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libgcrypt - The GNU crypto library
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Copyright 2000, 2002, 2003, 2004, 2005, 2006,
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2007 Free Software Foundation, Inc.
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Copyright 2000, 2002, 2003, 2004, 2007,
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2008 Free Software Foundation, Inc.
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This file is free software; as a special exception the author gives
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unlimited permission to copy and/or distribute it, with or without
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Libgcrypt is a general purpose crypto library based on the code
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used in GnuPG. We can't start with a new version number because
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libgcrypt was part of gnupg 1.1 and some applications already used
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it and tested for the version number. We believe that the API can
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stay as it is, except that new functions may be added in the
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Libgcrypt depends on the library `libgpg-error', which must be
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installed correctly before Libgcrypt is to be built.
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used in GnuPG. Libgcrypt depends on the library `libgpg-error',
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which must be installed correctly before Libgcrypt is to be built.
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Libgcrypt is distributed under the LGPL, see the section "License"
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The download canonical location for libgcrypt is:
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ftp://ftp.gnupg.org/gcrypt/libgcrypt/
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To build libgcrypt you need libgpg-error:
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ftp://ftp.gnupg.org/gcrypt/libgpg-error/
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You should get the latest versions of course.
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After building and installing the libgpg-error package, you may
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continue with Libgcrypt installation As with allmost all GNU
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packages, you just have to do
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The "make check" is not required but a good idea to see whether
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the library works as expected. The check takes some while and
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prints some benchmarking results. Before doing "make install" you
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probably need to become root.
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To build libgcrypt for Microsoft Windows, you need to have the
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mingw32 cross-building toolchain installed. Instead of running a
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plain configure you use
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./autogen.sh --build-w32
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By default this command sequences expectsd a libgpg-error
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installed below $HOME/w32root and installs libgcrypt to that
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directory too. See the autogen.sh code for details.
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The documentation is available as an Info file (gcrypt.info). To
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build documentation in PDF, run this:
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list is available at http://lists.gnupg.org .
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Most of this library is distributed under the terms of the GNU
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Lesser General Public License (LGPL); see the file COPYING.LIB for
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the actual terms. However some parts are distributed under the
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GNU General Public License (GPL) so if you configure Libgcrypt to
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include these modules, you have to comply with the conditions of
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the GPL as found in the file COPYING. The modules under the GPL
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rndunix - Entropy gatherer for Unices without a /dev/random
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rndw32 - Entropy gatherer for MS Windows
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The documentation is available under the terms of the GNU Free
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Documentation License; see the file COPYING.DOC for the terms.
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This library used to be available under the GPL - this was changed
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with version 1.1.7 with the rationale that there are now many free
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crypto libraries available and many of them come with capabilities
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similar to Libcrypt. We decided that to foster the use of
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cryptography in Free Software an LGPLed library would make more
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sense because it avoids problems due to license incompatibilities
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between some Free Software licenses and the GPL.
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Please note that in many cases it is better for a library to be
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licensed under the GPL, so that it provides an advantage for free
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software projects. The Lesser GPL is so named because it does
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less to protect the freedom of the users of the code that it
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covers. See http://www.gnu.org/philosophy/why-not-lgpl.html for
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Here is a list of configure options which are sometimes useful
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features not provided by the system, like 64bit
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data types. With these switches it is possible
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to select exactly those algorithm modules, which
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should be built. The algorithms are to be
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separated by spaces, commas or colons. To view
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the list used with the current build the program
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tests/version may be used.
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--disable-endian-check
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Don't let configure test for the endianness but
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try to use the OS provided macros at compile
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time. This is helpful to create OS X fat binaries.
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--enable-random-daemon
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Include support for a global random damon and
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build the daemon. This is an experimental feature.
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--enable-mpi-path=EXTRA_PATH
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Prepend EXTRA_PATH to list of CPU specific
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optimizations. For example, if you want to add
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optimizations forn a Intel Pentium 4 compatible
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--enable-mpi-path=pentium4/sse2:pentium4/mmx
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Take care: The generated library may crash on
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Force the use of the random gathering module
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NAME. Default is either to use /dev/random or
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the auto mode. Possible values for NAME are:
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egd - Use the module which accesses the
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Entropy Gathering Daemon. See the webpages
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for more information about it.
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unix - Use the standard Unix module which does not
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have a very good performance.
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linux - Use the module which accesses /dev/random.
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This is the first choice and the default one
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for GNU/Linux or *BSD.
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auto - Compile linux, egd and unix in and
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automagically select at runtime.
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--disable-padlock-support
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Disable support for the PadLock engine of VIA
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processors. The default is to use PadLock if
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available. Try this if you get problems with
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The library is distributed under the terms of the GNU Lesser
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General Public License (LGPL); see the file COPYING.LIB for the
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actual terms. The helper programs (gcryptrnd and getrandom) as
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well as the documentation are distributed under the terms of the
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GNU General Public License (GPL); see the file COPYING for teh
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This library used to be available under the GPL - this was changed
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with version 1.1.7 with the rationale that there are now many free
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crypto libraries available and many of them come with capabilities
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similar to Libcrypt. We decided that to foster the use of
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cryptography in Free Software an LGPLed library would make more
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sense because it avoids problems due to license incompatibilities
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between some Free Software licenses and the GPL.
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Please note that in many cases it is better for a library to be
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licensed under the GPL, so that it provides an advantage for free
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software projects. The Lesser GPL is so named because it does
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less to protect the freedom of the users of the code that it
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covers. See http://www.gnu.org/philosophy/why-not-lgpl.html for
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See the file AUTHORS.
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Commercial grade support for Libgcrypt is available; please see
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http://www.gnupg.org/service.html .
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This file is Free Software; as a special exception the authors gives
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unlimited permission to copy and/or distribute it, with or without
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modifications, as long as this notice is preserved. For conditions
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of the whole package, please see the file COPYING. This file is
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distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY, to the extent permitted by law; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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