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  • Bug fixes for general core bugs in 3.11.x will end 14 Nov 2022 (12 months plus 6 months extension).
  • Bug fixes for security issues in 3.11.x will end 13 Nov 2023 (18 months plus 12 months extension).
  • PHP version: minimum PHP 7.3.0 Note: minimum PHP version has increased since Moodle 3.10. PHP 7.4.x is supported too.
<?php

namespace IMSGlobal\LTI\OAuth;

/**
 * Class to represent an %OAuth HMAC_SHA256 signature method
 *
 * @author  Stephen P Vickers <svickers@imsglobal.org>
 * @copyright  IMS Global Learning Consortium Inc
 * @date  2016
 * @version 2015-11-30
 * @license https://opensource.org/licenses/MIT The MIT License
 */
/**
 * The HMAC-SHA256 signature method uses the HMAC-SHA256 signature algorithm as defined in [RFC6234]
 * where the Signature Base String is the text and the key is the concatenated values (each first
 * encoded per Parameter Encoding) of the Consumer Secret and Token Secret, separated by an '&'
 * character (ASCII code 38) even if empty.
 */
> #[\AllowDynamicProperties]
class OAuthSignatureMethod_HMAC_SHA256 extends OAuthSignatureMethod { function get_name() { return "HMAC-SHA256"; } public function build_signature($request, $consumer, $token) { $base_string = $request->get_signature_base_string(); $request->base_string = $base_string; $key_parts = array( $consumer->secret, ($token) ? $token->secret : "" ); $key_parts = OAuthUtil::urlencode_rfc3986($key_parts); $key = implode('&', $key_parts); return base64_encode(hash_hmac('sha256', $base_string, $key, true)); } }