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+;;; guile-websocket --- WebSocket client/server
+;;; Copyright © 2016 David Thompson <davet@gnu.org>
+;;;
+;;; This file is part of guile-websocket.
+;;;
+;;; Guile-websocket is free software; you can redistribute it and/or modify
+;;; it under the terms of the GNU Lesser General Public License as
+;;; published by the Free Software Foundation; either version 3 of the
+;;; License, or (at your option) any later version.
+;;;
+;;; Guile-websocket is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; Lesser General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Lesser General Public
+;;; License along with guile-websocket.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; WebSocket utilities.
+;;
+;;; Code:
+
+(define-module (web socket utils)
+  #:use-module (rnrs bytevectors)
+  #:use-module (web socket base64)
+  #:use-module (web socket sha-1)
+  #:export (%handshake-guid
+            make-accept-key))
+
+;; See section 1.3 - Opening Handshake
+(define %handshake-guid "258EAFA5-E914-47DA-95CA-C5AB0DC85B11")
+
+(define (make-accept-key client-key)
+  "Return a WebSocket accept key based on CLIENT-KEY, a base64 encoded
+string."
+  (base64-encode
+   (sha-1->bytevector
+    (sha-1
+     (string->utf8
+      (string-append client-key %handshake-guid))))))