// Copyright (c) Facebook, Inc. and its affiliates.
//
// This source code is licensed under the MIT license found in the
// LICENSE file in the root directory of this source tree.

use crate::{
    ciphersuite::CipherSuite,
    errors::*,
    group::Group,
    key_exchange::tripledh::{TripleDH, NONCE_LEN},
    keypair::{Key, KeyPair, SizedBytes, X25519KeyPair},
    opaque::*,
    slow_hash::NoOpHash,
    tests::mock_rng::CycleRng,
};
use curve25519_dalek::edwards::EdwardsPoint;
use generic_array::GenericArray;
use rand_core::{OsRng, RngCore};
use serde_json::Value;
use std::convert::TryFrom;

// Tests
// =====

struct X255193dhNoSlowHash;
impl CipherSuite for X255193dhNoSlowHash {
    type Group = EdwardsPoint;
    type KeyFormat = X25519KeyPair;
    type KeyExchange = TripleDH;
    type Hash = sha2::Sha256;
    type SlowHash = NoOpHash;
}

pub struct TestVectorParameters {
    pub client_s_pk: Vec<u8>,
    pub client_s_sk: Vec<u8>,
    pub client_e_pk: Vec<u8>,
    pub client_e_sk: Vec<u8>,
    pub server_s_pk: Vec<u8>,
    pub server_s_sk: Vec<u8>,
    pub server_e_pk: Vec<u8>,
    pub server_e_sk: Vec<u8>,
    pub id_u: Vec<u8>,
    pub id_s: Vec<u8>,
    pub password: Vec<u8>,
    pub blinding_factor: Vec<u8>,
    pub oprf_key: Vec<u8>,
    pub envelope_nonce: Vec<u8>,
    pub client_nonce: Vec<u8>,
    pub server_nonce: Vec<u8>,
    pub r1: Vec<u8>,
    pub r2: Vec<u8>,
    pub r3: Vec<u8>,
    pub l1: Vec<u8>,
    pub l2: Vec<u8>,
    pub l3: Vec<u8>,
    client_registration_state: Vec<u8>,
    server_registration_state: Vec<u8>,
    client_login_state: Vec<u8>,
    server_login_state: Vec<u8>,
    pub password_file: Vec<u8>,
    pub export_key: Vec<u8>,
    pub shared_secret: Vec<u8>,
}

static TEST_VECTOR: &str = r#"
{
    "client_s_pk": "7489b55c78b380db87d664178e5a020eb2f9bbeac0a44f6fb034ccba8de4a934",
    "client_s_sk": "f0499a6c8bac723debd497b672c2d89ed2d96fd190fce247e0dd3019dce8ec59",
    "client_e_pk": "c87afc8a9dc82c93dc6fa9d27654c6b909de929e542e94a87ffb7b3256190a46",
    "client_e_sk": "107078f8e2ddd88c3d37e611ae932d798403e475f52a6695639999f963063576",
    "server_s_pk": "764f186883a88353586c2427bfbe0ff3e5a0f56af414b0c42a5a300fc426ba4d",
    "server_s_sk": "c089cb11e78ea8923cc25857ba51fd5da820079a9a2b377bc87dcd496b563e5c",
    "server_e_pk": "05d99649994c006a508b996d11a94f52ae68cca44087bdd69602dfceb92d950c",
    "server_e_sk": "70c4df069c1a7b70c16cf6409157674c3f8adfd0919f9dd67a254cf167c7e87f",
    "id_u": "696455",
    "id_s": "696453",
    "password": "70617373776f7264",
    "blinding_factor": "c5629094a160136e99012cf9c8eb19d9d62f87cadf846636bd175064a78b2d00",
    "oprf_key": "f431dcb851f3c8202b9dd1a06d8d32434bbab88de4fdd079452faf2359a8d408",
    "envelope_nonce": "be38985f7e04dab53e0bddf32cc9eeb64d7f072e089650b681ba4bb04bcfaeb2",
    "client_nonce": "0c51879d4ae4cbd047fbf1ba9c7512c25c8d809486f5e6018dff8c525d9f41f1",
    "server_nonce": "c896afa11787f8374bbeb3876151bcf4b75c9511a70be3dddce7606a353f3bc3",
    "r1": "01000027000369645500201d540787a850896d3c7407e5a2c17729772170dae61640872aeca109d64d4581",
    "r2": "02000028002033f9c4bdfe3d2597cbf0c86db2b0b3e81a4400ad4c9618372f6e24d89229d9a4000001010103",
    "r3": "030000aebe38985f7e04dab53e0bddf32cc9eeb64d7f072e089650b681ba4bb04bcfaeb20023441a15c5ccbbf863e0db5e03c6edc63696b05d83a66e4aa3e10aa1320936fe8357bc250023030020764f186883a88353586c2427bfbe0ff3e5a0f56af414b0c42a5a300fc426ba4d00208229fa7e73d11f6935de9d5aae17ab5ec77d6cff8d8456437a8098bb54aa9b9300207489b55c78b380db87d664178e5a020eb2f9bbeac0a44f6fb034ccba8de4a934",
    "l1": "04000027000369645500201d540787a850896d3c7407e5a2c17729772170dae61640872aeca109d64d45810c51879d4ae4cbd047fbf1ba9c7512c25c8d809486f5e6018dff8c525d9f41f1c87afc8a9dc82c93dc6fa9d27654c6b909de929e542e94a87ffb7b3256190a46",
    "l2": "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",
    "l3": "6ba92c16abdd010bc8e9a5175d639512f8b270767d4b7198d03a985935e7da6d",
    "client_registration_state": "00036964550003696453c5629094a160136e99012cf9c8eb19d9d62f87cadf846636bd175064a78b2d0070617373776f7264",
    "client_login_state": "00036964550003696453c5629094a160136e99012cf9c8eb19d9d62f87cadf846636bd175064a78b2d00107078f8e2ddd88c3d37e611ae932d798403e475f52a6695639999f9630635760c51879d4ae4cbd047fbf1ba9c7512c25c8d809486f5e6018dff8c525d9f41f123c1c83fbf2a84c442b079fcacff55b13a4aebf9ba326e992c83b550afbb0c8770617373776f7264",
    "server_registration_state": "f431dcb851f3c8202b9dd1a06d8d32434bbab88de4fdd079452faf2359a8d408",
    "server_login_state": "72486032f6ff6f079144a891fdcb5ca63ede147f327313437c6bf2fd79d08b1faf03840b6c031f7afb66e2740ae064fc140c9aec2ac42295a6d1201d6ad5cdc641d81a7e3805c996ff9fb15fbcd4eddb528a3622f0f4488bca04bace6d740ee3",
    "password_file": "f431dcb851f3c8202b9dd1a06d8d32434bbab88de4fdd079452faf2359a8d4087489b55c78b380db87d664178e5a020eb2f9bbeac0a44f6fb034ccba8de4a934be38985f7e04dab53e0bddf32cc9eeb64d7f072e089650b681ba4bb04bcfaeb20023441a15c5ccbbf863e0db5e03c6edc63696b05d83a66e4aa3e10aa1320936fe8357bc250023030020764f186883a88353586c2427bfbe0ff3e5a0f56af414b0c42a5a300fc426ba4d00208229fa7e73d11f6935de9d5aae17ab5ec77d6cff8d8456437a8098bb54aa9b93",
    "export_key": "c2bc61bafeb9ab541fa362dc154c7a07dab8479e486da2daf9408438d9dc562f",
    "shared_secret": "41d81a7e3805c996ff9fb15fbcd4eddb528a3622f0f4488bca04bace6d740ee3"
}
"#;

fn decode(values: &Value, key: &str) -> Option<Vec<u8>> {
    values[key]
        .as_str()
        .and_then(|s| hex::decode(&s.to_string()).ok())
}

fn populate_test_vectors(values: &Value) -> TestVectorParameters {
    TestVectorParameters {
        client_s_pk: decode(&values, "client_s_pk").unwrap(),
        client_s_sk: decode(&values, "client_s_sk").unwrap(),
        client_e_pk: decode(&values, "client_e_pk").unwrap(),
        client_e_sk: decode(&values, "client_e_sk").unwrap(),
        server_s_pk: decode(&values, "server_s_pk").unwrap(),
        server_s_sk: decode(&values, "server_s_sk").unwrap(),
        server_e_pk: decode(&values, "server_e_pk").unwrap(),
        server_e_sk: decode(&values, "server_e_sk").unwrap(),
        id_u: decode(&values, "id_u").unwrap(),
        id_s: decode(&values, "id_s").unwrap(),
        password: decode(&values, "password").unwrap(),
        blinding_factor: decode(&values, "blinding_factor").unwrap(),
        oprf_key: decode(&values, "oprf_key").unwrap(),
        envelope_nonce: decode(&values, "envelope_nonce").unwrap(),
        client_nonce: decode(&values, "client_nonce").unwrap(),
        server_nonce: decode(&values, "server_nonce").unwrap(),
        r1: decode(&values, "r1").unwrap(),
        r2: decode(&values, "r2").unwrap(),
        r3: decode(&values, "r3").unwrap(),
        l1: decode(&values, "l1").unwrap(),
        l2: decode(&values, "l2").unwrap(),
        l3: decode(&values, "l3").unwrap(),
        client_registration_state: decode(&values, "client_registration_state").unwrap(),
        client_login_state: decode(&values, "client_login_state").unwrap(),
        server_registration_state: decode(&values, "server_registration_state").unwrap(),
        server_login_state: decode(&values, "server_login_state").unwrap(),
        password_file: decode(&values, "password_file").unwrap(),
        export_key: decode(&values, "export_key").unwrap(),
        shared_secret: decode(&values, "shared_secret").unwrap(),
    }
}

fn stringify_test_vectors(p: &TestVectorParameters) -> String {
    let mut s = String::new();
    s.push_str("{\n");
    s.push_str(format!("\"client_s_pk\": \"{}\",\n", hex::encode(&p.client_s_pk)).as_str());
    s.push_str(format!("\"client_s_sk\": \"{}\",\n", hex::encode(&p.client_s_sk)).as_str());
    s.push_str(format!("\"client_e_pk\": \"{}\",\n", hex::encode(&p.client_e_pk)).as_str());
    s.push_str(format!("\"client_e_sk\": \"{}\",\n", hex::encode(&p.client_e_sk)).as_str());
    s.push_str(format!("\"server_s_pk\": \"{}\",\n", hex::encode(&p.server_s_pk)).as_str());
    s.push_str(format!("\"server_s_sk\": \"{}\",\n", hex::encode(&p.server_s_sk)).as_str());
    s.push_str(format!("\"server_e_pk\": \"{}\",\n", hex::encode(&p.server_e_pk)).as_str());
    s.push_str(format!("\"server_e_sk\": \"{}\",\n", hex::encode(&p.server_e_sk)).as_str());
    s.push_str(format!("\"id_u\": \"{}\",\n", hex::encode(&p.id_u)).as_str());
    s.push_str(format!("\"id_s\": \"{}\",\n", hex::encode(&p.id_s)).as_str());
    s.push_str(format!("\"password\": \"{}\",\n", hex::encode(&p.password)).as_str());
    s.push_str(
        format!(
            "\"blinding_factor\": \"{}\",\n",
            hex::encode(&p.blinding_factor)
        )
        .as_str(),
    );
    s.push_str(format!("\"oprf_key\": \"{}\",\n", hex::encode(&p.oprf_key)).as_str());
    s.push_str(
        format!(
            "\"envelope_nonce\": \"{}\",\n",
            hex::encode(&p.envelope_nonce)
        )
        .as_str(),
    );
    s.push_str(format!("\"client_nonce\": \"{}\",\n", hex::encode(&p.client_nonce)).as_str());
    s.push_str(format!("\"server_nonce\": \"{}\",\n", hex::encode(&p.server_nonce)).as_str());
    s.push_str(format!("\"r1\": \"{}\",\n", hex::encode(&p.r1)).as_str());
    s.push_str(format!("\"r2\": \"{}\",\n", hex::encode(&p.r2)).as_str());
    s.push_str(format!("\"r3\": \"{}\",\n", hex::encode(&p.r3)).as_str());
    s.push_str(format!("\"l1\": \"{}\",\n", hex::encode(&p.l1)).as_str());
    s.push_str(format!("\"l2\": \"{}\",\n", hex::encode(&p.l2)).as_str());
    s.push_str(format!("\"l3\": \"{}\",\n", hex::encode(&p.l3)).as_str());
    s.push_str(
        format!(
            "\"client_registration_state\": \"{}\",\n",
            hex::encode(&p.client_registration_state)
        )
        .as_str(),
    );
    s.push_str(
        format!(
            "\"client_login_state\": \"{}\",\n",
            hex::encode(&p.client_login_state)
        )
        .as_str(),
    );
    s.push_str(
        format!(
            "\"server_registration_state\": \"{}\",\n",
            hex::encode(&p.server_registration_state)
        )
        .as_str(),
    );
    s.push_str(
        format!(
            "\"server_login_state\": \"{}\",\n",
            hex::encode(&p.server_login_state)
        )
        .as_str(),
    );
    s.push_str(
        format!(
            "\"password_file\": \"{}\",\n",
            hex::encode(&p.password_file)
        )
        .as_str(),
    );
    s.push_str(format!("\"export_key\": \"{}\",\n", hex::encode(&p.export_key)).as_str());
    s.push_str(format!("\"shared_secret\": \"{}\"\n", hex::encode(&p.shared_secret)).as_str());
    s.push_str("}\n");
    s
}

fn generate_parameters<CS: CipherSuite>() -> TestVectorParameters
where
    // Unsightly constraints due to the (required) use of the SizedBytes
    // instance for KP in ServerRegistration::start. See also the impl
    // Tryfrom<&[u8]> for ServerRegistration (those are the same constraints).
    <<CS::KeyFormat as KeyPair>::Repr as SizedBytes>::Len:
        std::ops::Add<<<CS::KeyFormat as KeyPair>::Repr as SizedBytes>::Len>,
    generic_array::typenum::Sum<
        <<CS::KeyFormat as KeyPair>::Repr as SizedBytes>::Len,
        <<CS::KeyFormat as KeyPair>::Repr as SizedBytes>::Len,
    >: generic_array::ArrayLength<u8>,
{
    let mut rng = OsRng;

    // Inputs
    let server_s_kp = CS::generate_random_keypair(&mut rng).unwrap();
    let server_e_kp = CS::generate_random_keypair(&mut rng).unwrap();
    let client_s_kp = CS::generate_random_keypair(&mut rng).unwrap();
    let client_e_kp = CS::generate_random_keypair(&mut rng).unwrap();
    let id_u = b"idU";
    let id_s = b"idS";
    let password = b"password";
    let mut blinding_factor_raw = [0u8; 64];
    rng.fill_bytes(&mut blinding_factor_raw);
    let mut oprf_key_raw = [0u8; 32];
    rng.fill_bytes(&mut oprf_key_raw);
    let mut envelope_nonce = [0u8; 32];
    rng.fill_bytes(&mut envelope_nonce);
    let mut client_nonce = [0u8; NONCE_LEN];
    rng.fill_bytes(&mut client_nonce);
    let mut server_nonce = [0u8; NONCE_LEN];
    rng.fill_bytes(&mut server_nonce);

    let mut blinding_factor_registration_rng = CycleRng::new(blinding_factor_raw.to_vec());
    let (r1, client_registration) = ClientRegistration::<CS>::start_with_user_and_server_name(
        id_u,
        id_s,
        password,
        &mut blinding_factor_registration_rng,
    )
    .unwrap();
    let r1_bytes = r1.serialize().to_vec();
    let blinding_factor_bytes =
        CS::Group::scalar_as_bytes(&client_registration.token.blind).clone();
    let client_registration_state = client_registration.to_bytes().to_vec();

    let mut oprf_key_rng = CycleRng::new(oprf_key_raw.to_vec());
    let (r2, server_registration) = ServerRegistration::<CS>::start(r1, &mut oprf_key_rng).unwrap();
    let r2_bytes = r2.serialize().to_vec();
    let oprf_key_bytes = CS::Group::scalar_as_bytes(&server_registration.oprf_key).clone();
    let server_registration_state = server_registration.to_bytes().to_vec();

    let mut client_s_sk_and_nonce: Vec<u8> = Vec::new();
    client_s_sk_and_nonce.extend_from_slice(&client_s_kp.private().to_arr());
    client_s_sk_and_nonce.extend_from_slice(&envelope_nonce);

    let mut finish_registration_rng = CycleRng::new(client_s_sk_and_nonce);
    let (r3, export_key_registration) = client_registration
        .finish(r2, server_s_kp.public(), &mut finish_registration_rng)
        .unwrap();
    let r3_bytes = r3.serialize().to_vec();

    let password_file = server_registration.finish(r3).unwrap();
    let password_file_bytes = password_file.to_bytes();

    let mut client_login_start: Vec<u8> = Vec::new();
    client_login_start.extend_from_slice(&blinding_factor_raw);
    client_login_start.extend_from_slice(&client_e_kp.private().to_arr());
    client_login_start.extend_from_slice(&client_nonce);

    let mut client_login_start_rng = CycleRng::new(client_login_start);
    let (l1, client_login) = ClientLogin::<CS>::start_with_user_and_server_name(
        id_u,
        id_s,
        password,
        &mut client_login_start_rng,
    )
    .unwrap();
    let l1_bytes = l1.serialize().to_vec();
    let client_login_state = client_login.to_bytes().to_vec();

    let mut server_e_sk_rng = CycleRng::new(server_e_kp.private().to_arr().to_vec());
    let (l2, server_login) = ServerLogin::<CS>::start(
        password_file,
        server_s_kp.private(),
        l1,
        &mut server_e_sk_rng,
    )
    .unwrap();
    let l2_bytes = l2.serialize().to_vec();
    let server_login_state = server_login.to_bytes().to_vec();

    let mut client_e_sk_rng = CycleRng::new(client_e_kp.private().to_arr().to_vec());
    let (l3, client_shared_secret, _export_key_login) = client_login
        .finish(l2, server_s_kp.public(), &mut client_e_sk_rng)
        .unwrap();
    let l3_bytes = l3.to_bytes().to_vec();

    TestVectorParameters {
        client_s_pk: client_s_kp.public().to_arr().to_vec(),
        client_s_sk: client_s_kp.private().to_arr().to_vec(),
        client_e_pk: client_e_kp.public().to_arr().to_vec(),
        client_e_sk: client_e_kp.private().to_arr().to_vec(),
        server_s_pk: server_s_kp.public().to_arr().to_vec(),
        server_s_sk: server_s_kp.private().to_arr().to_vec(),
        server_e_pk: server_e_kp.public().to_arr().to_vec(),
        server_e_sk: server_e_kp.private().to_arr().to_vec(),
        id_u: id_u.to_vec(),
        id_s: id_s.to_vec(),
        password: password.to_vec(),
        blinding_factor: blinding_factor_bytes.to_vec(),
        oprf_key: oprf_key_bytes.to_vec(),
        envelope_nonce: envelope_nonce.to_vec(),
        client_nonce: client_nonce.to_vec(),
        server_nonce: server_nonce.to_vec(),
        r1: r1_bytes,
        r2: r2_bytes,
        r3: r3_bytes,
        l1: l1_bytes,
        l2: l2_bytes,
        l3: l3_bytes,
        password_file: password_file_bytes,
        client_registration_state,
        server_registration_state,
        client_login_state,
        server_login_state,
        shared_secret: client_shared_secret,
        export_key: export_key_registration.to_vec(),
    }
}

#[test]
fn generate_test_vectors() {
    let parameters = generate_parameters::<X255193dhNoSlowHash>();
    println!("{}", stringify_test_vectors(&parameters));
}

// For fixing the blinding factor
fn postprocess_blinding_factor<G: Group>(_: G::Scalar) -> G::Scalar {
    let parameters = populate_test_vectors(&serde_json::from_str(TEST_VECTOR).unwrap());
    G::from_scalar_slice(GenericArray::from_slice(&parameters.blinding_factor[..])).unwrap()
}

#[test]
fn test_r1() -> Result<(), PakeError> {
    let parameters = populate_test_vectors(&serde_json::from_str(TEST_VECTOR).unwrap());
    let mut rng = OsRng;
    let (r1, client_registration) = ClientRegistration::<X255193dhNoSlowHash>::start_with_user_and_server_name_and_postprocessing(
        &parameters.id_u,
        &parameters.id_s,
        &parameters.password,
        &mut rng,
        postprocess_blinding_factor::<<X255193dhNoSlowHash as CipherSuite>::Group>,
    )
    .unwrap();
    assert_eq!(hex::encode(&parameters.r1), hex::encode(r1.serialize()));
    assert_eq!(
        hex::encode(&parameters.client_registration_state),
        hex::encode(client_registration.to_bytes())
    );
    Ok(())
}

#[test]
fn test_r2() -> Result<(), PakeError> {
    let parameters = populate_test_vectors(&serde_json::from_str(TEST_VECTOR).unwrap());
    let mut oprf_key_rng = CycleRng::new(parameters.oprf_key);
    let (r2, server_registration) = ServerRegistration::<X255193dhNoSlowHash>::start(
        RegisterFirstMessage::deserialize(&parameters.r1[..]).unwrap(),
        &mut oprf_key_rng,
    )
    .unwrap();
    assert_eq!(hex::encode(parameters.r2), hex::encode(r2.serialize()));
    assert_eq!(
        hex::encode(&parameters.server_registration_state),
        hex::encode(server_registration.to_bytes())
    );
    Ok(())
}

#[test]
fn test_r3() -> Result<(), PakeError> {
    let parameters = populate_test_vectors(&serde_json::from_str(TEST_VECTOR).unwrap());

    let client_s_sk_and_nonce: Vec<u8> =
        [parameters.client_s_sk, parameters.envelope_nonce].concat();
    let mut finish_registration_rng = CycleRng::new(client_s_sk_and_nonce);
    let (r3, export_key_registration) = ClientRegistration::<X255193dhNoSlowHash>::try_from(
        &parameters.client_registration_state[..],
    )
    .unwrap()
    .finish(
        RegisterSecondMessage::deserialize(&parameters.r2[..]).unwrap(),
        &Key::try_from(&parameters.server_s_pk[..]).unwrap(),
        &mut finish_registration_rng,
    )
    .unwrap();

    assert_eq!(hex::encode(parameters.r3), hex::encode(r3.serialize()));
    assert_eq!(
        hex::encode(parameters.export_key),
        hex::encode(export_key_registration.to_vec())
    );

    Ok(())
}

#[test]
fn test_password_file() -> Result<(), PakeError> {
    let parameters = populate_test_vectors(&serde_json::from_str(TEST_VECTOR).unwrap());

    let server_registration = ServerRegistration::<X255193dhNoSlowHash>::try_from(
        &parameters.server_registration_state[..],
    )
    .unwrap();
    let password_file = server_registration
        .finish(RegisterThirdMessage::deserialize(&parameters.r3[..]).unwrap())
        .unwrap();

    assert_eq!(
        hex::encode(parameters.password_file),
        hex::encode(password_file.to_bytes())
    );
    Ok(())
}

#[test]
fn test_l1() -> Result<(), PakeError> {
    let parameters = populate_test_vectors(&serde_json::from_str(TEST_VECTOR).unwrap());

    let client_login_start = [
        vec![0u8; 64], // FIXME: don't hardcode this
        parameters.client_e_sk,
        parameters.client_nonce,
    ]
    .concat();
    let mut client_login_start_rng = CycleRng::new(client_login_start);
    let (l1, client_login) =
        ClientLogin::<X255193dhNoSlowHash>::start_with_user_and_server_name_and_postprocessing(
            &parameters.id_u,
            &parameters.id_s,
            &parameters.password,
            &mut client_login_start_rng,
            postprocess_blinding_factor::<<X255193dhNoSlowHash as CipherSuite>::Group>,
        )
        .unwrap();
    assert_eq!(hex::encode(&parameters.l1), hex::encode(l1.serialize()));
    assert_eq!(
        hex::encode(&parameters.client_login_state),
        hex::encode(client_login.to_bytes())
    );
    Ok(())
}

#[test]
fn test_l2() -> Result<(), PakeError> {
    let parameters = populate_test_vectors(&serde_json::from_str(TEST_VECTOR).unwrap());

    let mut server_e_sk_rng = CycleRng::new(parameters.server_e_sk);
    let (l2, server_login) = ServerLogin::<X255193dhNoSlowHash>::start(
        ServerRegistration::try_from(&parameters.password_file[..]).unwrap(),
        &Key::try_from(&parameters.server_s_sk[..]).unwrap(),
        LoginFirstMessage::<X255193dhNoSlowHash>::deserialize(&parameters.l1[..]).unwrap(),
        &mut server_e_sk_rng,
    )
    .unwrap();

    assert_eq!(hex::encode(&parameters.l2), hex::encode(l2.serialize()));
    assert_eq!(
        hex::encode(&parameters.server_login_state),
        hex::encode(server_login.to_bytes())
    );
    Ok(())
}

#[test]
fn test_l3() -> Result<(), PakeError> {
    let parameters = populate_test_vectors(&serde_json::from_str(TEST_VECTOR).unwrap());

    let mut client_e_sk_rng = CycleRng::new(parameters.client_e_sk.to_vec());
    let (l3, shared_secret, export_key_login) =
        ClientLogin::<X255193dhNoSlowHash>::try_from(&parameters.client_login_state[..])
            .unwrap()
            .finish(
                LoginSecondMessage::<X255193dhNoSlowHash>::deserialize(&parameters.l2[..]).unwrap(),
                &Key::try_from(&parameters.server_s_pk[..])?,
                &mut client_e_sk_rng,
            )
            .unwrap();

    assert_eq!(
        hex::encode(&parameters.shared_secret),
        hex::encode(&shared_secret)
    );
    assert_eq!(hex::encode(&parameters.l3), hex::encode(l3.to_bytes()));
    assert_eq!(
        hex::encode(&parameters.export_key),
        hex::encode(export_key_login)
    );

    Ok(())
}

#[test]
fn test_server_login_finish() -> Result<(), ProtocolError> {
    let parameters = populate_test_vectors(&serde_json::from_str(TEST_VECTOR).unwrap());

    let shared_secret =
        ServerLogin::<X255193dhNoSlowHash>::try_from(&parameters.server_login_state[..])
            .unwrap()
            .finish(LoginThirdMessage::try_from(&parameters.l3[..])?)
            .unwrap();

    assert_eq!(
        hex::encode(parameters.shared_secret),
        hex::encode(shared_secret)
    );

    Ok(())
}

fn test_complete_flow(
    registration_password: &[u8],
    login_password: &[u8],
) -> Result<(), ProtocolError> {
    let mut client_rng = OsRng;
    let mut server_rng = OsRng;
    let server_kp = X255193dhNoSlowHash::generate_random_keypair(&mut server_rng)?;
    let (register_m1, client_state) =
        ClientRegistration::<X255193dhNoSlowHash>::start(registration_password, &mut client_rng)?;
    let (register_m2, server_state) =
        ServerRegistration::<X255193dhNoSlowHash>::start(register_m1, &mut server_rng)?;
    let (register_m3, registration_export_key) =
        client_state.finish(register_m2, server_kp.public(), &mut client_rng)?;
    let p_file = server_state.finish(register_m3)?;
    let (login_m1, client_login_state) =
        ClientLogin::<X255193dhNoSlowHash>::start(login_password, &mut client_rng)?;
    let (login_m2, server_login_state) = ServerLogin::<X255193dhNoSlowHash>::start(
        p_file,
        &server_kp.private(),
        login_m1,
        &mut server_rng,
    )?;

    let client_login_result =
        client_login_state.finish(login_m2, &server_kp.public(), &mut client_rng);

    if hex::encode(registration_password) == hex::encode(login_password) {
        let (login_m3, client_shared_secret, login_export_key) = client_login_result?;
        let server_shared_secret = server_login_state.finish(login_m3)?;

        assert_eq!(
            hex::encode(server_shared_secret),
            hex::encode(client_shared_secret)
        );
        assert_eq!(
            hex::encode(registration_export_key),
            hex::encode(login_export_key)
        );
    } else {
        let res = matches!(
            client_login_result,
            Err(ProtocolError::VerificationError(
                PakeError::InvalidLoginError
            ))
        );
        assert!(res);
    }

    Ok(())
}

#[test]
fn test_complete_flow_success() -> Result<(), ProtocolError> {
    test_complete_flow(b"good password", b"good password")
}

#[test]
fn test_complete_flow_fail() -> Result<(), ProtocolError> {
    test_complete_flow(b"good password", b"bad password")
}