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); }