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PHP crypt() Blowfish Function Not Working

This is my first time using the crypt() function in PHP, and I can't figure out why it isn't working. My code is based on this article: http://www.techrepublic.com/blog/australia/securing-passwords-with-blowfish/1274

function blowfishHash ($pw) {
   //generate random salt
   $salt = "$2y$10$";
   for ($i = 0; $i < 22; $i++) {
       $salt .= substr("./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", mt_rand(0, 63), 1);
   }
  $hash = crypt($pw, $salt);

  //printout to file
  $file = fopen("debug.txt", "w+");
  fwrite($file, "\n\n\n".$pw);
  fwrite($file, "\n\n\n".$salt);
  fwrite($file, "\n\n\n".$hash);
  fclose($file);

  return $hash;
}

I called the function with the sample password "password".

The resultant salt was: $2y$10$NzRQNjTRfP4jXKvb4TCO.G
But the password was "$2mV0NZp92R3g" – which seems far too short.

Could someone please help me figure out what I'm doing wrong?

Solution

  • As you stated in your comment, you are using PHP 5.2.x.

    The Blowfish implementation is only available in PHP >= 5.3.x. If for any reason it is not possible to install a newer PHP version, you could check here on more information on how to make Blowfish work with older PHP versions.