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   1  <?php
   2  /*
   3   * Copyright 2011 Google Inc.
   4   *
   5   * Licensed under the Apache License, Version 2.0 (the "License");
   6   * you may not use this file except in compliance with the License.
   7   * You may obtain a copy of the License at
   8   *
   9   *     http://www.apache.org/licenses/LICENSE-2.0
  10   *
  11   * Unless required by applicable law or agreed to in writing, software
  12   * distributed under the License is distributed on an "AS IS" BASIS,
  13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14   * See the License for the specific language governing permissions and
  15   * limitations under the License.
  16   */
  17  
  18  /**
  19   * Signs data.
  20   *
  21   * @author Brian Eaton <beaton@google.com>
  22   */
  23  abstract class Google_Signer_Abstract
  24  {
  25    /**
  26     * Signs data, returns the signature as binary data.
  27     */
  28    abstract public function sign($data);
  29  }