openmls 0.4.1

This is a WIP Rust implementation of the Messaging Layer Security (MLS) protocol based on draft 12+.
Documentation 
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use openmls_rust_crypto::OpenMlsRustCrypto;

use crate::{
    ciphersuite::{Ciphersuite, Secret},
    test_utils::*,
    versions::ProtocolVersion,
};

#[apply(ciphersuites_and_backends)]
fn secret_init(ciphersuite: Ciphersuite, backend: &impl OpenMlsCryptoProvider) {
    // These two secrets must be incompatible
    let default_secret =
        Secret::random(ciphersuite, backend, None).expect("Not enough randomness.");
    let draft_secret = Secret::random(ciphersuite, backend, ProtocolVersion::Mls10Draft11)
        .expect("Not enough randomness.");

    let derived_default_secret = default_secret.derive_secret(backend, "my_test_label");
    let derived_draft_secret = draft_secret.derive_secret(backend, "my_test_label");
    assert_ne!(derived_default_secret, derived_draft_secret);
}

#[should_panic]
#[apply(ciphersuites_and_backends)]
fn secret_incompatible(ciphersuite: Ciphersuite, backend: &impl OpenMlsCryptoProvider) {
    // These two secrets must be incompatible
    let default_secret =
        Secret::random(ciphersuite, backend, None).expect("Not enough randomness.");
    let draft_secret = Secret::random(ciphersuite, backend, ProtocolVersion::Mls10Draft11)
        .expect("Not enough randomness.");

    // This must panic because the two secrets have incompatible MLS versions.
    let _default_extracted = default_secret.hkdf_extract(backend, &draft_secret);
}