elements/src/secp256k1

libsecp256k1-zkp

A fork of libsecp256k1 with support for advanced and experimental features such as Confidential Assets and MuSig2

Added features:

• Experimental module for ECDSA adaptor signatures.
• Experimental module for ECDSA sign-to-contract.
• Experimental module for MuSig2.
• Experimental module for Confidential Assets (Pedersen commitments, range proofs, and surjection proofs).
• Experimental module for Bulletproofs++ range proofs.
• Experimental module for address whitelisting.

Experimental features are made available for testing and review by the community. The APIs of these features should not be considered stable.

Build steps

Building with Autotools

$ ./autogen.sh
$ ./configure
$ make
$ make check  # run the test suite
$ sudo make install  # optional

To compile optional modules (such as Schnorr signatures), you need to run ./configure with additional flags (such as --enable-module-schnorrsig). Run ./configure --help to see the full list of available flags. For experimental modules, you will also need --enable-experimental as well as a flag for each individual module, e.g. --enable-module-musig.

Building with CMake (experimental)

To maintain a pristine source tree, CMake encourages to perform an out-of-source build by using a separate dedicated build tree.

Building on POSIX systems

$ mkdir build && cd build
$ cmake ..
$ cmake --build .
$ ctest  # run the test suite
$ sudo cmake --build . --target install  # optional

To compile optional modules (such as Schnorr signatures), you need to run cmake with additional flags (such as -DSECP256K1_ENABLE_MODULE_SCHNORRSIG=ON). Run cmake .. -LH to see the full list of available flags.

Cross compiling

To alleviate issues with cross compiling, preconfigured toolchain files are available in the cmake directory. For example, to cross compile for Windows:

$ cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/x86_64-w64-mingw32.toolchain.cmake

To cross compile for Android with NDK (using NDK's toolchain file, and assuming the ANDROID_NDK_ROOT environment variable has been set):

$ cmake .. -DCMAKE_TOOLCHAIN_FILE="${ANDROID_NDK_ROOT}/build/cmake/android.toolchain.cmake" -DANDROID_ABI=arm64-v8a -DANDROID_PLATFORM=28

Building on Windows

To build on Windows with Visual Studio, a proper generator must be specified for a new build tree.

The following example assumes using of Visual Studio 2022 and CMake v3.21+.

In "Developer Command Prompt for VS 2022":

>cmake -G "Visual Studio 17 2022" -A x64 -S . -B build
>cmake --build build --config RelWithDebInfo

Usage examples

Usage examples can be found in the examples directory. To compile them you need to configure with --enable-examples.

• ECDSA example
• Schnorr signatures example
• Deriving a shared secret (ECDH) example
• MuSig example

To compile the Schnorr signature, ECDH and MuSig examples, you need to enable the corresponding module by providing a flag to the configure script, for example --enable-module-schnorrsig.

Benchmark

If configured with --enable-benchmark (which is the default), binaries for benchmarking the libsecp256k1-zkp functions will be present in the root directory after the build.

To print the benchmark result to the command line:

$ ./bench_name

To create a CSV file for the benchmark result :

$ ./bench_name | sed '2d;s/ \{1,\}//g' > bench_name.csv

Reporting a vulnerability

See SECURITY.md

Contributing to libsecp256k1

See CONTRIBUTING.md