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//! XX (Noise Protocol) implementation of an Ockam Key Exchanger.
//!
//! This crate contains the key exchange types of the Ockam library and is intended
//! for use by other crates that provide features and add-ons to the main
//! Ockam library.
//!
//! The main Ockam crate re-exports types defined in this crate.
#![deny(
    missing_docs,
    trivial_casts,
    trivial_numeric_casts,
    unsafe_code,
    unused_import_braces,
    unused_qualifications,
    warnings
)]
#![cfg_attr(not(feature = "std"), no_std)]

#[cfg(feature = "std")]
extern crate core;

#[cfg(feature = "alloc")]
#[macro_use]
extern crate alloc;

mod error;

pub use error::*;
use ockam_core::AsyncTryClone;

/// The number of bytes in a SHA256 digest
pub const SHA256_SIZE: usize = 32;
/// The number of bytes in AES-GCM tag
pub const AES_GCM_TAGSIZE: usize = 16;

/// Vault with XX required functionality
pub trait XXVault:
    SecretVault + Hasher + AsymmetricVault + SymmetricVault + AsyncTryClone + Send + Sync + 'static
{
}

impl<D> XXVault for D where
    D: SecretVault
        + Hasher
        + AsymmetricVault
        + SymmetricVault
        + AsyncTryClone
        + Send
        + Sync
        + 'static
{
}

mod initiator;
mod state;
pub use initiator::*;
mod responder;
pub use responder::*;
mod new_key_exchanger;
pub use new_key_exchanger::*;
use ockam_vault_core::{AsymmetricVault, Hasher, SecretVault, SymmetricVault};

#[cfg(test)]
mod tests {
    use super::*;
    use ockam_core::AsyncTryClone;
    use ockam_key_exchange_core::{KeyExchanger, NewKeyExchanger};
    use ockam_vault::SoftwareVault;
    use ockam_vault_core::SecretVault;
    use ockam_vault_sync_core::VaultSync;

    #[allow(non_snake_case)]
    #[test]
    fn full_flow__correct_credentials__keys_should_match() {
        let (mut ctx, mut exec) = ockam_node::start_node();
        exec.execute(async move {
            let mut vault = VaultSync::create(&ctx, SoftwareVault::default())
                .await
                .unwrap();

            let key_exchanger = XXNewKeyExchanger::new(vault.async_try_clone().await.unwrap());

            let mut initiator = key_exchanger.initiator().await.unwrap();
            let mut responder = key_exchanger.responder().await.unwrap();

            loop {
                if !initiator.is_complete().await.unwrap() {
                    let m = initiator.generate_request(&[]).await.unwrap();
                    let _ = responder.handle_response(&m).await.unwrap();
                }

                if !responder.is_complete().await.unwrap() {
                    let m = responder.generate_request(&[]).await.unwrap();
                    let _ = initiator.handle_response(&m).await.unwrap();
                }

                if initiator.is_complete().await.unwrap() && responder.is_complete().await.unwrap()
                {
                    break;
                }
            }

            let initiator = initiator.finalize().await.unwrap();
            let responder = responder.finalize().await.unwrap();

            assert_eq!(initiator.h(), responder.h());

            let s1 = vault.secret_export(&initiator.encrypt_key()).await.unwrap();
            let s2 = vault.secret_export(&responder.decrypt_key()).await.unwrap();

            assert_eq!(s1, s2);

            let s1 = vault.secret_export(&initiator.decrypt_key()).await.unwrap();
            let s2 = vault.secret_export(&responder.encrypt_key()).await.unwrap();

            assert_eq!(s1, s2);

            ctx.stop().await.unwrap();
        })
        .unwrap();
    }
}