doc: Scute can be used to sign documents.

* doc/manual/scute.texi: Explain how to use Scute with LibreOffice.
* doc/manual/libreoffice-certificate-selection.png: New image.
* doc/manual/libreoffice-digital-signatures.png: New image.
* doc/manual/libreoffice-pdf-signature.png: New image.
* doc/manual/Makefile.am: Include the new images.
* README: Mention that Scute can work with LibreOffice.
* doc/website/index.xhtml: Likewise.

Signed-off-by: Damien Goutte-Gattat <dgouttegattat@incenp.org>

README

@@ -26,7 +26,8 @@ authentication with SSL in Mozilla.  See below for more details on how
 to get this working.
 
 Scute also allows you to sign emails with Thunderbird, using the
-S/MIME protocol.
+S/MIME protocol, and to sign OpenDocument and PDF files with
+LibreOffice.
 
 
 Prerequisites

doc/manual/Makefile.am

@@ -35,7 +35,9 @@ images = firefox-cm.png firefox-cm-view-detail.png firefox-cm-view.png \
 	firefox-dm-load-after.png firefox-dm-load-before.png \
 	firefox-dm-load.png firefox-dm-token-present.png firefox-pref.png \
 	firefox-pref-view.png firefox-bad-pin.png \
-	thunderbird-account-settings.png thunderbird-smime-button.png
+	thunderbird-account-settings.png thunderbird-smime-button.png \
+	libreoffice-certificate-selection.png \
+	libreoffice-digital-signatures.png libreoffice-pdf-signature.png
 
 images_eps = $(images:.png=.eps)
 

doc/manual/scute.texi

@@ -83,6 +83,7 @@ module.
 * Preparation::                   What you should do before using Scute.
 * Client Authentication::         How to use Scute for client authentication.
 * Email Signing::                 How to use Scute for S/MIME email signing.
+* Document Signing::              How to use Scute with LibreOffice.
 * Troubleshooting::               What to do when things go wrong.
 * Internals::                     Technical details about Scute.
 
@@ -118,6 +119,8 @@ Client Authentication
 
 Email Signing
 
+Document Signing
+
 Troubleshooting
 
 Internals
@@ -210,8 +213,8 @@ application and GnuPG 2.0.
 
 Currently supported usages are client authentication over HTTPS with
 Firefox (allowing users to authenticate themselves to a remote web
-service without entering their log-in information), and email signing
-with Thunderbird.
+service without entering their log-in information), email signing
+with Thunderbird, and document signing with LibreOffice.
 
 
 @node Preparation
@@ -574,6 +577,37 @@ will be prompted for your User PIN before the message is sent.
 @center @image{thunderbird-smime-button,13cm}
 
 
+@node Document Signing
+@chapter Document Signing
+
+Scute can also be used with LibreOffice to sign OpenDocument files.
+
+First, you must load the Scute module into Mozilla Firefox according to
+the above procedure.  Then, configure LibreOffice to use Firefox's
+certificate store by defining the @code{MOZILLA_CERTIFICATE_FOLDER}
+environment variable to your Firefox profile directory.
+
+Then, to sign the document you are editing, select the
+@code{File->Digital Signatures...} menu option to open the
+@code{Digital Signatures} dialog.
+
+@center @image{libreoffice-digital-signatures,13cm}
+
+Click the @code{Sign Document} button to open the certificate selection
+dialog.  Select your card-based certificate, then validate.  Enter your
+User PIN when prompted by GPG Agent.
+
+@center @image{libreoffice-certificate-selection,13cm}
+
+You may also sign a PDF export of your document.  Select the
+@code{File->Export as PDF...} menu option to open the @code{PDF Options}
+dialog.  In the @code{Digital Signatures} tab, use the @code{Select}
+button to open the certificate selection dialog as above.  You will be
+prompted for your User PIN when you will click the @code{Export} button.
+
+@center @image{libreoffice-pdf-signature,13cm}
+
+
 @node Troubleshooting
 @chapter Troubleshooting
 

doc/website/index.xhtml

@@ -67,8 +67,8 @@
 	<p>
 	  Currently, supported usages are <a
 	  href="http://en.wikipedia.org/wiki/Https">HTTPS</a> client
-          authentication and S/MIME email signing using X.509
-          certificates.
+          authentication, S/MIME email signing, and document signing with
+          <a href="http://www.libreoffice.org/">LibreOffice</a>.
 	</p>
 	<p>
 	  You can <a href="documentation.xhtml">read the