Wally is a cross-platform, cross-language collection of useful primitives for cryptocurrency wallets.
Read the API documentation at https://wally.readthedocs.io.
Note that library interfaces may change slightly while the library design matures. Please see the CHANGES file to determine if the API has changed when upgrading.
Wally can currently be built for:
And can be used from:
- C and compatible languages which can call C interfaces
- C++ (see include/wally.hpp for C++ container support)
- Python 2.7+ or 3.x
$ ./tools/autogen.sh $ ./configure <options - see below> $ make $ make check
Building on macOS
$ brew install gnu-sed
If you wish to enable the SWIG interface, you will need install the Java JDK 8 or newer, and install SWIG:
$ brew install swig
--enable-debug. Enables debugging information and disables compiler optimisations (default: no).
--enable-export-all. Export all functions from the wally shared library. Ordinarily only API functions are exported. (default: no). Enable this if you want to test the internal functions of the library or are planning to submit patches.
--enable-swig-python. Enable the SWIG Python interface. The resulting shared library can be imported from Python using the generated interface file
src/swig_python/wallycore/__init__.py. (default: no).
--enable-swig-java. Enable the SWIG Java (JNI) interface. After building, see
src/swig_java/src/com/blockstream/libwally/Wally.javafor the Java interface definition (default: no).
--enable-elements. Enables support for Elements features, including Liquid support.
--enable-coverage. Enables code coverage (default: no) Note that you will need lcov installed to build with this option enabled and generate coverage reports.
--disable-shared. Disables building a shared library and builds a static library instead.
Recommended development configure options
$ ./configure --enable-debug --enable-export-all --enable-swig-python --enable-swig-java --enable-coverage
CC=clang to use clang for building instead of gcc, when both are
For python development, you can build and install wally using:
$ pip install .
It is suggested you only install this way into a virtualenv while the library is under heavy development.
If you wish to explicitly choose the python version to use, set the
PYTHON_VERSION environment variable (to e.g.
3 etc) before
running pip or (when compiling manually)
You can also install the binary wally releases using the released wheel files without having to compile the library, e.g.:
pip install wallycore-0.8.0-cp37-cp37m-linux_x86_64.whl
tools/build_python_wheels.sh builds the release files and can be
used as an example for your own python projects.
Android builds are currently supported for all Android binary targets using
the Android NDK. The script
tools/android_helpers.sh can be sourced from
the shell or scripts to make it easier to produce builds:
$ export ANDROID_HOME=/opt/android-sdk $ . ./tools/android_helpers.sh $ android_get_arch_list armeabi-v7a arm64-v8a x86 x86_64 # Prepare to build $ ./tools/cleanup.sh $ ./tools/autogen.sh # See the comments in tools/android_helpers.sh for arguments $ android_build_wally armeabi-v7a $ANDROID_NDK/toolchains/llvm/prebuilt/linux-x86_64 19 "--enable-swig-java"
tools/build_android_libraries.sh builds the Android release files and
can be used as an example for your own Android projects.
Please use pull requests on github to submit. Before producing your patch you
should format your changes using uncrustify
version 0.60 or later. The script
./tools/uncrustify will reformat all C
sources in the library as needed, with the currently chosen uncrustify options.
To reformat a single source file, use e.g.:
$ ./tools/uncrustify src/transaction.c
Or to reformat all source files, pass no arguments:
You should also make sure the existing tests pass and if possible write tests covering any new functionality, following the existing style. You can run the tests via:
$ make check
Generating a coverage report
To generate an HTML coverage report, install
lcov and use:
$ ./tools/cleanup.sh $ ./tools/autogen.sh $ ./configure --enable-debug --enable-export-all --enable-swig-python --enable-swig-java --enable-js_wrappers --enable-coverage $ make $ ./tools/coverage.sh clean $ make check $ ./tools/coverage.sh
The coverage report can then be viewed at
to increase the test coverage are welcome.
Users of libwally-core
Projects and products that are known to depend on or use
- Blockstream Green Command Line Wallet
- Blockstream Green Development Kit
- Blockstream Green Wallet for Android
- Blockstream Green Wallet for iOS
- gdk_rpc for bitcoind/liquidd
- GreenAddress Recovery Tool
- GreenAddress Wallet for Windows/Mac/Linux
- GreenAddress Web Files
- LibWally Swift
Please note that some of listed projects may be experimental or superseded.