76 lines
2.7 KiB
C#
76 lines
2.7 KiB
C#
using System;
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using System.Linq;
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class Program
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{
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const string Lower = "abcdefghijklmnopqrstuvwxyz";
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const string Upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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const string Digits = "0123456789";
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const string Symbols = "!\"#$%&'()*+,-./:;<=>?@[]^_{|}~";
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static readonly string[] Full = {Lower, Upper, Digits, Symbols, Lower + Upper + Digits + Symbols};
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const string Similar = "Il1O05S2Z";
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static readonly string[] Excluded = Full.Select(x => new string(x.Except(Similar).ToArray())).ToArray();
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static Random _rng = new Random();
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static string[] _symbolSet = Full;
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static void Main(string[] args)
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{
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int length = 12, count = 1;
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try
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{
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foreach (var x in args.Select(arg => arg.Split(':')))
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{
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switch (x[0])
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{
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case "-l": length = int.Parse(x[1]); break;
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case "-c": count = int.Parse(x[1]); break;
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case "-s": _rng = new Random(x[1].GetHashCode()); break;
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case "-x": _symbolSet = bool.Parse(x[1]) ? Excluded : Full; break;
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default: throw new FormatException("Could not parse arguments");
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}
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}
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}
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catch { ShowUsage(); return; }
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try
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{
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for (int i = 0; i < count; i++)
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Console.WriteLine(GeneratePass(length));
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}
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catch (Exception ex) { Console.WriteLine("Error: " + ex.Message); }
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}
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static void ShowUsage()
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{
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Console.WriteLine("Usage: PASSGEN [-l:length] [-c:count] [-s:seed] [-x:(true|false)]");
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Console.WriteLine("\t-l: the length of the generated passwords");
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Console.WriteLine("\t-c: the number of passwords to generate");
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Console.WriteLine("\t-s: seed for the random number generator");
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Console.WriteLine("\t-x: exclude similar characters: " + Similar);
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Console.WriteLine("Example: PASSGEN -l:10 -c:5 -s:\"Sample Seed\" -x:true");
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}
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static string GeneratePass(int length)
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{
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var minLength = _symbolSet.Length - 1;
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if(length < minLength)
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throw new Exception("password length must be " + minLength + " or greater");
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int[] usesRemaining = Enumerable.Repeat(1, _symbolSet.Length).ToArray();
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usesRemaining[minLength] = length - minLength;
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var password = new char[length];
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for (int ii = 0; ii < length; ii++)
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{
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int set = _rng.Next(0, _symbolSet.Length);
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if (usesRemaining[set] > 0)
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{
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usesRemaining[set]--;
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password[ii] = _symbolSet[set][_rng.Next(0, _symbolSet[set].Length)];
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}
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else ii--;
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}
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return new string(password);
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}
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}
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