Rust SDK

The Rust account client is in rust/auth.rs in mesgd-sdk. Use it to enroll an account, obtain a session, and manage public keys independently of the PKI layer. The examples use an existing account named alice; passwords and authenticator codes come from the application rather than literals in source.

Support status

The account adapter is available, but a built-in HTTPS transport is still pending. The transport argument in the examples is application code, not a missing SDK constructor.

Completeness position: 7 of 18. Explicit identity instances and tested peer-key cryptography; the account adapter requires an application HTTPS transport. The language matrix explains the ranking criteria and comparable tiers. WSS readiness is listed separately; no SDK currently provides a complete, validated encrypted messaging workflow against this server.

Setup and transport

The crate is mesgd-pki, imported as mesgd_pki. Add it as a path dependency pointing at mesgd-sdk/rust for a local checkout. Cargo.toml declares serde_json, base64, and OpenSSL dependencies. The account module does not choose an HTTP crate.

Implement mesgd_pki::auth::Transport using the application's HTTPS stack. Its send method receives a method, fixed path, optional JSON value, and optional bearer, and returns a status and JSON value. A matching mutable closure also implements the trait. The example accepts an already configured transport.

A custom transport must serialize JSON, attach Authorization: Bearer TOKEN only when a token is supplied, verify the certificate and hostname, reject redirects, and use a finite timeout. Its origin is an HTTPS URL, such as https://mesgd.example.com, rather than a WebSocket URL.

Log in, read keys, and log out

Pass the current authenticator code as a six-digit string, preserving leading zeroes. This example reads the account's published keys and ends the session on its successful path. Applications that retain a session can keep the bearer until logout or expiry instead.

use mesgd_pki::auth::{AuthClient, AuthError, Transport};
use serde_json::Value;

fn read_keys<T: Transport>(transport: T, password: &str, otp: &str)
    -> Result<Value, AuthError>
{
    let mut client = AuthClient::new(transport);
    let session = client.login("alice", password, otp)?;
    let token = session["access_token"].as_str()
        .ok_or(AuthError::Transport)?;
    let keys = client.keys(token);
    let logout = client.logout(token);
    let keys = keys?;
    logout?;
    Ok(keys)
}

Account methods take &mut self and return Result<Value, AuthError>. Errors distinguish invalid input, an HTTP status, and transport failure. PKI::init loads an existing file; use PKI::generate to create one.

Enroll a new account

The following fragment uses an existing client or transport from the example above. Signup returns a pending enrollment. Display qr_png_base64 or otpauth_uri, let the person configure the authenticator, then collect a code to confirm it. These calls are separate application steps, with user interaction between them.

let enrollment = client.signup("alice", "alice@example.com", password, vec![])?;
// Display enrollment, then obtain enrollment_otp from the authenticator.
let enrollment_token = enrollment["enrollment_token"].as_str()
    .ok_or(AuthError::Transport)?;
let session = client.confirm("alice", enrollment_token, enrollment_otp)?;
let recovery_codes = &session["recovery_codes"];

Confirmation returns the first session and eight recovery codes. Display the recovery codes for separate safekeeping. A code accepted for confirmation cannot be reused for login or a key update; wait for a new authenticator step before another operation that consumes a code.

Account operations

A key update takes the session token, current password, a fresh authenticator code, and an array containing only public JWKs. An empty array clears the linked keys. A password reset takes the username, a saved recovery code, a new password, and a fresh authenticator code; success replaces the recovery codes and revokes existing sessions without returning a new session.

The shared authentication reference documents argument order, response fields, and transport behavior. Session refresh is available through the HTTP API but is not wrapped by these seven SDK operations.

Local signing and encryption

This example exercises the local PKI implementation without opening a network connection. It signs a short message, verifies it with the same identity, and encrypts and decrypts it locally. It demonstrates the primitives rather than a complete peer-to-peer exchange.

use mesgd_pki::PKI;

fn local_crypto() -> Result<(), Box<dyn std::error::Error>> {
    let identity = PKI::generate("pki_keys.json")?;
    let signature = identity.sign("hello")?;
    assert!(identity.verify("hello", &signature)?);
    let ciphertext = identity.encrypt("hello")?;
    assert_eq!(identity.decrypt(&ciphertext)?, "hello");
    Ok(())
}

generate creates a new identity and writes its private keys. Use init with an existing file to retain an identity between runs rather than generating a replacement each time.

For a different recipient, use that recipient's public encryption key rather than the local identity's encryption key. Public-key export and interoperability coverage vary by implementation; see Keys and Languages. Private key files are not account credentials and must not be sent to PUT /auth/keys.

Message connections

Account login does not establish a message connection. The current server accepts JSON WebSocket frames and can authenticate an upgrade with a login session or an issued grant token. Login sessions carry identity without path restrictions; grants limit routing to assigned patterns. See WebSocket and Routing.

The encrypted registration handshake in the ping/pong samples is not implemented by the current mesgd listener. Treat those samples as experimental cryptographic examples, with compatibility limits described in Samples.

Validation

From the mesgd-sdk repository root, run the account contract suite for this language:

python3 tests/test_auth.py --language rust

This is an offline request-contract check. Missing toolchains are reported as skips. See Languages for live HTTPS and PKI test coverage.