[gnutls-dev] GnuTLS 2.0.0

Simon Josefsson simon at josefsson.org
Tue Sep 4 09:44:55 CEST 2007

We are pleased to announce a new stable GnuTLS release: Version 2.0.0.

GnuTLS is a modern C library that implement the standard network
security protocol Transport Layer Security (TLS), for use by network
applications.  GnuTLS is developed for GNU/Linux, but works on many
Unix-like systems and comes with a binary installer for Windows.

The core GnuTLS library is distribute under the terms of the GNU Lesser
General Public License version 2.1 (or later).  The "extra" GnuTLS
libraries -- which contains OpenPGP and TLS/IA support, LZO2
compression, the OpenSSL compatibility library -- and the self tests and
command line tools are distributed under the GNU General Public License
version 2.0 (or later).  The manual is distributed under the GNU Free
Documentation License version 1.2 (or later).

The project page of the library is available at:

What's New

The following changes have been made since GnuTLS 1.6:

* Support for external RSA/DSA signing for TLS client authentication.
  This allows you to secure the private key better, for example by using
  privilege-separation techniques between the private key and the
  network client/server.

* Support for signing X.509 certificates using RSA with SHA-256/384/512.

* Experimental support for TLS 1.2 (disabled by default).  The TLS 1.2
  specification is not finalized yet, but we implement a draft version
  for testing.

* Support for X.509 Proxy Certificates (RFC 3820)

* Support for Supplemental handshakes messages (RFC 4680).

* Support for TLS authorization extension (draft-housley-tls-authz-extns-07).

* Support for the X.509 'otherName' Subject Altnerative Names (for XMPP).

* Guile bindings for GnuTLS have been added, thanks to Ludovic Courtès.

* Improve logic of gnutls_set_default_priority() which can now be more

* New APIs to enumerate supported algorithms in the library.

* New APIs to access X.509 Certificate extension sequentially.

* New APIs to print X.509 Certificates and CRLs in human readable formats.

* New APIs to extract X.509 Distinguished Names from certificates.

* New APIs to handle pathLenConstraint in X.509 Basic Constraints.

* Certtool can export more than one certificate to PKCS#12.

* Several message translation improvements.

* Instructions and improvements to easily set up a HTTPS test server.

* Included copies updated to Libtasn1 1.1 and OpenCDK 0.6.4.

* Build improvements for Windows, Mac OS X, uClinux, etc.

* GnuTLS is now developed in GIT.

* Improved manual

* Many bugfixes and minor improvements.

Getting the Software

GnuTLS may be downloaded from one of the mirror sites or direct from
<ftp://ftp.gnutls.org/pub/gnutls/>.  The list of mirrors can be found at
<http://www.gnu.org/software/gnutls/download.html>.  Note, that GnuPG is
not available at ftp.gnu.org.

Here are the BZIP2 compressed sources (4.6MB):


Here are OpenPGP detached signatures signed using key 0xB565716F:


Note, that we don't distribute gzip compressed tarballs.

In order to check that the version of GnuTLS which you are going to
install is an original and unmodified one, you should verify the OpenPGP
signature.  You can use the command

     gpg --verify gnutls-2.0.0.tar.bz2.sig

This checks whether the signature file matches the source file.  You
should see a message indicating that the signature is good and made by
that signing key.  Make sure that you have the right key, either by
checking the fingerprint of that key with other sources or by checking
that the key has been signed by a trustworthy other key.  The signing
key can be identified with the following information:

pub   1280R/B565716F 2002-05-05 [expires: 2008-06-30]
      Key fingerprint = 0424 D4EE 81A0 E3D1 19C6  F835 EDA2 1E94 B565 716F
uid                  Simon Josefsson <simon at josefsson.org>
uid                  Simon Josefsson <jas at extundo.com>
sub   1280R/4D5D40AE 2002-05-05 [expires: 2008-06-30]

The key is available from:

Alternatively, after successfully verifying the OpenPGP signature of
this announcement, you could verify that the files match the following
checksum values.  The values are for SHA-1 and SHA-224 respectively:

985d86cb942b9d79abb5c8966439f23141ad803a  gnutls-2.0.0.tar.bz2

9ffe06f0fea815daaf975e39cfa0be38edc74dc8908c05a6870dede0  gnutls-2.0.0.tar.bz2


The manual is available online at:


In particular the following formats are available:

 HTML: http://www.gnu.org/software/gnutls/manual/html_node/index.html
 PDF: http://www.gnu.org/software/gnutls/manual/gnutls.pdf

For developers there is a GnuTLS API reference manual formatted using
the GTK-DOC tools:



If you need help to use GnuTLS, or want to help others, you are invited
to join our help-gnutls mailing list, see:

If you wish to participate in the development of GnuTLS, you are invited
to join our gnutls-dev mailing list, see:

Windows installer

GnuTLS has been ported to the Windows operating system, and a binary
installer is available.  The installer contains DLLs for application
development, manuals, examples, and source code.  The installer consists
of libgpg-error 1.5, libgcrypt 1.3.0, libtasn1 1.1, opencdk 0.6.4, and
GnuTLS 2.0.0.

For more information about GnuTLS for Windows:

The Windows binary installer and PGP signature:
  http://josefsson.org/gnutls4win/gnutls-2.0.0.exe (24MB)

The checksum values for SHA-1 and SHA-224 are:

0261c116f3abdf179c0a93d04488f06b693a128a  gnutls-2.0.0.exe

d8af39cb1bcecd5c8dc9386c68edb171a20720c88e53f5443abd0bbb  gnutls-2.0.0.exe


GnuTLS messages have been translated into German, Malay, Polish and
Swedish.  We welcome the addition of more translations.


Improving GnuTLS is costly, but you can help!  We are looking for
organizations that find GnuTLS useful and wish to contribute back.  You
can contribute by reporting bugs, improve the software, or donate money
or equipment.

Commercial support contracts for GnuTLS are available, and they help
finance continued maintenance.  Simon Josefsson Datakonsult, a Stockholm
based privately held company, is currently funding GnuTLS maintenance.
We are always looking for interesting development projects.  See
http://josefsson.org/ for more details.

The GnuTLS service directory is available at:


Happy Hacking,
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