[![Build Status](https://travis-ci.org/rust-bitcoin/rust-secp256k1.png?branch=master)](https://travis-ci.org/rust-bitcoin/rust-secp256k1)

[Full documentation](https://docs.rs/secp256k1/)

### rust-secp256k1

`rust-secp256k1` is a wrapper around [libsecp256k1](https://github.com/bitcoin-core/secp256k1),
a C library by Pieter Wuille for producing ECDSA signatures using the SECG curve
`secp256k1`. This library
* exposes type-safe Rust bindings for all `libsecp256k1` functions
* implements key generation
* implements deterministic nonce generation via RFC6979
* implements many unit tests, adding to those already present in `libsecp256k1`
* makes no allocations (except in unit tests) for efficiency and use in freestanding implementations

### Contributing

Contributions to this library are welcome. A few guidelines:

* Any breaking changes must have an accompanied entry in CHANGELOG.md
* No new dependencies, please.
* No crypto should be implemented in Rust, with the possible exception of hash functions. Cryptographic contributions should be directed upstream to libsecp256k1.
* This library should always compile with any combination of features on **Rust 1.29**.

## A note on Rust 1.29 support

The build dependency `cc` might require a more recent version of the Rust compiler.
To ensure compilation with Rust 1.29.0, pin its version in your `Cargo.lock`
with `cargo update -p cc --precise 1.0.41`. If you're using `secp256k1` in a library,
to make sure it compiles in CI, you'll need to generate a lockfile first.
Example for Travis CI:
```yml
before_script:
  - if [ "$TRAVIS_RUST_VERSION" == "1.29.0" ]; then
    cargo generate-lockfile --verbose && cargo update -p cc --precise "1.0.41" --verbose;
    fi
```