174 lines
8.1 KiB
Markdown
174 lines
8.1 KiB
Markdown
# libtomcrypt
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Previously the git repository contained `doc/crypt.pdf` for detailed documentation.
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This was changed and the file is now only available from the tarball of the appropriate version
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or from the page https://github.com/libtom/libtomcrypt/releases .
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## Project Status
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master: [](https://travis-ci.org/libtom/libtomcrypt) [](https://coveralls.io/r/libtom/libtomcrypt)
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develop: [](https://travis-ci.org/libtom/libtomcrypt) [](https://coveralls.io/r/libtom/libtomcrypt)
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[](https://scan.coverity.com/projects/487)
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API/ABI changes: [check here](https://abi-laboratory.pro/tracker/timeline/libtomcrypt/)
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## Submitting patches
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Please branch off from develop if you want to submit a patch.
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Patch integration will be faster if tests and documentation are included.
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Please update the makefiles in a separate commit. To update them simply run the `updatemakes.sh` script.
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If you have something bigger to submit, feel free to contact us beforehand.
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Then we can give you write access to this repo, so you can open your PR based on this repo
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and we can easier follow the rebase-before-merge approach we're using (or even do the rebase ourself).
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### Reviews
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We're using Pull Request reviews to make sure that the code is in line with the existing code base.
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Please have a look [here](https://help.github.com/articles/approving-a-pull-request-with-required-reviews/) to get an idea of the approach.
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## Branches
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Please be aware, that all branches besides _master_ and _develop_ __can__ and __will be__ force-pushed, rebased and/or removed!
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If you want to rely on such an _unstable_ branch, create your own fork of this repository to make sure nothing breaks for you.
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## Configuration options
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By default the library builds its entire feature set (besides `katja`) in a (depending on your needs more or less) optimal way.
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There are numerous configuration options available if you want to trim down the functionality of the library.
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Please have a look at `src/headers/tomcrypt_custom.h` for all available configuration options.
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The following list is a small part of the available, but the most often required, configuration switches.
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| Flag | Behavior |
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| ---- | -------- |
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| `LTC_NO_TEST` | Remove all algorithm self-tests from the library |
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| `LTC_NO_FILE` | Remove all API functions requiring a pre-defined `FILE` data-type (mostly useful for embedded targets) |
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| `GMP_DESC` | enable [gmp](https://gmplib.org/) as MPI provider *\*1* |
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| `LTM_DESC` | enable [libtommath](http://www.libtom.net/) as MPI provider *\*1* |
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| `TFM_DESC` | enable [tomsfastmath](http://www.libtom.net/) as MPI provider *\*1* *\*2* |
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| `USE_GMP` | use `gmp` as MPI provider when building the binaries *\*3* |
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| `USE_LTM` | use `libtommath` as MPI provider when building the binaries *\*3* |
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| `USE_TFM` | use `tomsfastmath` as MPI provider when building the binaries *\*3* |
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*\*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.
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*\*2* Please be aware that `tomsfastmath` has the limitation of a fixed max size of MPI's.
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*\*3* Only one is supported at the time & this is only required when building the binaries, not when building the library itself.
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## Building the library
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There are several `makefile`s provided. Please choose the one that fits best for you.
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| makefile | use-case |
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| -------- | -------- |
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| `makefile` | builds a static library (GNU Make required) |
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| `makefile.shared` | builds a shared (and static) library (GNU Make required) |
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| `makefile.unix` | for unusual UNIX platforms, or if you do not have GNU Make |
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| `makefile.mingw` | for usage with the mingw compiler on MS Windows |
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| `makefile.msvc` | for usage with the MSVC compiler on MS Windows |
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| `libtomcrypt_VS2008.sln` | A VisualStudio 2008 project for MS Windows |
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### Make targets
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The `makefile`s provide several targets to build (VS project excluded).
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The following list does not claim to be complete resp. to be available across all `makefile` variants.
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| target | application |
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| ------ | ----------- |
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| *empty target*/none given | c.f. `library`
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| `library` | builds only the library |
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| `hashsum` | builds the `hashsum` binary, similar to [`shasum`](https://linux.die.net/man/1/shasum), but with support for all hash-algorithms included in the library *\*4* |
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| `ltcrypt` | builds the `ltcrypt` binary, implementing something similar to [`crypt`](https://linux.die.net/man/3/crypt) *\*4* |
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| `sizes` | builds the `sizes` binary, printing all internal data sizes on invocation *\*4* |
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| `constants` | builds the `constants` binary, printing all internal constants on invocation *\*4* |
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| `openssl-enc` | builds the `openssl-enc` binary, which is more or less compatible to [`openssl enc`](https://linux.die.net/man/1/enc) *\*4* *\*5* |
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| `test` | builds the `test` binary, which runs all algorithm self-tests + some extended tests *\*4* |
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| `timing` | builds the `timing` binary, which can be used to measure timings for algorithms and modes *\*4* |
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| `bins` | builds `hashsum` *\*4* |
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| `all_test` | builds `test`, `hashsum`, `ltcrypt`, `small`, `tv_gen`, `sizes` & `constants` *\*4* |
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| `docs` | builds the developer documentation `doc/crypt.pdf` |
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| `install` | installs the `library` and header files *\*7* *\*8* |
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| `install_bins` | installs the binaries created by the `bins` target *\*7* *\*8* |
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| `install_docs` | installs the documentation created by the `docs` target *\*7* *\*8* |
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| `install_test` | installs the test-app created by the `test` target *\*7* *\*8* |
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| `install_all` | installs everything (i.e. `library`, `bins`, `docs` and `test`) *\*8* |
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| `uninstall` | uninstalls the `library` and header files |
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*\*4* also builds `library`
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*\*5* broken build in some configurations, therefore not built by default
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*\*7* also builds the necessary artifact(s) before installing it
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*\*8* also have a look at the 'Installation' section of this file
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### Examples
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You want to build the library as static library
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make
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You want to build the library as shared library
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make -f makefile.shared
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You have `libtommath` installed on your system and want to build a static library and the `test` binary to run the self-tests.
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make CFLAGS="-DUSE_LTM -DLTM_DESC" EXTRALIBS="-ltommath" test
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You have `tomsfastmath` installed on your system and want to build a shared library and all binaries
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make -f makefile.shared CFLAGS="-DUSE_TFM -DTFM_DESC" EXTRALIBS="-ltfm" all demos
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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`.
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make CFLAGS="-DUSE_GMP -DGMP_DESC -DLTM_DESC -DTFM_DESC" EXTRALIBS="-lgmp" timing
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If you have `libtommath` in a non-standard location:
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make CFLAGS="-DUSE_LTM -DLTM_DESC -I/opt/devel/ltm" EXTRALIBS="/opt/devel/ltm/libtommath.a" all
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## Installation
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There exist several _install_ make-targets which are described in the table above.
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These targets support the standard ways (c.f. [[GNU]], [[FreeBSD]])
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to modify the installation path via the following set of variables:
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DESTDIR
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PREFIX
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LIBPATH
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INCPATH
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DATAPATH
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BINPATH
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The entire set of the variables is only supported in `makefile`, `makefile.shared` and `makefile.unix`.
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In case you have to use one of the other makefiles, check in the file which variables are supported.
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### Examples
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You want to install the static library to the default paths
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make install
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You want to install the shared library to a special path and use it from this path
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make -f makefile.shared PREFIX=/opt/special/path
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Have a look at the developer documentation, [[GNU]] or [[FreeBSD]] to get a detailed explanation of all the variables.
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[GNU]: https://www.gnu.org/prep/standards/html_node/DESTDIR.html
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[FreeBSD]: https://www.freebsd.org/doc/en/books/porters-handbook/porting-prefix.html
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