Libgcrypt 1.7.5 released

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Libgcrypt 1.7.5 released

Werner Koch

The GnuPG Project is pleased to announce the availability of Libgcrypt
version 1.7.5.  This is a maintenace release.

Libgcrypt is a general purpose library of cryptographic building blocks.
It is originally based on code used by GnuPG.  It does not provide any
implementation of OpenPGP or other protocols.  Thorough understanding of
applied cryptography is required to use Libgcrypt.

Noteworthy changes in version 1.7.5 (2016-12-15)

 * Bug fixes:

   - Fix regression in mlock detection introduced with 1.7.4 [bug#2870].

Noteworthy changes in version 1.7.4 (2016-12-09)

 * Performance:

   - More ARMv8/AArch32 improvements for AES, GCM, SHA-256, and SHA-1.

   - Add ARMv8/AArch32 assembly implementation for Twofish and

   - Add bulk processing implementation for ARMv8/AArch32.

   - Add Stribog OIDs.

   - Improve the DRBG performance and sync the code with the Linux

 * Internal changes:

   - When secure memory is requested by the MPI functions or by
     gcry_xmalloc_secure, they do not anymore lead to a fatal error if
     the secure memory pool is used up.  Instead new pools are
     allocated as needed.  These new pools are not protected against
     being swapped out (mlock can't be used).  However, these days
     this is considered a minor issue and can easily be mitigated by
     using encrypted swap space.

 * Bug fixes:

   - Fix GOST 28147 CryptoPro-B S-box.

   - Fix error code handling of mlock calls.


Source code is hosted at the GnuPG FTP server and its mirrors as listed
at .  On the primary server
the source tarball and its digital signature are: (2816k)

That file is bzip2 compressed.  A gzip compressed version is here: (3365k)

The same files are also available via HTTP:

In order to check that the version of Libgcrypt you downloaded is an
original and unmodified file please follow the instructions found at
<>.  In short, you may
use one of the following methods:

 - Check the supplied OpenPGP signature.  For example to check the
   signature of the file libgcrypt-1.7.5.tar.bz2 you would use this

     gpg --verify libgcrypt-1.7.5.tar.bz2.sig libgcrypt-1.7.5.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 the end of this mail for information on the signing keys.

 - If you are not able to use an existing version of 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-1.7.5.tar.bz2, you run the command like this:

     sha1sum libgcrypt-1.7.5.tar.bz2

   and check that the output matches the first line from the
   this list:

fa485d854748fc06ea041b3057b2de2f12fbc17f  libgcrypt-1.7.5.tar.bz2
9dc6171c0d6b46a7bc38e4af65091044633dc59a  libgcrypt-1.7.5.tar.gz

   You should also verify that the checksums above are authentic by
   matching them with copies of this announcement.  Those copies can be
   found at other mailing lists, web sites, and search engines.


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 that 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 [1].  A
listing with commercial support offers for Libgcrypt and related
software is available at the GnuPG web site [2].

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.

Maintenance and development of Libgcrypt is mostly financed by
donations; see <>.  We currently employ
3 full-time developers, one part-timer, and one contractor to work on
GnuPG and closely related software like Libgcrypt.


We like to thank all the people who helped with this release, be it
testing, coding, translating, suggesting, auditing, administering the
servers, spreading the word, and answering questions on the mailing
lists.  Also many thanks to all our donors [3].

For the GnuPG hackers,



This is an announcement only mailing list.  Please send replies only to
the gcrypt-devel 'at' mailing list.

List of Release Signing Keys:

To guarantee that a downloaded GnuPG version has not been tampered by
malicious entities we provide signature files for all tarballs and
binary versions.  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'>

  rsa2048/33BD3F06 2014-10-29 [expires: 2020-10-30]
  Key fingerprint = 031E C253 6E58 0D8E A286  A9F2 2071 B08A 33BD 3F06
  NIIBE Yutaka (GnuPG Release Key) <gniibe 'at'>

  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:// --recv-keys  \
                  249B39D24F25E3B6 04376F3EE0856959 \
                  2071B08A33BD3F06 8A861B1C7EFD60D9

The keys are also available at and
in any recently released GnuPG tarball in the file g10/distsigkey.gpg .
Note that this mail has been signed by a different key.

Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.

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