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libgcrypt - The GNU crypto library
------------------------------------
Version 1.1.43
Copyright 2000, 2002, 2003 Free Software Foundation, Inc.
This file is free software; as a special exception the author gives
unlimited permission to copy and/or distribute it, with or without
modifications, as long as this notice is preserved.
This file is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
THIS IS A DEVELOPMENT VERSION, THE FIRST STABLE VERSION WILL BE 1.2.0.
Overview
--------
Libgcrypt is a general purpose crypto library based on the code
used in GnuPG. We can't start with a new version number because
libgcrypt was part of gnupg 1.1 and some applications already used
it and tested for the version number. We believe that the API can
stay as it is, except that new functions may be added in the
future.
Libgcrypt depends on the library `libgpg-error', which must be
installed correctly before Libgcrypt is to be built.
CVS
---
If you are using the CVS version, make sure that you have the
latest GNU build tools installed and run ./autogen.sh before
trying to build the library. Instead of running autogen.sh,
something like `autoreconf -i --symlink' can be used to prepare
the tree for building as well.
You also need to enable maintainer mode at configure time with the
`--enable-maintainer-mode' configure switch; without this switch,
the documentation can not be build, since the file `version.texi',
which is needed for building the documentation, will only be
generated, if maintainer mode is enabled.
Mailing List
------------
You may want to join the developer's mailing list
gcrypt-devel@gnupg.org by sending mail with a subject of
"subscribe" to gcrypt-devel-request@gnupg.org. An archive of this
list is available at http://lists.gnupg.org .
License
-------
Most of this library is distributed under the terms of the GNU
Lesser General Public License (LGPL); see the file COPYING.LIB for
the actual terms. However some parts are distributed under the
GNU General Public License (GPL) so if you configure Libgcrypt to
include these modules, you have to comply with the conditions of
the GPL as found in the file COPYING. The modules under the GPL
are:
rndunix - Entropy gatherer for Unices without a /dev/random
rndw32 - Entropy gatherer for MS Windows
The documentation is available under the terms of the GNU Free
Documentation License; see the file COPYING.DOC for the terms.
This library used to be available under the GPL - this was changed
with version 1.1.7 with the rationale that there are now many free
crypto libraries available and many of them come with capabilities
similar to Libcrypt. We decided that to foster the use of
cryptography in Free Software an LGPLed library would make more
sense because it avoids problems due to license incompatibilities
between some Free Software licenses and the GPL.
Please note that in many cases it is better for a library to be
licensed under the GPL, so that it provides an advantage for free
software projects. The Lesser GPL is so named because it does
less to protect the freedom of the users of the code that it
covers. See http://www.gnu.org/philosophy/why-not-lgpl.html for
more explanation.
Configure options
-----------------
Here is a list of configure options which are sometimes useful
for installation.
--enable-m-guard
Enable the integrated malloc checking code. Please
note that this feature does not work on all CPUs
(e.g. SunOS 5.7 on UltraSparc-2) and might give
you a bus error.
--disable-asm
Do not use assembler modules. It is not possible
to use this on some CPU types.
--enable-ld-version-script
Libgcrypt tries to build a library where internal
symbols are not exported. This requires support
from ld and is currently enabled for a few OSes.
If you know that your ld supports the so called
ELF version scripts, you can use this option to
force its use. OTOH, if you get error message
from the linker, you probably want to use this
option to disable the use of version scripts.
Note, that you should never ever use an
undocumented symbol or one which is prefixed with
an underscore.
--enable-ciphers=list
--enable-pubkey-ciphers=list
--enable-digests=list
If not otherwise specified, all algorithms
included in the libgcrypt source tree are built.
An exception are algorithms, which depend on
features not provided by the system, like 64bit
data types. With these switches it is possible
to select exactly those algorithm modules, which
should be built.
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