BruteforceGenerator+WordlistProcessor.cs

using System;
using System.IO;
using System.Collections.Generic;

public class BruteforceGenerator{
    public char[] CharSet{ get; private set; }
    public int Length{ get; private set; }
    public short[] State{ get; private set; }
    public string Current{ get; private set; }

    public BruteforceGenerator(char[] CharSet, int Length, short[] State){
        this.CharSet = CharSet;
        this.Length = Length;
        this.State = State;
        this.Current = "";
    }

    public BruteforceGenerator(char[] CharSet, int Length){
        this.CharSet = CharSet;
        this.Length = Length;
        this.State = new short[Length];
        this.State[Length - 1] = -1;
        this.Current = "";
    }

    public string Next(){
        if(Current == null) return null;
        this.State[Length - 1]++;
        for(int i = Length - 1; i >= 0; i--){
            if(State[i] == CharSet.Length){
                State[i] = 0;
                if(i > 0) State[i - 1]++;
                else{
                    Current = null;
                    return null;
                }
            }
        }
        Current = "";
        for(int i = 0; i < Length; i++)
            Current += CharSet[State[i]];
        return Current;
    }
}

public class WordlistProcessor{
    public string Filename{ get; private set; }
    private TextReader WordlistReader;
    public string Current{ get; private set; }
    private Stack<string> Mutations;

    public WordlistProcessor(string Filename){
        this.Current = "";
        this.Mutations = new Stack<string>();
        this.Filename = Filename;
        this.WordlistReader = new StreamReader(new FileStream(Filename, FileMode.Open, FileAccess.Read, FileShare.Read));
    }

    private void ReadNext(){
        String Line = WordlistReader.ReadLine();
        Mutations.Clear();
        if(Line == null) return;
        string Mutation;
        for(int i = 0; i < Math.Pow(2, Line.Length); i++){
            Mutation = "";
            for(int j = 0; j < Line.Length; j++){
                char c = Line[j];
                if((i & (1 << j)) != 0) Mutation += (c >= 'a' && c <= 'z') ? (char)(c ^ 32) : c;
                else Mutation += (c >= 'A' && c <= 'Z') ? (char)(c ^ 32) : c;
            }
            Mutations.Push(Mutation);
        }
    }

    public string Next(){
        if(Current == null) return null;
        if(Mutations.Count > 0){
            Current = Mutations.Pop();
        }
        else{
            ReadNext();
            if(Mutations.Count <= 0) Current = null;
            else Current = Mutations.Pop();
        }
        return Current;
    }

    public void Close(){
        WordlistReader.Close();
    }
}