<?php
/*
 * This code is part of GOsa (http://www.gosa-project.org)
 * Copyright (C) 2003-2008 GONICUS GmbH
 *
 * ID: $$Id$$
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

class passwordMethodCrypt extends passwordMethod
{
  function passwordMethodCrypt($config)
  {
  }


  function is_available()
  {
    if(function_exists("crypt")){
      return true;
    }else{
      return false;
    }
  }


  function generate_hash($pwd)
  {
    if ($this->hash == "crypt/standard-des"){
      $salt = "";
      for ($i = 0; $i < 2; $i++) {
          $salt .= get_random_char();
      }
    }

    if ($this->hash == "crypt/enhanced-des"){
      $salt = "_";
      for ($i = 0; $i < 8; $i++) {
          $salt .= get_random_char();
      }
    }

    if ($this->hash == "crypt/md5"){
      $salt = "\$1\$";
      for ($i = 0; $i < 8; $i++) {
          $salt .= get_random_char();
      }
      $salt .= "\$";
    }

    if ($this->hash == "crypt/blowfish"){
      $salt = "\$2a\$07\$";
      for ($i = 0; $i < CRYPT_SALT_LENGTH; $i++) {
          $salt .= get_random_char();
      }
      $salt .= "\$";
    }

    return "{CRYPT}".crypt($pwd, $salt);
  }


  function get_hash_name()
  {
    $hashes= array();
    if (CRYPT_STD_DES == 1) {
      $hashes[]= "crypt/standard-des";
    }

    if (CRYPT_EXT_DES == 1) {
      $hashes[]= "crypt/enhanced-des";
    }

    if (CRYPT_MD5 == 1) {
      $hashes[]= "crypt/md5";
    }

    if (CRYPT_BLOWFISH == 1) {
      $hashes[]= "crypt/blowfish";
    }

    return $hashes;
  }


  function _extract_method($password_hash)
  {
    if (!preg_match('/^{crypt}/i', $password_hash)){
      return "";
    }

    $password_hash= preg_replace('/^{[^}]+}!?/', '', $password_hash);

    if (preg_match("/^[a-zA-Z0-9.\/][a-zA-Z0-9.\/]/", $password_hash)){
      return "crypt/standard-des";
    }

    if (preg_match("/^_[a-zA-Z0-9.\/]/", $password_hash)){
      return "crypt/enhanced-des";
    }
    
    if (preg_match('/^\$1\$/', $password_hash)){
      return "crypt/md5";
    }

    if (preg_match('/^(\$2\$|\$2a\$)/', $password_hash)){
      return "crypt/blowfish";
    }

    return "";
  }

}

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?>