[Announce] Libgcrypt 1.6.5 with security fix released
wk at gnupg.org
Tue Feb 9 16:25:04 CET 2016
The GNU project is pleased to announce the availability of Libgcrypt
version 1.6.5. This is a security fix release to mitigate a new side
Libgcrypt is a general purpose library of cryptographic building blocks.
It does not provide any implementation of OpenPGP or other protocols.
Thorough understanding of applied cryptography is required for proper
Noteworthy changes in version 1.6.5
* Mitigate side-channel attack on ECDH with Weierstrass curves
[CVE-2015-7511]. See http://www.cs.tau.ac.IL/~tromer/ecdh/ for
* Fix build problem on Solaris.
Please follow the instructions found at <https://gnupg.org/download/> or
Libgcrypt may be downloaded from one of the GnuPG mirror sites or
From its primary FTP server. The list of mirrors can be found at
<https://gnupg.org/download/mirrors.html>. Note that Libgcrypt is
not available at ftp.gnu.org.
The Libgcrypt source code compressed using BZIP2 and its OpenPGP
signature are available here:
The same source code but compressed with the older GZIP algorithm is
The affected ECDH algorithm is for example used by GnuPG 2.1 (modern).
An update of Libgcrypt is sufficient to fix this for GnuPG. We have
also updated the Windows installer of that GnuPG version to include this
fixed version of Libgcrypt:
The source used to build that Windows installer can be found in the same
directory with a ".tar.xz" suffix.
Checking the Integrity
In order to check that the version of Libgcrypt you are going to build
is an original and unmodified one, you can do it in one of the following
* Check the supplied OpenPGP signature. For example to check the
signature of the file libgcrypt-1.6.5.tar.bz2 you would use this
gpg --verify libgcrypt-1.6.5.tar.bz2.sig libgcrypt-1.6.5.tar.bz2
This checks whether the signature file matches the source file.
You should see a message indicating that the signature is good and
made by one or more of the release signing keys. Make sure that
this is a valid key, either by matching the shown fingerprint
against a trustworthy list of valid release signing keys or by
checking that the key has been signed by trustworthy other keys.
See below for information on the signing keys.
* If you are not able to use GnuPG, you have to verify the SHA-1
checksum. On Unix systems the command to do this is either
"sha1sum" or "shasum". Assuming you downloaded the file
libgcrypt-1.6.5.tar.bz2, you run the command like this:
and check that the output matches the first line from the
Release Signing Keys
To guarantee that a downloaded Libgcrypt version has not been tampered
by malicious entities we provide signature files for all tarballs. The
keys are also signed by the long term keys of their respective owners.
Current releases are signed by one or more of these four keys:
2048R/4F25E3B6 2011-01-12 [expires: 2019-12-31]
Key fingerprint = D869 2123 C406 5DEA 5E0F 3AB5 249B 39D2 4F25 E3B6
Werner Koch (dist sig)
rsa2048/E0856959 2014-10-29 [expires: 2019-12-31]
Key fingerprint = 46CC 7308 65BB 5C78 EBAB ADCF 0437 6F3E E085 6959
David Shaw (GnuPG Release Signing Key) <dshaw 'at' jabberwocky.com>
rsa2048/33BD3F06 2014-10-29 [expires: 2016-10-28]
Key fingerprint = 031E C253 6E58 0D8E A286 A9F2 2071 B08A 33BD 3F06
NIIBE Yutaka (GnuPG Release Key) <gniibe 'at' fsij.org>
rsa2048/7EFD60D9 2014-10-19 [expires: 2020-12-31]
Key fingerprint = D238 EA65 D64C 67ED 4C30 73F2 8A86 1B1C 7EFD 60D9
Werner Koch (Release Signing Key)
You may retrieve these keys from a keyserver using this command
gpg --keyserver hkp://keys.gnupg.net --recv-keys \
249B39D24F25E3B6 04376F3EE0856959 \
The keys are also available at <https://gnupg.org/signature_key.html> and
in any recently released GnuPG tarball in the file g10/distsigkey.gpg .
Note that this mail has been signed by a different key.
Libgcrypt is distributed under the terms of the GNU Lesser General
Public License (LGPLv2.1+). The helper programs as well as the
documentation are distributed under the terms of the GNU General Public
License (GPLv2+). The file LICENSES has notices about contributions
that require these additional notices are distributed.
For help on developing with Libgcrypt you should read the included
manual and optional ask on the gcrypt-devel mailing list . A
listing with commercial support offers for Libgcrypt and related
software is available at the GnuPG web site .
If you are a developer and you may need a certain feature for your
project, please do not hesitate to bring it to the gcrypt-devel mailing
list for discussion.
Please consult the archive of the gcrypt-devel mailing list before
reporting a bug <https://gnupg.org/documentation/mailing-lists.html>.
We suggest to send bug reports for a new release to this list in favor
of filing a bug at <https://bugs.gnupg.org>. For commercial support
requests we keep a list of known service companies at:
If you are a developer and you need a certain feature for your project,
please do not hesitate to bring it to the gcrypt-devel mailing list for
Maintenance and development of Libgcrypt is mostly financed by donations.
We currently employ 3 full-time developers, one part-timer, and one
contractor. They all work on GnuPG and closely related software like
Libgcrypt. Please see
on how you can help.
We have to thank all the people who helped with this release, be it
testing, coding, suggesting, auditing, administering the servers,
spreading the word, answering questions on the mailing lists, and
donating money. Niibe Yutaka did most of the work on fixing the side
channel attack. Special thanks to Daniel Genkin, Lev Pachmanov, Itamar
Pipman, and Eran Tromer for notifying us about their attack in advance
and testing the fix.
For the Libgcrypt hackers,
This is a announcement only mailing list. Please send replies only to
the gcrypt-devel at gnupg.org mailing list.
Die Gedanken sind frei. Ausnahmen regelt ein Bundesgesetz.
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