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GNU Libtasn1

Libtasn1 is the ASN.1 library used by GnuTLS, GNU Shishi and some other packages. It was originally written by Fabio Fiorina, and now maintained as a GNU package.

The goal of this implementation is to be highly portable, and only require an ANSI C99 platform.

For status information on what's happening with the package, see the NEWS file from live sources.

Libtasn1 is licensed under the GNU Lesser General Public License version 2.1 or later.

Downloading Libtasn1

Libtasn1 can be found on the main GNU ftp server: http://ftp.gnu.org/gnu/libtasn1/ (via http) and ftp://ftp.gnu.org/gnu/libtasn1/ (via ftp). It can also be found on one of the mirrors of ftp.gnu.org; please use a mirror if possible.

All official releases are signed with OpenPGP key with fingerprint 0xB565716F or OpenPGP key with fingerprint 0x9013B842.


The Libtasn1 manual is available online. Quick links to the most popular formats:

Mailing Lists

Everything related to Libtasn1 is discussed on the help-libtasn1 mailing list.

Announcements about Libtasn1 and most other GNU software are made on <info-gnu@gnu.org>.


The goal is to provide a library of high quality. We use autoconf, automake, and libtool to achieve high portability and gnulib to support a platform independent coding style. The self-tests are run under a CI on gitlab.


For development sources and other information, please see the Libtasn1 project page at savannah.gnu.org.

You can check out the sources by using git as follows:

$ git clone git://git.savannah.gnu.org/libtasn1.git
libtasn1 is being mirrored at gitlab.
$ git clone git@gitlab.com:gnutls/libtasn1.git


Libtasn1 is currently being maintained by Simon Josefsson and Nikos Mavrogiannopoulos. Please use the mailing lists above for contact.

Please remember that development of Libtasn1, and GNU in general, is a volunteer effort, and you also can contribute. For information, please read How to help GNU.


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