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1 README for mbed TLS
5 -------------
7 mbed TLS should build out of the box on most systems. Some platform specific options are available in the fully documented configuration file `include/mbedtls/config.h`, which is also the place where features can be selected. This file can be edited manually, or in a more programmatic way using the Perl script `scripts/config.pl` (use `--help` for usage instructions).
12 ---------
14 There are currently four active build systems used within mbed TLS releases:
16 - yotta
17 - Make
18 - CMake
19 - Microsoft Visual Studio (Visual Studio 6 and Visual Studio 2010)
21 The main systems used for development are CMake and Make. Those systems are always complete and up-to-date. The others should reflect all changes present in the CMake and Make build system, although features may not be ported there automatically.
25 - it provides a minimalistic configuration file by default
26 - depending on the yotta target, features of mbed OS may be used in examples and tests
28 The Make and CMake build systems create three libraries: libmbedcrypto, libmbedx509, and libmbedtls. Note that libmbedtls depends on libmbedx509 and libmbedcrypto, and libmbedx509 depends on libmbedcrypto. As a result, some linkers will expect flags to be in a specific order, for example the GNU linker wants `-lmbedtls -lmbedx509 -lmbedcrypto`. Also, when loading shared libraries using dlopen(), you'll need to load libmbedcrypto first, then libmbedx509, before you can load libmbedtls.
32 [yotta](http://yottabuild.org) is a package manager and build system developed by mbed, and is the build system of mbed OS 16.03. To install it on your platform, please follow the yotta [installation instructions](http://docs.yottabuild.org/#installing).
34 Once yotta is installed, you can use it to download the latest version of mbed TLS from the yotta registry with:
42 If, on the other hand, you already have a copy of mbed TLS from a source other than the yotta registry, for example from cloning our GitHub repository, or from downloading a tarball of the standalone edition, then you'll first need to generate the yotta module by running:
44 yotta/create-module.sh
46 This should be executed from the root mbed TLS project directory. This will create the yotta module in the `yotta/module` directory within it. You can then change to that directory and build as usual:
53 For more details on the yotta/mbed OS edition of mbed TLS, including example programs, please consult the [Readme at the root of the yotta module](https://github.com/ARMmbed/mbedtls/blob/development/yotta/data/README.md).
75 In order to build for a Windows platform, you should use `WINDOWS_BUILD=1` if the target is Windows but the build environment is Unix-like (for instance when cross-compiling, or compiling from an MSYS shell), and `WINDOWS=1` if the build environment is a Windows shell (for instance using mingw32-make) (in that case some targets will not be available).
77 Setting the variable `SHARED` in your environment will build shared libraries in addition to the static libraries. Setting `DEBUG` gives you a debug build. You can override `CFLAGS` and `LDFLAGS` by setting them in your environment or on the make command line; if you do so, essential parts such as `-I` will still be preserved. Warning options may be overridden separately using `WARNING_CFLAGS`.
79 Depending on your platform, you might run into some issues. Please check the Makefiles in `library/`, `programs/` and `tests/` for options to manually add or remove for specific platforms. You can also check [the mbed TLS Knowledge Base](https://tls.mbed.org/kb) for articles on your platform or issue.
81 In case you find that you need to do something else as well, please let us know what, so we can add it to the [mbed TLS knowledge base](https://tls.mbed.org/kb).
96 cmake -DENABLE_TESTING=Off .
104 cmake -DUSE_SHARED_MBEDTLS_LIBRARY=On .
106 There are many different build modes available within the CMake buildsystem. Most of them are available for gcc and clang, though some are compiler-specific:
108 - Release. This generates the default code without any unnecessary information in the binary files.
109 - Debug. This generates debug information and disables optimization of the code.
110 - Coverage. This generates code coverage information in addition to debug information.
111 - ASan. This instruments the code with AddressSanitizer to check for memory errors. (This includes LeakSanitizer, with recent version of gcc and clang.) (With recent version of clang, this mode also instruments the code with UndefinedSanitizer to check for undefined behaviour.)
112 - ASanDbg. Same as ASan but slower, with debug information and better stack traces.
113 - MemSan. This instruments the code with MemorySanitizer to check for uninitialised memory reads. Experimental, needs recent clang on Linux/x86\_64.
114 - MemSanDbg. Same as MemSan but slower, with debug information, better stack traces and origin tracking.
115 - Check. This activates the compiler warnings that depend on optimization and treats all warnings as errors.
119 cmake -D CMAKE_BUILD_TYPE=Debug .
123 cmake -LH
127 find . -iname '*cmake*' -not -name CMakeLists.txt -exec rm -rf {} +
128 CC=gcc CFLAGS='-fstack-protector-strong -Wa,--noexecstack' cmake .
136 Example programs
137 ----------------
139 We've included example programs for a lot of different features and uses in `programs/`. Most programs only focus on a single feature or usage scenario, so keep that in mind when copying parts of the code.
142 -----
144 mbed TLS includes an elaborate test suite in `tests/` that initially requires Perl to generate the tests files (e.g. `test\_suite\_mpi.c`). These files are generated from a `function file` (e.g. `suites/test\_suite\_mpi.function`) and a `data file` (e.g. `suites/test\_suite\_mpi.data`). The `function file` contains the test functions. The `data file` contains the test cases, specified as parameters that will be passed to the test function.
148 - `tests/ssl-opt.sh` runs integration tests for various TLS options (renegotiation, resumption, etc.) and tests interoperability of these options with other implementations.
149 - `tests/compat.sh` tests interoperability of every ciphersuite with other implementations.
150 - `tests/scripts/test-ref-configs.pl` test builds in various reduced configurations.
151 - `tests/scripts/key-exchanges.pl` test builds in configurations with a single key exchange enabled
152 - `tests/scripts/all.sh` runs a combination of the above tests, plus some more, with various build options (such as ASan, full `config.h`, etc).
155 --------------
157 We provide some non-standard configurations focused on specific use cases in the `configs/` directory. You can read more about those in `configs/README.txt`
160 ------------
164 - All contributions, whether large or small require a Contributor's License Agreement (CLA) to be accepted. This is because source code can possibly fall under copyright law and we need your consent to share in the ownership of the copyright.
165 - We would ask that contributions conform to [our coding standards](https://tls.mbed.org/kb/development/mbedtls-coding-standards), and that contributions should be fully tested before submission.
166 - As with any open source project, contributions will be reviewed by the project team and community and may need some modifications to be accepted.
168 To accept the Contributor’s Licence Agreement (CLA), individual contributors can do this by creating an mbed account and [accepting the online agreement here with a click through](https://developer.mbed.org/contributor_agreement/). Alternatively, for contributions from corporations, or those that do not wish to create an mbed account, a slightly different agreeement can be found [here](https://www.mbed.com/en/about-mbed/contributor-license-agreements/). This agreement should be signed and returned to ARM as described in the instructions given.
172 1. [Check for open issues](https://github.com/ARMmbed/mbedtls/issues) or [start a discussion](https://tls.mbed.org/discussions) around a feature idea or a bug.
173 2. Fork the [mbed TLS repository on GitHub](https://github.com/ARMmbed/mbedtls) to start making your changes. As a general rule, you should use the "development" branch as a basis.