ed25519-dalek-rustgo
This repository is a demo for rustgo, a technique to directly call Rust code from Go programs with near-zero overhead, meant to replace manually written assembly.
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edwards25519 implements operations on an Edwards curve that is isomorphic to curve25519 by wrapping the excellent pure-Rust curve25519-dalek library.
It exposes a Go interface, and can be imported, used and (cross-)compiled (but not installed) like a normal Go program. Benchmarks show this package to be more than 3 times faster than a pure-Go alternative.
Installation
To install using pre-built artifacts, download a tarball from the Releases page matching your Go version and untar it into $GOPATH. (The _haswell version is about 10% faster, but will only run on Haswell CPUs and newer.)
tar -C$GOPATH -xvf ed25519-dalek-rustgo_go1.8.3.tar.gz
That's it, you're ready to use the github.com/FiloSottile/ed25519-dalek-rustgo/edwards25519 package.
Manual installation
To build from source, you'll need Go, Rust, make and a linker.
Simply run make install from the root of this repository, which must be checked out at the right place in $GOPATH.
Cross-compilation is supported and based on GOOS/GOARCH. You'll need Rust setup and a linker for your target, specified with the LD variable. Set the MUSL environment variable to target x86_64-unknown-linux-musl for linux_amd64.
MUSL=1 GOOS=linux make clean install LD=x86_64-linux-musl-ld
The default RUSTFLAGS will target your native CPU.
Usage
Just what you're used to. Import it, call its functions, go build your program.
Cross-compilation works normally, as long as a .a was installed for the target. Binary distributions currently include darwin_amd64 and linux_amd64 pre-built archives.
The only function currently exposed is multiplication of a scalar by the Curve25519 basepoint into an Edwards compressed point. PRs to add more APIs are welcome.