public static BigInteger CreateRandomInRange(BigInteger min, BigInteger max, SecureRandom random)
{
int num = min.CompareTo(max);
if (num >= 0)
{
if (num > 0)
{
throw new ArgumentException("'min' may not be greater than 'max'");
}
return min;
}
if (min.BitLength > (max.BitLength / 2))
{
return CreateRandomInRange(BigInteger.Zero, max.Subtract(min), random).Add(min);
}
for (int i = 0; i < 0x3e8; i++)
{
BigInteger integer = new BigInteger(max.BitLength, random);
if ((integer.CompareTo(min) >= 0) && (integer.CompareTo(max) <= 0))
{
return integer;
}
}
return new BigInteger(max.Subtract(min).BitLength - 1, random).Add(min);
}
public virtual void Init(BigInteger N, BigInteger g, IDigest digest, SecureRandom random)
{
this.N = N;
this.g = g;
this.digest = digest;
this.random = random;
}
public static BigInteger GeneratePrivateValue(IDigest digest, BigInteger N, BigInteger g, SecureRandom random)
{
int num = Math.Min(0x100, N.BitLength / 2);
BigInteger min = BigInteger.One.ShiftLeft(num - 1);
BigInteger max = N.Subtract(BigInteger.One);
return BigIntegers.CreateRandomInRange(min, max, random);
}
