<?php namespace Eher\OAuth; /** * The HMAC-SHA1 signature method uses the HMAC-SHA1 signature algorithm as defined in [RFC2104] * 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. * - Chapter 9.2 ("HMAC-SHA1") */ class HmacSha1 extends SignatureMethod { function get_name() { return "HMAC-SHA1"; } 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 : "" ); $key_parts = Util::urlencode_rfc3986($key_parts); $key = implode('&', $key_parts); return base64_encode(hash_hmac('sha1', $base_string, $key, true)); } }