www-apps/gc-fallout/dev/shacrypt.php

   1 <?php
   2
   3 function base64_url_encode($input) {
   4     return strtr(base64_encode($input), '+=', '_-');
   5 }
   6
   7 function base64_url_decode($input) {
   8     return base64_decode(strtr($input, '_-', '+='));
   9 }
  10
  11 function rand_iv()
  12 {
  13     $t = time();
  14     $s = sha1($t);
  15     return substr($s, 0, 4);
  16 }
  17
  18 function sha1_encrypt($iv, $pass, $plain)
  19 {
  20  $i = 0;
  21  $len = strlen($plain);
  22  $cipher = $pass;
  23  $result = '';
  24  while ($i < $len) {
  25         $cipher = sha1("/$iv/$cipher/$i/$pass/", true);
  26 #       echo "key: /$cipher/$i/$pass/<br />\n";
  27         $pool = strlen($cipher); // 20
  28         $chunk = substr($plain, $i, $pool);
  29         $i += $pool;
  30         $r = $cipher ^ $chunk;
  31         $result .= $r;
  32  }
  33  return $result;
  34 }
  35
  36 $plaintext = 'test34543 ggopkp 45 34  56 4kl lkklklfwekjerkw rweklj lkj54iojfjddfklrjrltjertr etkrjekltjd';
  37
  38 $iv_r = rand_iv();
  39 echo "iv_r: $iv_r <br />\n";
  40 $iv ='abcdefghjklmnopqrst' ;
  41
  42 $enc = sha1_encrypt($iv_r, $iv, $plaintext);
  43
  44
  45 echo  " <br />\n";
  46 $benc = base64_url_encode($iv_r . $enc);
  47 echo $benc . " <br />\n";
  48 #echo ase64_url_encode($enc) . " <br />\n";
  49
  50 echo "\n<hr />\n";
  51
  52
  53 $dbenc = base64_url_decode($benc);
  54 $iv_r2 = substr($dbenc, 0,4);
  55 echo "iv_r: $iv_r2 <br />\n";
  56 echo substr($dbenc,4);
  57 $dec = sha1_encrypt($iv_r, $iv, substr($dbenc,4));
  58
  59 echo "'$dec' <br />\n";
  60 if ($dec == $plaintext) { echo ' OK '; }
  61
  62 echo "\n<br />\n";
  63
  64 echo urlencode("_-=,.");