DHKeyGeneratorHelper
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Math.EC.Multiplier;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Crypto.Generators
{
internal static class DHKeyGeneratorHelper
{
internal static BigInteger CalculatePrivate(DHParameters dhParams, SecureRandom random)
{
int l = dhParams.L;
if (l != 0) {
int num = l >> 2;
BigInteger bigInteger;
do {
bigInteger = new BigInteger(l, random).SetBit(l - 1);
} while (WNafUtilities.GetNafWeight(bigInteger) < num);
return bigInteger;
}
BigInteger min = BigInteger.Two;
int m = dhParams.M;
if (m != 0)
min = BigInteger.One.ShiftLeft(m - 1);
BigInteger bigInteger2 = (dhParams.Q ?? dhParams.P).Subtract(BigInteger.Two);
int num2 = bigInteger2.BitLength >> 2;
BigInteger bigInteger3;
do {
bigInteger3 = BigIntegers.CreateRandomInRange(min, bigInteger2, random);
} while (WNafUtilities.GetNafWeight(bigInteger3) < num2);
return bigInteger3;
}
internal static BigInteger CalculatePublic(DHParameters dhParams, BigInteger x)
{
return dhParams.G.ModPow(x, dhParams.P);
}
}
}