GnuTLS 2.4.1

Simon Josefsson simon at
Mon Jun 30 23:36:52 CEST 2008

We are proud to announce a new stable GnuTLS release: Version 2.4.1.

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 TLS/IA support, LZO compression -- and the
OpenSSL compatibility library self tests and command line tools are
distributed under the GNU General Public License version 3.0 (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

Changes compared to the last stable release version 2.4.1:

** libgnutls: Fix local crash in gnutls_handshake.  [GNUTLS-SA-2008-2]
If the gnutls_handshake function is called for a normal session, which
can happen for re-handshakes, the library would crash because it tried
to hash some data using a libgcrypt handle that had been deallocated.
Report and tiny patch from Tomas Mraz <tmraz at>.  Any updates
with more details about this vulnerability will be added to

** libgnutls: Fix memory leaks when doing a re-handshake.
Reported by Sam Varshavchik <mrsam at> in

** Fix compiler warnings.
Reported by Massimo Gaspari <massimo.gaspari at> in

** Fix ordering of -I's to avoid opencdk.h conflict with system headers.
Reported by Roman Bogorodskiy <novel at> in

** srptool: Fix a problem where --verify check does not succeed.
Report and tiny patch by Matthias Koenig <mkoenig at> in

** API and ABI modifications:
No changes since last version.

Getting the Software

GnuTLS may be downloaded from one of the mirror sites or direct from
<>.  The list of mirrors can be found at

Here are the BZIP2 compressed sources (4.8MB):

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-2.4.1.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: 2009-04-21]
      Key fingerprint = 0424 D4EE 81A0 E3D1 19C6  F835 EDA2 1E94 B565 716F
uid                  Simon Josefsson <simon at>
uid                  Simon Josefsson <jas at>
sub   1280R/4D5D40AE 2002-05-05 [expires: 2009-04-21]

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:

7a439542e6344d5ccf11a29431a0600e7fe1c735  gnutls-2.4.1.tar.bz2

b38deef0f27412212b02c871e584d3ae9958c8d445de21c5496f2c49  gnutls-2.4.1.tar.bz2


The manual is available online at:

In particular the following formats are available:


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 1.6, libgcrypt 1.4.1, libtasn1 1.4, and GnuTLS 2.4.1.

For more information about GnuTLS for Windows:

The Windows binary installer and PGP signature: (14MB)

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

a629764717b16f545e0a91f116215df36c5219fe  gnutls-2.4.1.exe

0d3cdd14f01d58644045d440ef95fc78ab55de03e605999621b601d7  gnutls-2.4.1.exe

Thanks to Enrico Tassi, we also have mingw32 *.deb's available:

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

92a1efe32fe3e3e14807a4b4543e5902ef56389c  mingw32-gnutls_2.4.1-1_all.deb

a0776c2f5cc3e06d79fc1df3bc58cbf59e2b5ed920c72a6ac53e9139  mingw32-gnutls_2.4.1-1_all.deb


GnuTLS messages have been translated into Dutch, German, Malay, Polish,
Swedish, and Vietnamese.  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 for more details.

The GnuTLS service directory is available at:

Happy Hacking,
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