#!/usr/bin/php
<?php
// $Id$

/**
 * Drupal hash to phpass conversion script
 *
 * Check for your PHP interpreter - on Windows you'll probably have to
 * replace line 1 with
 *   #!c:/program files/php/php.exe
 *
 * @param hash
 *  A Drupal hash, should look similar to $D:14:Bq9E7iTn:Ihs+yAzwCsoEqCQyv3XqYQ==
 */
 
/**
 * Returns a string for mapping an int to the corresponding base 64 character.
 */
function _passwordhash_itoa64() {
  return './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
}


/**
 * Encodes bytes into printable base 64, up to a set number of bytes.
 *
 * @param $input
 *   The string containing bytes to encode.
 * @param $count
 *   The number of characters (bytes) to encode.
 *
 * @return
 *   Encoded string
 */
function  _passwordhash_encode64($input, $count)  {
  $output = '';
  $i = 0;
  $itoa64 = _passwordhash_itoa64();
  do {
    $value = ord($input[$i++]);
    $output .= $itoa64[$value & 0x3f];
    if ($i < $count) {
      $value |= ord($input[$i]) << 8;
    }
    $output .= $itoa64[($value >> 6) & 0x3f];
    if ($i++ >= $count) {
      break;
    }
    if ($i < $count) {
      $value |= ord($input[$i]) << 16;
    }
    $output .= $itoa64[($value >> 12) & 0x3f];
    if ($i++ >= $count) {
      break;
    }
    $output .= $itoa64[($value >> 18) & 0x3f];
  } while ($i < $count);

  return $output;
}
 
$script_name = array_shift($_SERVER['argv']);

foreach ($_SERVER['argv'] as $hash) {
  $parts = explode(':', $hash);

  if (count($parts) == 4) {
    $itoa64 = _passwordhash_itoa64();
    $output = '$P$';
    $output .= $itoa64[$parts[1]];
    $output .= $parts[2];
    $output .= _passwordhash_encode64(base64_decode($parts[3]), 16);
  
    print $output ."\n";
  }
  else {
    print "Error - please use a Drupal hash as the argument to the script";
  }
}