File

drupal-7.x/modules/openid/openid.inc, line 448

OpenID utility functions.

Code

function _openid_hmac($key, $text) {
  if (strlen($key) > OPENID_SHA1_BLOCKSIZE) {
    $key = sha1($key, TRUE);
  }

  $key = str_pad($key, OPENID_SHA1_BLOCKSIZE, chr(0x00));
  $ipad = str_repeat(chr(0x36), OPENID_SHA1_BLOCKSIZE);
  $opad = str_repeat(chr(0x5c), OPENID_SHA1_BLOCKSIZE);
  $hash1 = sha1(($key ^ $ipad) . $text, TRUE);
  $hmac = sha1(($key ^ $opad) . $hash1, TRUE);

  return $hmac;
}