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 tls_codec::{Deserialize, Serialize};

use crate::{
    group::GroupId,
    messages::{PreSharedKeyProposal, ProtocolVersion, ReInitProposal},
    schedule::psk::{BranchPsk, ExternalPsk, PreSharedKeyId, Psk, PskType, ReinitPsk},
    test_utils::*,
};

/// Test the encoding for PreSharedKeyProposal, that also covers some of the
/// other PSK-related structs
#[apply(backends)]
fn test_pre_shared_key_proposal_codec(backend: &impl OpenMlsCryptoProvider) {
    // ReInit
    let psk = PreSharedKeyId {
        psk_type: PskType::Reinit,
        psk: Psk::Reinit(ReinitPsk {
            psk_group_id: GroupId::random(backend),
            psk_epoch: 1234.into(),
        }),
        psk_nonce: vec![1, 2, 3].into(),
    };
    let orig = PreSharedKeyProposal::new(psk);
    let encoded = orig
        .tls_serialize_detached()
        .expect("An unexpected error occurred.");
    let decoded = PreSharedKeyProposal::tls_deserialize(&mut encoded.as_slice())
        .expect("An unexpected error occurred.");
    assert_eq!(decoded, orig);

    // External
    let psk = PreSharedKeyId {
        psk_type: PskType::External,
        psk: Psk::External(ExternalPsk::new(vec![4, 5, 6])),
        psk_nonce: vec![1, 2, 3].into(),
    };
    let orig = PreSharedKeyProposal::new(psk);
    let encoded = orig
        .tls_serialize_detached()
        .expect("An unexpected error occurred.");
    let decoded = PreSharedKeyProposal::tls_deserialize(&mut encoded.as_slice())
        .expect("An unexpected error occurred.");
    assert_eq!(decoded, orig);

    // Branch
    let psk = PreSharedKeyId {
        psk_type: PskType::Branch,
        psk: Psk::Branch(BranchPsk {
            psk_group_id: GroupId::random(backend),
            psk_epoch: 1234.into(),
        }),
        psk_nonce: vec![1, 2, 3].into(),
    };
    let orig = PreSharedKeyProposal::new(psk);
    let encoded = orig
        .tls_serialize_detached()
        .expect("An unexpected error occurred.");
    let decoded = PreSharedKeyProposal::tls_deserialize(&mut encoded.as_slice())
        .expect("An unexpected error occurred.");
    assert_eq!(decoded, orig);
}
/// Test the encoding for ReInitProposal, that also covers some of the
/// other PSK-related structs
#[apply(ciphersuites_and_backends)]
fn test_reinit_proposal_codec(ciphersuite: Ciphersuite, backend: &impl OpenMlsCryptoProvider) {
    let orig = ReInitProposal {
        group_id: GroupId::random(backend),
        version: ProtocolVersion::default(),
        ciphersuite,
        extensions: vec![].into(),
    };
    let encoded = orig
        .tls_serialize_detached()
        .expect("An unexpected error occurred.");
    let decoded = ReInitProposal::tls_deserialize(&mut encoded.as_slice())
        .expect("An unexpected error occurred.");
    assert_eq!(decoded, orig);
}