saltyrtc-client 0.6.0

Asynchronous SaltyRTC client implementation for Rust 1.26+.


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Asynchronous SaltyRTC client implementation for Rust 1.26+.

SaltyRTC is an end-to-end encrypted signalling protocol. It offers to freely choose from a range of signalling tasks, such as setting up a WebRTC or ORTC peer-to-peer connection, or using the WebSocket based signaling server as a relay. SaltyRTC is completely open to new and custom signalling tasks for everything feasible.




The integration tests currently expect a SaltyRTC Server instance to run on localhost:8765.

First, create a test certificate for localhost.

openssl req \
   -newkey rsa:1024 \
   -x509 \
   -nodes \
   -keyout saltyrtc.key \
   -new \
   -out saltyrtc.crt \
   -subj /CN=localhost \
   -reqexts SAN \
   -extensions SAN \
   -config <(cat /etc/ssl/openssl.cnf \
     <(printf '[SAN]\nsubjectAltName=DNS:localhost')) \
   -sha256 \
   -days 1825

Create a Python virtualenv with dependencies:

python3 -m virtualenv venv
venv/bin/pip install saltyrtc.server[logging]

Finally, start the server with the following test permanent key:

export SALTYRTC_SERVER_PERMANENT_KEY=0919b266ce1855419e4066fc076b39855e728768e3afa773105edd2e37037c20 # Public: 09a59a5fa6b45cb07638a3a6e347ce563a948b756fd22f9527465f7c79c2a864
venv/bin/saltyrtc-server -v 5 serve -p 8765 \
    -sc saltyrtc.crt -sk saltyrtc.key \

Before you run the client tests, symlink the saltyrtc.crt file into your saltyrtc-client-rs directory.

Unit Tests

To run the testsuite:

cargo test

Fuzz Testing

To run fuzz tests, first install cargo-fuzz:

cargo install cargo-fuzz

Then run the fuzzer against a target:

cargo +nightly fuzz run <target>

You can list all targets with cargo fuzz list.


To run clippy lints, first get the latest clippy version:

$ rustup update
$ rustup install nightly
$ rustup component add clippy-preview --toolchain=nightly

Then run clippy through nightly cargo:

$ cargo +nightly clippy

Example Client

There is an example chat client at examples/chat/ You can invoke it both as initiator or responder.

If you start the chat as initiator, the signaling path and auth token will be randomly generated and printed:

$ cargo run --example chat -- initiator
INFO:saltyrtc_client::crypto: Generating new key pair
INFO:saltyrtc_client::crypto: Generating new auth token

Connecting as Initiator

Signaling path: f637d7fff53defe8db111b17b2c445f7888a83c13dc40d7ff8449f700910f01f
Auth token: 0e94b54a49e4ec7f4398ec9bec5d4359cca810f7eca31704e6c0afadd54a7818

To connect with a peer:
cargo run --example chat -- responder \
    --path f637d7fff53defe8db111b17b2c445f7888a83c13dc40d7ff8449f700910f01f \
    --auth-token 0e94b54a49e4ec7f4398ec9bec5d4359cca810f7eca31704e6c0afadd54a7818

INFO:saltyrtc_client: Connected to server as Initiator

Simply copy that command in the second half of the output to another terminal to connect to the initiator with a responder.

To see all options, use cargo run --example chat -- initiator --help and cargo run --example chat -- responder --help.

The chat example will log to a file called chat.<role>.log.

Note: The tests currently expect a SaltyRTC Server instance to run on localhost:8765.

Msgpack Debugging

If you enable the msgpack-debugging compile flag, you'll get direct msgpack analysis URLs for all decoded messages in your TRACE level logs.

cargo build --features 'msgpack-debugging'

You can customize that URL prefix at compile time using the MSGPACK_DEBUG_URL env var. This is the default URL:


Release Signatures

Release commits and tags are signed with the Threema signing key (E7ADD9914E260E8B35DFB50665FDE935573ACDA6).


You can find C FFI bindings in the ffi subdirectory of this source repository.

Note: The FFI bindings are currently incomplete and blocked by rust-lang/rust#36342.


Licensed under either of


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.