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Differences Between: [Versions 311 and 402] [Versions 311 and 403]

   1  <?php
   2  
   3  namespace IMSGlobal\LTI\OAuth;
   4  
   5  /**
   6   * Class to represent an %OAuth HMAC_SHA1 signature method
   7   *
   8   * @copyright  Andy Smith
   9   * @version 2008-08-04
  10   * @license https://opensource.org/licenses/MIT The MIT License
  11   */
  12  /**
  13   * The HMAC-SHA1 signature method uses the HMAC-SHA1 signature algorithm as defined in [RFC2104]
  14   * where the Signature Base String is the text and the key is the concatenated values (each first
  15   * encoded per Parameter Encoding) of the Consumer Secret and Token Secret, separated by an '&'
  16   * character (ASCII code 38) even if empty.
  17   *   - Chapter 9.2 ("HMAC-SHA1")
  18   */
  19  class OAuthSignatureMethod_HMAC_SHA1 extends OAuthSignatureMethod {
  20  
  21      function get_name() {
  22          return "HMAC-SHA1";
  23      }
  24  
  25      public function build_signature($request, $consumer, $token) {
  26  
  27          $base_string = $request->get_signature_base_string();
  28          $request->base_string = $base_string;
  29  
  30          $key_parts = array(
  31            $consumer->secret,
  32            ($token) ? $token->secret : ""
  33          );
  34  
  35          $key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
  36          $key = implode('&', $key_parts);
  37  
  38          return base64_encode(hash_hmac('sha1', $base_string, $key, true));
  39  
  40      }
  41  
  42  }