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md5 hash_hmac for php4

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  1. function hmac ($key, $data)
  2. {
  3.     // RFC 2104 HMAC implementation for php.
  4.     // Creates an md5 HMAC.
  5.     // Eliminates the need to install mhash to compute a HMAC
  6.     // Hacked by Lance Rushing
  7.  
  8.     $b = 64; // byte length for md5
  9.     if (strlen($key) > $b) {
  10.         $key = pack("H*",md5($key));
  11.     }
  12.     $key  = str_pad($key, $b, chr(0x00));
  13.     $ipad = str_pad('', $b, chr(0x36));
  14.     $opad = str_pad('', $b, chr(0x5c));
  15.     $k_ipad = $key ^ $ipad ;
  16.     $k_opad = $key ^ $opad;
  17.  
  18.     return md5($k_opad  . pack("H*",md5($k_ipad . $data)));
  19. }

URL: http://www.php.net/manual/en/function.mhash.php

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