function _openid_hmac in Drupal 6

Same name and namespace in other branches

1. 7 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 246

OpenID utility functions.

Code

function _openid_hmac($key, $text) {
  if (strlen($key) > OPENID_SHA1_BLOCKSIZE) {
    $key = _openid_sha1($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);
  $hash1 = _openid_sha1(($key ^ $ipad) . $text, true);
  $hmac = _openid_sha1(($key ^ $opad) . $hash1, true);
  return $hmac;
}