Awesome
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
master: 
develop: 
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.
| Flag | Behavior |
|---|---|
LTC_NO_TEST | Remove all algorithm self-tests from the library |
LTC_NO_FILE | Remove all API functions requiring a pre-defined FILE data-type (mostly useful for embedded targets) |
GMP_DESC | enable gmp as MPI provider *1 |
LTM_DESC | enable libtommath as MPI provider *1 |
TFM_DESC | enable tomsfastmath as MPI provider *1 *2 |
USE_GMP | use gmp as MPI provider when building the binaries *3 |
USE_LTM | use libtommath as MPI provider when building the binaries *3 |
USE_TFM | use tomsfastmath as MPI provider when building the binaries *3 |
*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.
| makefile | use-case |
|---|---|
makefile | builds a static library (GNU Make required) |
makefile.shared | builds a shared (and static) library (GNU Make required) |
makefile.unix | for unusual UNIX platforms, or if you do not have GNU Make |
makefile.mingw | for usage with the mingw compiler on MS Windows |
makefile.msvc | for usage with the MSVC compiler on MS Windows |
libtomcrypt_VS2008.sln | A VisualStudio 2008 project for MS Windows |
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.
| target | application |
|---|---|
| empty target/none given | c.f. library |
library | builds only the library |
hashsum | builds the hashsum binary, similar to shasum, but with support for all hash-algorithms included in the library *4 |
ltcrypt | builds the ltcrypt binary, implementing something similar to crypt *4 |
sizes | builds the sizes binary, printing all internal data sizes on invocation *4 |
constants | builds the constants binary, printing all internal constants on invocation *4 |
openssl-enc | builds the openssl-enc binary, which is more or less compatible to openssl enc *4 *5 |
test | builds the test binary, which runs all algorithm self-tests + some extended tests *4 |
timing | builds the timing binary, which can be used to measure timings for algorithms and modes *4 |
bins | builds hashsum *4 |
all_test | builds test, hashsum, ltcrypt, small, tv_gen, sizes & constants *4 |
docs | builds the developer documentation doc/crypt.pdf |
install | installs the library and header files *7 *8 |
install_bins | installs the binaries created by the bins target *7 *8 |
install_docs | installs the documentation created by the docs target *7 *8 |
install_test | installs the test-app created by the test target *7 *8 |
install_all | installs everything (i.e. library, bins, docs and test) *8 |
uninstall | uninstalls the library and header files |
*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.