function _openid_hmac in Drupal 7

Same name and namespace in other branches

1. 6 modules/openid/openid.inc \_openid_hmac()

1 call to _openid_hmac()

_openid_signature in modules/openid/openid.inc

Sign certain keys in a message

File

modules/openid/openid.inc, line 454

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(0x0));
  $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;
}