#libsodium #nacl #encryption-decryption #networking #crypto

no-std kuska-sodiumoxide

Fast cryptographic library for Rust (bindings to libsodium), with conversion from ed25519 to curve25519

1 unstable release

Uses old Rust 2015

0.2.5-0 Dec 4, 2020

#620 in Cryptography

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523 downloads per month
Used in 14 crates (7 directly)


6.5K SLoC


Forked from sodiumoxide

Changelog from the fork:

  • Add conversion from ed25519 to curve25519

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NaCl (pronounced "salt") is a new easy-to-use high-speed software library for network communication, encryption, decryption, signatures, etc. NaCl's goal is to provide all of the core operations needed to build higher-level cryptographic tools. Of course, other libraries already exist for these core operations. NaCl advances the state of the art by improving security, by improving usability, and by improving speed.

Sodium is a portable, cross-compilable, installable, packageable fork of NaCl (based on the latest released upstream version nacl-20110221), with a compatible API.

This package aims to provide a type-safe and efficient Rust binding that's just as easy to use. Rust >= 1.36.0 is required because of mem::MaybeUninit.

Basic usage


cargo build


cargo test


cargo doc

Documentation will be generated in target/doc/...

Most documentation is taken from NaCl, with minor modification where the API differs between the C and Rust versions.


C compiler (cc, clang, ...) must be installed in order to build libsodium from source.

Extended usage

This project downloads and builds libsodium by default, favouring a statically-built, fixed version of the native library.

Although it is highly recommended to use the default way with the pinned version, there are several ways you may want to use this crate:

  • link it against the library installed on your system
  • link it against a precompiled library that you built on your own

You can do this by setting environment variables.

Name Description Example value Notes
SODIUM_LIB_DIR Where to find a precompiled library /usr/lib/x86_64-linux-gnu/ The value should be set to the directory containing .so,.a,.la,.dll or .lib
SODIUM_SHARED Tell rustc to link the library dynamically 1 Works only with SODIUM_LIB_DIR. We check only the presence
SODIUM_USE_PKG_CONFIG Tell build.rs to find system library using pkg-config or vcpkg 1 We check only the presence
SODIUM_DISABLE_PIE Build with --disable-pie 1 Certain situations may require building libsodium configured with --disable-pie. Useful for !Windows only and when building libsodium from source. We check only the presence
VCPKGRS_DYNAMIC Tell vcpkg to find libsodium 1 Usefull for Windows only with SODIUM_USE_PKG_CONFIG. More info: https://docs.rs/vcpkg/

Examples on *nix

Using pkg-config

(Ubuntu: apt install pkg-config, OSX: brew install pkg-config, ...)

cargo build

Using precompiled library

See https://download.libsodium.org/doc/installation.

export SODIUM_LIB_DIR=/home/user/libsodium-1.0.18/release/lib/
cargo build

Examples on Windows

Using vcpkg

See https://github.com/Microsoft/vcpkg.

C:\Users\user\dev\vcpkg\vcpkg.exe install libsodium --triplet x64-windows
cargo build

Optional features

Several optional features are available:

  • std (default: enabled). When this feature is disabled, sodiumoxide builds using #![no_std]. Some functionality may be lost. Requires a nightly build of Rust.

  • serde (default: enabled). Allows serialization and deserialization of keys, authentication tags, etc. using the serde library.

  • benchmarks (default: disabled). Compile benchmark tests. Requires a nightly build of Rust.


Cross-Compiling for armv7-unknown-linux-gnueabihf

  1. Install dependencies and toolchain:
sudo apt update
sudo apt install build-essential gcc-arm-linux-gnueabihf libc6-armhf-cross libc6-dev-armhf-cross -y
rustup target add armv7-unknown-linux-gnueabihf
  1. Add the following to a .cargo/config file:
linker = "arm-linux-gnueabihf-gcc"
  1. Build by running:
cargo build --release --target armv7-unknown-linux-gnueabihf

Cross-Compiling for armv7-unknown-linux-musleabihf via docker

  1. cargo.config:
linker = "arm-buildroot-linux-musleabihf-gcc"
  1. Dockerfile:
FROM rust:1.30.1

ENV TARGET="armv7-unknown-linux-musleabihf"

ARG TOOLCHAIN_ARM7="armv7-eabihf--musl--stable-2018.02-2"
ARG TC_ARM7_URL="https://toolchains.bootlin.com/downloads/releases/toolchains/armv7-eabihf/tarballs/${TOOLCHAIN_ARM7}.tar.bz2"

RUN rustup target add ${TARGET}
COPY cargo.config "${CARGO_HOME}/config"

RUN curl -o- ${TC_ARM7_URL} | tar -xjf -

ENV CC_armv7_unknown_linux_musleabihf=arm-buildroot-linux-musleabihf-gcc
ENV CXX_armv7_unknown_linux_musleabihf=arm-buildroot-linux-musleabihf-g++
ENV LD_armv7_unknown_linux_musleabihf=arm-buildroot-linux-musleabihf-ld

RUN git clone https://github.com/sodiumoxide/sodiumoxide

WORKDIR /work/sodiumoxide
RUN cargo build --target=${TARGET}

Cross-Compiling for 32-bit Linux

  1. Install dependencies and toolchain:
sudo apt update
sudo apt install build-essential gcc-multilib -y
rustup target add i686-unknown-linux-gnu
  1. Build by running:
cargo build --release --target i686-unknown-linux-gnu



Platform Compatibiility

Sodiumoxide has been tested on:

  • Linux: Yes
  • Windows: Yes (MSVC)
  • Mac OS: Yes
  • Android: TODO

Join in

File bugs in the issue tracker

Master git repository

git clone https://github.com/sodiumoxide/sodiumoxide.git


Licensed under either of

at your option.


Go through the CONTRIBUTING.md document to know more about how to contribute to this project.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

Code of Conduct

We believe in creating an enabling community for developers and have laid out a general code of conduct. Please read and adopt it to help us achieve and maintain the desired community standards.


~71K SLoC