libtomcrypt

Previously the git repository contained doc/crypt.pdf for detailed documentation. This was changed and the file is now only available from the tarball of the appropriate version or from the page https://github.com/libtom/libtomcrypt/releases .

Project Status

Travis CI

master:

develop:

AppVeyor

master:

develop:

Coverity

ABI Laboratory

API/ABI changes: check here

Submitting patches

Please branch off from develop if you want to submit a patch.

Patch integration will be faster if tests and documentation are included.

Please update the makefiles in a separate commit. To update them simply run the updatemakes.sh script.

If you have something bigger to submit, feel free to contact us beforehand. Then we can give you write access to this repo, so you can open your PR based on this repo and we can easier follow the rebase-before-merge approach we're using (or even do the rebase ourself).

Reviews

We're using Pull Request reviews to make sure that the code is in line with the existing code base.

Please have a look here to get an idea of the approach.

Branches

Please be aware, that all branches besides master and develop can and will be force-pushed, rebased and/or removed!

If you want to rely on such an unstable branch, create your own fork of this repository to make sure nothing breaks for you.

Configuration options

By default the library builds its entire feature set (besides katja) in a (depending on your needs more or less) optimal way.

There are numerous configuration options available if you want to trim down the functionality of the library.

Please have a look at src/headers/tomcrypt_custom.h for all available configuration options.

The following list is a small part of the available, but the most often required, configuration switches.

*1 It is possible to build the library against all MPI providers in parallel and choose at startup-time which math library should be used.

*2 Please be aware that tomsfastmath has the limitation of a fixed max size of MPI's.

*3 Only one is supported at the time & this is only required when building the binaries, not when building the library itself.

Building the library

There are several makefiles provided. Please choose the one that fits best for you.

Make targets

The makefiles provide several targets to build (VS project excluded). The following list does not claim to be complete resp. to be available across all makefile variants.

*4 also builds library

*5 broken build in some configurations, therefore not built by default

*7 also builds the necessary artifact(s) before installing it

*8 also have a look at the 'Installation' section of this file

Examples

You want to build the library as static library

make

You want to build the library as shared library

make -f makefile.shared

You have libtommath installed on your system and want to build a static library and the test binary to run the self-tests.

make CFLAGS="-DUSE_LTM -DLTM_DESC" EXTRALIBS="-ltommath" test

You have tomsfastmath installed on your system and want to build a shared library and all binaries

make -f makefile.shared CFLAGS="-DUSE_TFM -DTFM_DESC" EXTRALIBS="-ltfm" all demos

You have gmp, libtommath and tomsfastmath installed on your system and want to build a static library and the timing binary to measure timings against gmp.

make CFLAGS="-DUSE_GMP -DGMP_DESC -DLTM_DESC -DTFM_DESC" EXTRALIBS="-lgmp" timing

If you have libtommath in a non-standard location:

make CFLAGS="-DUSE_LTM -DLTM_DESC -I/opt/devel/ltm" EXTRALIBS="/opt/devel/ltm/libtommath.a" all

Installation

There exist several install make-targets which are described in the table above.

These targets support the standard ways (c.f. [GNU], [FreeBSD]) to modify the installation path via the following set of variables:

DESTDIR
PREFIX
LIBPATH
INCPATH
DATAPATH
BINPATH

The entire set of the variables is only supported in makefile, makefile.shared and makefile.unix.

In case you have to use one of the other makefiles, check in the file which variables are supported.

Examples

You want to install the static library to the default paths

make install

You want to install the shared library to a special path and use it from this path

make -f makefile.shared PREFIX=/opt/special/path

Have a look at the developer documentation, [GNU] or [FreeBSD] to get a detailed explanation of all the variables.

CMake support

The project provides support for the CMake build system.

git clone https://github.com/libtom/libtomcrypt.git
mkdir -p libtomcrypt/build
cd libtomcrypt/build
cmake ..
make -j$(nproc)

More details around building with CMake can be found in the developer documentation.