sharp-chat/SharpChat/RNG.cs

using System;
using System.Security.Cryptography;

namespace SharpChat {
    public static class RNG {
        private static object Lock { get; } = new();
        private static Random NormalRandom { get; } = new();
        private static RandomNumberGenerator SecureRandom { get; } = RandomNumberGenerator.Create();

        public static int Next() {
            lock(Lock)
                return NormalRandom.Next();
        }

        public static int Next(int max) {
            lock(Lock)
                return NormalRandom.Next(max);
        }

        public static int Next(int min, int max) {
            lock(Lock)
                return NormalRandom.Next(min, max);
        }

        public static void NextBytes(byte[] buffer) {
            lock(Lock)
                SecureRandom.GetBytes(buffer);
        }
    }
}