Frosty is a Dart library for generating FROST threshold Schnorr Signatures for secp256k1.
The Dart package is found under frosty and a flutter package is found under
frosty_flutter which includes a flutter build of the underlying Rust library.
The native Rust code is found under frosty_flutter/rust. Scripts for
building the native libraries for Linux and Android are found in scripts,
however frosty_flutter provides automatic builds for Linux, Android, macOS and
iOS.
Please see below for build instructions.
If you are using Flutter, the frosty_flutter package contains support for
automatic builds for different platforms. It requires Rust but otherwise should
not require anything else.
For pure Dart use, it is possible to build a Linux library. Library binaries must be built for the native Rust code.
Podman or Docker can be used to build the binaries. This helps to provide a consistent and reliable build across machines.
The scripts/build-linux.sh script can be executed. An archive of the Linux
library will be produced in platform-build and a copy will be placed in
frosty/build so that the tests can be run in the frosty directory.
During runtime, the shared library is expected to exist within a $PWD/build/
directory or within the library paths.
If you do not wish to use the automatic Android build with frosty_flutter, the
scripts/build-android.sh script can be executed. An archive of the libraries
for the armeabi-v7a and arm64-v8a architectures will be produced in
platform-build as jniLibs.tar.gz. This can be extracted into the
android/app/src/main directory of an Android flutter app.
The scripts/build-apple.sh script will produce a universal framework for macOS
and iOS into platform-build and a dylib will be created in the frosty/build
directory for local testing. This script does not use Podman or Docker and
requires the host machine to have Rust.
Tests require the Linux Rust library in the $PWD/build directory.
If the Rust bindings need to be regenerated, flutter_rust_bridge_codegen generate should be run in the frosty_flutter directory.
The scripts/build-wasm.sh script can be run to update the WASM output and web
bindings for flutter use.