)
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{
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min = BigInteger.One.ShiftLeft(m - 1);
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}
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BigInteger q = dhParams.Q;
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if (q == null)
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{
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q = dhParams.P;
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}
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BigInteger max = q.Subtract(BigInteger.Two);
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{
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int minWeight = max.BitLength >> 2;
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for (;;)
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{
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BigInteger x = BigIntegers.CreateRandomInRange(min, max, random);
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if (WNafUtilities.GetNafWeight(x) >= minWeight)
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{
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return x;
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}
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}
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}
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}
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internal BigInteger CalculatePublic(
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DHParameters dhParams,
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BigInteger x)
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{
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return dhParams.G.ModPow(x, dhParams.P);
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}
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}
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}
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#endif
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