#include <stdio.h>
#include <stdlib.h>
#include <time.h>

void very_easy_password(int);
void very_easy2_password(int);
void easy_password(int);
void medium_password(int);
void hard_password(int);
void hard2_password(int);
void very_hard_password(int);
void extreme_password(int);

int main(void)
{
  printf("PWgen.exe, password generator, Copyright (C) 2004 Scorpius");
  printf("\n\nPWgen.exe is free software; you can redistribute it and/or modify");
  printf("\nit under the terms of the GNU General Public License as published by");
  printf("\nthe Free Software Foundation; either version 2 of the License.");
  printf("\n\nPWgen.exe is distributed in the hope that it will be useful,");
  printf("\nbut WITHOUT ANY WARRANTY; without even the implied warranty of");
  printf("\nMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the");
  printf("\nGNU General Public License for more details.");
  printf("\n\nYou should have received a copy of the GNU General Public License");
  printf("\nalong with this program; if not, write to the Free Software");
  printf("\nFoundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA\n\n");
  
  char again='y';
  while(again == 'y' || again=='Y')
  {
    int password_length=0;
    int choice=0;
    printf("\n1: (a-z)\t\t\t\t\tvery easy password");
    printf("\n2: (A-Z)\t\t\t\t\tvery easy password");
    printf("\n3: (a-z,A-Z)\t\t\t\t\teasy password");
    printf("\n4: (a-z,0-9)\t\t\t\t\tmedium password");
    printf("\n5: (A-Z,a-z,0-9)\t\t\t\thard password");
    printf("\n6: (a-z,0-9, \\ ] [ ^ _ )\t\t\thard password");
    printf("\n7: ( ! \" # $ % ' ( * ) + , - . / ,a-z,0-9)\tvery hard password");
    printf("\n8: full keyboard characters (except space), almost impossible to crack\n\n");
    while (choice<1 || choice>8)
    {
        printf("Enter the characterset you wish to use: ");
        scanf("%d",&choice);
    }  
    while((password_length<1)||(password_length>256))
    {
        printf("Enter the length of the password (max 256): ");
        scanf("%d",&password_length);
        if (password_length<8)
        {
          printf("\n\nChoosen password is only %d characters long!",password_length);
          printf("\nRemember, a password is as strong as its length!");
          printf("\nThe above gradations only apply with a minimal password length of 8.\n");
        }    
          
    }
    printf("\nYour password is: ");  
    switch(choice)
    {
        case 1:
            very_easy_password(password_length);
            break;
        case 2:
            very_easy2_password(password_length);
            break;
        case 3:
            easy_password(password_length);
            break;
        case 4:
            medium_password(password_length);
            break;
        case 5: 
            hard_password(password_length);
            break;
        case 6:
            hard2_password(password_length);
            break;
        case 7:
            very_hard_password(password_length);
            break;
        case 8:
            extreme_password(password_length);
            break;
        default:
            break;
    }
    printf("\nWant to generate another password (y/n)?");
    again=getch();
    printf("\n\n");
  }
  printf("Thank you for using my program, for questions/comments contact me at");
  printf("\nscorpius_unknown@yahoo.com");
  printf("\nPress any key to exit");
  char any=getch();
  return 0;  
}



/*(a-z) very easy password*/

void very_easy_password(length)
{
  srand(time(NULL));
  while (length>0)
  {
    int cha;
    cha=rand()%128;
    if((cha>=97 && cha<=122))
    {
      printf("%c",cha);
      length--;
    }
  }
}

/* (A-Z) also very easy password */
void very_easy2_password(length)
{
  srand(time(NULL));
  while (length>0)
  {
    int cha;
    cha=rand()%128;
    if((cha>=65 && cha<=90))
    {
      printf("%c",cha);
      length--;
    }
  }
}

/*(A-Z,a-z), easy password*/

void easy_password(length)
{
  srand(time(NULL));
  while (length>0)
  {
    int cha;
    cha=rand()%128;
    if((cha>=65 && cha<=90) || (cha>=97 && cha<=122))
    {
      printf("%c",cha);
      length--;
    }
  }
}

/*(a-z,0-9) medium password*/

void medium_password(length)
{
  srand(time(NULL));
  while (length>0)
  {
    int cha;
    cha=rand()%128;
    if((cha>=48 && cha<=57) ||(cha>=97 && cha<=122))
    {
      printf("%c",cha);
      length--;
    }
  }
}


/*(A-Z,a-z,0-9) hard password*/

void hard_password(length)
{
  srand(time(NULL));
  while (length>0)
  {
    int cha;
    cha=rand()%128;
    if((cha>=48 && cha<=57) || (cha>=65 && cha<=90) || (cha>=97 && cha<=122))
    {
      printf("%c",cha);
      length--;
    }
  }
}

/*(a-z,0-9, \ ] [ ^ _ ) hard password*/

void hard2_password(length)
{
  srand(time(NULL));
  while (length>0)
  {
    int cha;
    cha=rand()%128;
    if((cha>=48 && cha<=57) || (cha>=91 && cha<=95) || (cha>=97 && cha<=122))
    {
      printf("%c",cha);
      length--;
    }
  }
}

/*( ! " # $ % ' ( * ) + , - . / ,a-z,0-9) very hard password*/

void very_hard_password(length)
{
  srand(time(NULL));
  while (length>0)
  {
    int cha;
    cha=rand()%128;
    if((cha>=48 && cha<=57) || (cha>=65 && cha<=90) || (cha>=97 && cha<=122))
    {
      printf("%c",cha);
      length--;
    }
  }
}

/*full keyboard characters (except space), almost impossible to crack */

void extreme_password(length)
{
  srand(time(NULL));
  while (length>0)
  {
    int cha;
    cha=rand()%128;
    if((cha>=33 && cha<=126))
    {
      printf("%c",cha);
      length--;
    }
  }
}