<?php

/*
 * Copyright 2011 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

final class PhabricatorHash {

  public static function digest($string) {
    $key = PhabricatorEnv::getEnvConfig('security.hmac-key');
    if (!$key) {
      throw new Exception(
        "Set a 'security.hmac-key' in your Phabricator configuration!");
    }

    return hash_hmac('sha1', $string, $key);
  }

}