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@@ -1,15 +1,16 @@
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-libtomcrypt
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-==========
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+# libtomcrypt
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See `doc/crypt.pdf` for a detailed documentation
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-Project Status
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---------------
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+## Project Status
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-develop: [](https://travis-ci.org/libtom/libtomcrypt) [](https://coveralls.io/r/libtom/libtomcrypt) [](https://scan.coverity.com/projects/487)
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+master: [](https://travis-ci.org/libtom/libtomcrypt) [](https://coveralls.io/r/libtom/libtomcrypt)
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-Submitting patches
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-------------------
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+develop: [](https://travis-ci.org/libtom/libtomcrypt) [](https://coveralls.io/r/libtom/libtomcrypt)
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+
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+[](https://scan.coverity.com/projects/487)
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+
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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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@@ -17,28 +18,100 @@ 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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-Branches
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---------
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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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-Building
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---------
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+## Configuration options
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-If you have `libtommath` installed on your system:
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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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- make CFLAGS="-DUSE_LTM -DLTM_DESC" EXTRALIBS="-ltommath" all
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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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-For building a shared library use:
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+Please have a look at `src/headers/tomcrypt_custom.h` for all available configuration options.
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- make -f makefile.shared CFLAGS="-DUSE_LTM -DLTM_DESC" EXTRALIBS="-ltommath" all
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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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-If you have `libtommath` in a non-standard location:
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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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+| `MAX_RSA_SIZE` | Per default set to `4096`, if you need support for importing or generating bigger RSA keys, change this at compile-time. |
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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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- make CFLAGS="-DUSE_LTM -DLTM_DESC -I/opt/devel/ltm" EXTRALIBS="/opt/devel/ltm/libtommath.a" all
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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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+
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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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+
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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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+
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+## Building the library
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+
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+There are several `makefile`s provided. Please choose the one that fits best for you.
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+
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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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+
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+### Make targets
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+
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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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+
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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* *\*6* |
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+| `timing` | builds the `timing` binary, which can be used to measure timings for algorithms and modes *\*4* *\*6* |
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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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+
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+*\*4* also builds `library`
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+
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+*\*5* broken build in some configurations, therefore not built by default
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-On unusual UNIX platforms, or if you do not have GNU make, have a look at `makefile.unix`.
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+*\*6* requires define of one of `USE_GMP`, `USE_LTM` or `USE_TFM` (+ the appropriate MPI provider)
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-On MS Windows try `libtomcrypt_VS2008.sln` (Visual Studio) or `makefile.mingw` or `makefile.msvc`.
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+### Examples
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+
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+You want to build the library as static library
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+
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+ make
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+
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+You want to build the library as shared library
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+
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+ make -f makefile.shared
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+
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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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+
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+ make CFLAGS="-DUSE_LTM -DLTM_DESC" EXTRALIBS="-ltommath" test
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+
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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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+
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+ make -f makefile.shared CFLAGS="-DUSE_TFM -DTFM_DESC" EXTRALIBS="-ltfm" all demos
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+
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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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+
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+ make CFLAGS="-DUSE_GMP -DGMP_DESC -DLTM_DESC -DTFM_DESC" EXTRALIBS="-lgmp" timing
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+
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+If you have `libtommath` in a non-standard location:
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+
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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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Steffen Jaeckel