/// <summary>
/// Returns a shuffled IEnumerable.
/// </summary>
/// <typeparam name="T">The type of object being enumerated</typeparam>
/// <param name="rand">An instance of a random number generator</param>
/// <returns>A shuffled shallow copy of the source items</returns>
public static IEnumerable <T> Shuffle <T>(this IEnumerable <T> source, CryptoRandomGenerator rand)
{
var list = source.ToList();
list.Shuffle(rand);
return(list);
}
/// <summary>
/// Returns a random element from a list, or null if the list is empty.
/// </summary>
/// <typeparam name="T">The type of object being enumerated</typeparam>
/// <param name="rand">An instance of a random number generator</param>
/// <returns>A random element from a list, or null if the list is empty</returns>
public static T Random <T>(this IEnumerable <T> list, CryptoRandomGenerator rand)
{
if (list != null && list.Count() > 0)
{
return(list.ElementAt(rand.Next(list.Count())));
}
return(default(T));
}
/// <summary>
/// Shuffles an IList in place.
/// </summary>
/// <typeparam name="T">The type of elements in the list</typeparam>
/// <param name="rand">An instance of a random number generator</param>
public static void Shuffle <T>(this IList <T> list, CryptoRandomGenerator rand)
{
int count = list.Count;
while (count > 1)
{
int i = rand.Next(count--);
T temp = list[count];
list[count] = list[i];
list[i] = temp;
}
}
public void Test()
{
//var lemerRandomGenerator = new GPSSRandomGenerator(3729);
////var lemerRandomGenerator = new SequenceMethodRandomGenerator(100011);
//var lemerRandomGenerator = new LemerRandomGenerator(100011);
var lemerRandomGenerator = new CryptoRandomGenerator();
//var uniformTest = new PokerTest(0, 9, 100);
var uniformTest = new IntervalTest(0, 10, 10000, 500);
for (var i = 0; i < 5; i++)
{
Console.WriteLine(uniformTest.Check(lemerRandomGenerator));
}
}
public static string NewSecurePassword()
{
var UpperCharsSet = Enumerable.Range(65, 26).Select(i => (byte)i).ToArray(); // A..Z
var LowerCharsSet = Enumerable.Range(97, 26).Select(i => (byte)i).ToArray(); // a..z
var NumbersSet = Enumerable.Range(48, 10).Select(i => (byte)i).ToArray(); // 0..9
var SpecialCharsSet = new byte[] { 33, 35, 40, 41, 64 }; // !, #, (, ), @
var All = UpperCharsSet.Concat(LowerCharsSet).Concat(NumbersSet).Concat(SpecialCharsSet).ToArray();
using (var r = new CryptoRandomGenerator())
{
int length = r.Next(32, 41);
var u = Enumerable.Range(0, 5).Select(i => UpperCharsSet[r.Next(0, UpperCharsSet.Length)]);
var l = Enumerable.Range(0, 1).Select(i => LowerCharsSet[r.Next(0, LowerCharsSet.Length)]);
var n = Enumerable.Range(0, 1).Select(i => NumbersSet[r.Next(0, NumbersSet.Length)]);
var s = Enumerable.Range(0, 4).Select(i => SpecialCharsSet[r.Next(0, SpecialCharsSet.Length)]);
var a = Enumerable.Range(0, length - 11).Select(i => All[r.Next(0, All.Length)]);
return(Encoding.ASCII.GetString(u.Concat(l).Concat(n).Concat(s).Concat(a).Shuffle().ToArray()));
}
}
