starknet-signing-cpp

Overview

What does it do

This C++ library is used to sign requests for authentication and orders sent to linora. The signature is passed with every authertication request and order and proves that whoever sent this it has access to a private key of the account.

Why is it useful

Trading programs written in C++ provide superior performance vs other languages. For that reason most of low latency traders use C++. This library will allow them to integrate with linora and improve quality of liquidity on linora' order books. This in turn will increase trading volume and transactions on linora, StarkNet and Ethereum networks.
Average latencies of signing a linora order using different language libraries:

Language	Average latency milliseconds
Python with C extension	37
Go	1.7
Rust	0.2
C++	0.4

What's inside

C++ library using 3rd party C++ libraries and 3rd party StarkNet Rust library: https://github.com/xJonathanLEI/starknet-rs.

Roadmap

• Extension to Windows OS.
• Replacement of Rust library dependency with native C++ code.
• Implementation of generate_k from rfc6979
• Bug fixes

Prerequisites

• CMake 3.5+ % cmake -version
• C++17 toolchain
• Rust
• Python 3.x
• conan
• Installed nlohmann_json library

Conan setup

In root run

% sudo pip3 install -r requirements.txt

Compilation

1. Init submodule

   git submodule update --init
   

2. Run

   ./build.sh <path>/install/share/cmake/nlohmann_json
   

3. The compiled library resides in

   
   project-root/build/src/libsigner.a
   

Running tests

It`s

After successful compilation executables shall be located in: project-root/build/tests.

• To run gtests:

project-root/build/tests/test

• To run test of client authentication request:

project-root/build/tests/clientTest

• To run cpp wrapper tests

project-root/build/libs/starknet-crypto-ffi/src/cpp-wrapper/tests/cppWrapperTest

Third party dependencies

• keccak sourced from https://github.com/AztecProtocol/barretenberg.git