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Signed-off-by: Aaron Raimist <aaron@raim.ist>
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Aaron Raimist 2019-05-01 19:31:23 -05:00 committed by Hubert Chathi
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Olm # Olm
===
An implementation of the Double Ratchet cryptographic ratchet described by An implementation of the Double Ratchet cryptographic ratchet described by
https://whispersystems.org/docs/specifications/doubleratchet/, written in C and https://whispersystems.org/docs/specifications/doubleratchet/, written in C and
C++11 and exposed as a C API. C++11 and exposed as a C API.
The specification of the Olm ratchet can be found in `<docs/olm.rst>`_. The specification of the Olm ratchet can be found in [docs/olm.md](docs/olm.md).
This library also includes an implementation of the Megolm cryptographic This library also includes an implementation of the Megolm cryptographic
ratchet, as specified in `<docs/megolm.rst>`_. ratchet, as specified in [docs/megolm.md](docs/megolm.md).
Building ## Building
--------
To build olm as a shared library run either: To build olm as a shared library run either:
.. code:: bash ```bash
cmake . -Bbuild
cmake . -Bbuild cmake --build build
cmake --build build ```
or: or:
.. code:: bash ```bash
make
make ```
Using cmake is the preferred method for building the shared library; the Using cmake is the preferred method for building the shared library; the
Makefile may be removed in the future. Makefile may be removed in the future.
To run the tests when using cmake, run: To run the tests when using cmake, run:
.. code:: bash ```bash
cd build/tests
cd build/tests ctest .
ctest . ```
To run the tests when using make, run: To run the tests when using make, run:
.. code:: bash ```bash
make test
make test ```
To build the JavaScript bindings, install emscripten from http://kripken.github.io/emscripten-site/ and then run: To build the JavaScript bindings, install emscripten from http://kripken.github.io/emscripten-site/ and then run:
.. code:: bash ```bash
make js
make js ```
Note that if you run emscripten in a docker container, you need to pass through Note that if you run emscripten in a docker container, you need to pass through
the EMCC_CLOSURE_ARGS environment variable. the EMCC_CLOSURE_ARGS environment variable.
To build the android project for Android bindings, run: To build the android project for Android bindings, run:
.. code:: bash ```bash
cd android
cd android ./gradlew clean assembleRelease
./gradlew clean assembleRelease ```
To build the Xcode workspace for Objective-C bindings, run: To build the Xcode workspace for Objective-C bindings, run:
.. code:: bash ```bash
cd xcode
cd xcode pod install
pod install open OLMKit.xcworkspace
open OLMKit.xcworkspace ```
To build the Python bindings, first build olm as a shared library as above, and To build the Python bindings, first build olm as a shared library as above, and
then run: then run:
.. code:: bash ```bash
cd python
cd python make
make ```
to make both the Python 2 and Python 3 bindings. To make only one version, use to make both the Python 2 and Python 3 bindings. To make only one version, use
``make olm-python2`` or ``make olm-python3`` instead of just ``make``. ``make olm-python2`` or ``make olm-python3`` instead of just ``make``.
@ -80,27 +77,25 @@ to make both the Python 2 and Python 3 bindings. To make only one version, use
To build olm as a static library (which still needs libstdc++ dynamically) run To build olm as a static library (which still needs libstdc++ dynamically) run
either: either:
.. code:: bash ```bash
cmake . -Bbuild -DBUILD_SHARED_LIBS=NO
cmake . -Bbuild -DBUILD_SHARED_LIBS=NO cmake --build build
cmake --build build ```
or or
.. code:: bash ```bash
make static
make static ```
The library can also be used as a dependency with CMake using: The library can also be used as a dependency with CMake using:
.. code:: cmake ```cmake
find_package(Olm::Olm REQUIRED)
target_link_libraries(my_exe Olm::Olm)
```
find_package(Olm::Olm REQUIRED) ## Release process
target_link_libraries(my_exe Olm::Olm)
Release process
---------------
First: bump version numbers in ``common.mk``, ``CMakeLists.txt``, First: bump version numbers in ``common.mk``, ``CMakeLists.txt``,
``javascript/package.json``, ``python/olm/__version__.py``, ``OLMKit.podspec``, ``javascript/package.json``, ``python/olm/__version__.py``, ``OLMKit.podspec``,
@ -113,34 +108,32 @@ git.
It's probably sensible to do the above on a release branch (``release-vx.y.z`` It's probably sensible to do the above on a release branch (``release-vx.y.z``
by convention), and merge back to master once the release is complete. by convention), and merge back to master once the release is complete.
.. code:: bash ```bash
make clean
make clean # build and test C library
make test
# build and test C library # build and test JS wrapper
make test make js
(cd javascript && npm run test)
npm pack javascript
# build and test JS wrapper VERSION=x.y.z
make js scp olm-$VERSION.tgz packages@ares.matrix.org:packages/npm/olm/
(cd javascript && npm run test) git tag $VERSION -s
npm pack javascript git push --tags
VERSION=x.y.z # OLMKit CocoaPod release
scp olm-$VERSION.tgz packages@ares.matrix.org:packages/npm/olm/ # Make sure the version OLMKit.podspec is the same as the git tag
git tag $VERSION -s # (this must be checked before git tagging)
git push --tags pod spec lint OLMKit.podspec --use-libraries --allow-warnings
pod trunk push OLMKit.podspec --use-libraries --allow-warnings
# Check the pod has been successully published with:
pod search OLMKit
```
# OLMKit CocoaPod release ## Design
# Make sure the version OLMKit.podspec is the same as the git tag
# (this must be checked before git tagging)
pod spec lint OLMKit.podspec --use-libraries --allow-warnings
pod trunk push OLMKit.podspec --use-libraries --allow-warnings
# Check the pod has been successully published with:
pod search OLMKit
Design
------
Olm is designed to be easy port to different platforms and to be easy Olm is designed to be easy port to different platforms and to be easy
to write bindings for. to write bindings for.
@ -150,46 +143,40 @@ API. As development has progressed, it has become clear that C++ gives little
advantage, and new functionality is being added in C, with C++ parts being advantage, and new functionality is being added in C, with C++ parts being
rewritten as the need ariases. rewritten as the need ariases.
Error Handling ### Error Handling
~~~~~~~~~~~~~~
All C functions in the API for olm return ``olm_error()`` on error. All C functions in the API for olm return ``olm_error()`` on error.
This makes it easy to check for error conditions within the language bindings. This makes it easy to check for error conditions within the language bindings.
Random Numbers ### Random Numbers
~~~~~~~~~~~~~~
Olm doesn't generate random numbers itself. Instead the caller must Olm doesn't generate random numbers itself. Instead the caller must
provide the random data. This makes it easier to port the library to different provide the random data. This makes it easier to port the library to different
platforms since the caller can use whatever cryptographic random number platforms since the caller can use whatever cryptographic random number
generator their platform provides. generator their platform provides.
Memory ### Memory
~~~~~~
Olm avoids calling malloc or allocating memory on the heap itself. Olm avoids calling malloc or allocating memory on the heap itself.
Instead the library calculates how much memory will be needed to hold the Instead the library calculates how much memory will be needed to hold the
output and the caller supplies a buffer of the appropriate size. output and the caller supplies a buffer of the appropriate size.
Output Encoding ### Output Encoding
~~~~~~~~~~~~~~~
Binary output is encoded as base64 so that languages that prefer unicode Binary output is encoded as base64 so that languages that prefer unicode
strings will find it easier to handle the output. strings will find it easier to handle the output.
Dependencies ### Dependencies
~~~~~~~~~~~~
Olm uses pure C implementations of the cryptographic primitives used by Olm uses pure C implementations of the cryptographic primitives used by
the ratchet. While this decreases the performance it makes it much easier the ratchet. While this decreases the performance it makes it much easier
to compile the library for different architectures. to compile the library for different architectures.
Contributing ## Contributing
------------
Please see `<CONTRIBUTING.rst>`_ when making contributions to the library.
Security assessment Please see [CONTRIBUTING.md](CONTRIBUTING.md) when making contributions to the library.
-------------------
## Security assessment
Olm 1.3.0 was independently assessed by NCC Group's Cryptography Services Olm 1.3.0 was independently assessed by NCC Group's Cryptography Services
Practive in September 2016 to check for security issues: you can read all Practive in September 2016 to check for security issues: you can read all
@ -197,18 +184,16 @@ about it at
https://www.nccgroup.trust/us/our-research/matrix-olm-cryptographic-review/ https://www.nccgroup.trust/us/our-research/matrix-olm-cryptographic-review/
and https://matrix.org/blog/2016/11/21/matrixs-olm-end-to-end-encryption-security-assessment-released-and-implemented-cross-platform-on-riot-at-last/ and https://matrix.org/blog/2016/11/21/matrixs-olm-end-to-end-encryption-security-assessment-released-and-implemented-cross-platform-on-riot-at-last/
Bug reports ## Bug reports
-----------
Please file bug reports at https://github.com/matrix-org/olm/issues Please file bug reports at https://github.com/matrix-org/olm/issues
What's an olm? ## What's an olm?
--------------
It's a really cool species of European troglodytic salamander. It's a really cool species of European troglodytic salamander.
http://www.postojnska-jama.eu/en/come-and-visit-us/vivarium-proteus/ http://www.postojnska-jama.eu/en/come-and-visit-us/vivarium-proteus/
Legal Notice ## Legal Notice
------------
The software may be subject to the U.S. export control laws and regulations The software may be subject to the U.S. export control laws and regulations
and by downloading the software the user certifies that he/she/it is and by downloading the software the user certifies that he/she/it is