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GnuTLS 2.6.3

From: Simon Josefsson
Subject: GnuTLS 2.6.3
Date: Fri, 12 Dec 2008 20:51:00 +0100
User-agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.0.60 (gnu/linux)

We are proud to announce a new stable GnuTLS release: Version 2.6.3.

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 GnuTLS library is distributed under the terms of the GNU Lesser
General Public License version 2.1 (or later).  The "extra" GnuTLS
library (which contains TLS/IA support, LZO compression and Libgcrypt
FIPS-mode handler), the OpenSSL compatibility library, the self tests
and the command line tools are all 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

Version 2.6.3 is a maintenance release on our stable branch.

** gnutls: Fix chain verification for chains that ends with RSA-MD2 CAs.
Reported by Michael Kiefer <address@hidden> in
<> forwarded by
Andreas Metzler <address@hidden> in

** gnutls: Fix memory leak in PSK authentication.
Reported by Michael Weiser <address@hidden> in

** certtool: Move gcry_control(GCRYCTL_ENABLE_QUICK_RANDOM, 0) call earlier.
It needs to be invoked before libgcrypt is initialized.

** gnutls-cli: Return non-zero exit code on error conditions.

** gnutls-cli: Corrected bug which caused a rehandshake request to be ignored.

** 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 (4.9MB):

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-2.6.3.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 <address@hidden>
uid                  Simon Josefsson <address@hidden>
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:

f9b6a1d6135ef0a57a5cdd9fcb3e82bc62a27dcd  gnutls-2.6.3.tar.bz2

8b9ab4067b8d761ff0362635f6f47be4595a8c86dbed069f37d37005  gnutls-2.6.3.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 uses
libgpg-error v1.6, libgcrypt v1.4.3, libtasn1 v1.5, and GnuTLS v2.6.3.

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:

a1623f4485deb3324e1bb35cd348cfdb4af32e37  gnutls-2.6.3.exe

3017d1979bd1520e522582a7f2327340594eb5100438e504d2c3b53b  gnutls-2.6.3.exe

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

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

4e5dbacd879b6ee6909681acd7080715aa50b02b  mingw32-gnutls_2.6.3-1_all.deb



GnuTLS messages have been translated into Dutch, French, 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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