1 using System;
 2 using System.IO;
 3 using System.Text;
 4 using System.Security.Cryptography;
 5
 6 class RNGCSP
 7 {
 8     public static void Main()
 9     {
10         for(int x = 0; x <= 30; x++)
11             Console.WriteLine(RollDice(6));
12     }
13
14     public static int RollDice(int NumSides)
15     {
16         byte[] randomNumber = new byte[1];
17
18         RNGCryptoServiceProvider Gen = new RNGCryptoServiceProvider();
19
20         Gen.GetBytes(randomNumber);
21
22         int rand = Convert.ToInt32(randomNumber[0]);
23
24         return rand % NumSides + 1;
25     }
26 }

  1 public sealed class CryptoRandomSource : RandomSource, IDisposable
  2 {
  3     const double Reciprocal = 1.0/uint.MaxValue;
  4     readonly RandomNumberGenerator _crypto;
  5
  6     /// <summary>
  7     /// Construct a new random number generator with a random seed.
  8     /// </summary>
  9     /// <remarks>Uses <see cref="System.Security.Cryptography.RNGCryptoServiceProvider"/> and uses the value of
 10     /// <see cref="Control.ThreadSafeRandomNumberGenerators"/> to set whether the instance is thread safe.</remarks>
 11     public CryptoRandomSource()
 12     {
 13         _crypto = new RNGCryptoServiceProvider();
 14     }
 15
 16     /// <summary>
 17     /// Construct a new random number generator with random seed.
 18     /// </summary>
 19     /// <param name="rng">The <see cref="RandomNumberGenerator"/> to use.</param>
 20     /// <remarks>Uses the value of  <see cref="Control.ThreadSafeRandomNumberGenerators"/> to set whether the instance is thread safe.</remarks>
 21     public CryptoRandomSource(RandomNumberGenerator rng)
 22     {
 23         _crypto = rng;
 24     }
 25
 26     /// <summary>
 27     /// Construct a new random number generator with random seed.
 28     /// </summary>
 29     /// <remarks>Uses <see cref="System.Security.Cryptography.RNGCryptoServiceProvider"/></remarks>
 30     /// <param name="threadSafe">if set to <c>true</c> , the class is thread safe.</param>
 31     public CryptoRandomSource(bool threadSafe) : base(threadSafe)
 32     {
 33         _crypto = new RNGCryptoServiceProvider();
 34     }
 35
 36     /// <summary>
 37     /// Construct a new random number generator with random seed.
 38     /// </summary>
 39     /// <param name="rng">The <see cref="RandomNumberGenerator"/> to use.</param>
 40     /// <param name="threadSafe">if set to <c>true</c> , the class is thread safe.</param>
 41     public CryptoRandomSource(RandomNumberGenerator rng, bool threadSafe) : base(threadSafe)
 42     {
 43         _crypto = rng;
 44     }
 45
 46     /// <summary>
 47     /// Returns a random number between 0.0 and 1.0.
 48     /// </summary>
 49     /// <returns>
 50     /// A double-precision floating point number greater than or equal to 0.0, and less than 1.0.
 51     /// </returns>
 52     protected override sealed double DoSample()
 53     {
 54         var bytes = new byte[4];
 55         _crypto.GetBytes(bytes);
 56         return BitConverter.ToUInt32(bytes, 0)*Reciprocal;
 57     }
 58
 59     public void Dispose()
 60     {
 61 #if !NET35
 62         _crypto.Dispose();
 63 #endif
 64     }
 65
 66     /// <summary>
 67     /// Fills an array with random numbers greater than or equal to 0.0 and less than 1.0.
 68     /// </summary>
 69     /// <remarks>Supports being called in parallel from multiple threads.</remarks>
 70     public static void Doubles(double[] values)
 71     {
 72         var bytes = new byte[values.Length*4];
 73
 74 #if !NET35
 75         using (var rnd = new RNGCryptoServiceProvider())
 76         {
 77             rnd.GetBytes(bytes);
 78         }
 79 #else
 80         var rnd = new RNGCryptoServiceProvider();
 81         rnd.GetBytes(bytes);
 82 #endif
 83
 84         for (int i = 0; i < values.Length; i++)
 85         {
 86             values[i] = BitConverter.ToUInt32(bytes, i*4)*Reciprocal;
 87         }
 88     }
 89
 90     /// <summary>
 91     /// Returns an array of random numbers greater than or equal to 0.0 and less than 1.0.
 92     /// </summary>
 93     /// <remarks>Supports being called in parallel from multiple threads.</remarks>
 94     [TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
 95     public static double[] Doubles(int length)
 96     {
 97         var data = new double[length];
 98         Doubles(data);
 99         return data;
100     }
101
102     /// <summary>
103     /// Returns an infinite sequence of random numbers greater than or equal to 0.0 and less than 1.0.
104     /// </summary>
105     /// <remarks>Supports being called in parallel from multiple threads.</remarks>
106     public static IEnumerable<double> DoubleSequence()
107     {
108         var rnd = new RNGCryptoServiceProvider();
109         var buffer = new byte[1024*4];
110
111         while (true)
112         {
113             rnd.GetBytes(buffer);
114             for (int i = 0; i < buffer.Length; i += 4)
115             {
116                 yield return BitConverter.ToUInt32(buffer, i)*Reciprocal;
117             }
118         }
119     }
120 }