'H32', 'sha1' => 'H40'); if ( !isset($packs[$algo]) ) return false; $pack = $packs[$algo]; if (strlen($key) > 64) $key = pack($pack, $algo($key)); $key = str_pad($key, 64, chr(0)); $ipad = (substr($key, 0, 64) ^ str_repeat(chr(0x36), 64)); $opad = (substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64)); $hmac = $algo($opad . pack($pack, $algo($ipad . $data))); if ( $raw_output ) return pack( $pack, $hmac ); return $hmac; } if ( !function_exists('json_encode') ) { function json_encode( $string ) { global $wp_json; if ( !is_a($wp_json, 'Services_JSON') ) { require_once( ABSPATH . WPINC . '/class-json.php' ); $wp_json = new Services_JSON(); } return $wp_json->encodeUnsafe( $string ); } } if ( !function_exists('json_decode') ) { function json_decode( $string, $assoc_array = false ) { global $wp_json; if ( !is_a($wp_json, 'Services_JSON') ) { require_once( ABSPATH . WPINC . '/class-json.php' ); $wp_json = new Services_JSON(); } $res = $wp_json->decode( $string ); if ( $assoc_array ) $res = _json_decode_object_helper( $res ); return $res; } function _json_decode_object_helper($data) { if ( is_object($data) ) $data = get_object_vars($data); return is_array($data) ? array_map(__FUNCTION__, $data) : $data; } } if ( ! function_exists( 'hash_equals' ) ) : /** * Compare two strings in constant time. * * This function was added in PHP 5.6. * It can leak the length of a string. * * @since 3.9.2 * * @param string $a Expected string. * @param string $b Actual string. * @return bool Whether strings are equal. */ function hash_equals( $a, $b ) { $a_length = strlen( $a ); if ( $a_length !== strlen( $b ) ) { return false; } $result = 0; // Do not attempt to "optimize" this. for ( $i = 0; $i < $a_length; $i++ ) { $result |= ord( $a[ $i ] ) ^ ord( $b[ $i ] ); } return $result === 0; } endif;