opaque-vx/src/tests/full_test.rs

// 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.

#![allow(unsafe_code)]

use crate::{
    ciphersuite::CipherSuite,
    errors::*,
    group::Group,
    key_exchange::tripledh::{NonceLen, TripleDH},
    keypair::KeyPair,
    opaque::*,
    slow_hash::NoOpHash,
    tests::mock_rng::CycleRng,
    *,
};
use curve25519_dalek::{ristretto::RistrettoPoint, traits::Identity};
use generic_array::typenum::Unsigned;
use generic_bytes::SizedBytes;
use rand::{rngs::OsRng, RngCore};
use serde_json::Value;
use std::slice::from_raw_parts;
use zeroize::Zeroize;

// Tests
// =====

struct RistrettoSha5123dhNoSlowHash;
impl CipherSuite for RistrettoSha5123dhNoSlowHash {
    type Group = RistrettoPoint;
    type KeyExchange = TripleDH;
    type Hash = sha2::Sha512;
    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 credential_identifier: Vec<u8>,
    pub id_u: Vec<u8>,
    pub id_s: Vec<u8>,
    pub password: Vec<u8>,
    pub blinding_factor: Vec<u8>,
    pub oprf_seed: Vec<u8>,
    pub masking_nonce: Vec<u8>,
    pub envelope_nonce: Vec<u8>,
    pub client_nonce: Vec<u8>,
    pub server_nonce: Vec<u8>,
    pub info1: Vec<u8>,
    pub einfo2: Vec<u8>,
    pub registration_request: Vec<u8>,
    pub registration_response: Vec<u8>,
    pub registration_upload: Vec<u8>,
    pub credential_request: Vec<u8>,
    pub credential_response: Vec<u8>,
    pub credential_finalization: Vec<u8>,
    client_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 session_key: Vec<u8>,
}

static STR_PASSWORD: &str = "password";
static STR_CREDENTIAL_IDENTIFIER: &str = "credential_identifier";

static TEST_VECTOR: &str = r#"
{
    "client_s_pk": "e6201a178ea486df66929dc15e6b7cf522a02c4ff05afdfe221bbda08f9c5142",
    "client_s_sk": "901f0363ae5b8606740ad0f4849c3f993743d3b1750244c27aa8a53035b42306",
    "client_e_pk": "823dc5bf4e3479cf1be9cf2f9fe08f31a5171eb4ef012747b16364f4485e0022",
    "client_e_sk": "288cece1cfbca7441b35fa4f6a1f4291855835e623c4874edefd735e507c3f0f",
    "server_s_pk": "c44776fd33a5fb022bf6e26c4a5cb2c1ddbb785bd5822324df8eca6d80c1d279",
    "server_s_sk": "5f1c3382a1cc430beeb9bdd044d4453d930fac8fe0d6bb65740b6baca208aa01",
    "server_e_pk": "987fcf872beaf9547adbc66a63481e0f315960836d46956af2b1eb2608142f2e",
    "server_e_sk": "a5d8174ade9f423a18438af605ee5b11047cf9973c21fffefcd336f690dd6103",
    "credential_identifier": "637265644964656e746966696572",
    "id_u": "696455",
    "id_s": "696453",
    "password": "70617373776f7264",
    "blinding_factor": "ac66fda6a29b52b1c719453adea5370852f906448609601e7da7892c29017b0b",
    "oprf_seed": "c682275f90adc465ff551a82e54b6e16bd2e49cda05f7c6e6988a269b43a10f824ae31e90c8f8bbbb8cc85f552c0809acab37169332f68351dc7edc575d524f3",
    "masking_nonce": "596b51d2a8a4485ae8d506684942cc2be327b72bac3ccf9864376264b2f5c5dbc5283e39cde28751430c6ab072c7c769c481ef61999488d740203a0b3dbce92d",
    "envelope_nonce": "9b33bc17a2daa8346449bffe8c479202237a0e074ba82b88b6c4d122b22edac7",
    "client_nonce": "a854353a0d88014af9eda6cb7ee3aff7d12fd4174c05221f3300d6ae12561ac0",
    "server_nonce": "949f7773f95493a238f20a2212924108c6492d9eff5e1151b082c869496d1a7c",
    "info1": "696e666f31",
    "einfo2": "65696e666f32",
    "registration_request": "3a5d9fb60e6e91e97da6ca425a7ae8c5defce2ac0c6d89a8189f42f928fa3f04",
    "registration_response": "145476844f947d9b639540c66045fc0e9c755d7a03c10ed618135fcd53cbdf30c44776fd33a5fb022bf6e26c4a5cb2c1ddbb785bd5822324df8eca6d80c1d279",
    "registration_upload": "e6201a178ea486df66929dc15e6b7cf522a02c4ff05afdfe221bbda08f9c514276430085ed2a1f6f9ec49e0ee31f886c806ef1a15b07b0e243a736f38cfed069f97788f2843fc74b8dd6906186af8b77503a5e7932b22c0b772741a475352581029b33bc17a2daa8346449bffe8c479202237a0e074ba82b88b6c4d122b22edac7f32699e8be005286b985ec51d2b37212b04ccfc566cdd38a941177c31cae8158949c584667bf6bec49701e2ee9ac080d51919607993e31e9abf6a31368072e293011a8fce6781db258f1ccdff6b603eed9f405891d72c6e00145d8939ed226ad",
    "credential_request": "3a5d9fb60e6e91e97da6ca425a7ae8c5defce2ac0c6d89a8189f42f928fa3f04a854353a0d88014af9eda6cb7ee3aff7d12fd4174c05221f3300d6ae12561ac00005696e666f31823dc5bf4e3479cf1be9cf2f9fe08f31a5171eb4ef012747b16364f4485e0022",
    "credential_response": "145476844f947d9b639540c66045fc0e9c755d7a03c10ed618135fcd53cbdf30596b51d2a8a4485ae8d506684942cc2be327b72bac3ccf9864376264b2f5c5dba3f796185711239a9e6ef70e66331a52aaaa93629d44987f10a4374ac6a91ab27779da2bf6b2fe37bb9defb73c1a25fdfe8eb06d55d1e40588173b52d075853c57a919f0e088fbdbefa58659a011384145667a12c0ee7474d8f72e86ea52ed1de3617be02b90a90da1b7dd5d5f606da651ea97ceee7a00eb0d56ef76e587921d0a79ed45e37258a7933a31e0d378be00cbcfa1096b62feadbdf9612a33183909aea5d8174ade9f423a18438af605ee5b11047cf9973c21fffefcd336f690dd6103fca1950aac58db4be36a8902ef986dccf93ac6d8ac3203fb5ab2bed06996f27d0006d61f243b55af0cc2a44b7c0f3e060a9091b166cdf4dc3a1017aefd9c419462246f8b4998a853495fb13ebada79f98807d804189e03055047cbf7cf8374924aa137840342e566",
    "credential_finalization": "716d4d7cb3090d6897cd01a693df9f8254b910c75a872f62dc5e08f5c23af724c3d499d0d0e8a888ab4ea3fc1eefb870ab64f0513a978a97dc0e99cd47d05142",
    "client_registration_state": "ac66fda6a29b52b1c719453adea5370852f906448609601e7da7892c29017b0b70617373776f7264",
    "client_login_state": "ac66fda6a29b52b1c719453adea5370852f906448609601e7da7892c29017b0b00673a5d9fb60e6e91e97da6ca425a7ae8c5defce2ac0c6d89a8189f42f928fa3f04a854353a0d88014af9eda6cb7ee3aff7d12fd4174c05221f3300d6ae12561ac00005696e666f31823dc5bf4e3479cf1be9cf2f9fe08f31a5171eb4ef012747b16364f4485e00220040288cece1cfbca7441b35fa4f6a1f4291855835e623c4874edefd735e507c3f0fa854353a0d88014af9eda6cb7ee3aff7d12fd4174c05221f3300d6ae12561ac070617373776f7264",
    "server_login_state": "20508608406858c2038cd6ceef7ef4363648b341576b89f0fbf1c5dd262efade90e16a1cc74f73971fc7c37a0fca8209bf13b0015fefe3e32637d2e951b8500282a29681b6264fa2dd4c3b88cd7d654bdc8e8fb50ed6d78869b403978a1dd05a2c0c602037c1eba611ea2780c5c9ea68a620440adc9ec828e203590420207ad5396a1ffedeb4048f38e8197866c256dd034d3481615fa7f269a3512c99e461e21e8e1be737f7064ed8881205d9271c2c01453eef262140e0561fb64499abe863",
    "password_file": "e6201a178ea486df66929dc15e6b7cf522a02c4ff05afdfe221bbda08f9c514276430085ed2a1f6f9ec49e0ee31f886c806ef1a15b07b0e243a736f38cfed069f97788f2843fc74b8dd6906186af8b77503a5e7932b22c0b772741a475352581029b33bc17a2daa8346449bffe8c479202237a0e074ba82b88b6c4d122b22edac7f32699e8be005286b985ec51d2b37212b04ccfc566cdd38a941177c31cae8158949c584667bf6bec49701e2ee9ac080d51919607993e31e9abf6a31368072e293011a8fce6781db258f1ccdff6b603eed9f405891d72c6e00145d8939ed226ad",
    "export_key": "b01eea8b84b9fa10a179d8002cc782d69cc82c9c02c19200322457126624b24cf981c99257ec09b2d738b7a7a474b50149c8c855e63f2ba7aa0cfe4493334742",
    "session_key": "396a1ffedeb4048f38e8197866c256dd034d3481615fa7f269a3512c99e461e21e8e1be737f7064ed8881205d9271c2c01453eef262140e0561fb64499abe863"
}
"#;

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(),
        credential_identifier: decode(&values, "credential_identifier").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_seed: decode(&values, "oprf_seed").unwrap(),
        masking_nonce: decode(&values, "masking_nonce").unwrap(),
        envelope_nonce: decode(&values, "envelope_nonce").unwrap(),
        client_nonce: decode(&values, "client_nonce").unwrap(),
        server_nonce: decode(&values, "server_nonce").unwrap(),
        info1: decode(&values, "info1").unwrap(),
        einfo2: decode(&values, "einfo2").unwrap(),
        registration_request: decode(&values, "registration_request").unwrap(),
        registration_response: decode(&values, "registration_response").unwrap(),
        registration_upload: decode(&values, "registration_upload").unwrap(),
        credential_request: decode(&values, "credential_request").unwrap(),
        credential_response: decode(&values, "credential_response").unwrap(),
        credential_finalization: decode(&values, "credential_finalization").unwrap(),
        client_registration_state: decode(&values, "client_registration_state").unwrap(),
        client_login_state: decode(&values, "client_login_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(),
        session_key: decode(&values, "session_key").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!(
            "\"credential_identifier\": \"{}\",\n",
            hex::encode(&p.credential_identifier)
        )
        .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_seed\": \"{}\",\n", hex::encode(&p.oprf_seed)).as_str());
    s.push_str(
        format!(
            "\"masking_nonce\": \"{}\",\n",
            hex::encode(&p.masking_nonce)
        )
        .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!("\"info1\": \"{}\",\n", hex::encode(&p.info1)).as_str());
    s.push_str(format!("\"einfo2\": \"{}\",\n", hex::encode(&p.einfo2)).as_str());
    s.push_str(
        format!(
            "\"registration_request\": \"{}\",\n",
            hex::encode(&p.registration_request)
        )
        .as_str(),
    );
    s.push_str(
        format!(
            "\"registration_response\": \"{}\",\n",
            hex::encode(&p.registration_response)
        )
        .as_str(),
    );
    s.push_str(
        format!(
            "\"registration_upload\": \"{}\",\n",
            hex::encode(&p.registration_upload)
        )
        .as_str(),
    );
    s.push_str(
        format!(
            "\"credential_request\": \"{}\",\n",
            hex::encode(&p.credential_request)
        )
        .as_str(),
    );
    s.push_str(
        format!(
            "\"credential_response\": \"{}\",\n",
            hex::encode(&p.credential_response)
        )
        .as_str(),
    );
    s.push_str(
        format!(
            "\"credential_finalization\": \"{}\",\n",
            hex::encode(&p.credential_finalization)
        )
        .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_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!("\"session_key\": \"{}\"\n", hex::encode(&p.session_key)).as_str());
    s.push_str("}\n");
    s
}

fn generate_parameters<CS: CipherSuite>() -> TestVectorParameters {
    let mut rng = OsRng;

    // Inputs
    let server_s_kp = KeyPair::<CS::Group>::generate_random(&mut rng);
    let server_e_kp = KeyPair::<CS::Group>::generate_random(&mut rng);
    let client_s_kp = KeyPair::<CS::Group>::generate_random(&mut rng);
    let client_e_kp = KeyPair::<CS::Group>::generate_random(&mut rng);
    let credential_identifier = b"credIdentifier";
    let id_u = b"idU";
    let id_s = b"idS";
    let password = b"password";
    let mut oprf_seed = [0u8; 64];
    rng.fill_bytes(&mut oprf_seed);
    let mut masking_nonce = [0u8; 64];
    rng.fill_bytes(&mut masking_nonce);
    let mut envelope_nonce = [0u8; 32];
    rng.fill_bytes(&mut envelope_nonce);
    let mut client_nonce = vec![0u8; NonceLen::to_usize()];
    rng.fill_bytes(&mut client_nonce);
    let mut server_nonce = vec![0u8; NonceLen::to_usize()];
    rng.fill_bytes(&mut server_nonce);

    let server_setup =
        ServerSetup::<CS>::deserialize(&[&oprf_seed, &server_s_kp.private().to_arr()[..]].concat())
            .unwrap();

    let blinding_factor = CS::Group::random_nonzero_scalar(&mut rng);
    let blinding_factor_bytes = CS::Group::scalar_as_bytes(&blinding_factor).clone();

    let info1 = b"info1";
    let einfo2 = b"einfo2";

    let mut blinding_factor_registration_rng = CycleRng::new(blinding_factor_bytes.to_vec());
    let client_registration_start_result =
        ClientRegistration::<CS>::start(&mut blinding_factor_registration_rng, password).unwrap();
    let blinding_factor_bytes_returned =
        CS::Group::scalar_as_bytes(&client_registration_start_result.state.token.blind).clone();
    assert_eq!(
        hex::encode(&blinding_factor_bytes),
        hex::encode(&blinding_factor_bytes_returned)
    );

    let registration_request_bytes = client_registration_start_result
        .message
        .serialize()
        .to_vec();
    let client_registration_state = client_registration_start_result.state.serialize().to_vec();

    let server_registration_start_result = ServerRegistration::<CS>::start(
        &server_setup,
        client_registration_start_result.message,
        &credential_identifier[..],
    )
    .unwrap();
    let registration_response_bytes = server_registration_start_result
        .message
        .serialize()
        .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 client_registration_finish_result = client_registration_start_result
        .state
        .finish(
            &mut finish_registration_rng,
            server_registration_start_result.message,
            ClientRegistrationFinishParameters::WithIdentifiers(id_u.to_vec(), id_s.to_vec()),
        )
        .unwrap();
    let registration_upload_bytes = client_registration_finish_result
        .message
        .serialize()
        .to_vec();

    let password_file = ServerRegistration::finish(client_registration_finish_result.message);
    let password_file_bytes = password_file.serialize();

    let mut client_login_start: Vec<u8> = Vec::new();
    client_login_start.extend_from_slice(&blinding_factor_bytes);
    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 client_login_start_result = ClientLogin::<CS>::start(
        &mut client_login_start_rng,
        password,
        ClientLoginStartParameters::WithInfo(info1.to_vec()),
    )
    .unwrap();
    let credential_request_bytes = client_login_start_result.message.serialize().to_vec();
    let client_login_state = client_login_start_result.state.serialize().to_vec();

    let mut server_e_sk_and_nonce_rng = CycleRng::new(
        [
            masking_nonce.to_vec(),
            server_e_kp.private().to_arr().to_vec(),
            server_nonce.to_vec(),
        ]
        .concat(),
    );
    let server_login_start_result = ServerLogin::<CS>::start(
        &mut server_e_sk_and_nonce_rng,
        &server_setup,
        Some(password_file),
        client_login_start_result.message,
        credential_identifier,
        ServerLoginStartParameters::WithInfoAndIdentifiers(
            einfo2.to_vec(),
            id_u.to_vec(),
            id_s.to_vec(),
        ),
    )
    .unwrap();
    let credential_response_bytes = server_login_start_result.message.serialize().to_vec();
    let server_login_state = server_login_start_result.state.serialize().to_vec();

    let client_login_finish_result = client_login_start_result
        .state
        .finish(
            server_login_start_result.message,
            ClientLoginFinishParameters::WithIdentifiers(id_u.to_vec(), id_s.to_vec()),
        )
        .unwrap();
    let credential_finalization_bytes = client_login_finish_result.message.serialize();

    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(),
        credential_identifier: credential_identifier.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_seed: oprf_seed.to_vec(),
        masking_nonce: masking_nonce.to_vec(),
        envelope_nonce: envelope_nonce.to_vec(),
        client_nonce: client_nonce.to_vec(),
        server_nonce: server_nonce.to_vec(),
        info1: info1.to_vec(),
        einfo2: einfo2.to_vec(),
        registration_request: registration_request_bytes,
        registration_response: registration_response_bytes,
        registration_upload: registration_upload_bytes,
        credential_request: credential_request_bytes,
        credential_response: credential_response_bytes,
        credential_finalization: credential_finalization_bytes,
        password_file: password_file_bytes,
        client_registration_state,
        client_login_state,
        server_login_state,
        session_key: client_login_finish_result.session_key,
        export_key: client_registration_finish_result.export_key.to_vec(),
    }
}

#[test]
fn generate_test_vectors() {
    let parameters = generate_parameters::<RistrettoSha5123dhNoSlowHash>();
    println!("{}", stringify_test_vectors(&parameters));
}

#[test]
fn test_registration_request() -> Result<(), ProtocolError> {
    let parameters = populate_test_vectors(&serde_json::from_str(TEST_VECTOR).unwrap());
    let mut rng = CycleRng::new(parameters.blinding_factor.to_vec());
    let client_registration_start_result =
        ClientRegistration::<RistrettoSha5123dhNoSlowHash>::start(&mut rng, &parameters.password)?;
    assert_eq!(
        hex::encode(&parameters.registration_request),
        hex::encode(client_registration_start_result.message.serialize())
    );
    assert_eq!(
        hex::encode(&parameters.client_registration_state),
        hex::encode(client_registration_start_result.state.serialize())
    );
    Ok(())
}

#[cfg(feature = "serialize")]
#[test]
fn test_serialization() -> Result<(), ProtocolError> {
    let parameters = populate_test_vectors(&serde_json::from_str(TEST_VECTOR).unwrap());
    let mut rng = CycleRng::new(parameters.blinding_factor.to_vec());
    let client_registration_start_result =
        ClientRegistration::<RistrettoSha5123dhNoSlowHash>::start(&mut rng, &parameters.password)?;
    {
        // Test the json serialization (human-readable, base64).
        let registration_request_json =
            serde_json::to_string(&client_registration_start_result.message).unwrap();
        assert_eq!(
            registration_request_json,
            r#""Ol2ftg5ukel9pspCWnroxd784qwMbYmoGJ9C+Sj6PwQ=""#
        );
        let registration_request: RegistrationRequest<RistrettoSha5123dhNoSlowHash> =
            serde_json::from_str(&registration_request_json).unwrap();
        assert_eq!(
            hex::encode(client_registration_start_result.message.serialize()),
            hex::encode(registration_request.serialize()),
        );
    }
    {
        // Test the bincode serialization (binary).
        let registration_request_bin =
            bincode::serialize(&client_registration_start_result.message).unwrap();
        assert_eq!(registration_request_bin.len(), 40);
        let registration_request: RegistrationRequest<RistrettoSha5123dhNoSlowHash> =
            bincode::deserialize(&registration_request_bin).unwrap();
        assert_eq!(
            hex::encode(client_registration_start_result.message.serialize()),
            hex::encode(registration_request.serialize()),
        );
    }
    Ok(())
}
#[test]
fn test_registration_response() -> Result<(), ProtocolError> {
    let parameters = populate_test_vectors(&serde_json::from_str(TEST_VECTOR).unwrap());

    let server_setup = ServerSetup::<RistrettoSha5123dhNoSlowHash>::deserialize(
        &[&parameters.oprf_seed[..], &parameters.server_s_sk[..]].concat(),
    )?;

    let server_registration_start_result =
        ServerRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &server_setup,
            RegistrationRequest::deserialize(&parameters.registration_request[..])?,
            &parameters.credential_identifier,
        )?;
    assert_eq!(
        hex::encode(parameters.registration_response),
        hex::encode(server_registration_start_result.message.serialize())
    );
    Ok(())
}

#[test]
fn test_registration_upload() -> Result<(), ProtocolError> {
    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 result = ClientRegistration::<RistrettoSha5123dhNoSlowHash>::deserialize(
        &parameters.client_registration_state[..],
    )?
    .finish(
        &mut finish_registration_rng,
        RegistrationResponse::deserialize(&parameters.registration_response[..])?,
        ClientRegistrationFinishParameters::WithIdentifiers(parameters.id_u, parameters.id_s),
    )?;

    assert_eq!(
        hex::encode(parameters.registration_upload),
        hex::encode(result.message.serialize())
    );
    assert_eq!(
        hex::encode(parameters.export_key),
        hex::encode(result.export_key.to_vec())
    );

    Ok(())
}

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

    let password_file = ServerRegistration::finish(RegistrationUpload::<
        RistrettoSha5123dhNoSlowHash,
    >::deserialize(
        &parameters.registration_upload[..]
    )?);

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

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

    let client_login_start_rng = [
        parameters.blinding_factor,
        parameters.client_e_sk,
        parameters.client_nonce,
    ]
    .concat();
    let mut client_login_start_rng = CycleRng::new(client_login_start_rng);
    let client_login_start_result = ClientLogin::<RistrettoSha5123dhNoSlowHash>::start(
        &mut client_login_start_rng,
        &parameters.password,
        ClientLoginStartParameters::WithInfo(parameters.info1),
    )?;
    assert_eq!(
        hex::encode(&parameters.credential_request),
        hex::encode(client_login_start_result.message.serialize())
    );
    assert_eq!(
        hex::encode(&parameters.client_login_state),
        hex::encode(client_login_start_result.state.serialize())
    );
    Ok(())
}

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

    let server_setup = ServerSetup::<RistrettoSha5123dhNoSlowHash>::deserialize(
        &[&parameters.oprf_seed[..], &parameters.server_s_sk[..]].concat(),
    )?;

    let mut server_e_sk_and_nonce_rng = CycleRng::new(
        [
            parameters.masking_nonce,
            parameters.server_e_sk,
            parameters.server_nonce,
        ]
        .concat(),
    );
    let server_login_start_result = ServerLogin::<RistrettoSha5123dhNoSlowHash>::start(
        &mut server_e_sk_and_nonce_rng,
        &server_setup,
        Some(ServerRegistration::deserialize(
            &parameters.password_file[..],
        )?),
        CredentialRequest::<RistrettoSha5123dhNoSlowHash>::deserialize(
            &parameters.credential_request[..],
        )?,
        &parameters.credential_identifier,
        ServerLoginStartParameters::WithInfoAndIdentifiers(
            parameters.einfo2.to_vec(),
            parameters.id_u,
            parameters.id_s,
        ),
    )?;
    assert_eq!(
        hex::encode(&parameters.info1),
        hex::encode(server_login_start_result.plain_info),
    );
    assert_eq!(
        hex::encode(&parameters.credential_response),
        hex::encode(server_login_start_result.message.serialize())
    );
    assert_eq!(
        hex::encode(&parameters.server_login_state),
        hex::encode(server_login_start_result.state.serialize())
    );
    Ok(())
}

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

    let client_login_finish_result = ClientLogin::<RistrettoSha5123dhNoSlowHash>::deserialize(
        &parameters.client_login_state[..],
    )?
    .finish(
        CredentialResponse::<RistrettoSha5123dhNoSlowHash>::deserialize(
            &parameters.credential_response[..],
        )?,
        ClientLoginFinishParameters::WithIdentifiers(parameters.id_u, parameters.id_s),
    )?;

    assert_eq!(
        hex::encode(&parameters.einfo2),
        hex::encode(&client_login_finish_result.confidential_info)
    );
    assert_eq!(
        hex::encode(&parameters.server_s_pk),
        hex::encode(&client_login_finish_result.server_s_pk.to_arr().to_vec())
    );
    assert_eq!(
        hex::encode(&parameters.session_key),
        hex::encode(&client_login_finish_result.session_key)
    );
    assert_eq!(
        hex::encode(&parameters.credential_finalization),
        hex::encode(client_login_finish_result.message.serialize())
    );
    assert_eq!(
        hex::encode(&parameters.export_key),
        hex::encode(client_login_finish_result.export_key)
    );

    Ok(())
}

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

    let server_login_result = ServerLogin::<RistrettoSha5123dhNoSlowHash>::deserialize(
        &parameters.server_login_state[..],
    )?
    .finish(CredentialFinalization::deserialize(
        &parameters.credential_finalization[..],
    )?)?;

    assert_eq!(
        hex::encode(parameters.session_key),
        hex::encode(&server_login_result.session_key)
    );

    Ok(())
}

fn test_complete_flow(
    registration_password: &[u8],
    login_password: &[u8],
) -> Result<(), ProtocolError> {
    let credential_identifier = b"credentialIdentifier";
    let mut client_rng = OsRng;
    let mut server_rng = OsRng;
    let server_setup = ServerSetup::<RistrettoSha5123dhNoSlowHash>::new(&mut server_rng);
    let client_registration_start_result =
        ClientRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &mut client_rng,
            registration_password,
        )?;
    let server_registration_start_result =
        ServerRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &server_setup,
            client_registration_start_result.message,
            credential_identifier,
        )?;
    let client_registration_finish_result = client_registration_start_result.state.finish(
        &mut client_rng,
        server_registration_start_result.message,
        ClientRegistrationFinishParameters::default(),
    )?;
    let p_file = ServerRegistration::finish(client_registration_finish_result.message);
    let client_login_start_result = ClientLogin::<RistrettoSha5123dhNoSlowHash>::start(
        &mut client_rng,
        login_password,
        ClientLoginStartParameters::default(),
    )?;
    let server_login_start_result = ServerLogin::<RistrettoSha5123dhNoSlowHash>::start(
        &mut server_rng,
        &server_setup,
        Some(p_file),
        client_login_start_result.message,
        credential_identifier,
        ServerLoginStartParameters::default(),
    )?;

    let client_login_result = client_login_start_result.state.finish(
        server_login_start_result.message,
        ClientLoginFinishParameters::default(),
    );

    if hex::encode(registration_password) == hex::encode(login_password) {
        let client_login_finish_result = client_login_result?;
        let server_login_finish_result = server_login_start_result
            .state
            .finish(client_login_finish_result.message)?;

        assert_eq!(
            hex::encode(&server_login_finish_result.session_key),
            hex::encode(&client_login_finish_result.session_key)
        );
        assert_eq!(
            hex::encode(client_registration_finish_result.export_key),
            hex::encode(client_login_finish_result.export_key)
        );
    } else {
        assert!(match client_login_result {
            Err(ProtocolError::VerificationError(PakeError::InvalidLoginError)) => true,
            _ => false,
        });
    }

    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")
}

// Zeroize tests

#[test]
fn test_zeroize_client_registration_start() -> Result<(), ProtocolError> {
    let mut client_rng = OsRng;
    let client_registration_start_result =
        ClientRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &mut client_rng,
            STR_PASSWORD.as_bytes(),
        )?;

    let mut state = client_registration_start_result.state;
    let ptrs = state.as_byte_ptrs();
    state.zeroize();

    for (ptr, len) in ptrs {
        let bytes = unsafe { from_raw_parts(ptr, len) };
        assert!(bytes.iter().all(|&x| x == 0));
    }

    Ok(())
}

#[test]
fn test_zeroize_client_registration_finish() -> Result<(), ProtocolError> {
    let mut client_rng = OsRng;
    let mut server_rng = OsRng;
    let server_setup = ServerSetup::<RistrettoSha5123dhNoSlowHash>::new(&mut server_rng);
    let client_registration_start_result =
        ClientRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &mut client_rng,
            STR_PASSWORD.as_bytes(),
        )?;
    let server_registration_start_result =
        ServerRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &server_setup,
            client_registration_start_result.message,
            STR_CREDENTIAL_IDENTIFIER.as_bytes(),
        )?;
    let client_registration_finish_result = client_registration_start_result.state.finish(
        &mut client_rng,
        server_registration_start_result.message,
        ClientRegistrationFinishParameters::default(),
    )?;

    let mut state = client_registration_finish_result.state;
    let ptrs = state.as_byte_ptrs();
    state.zeroize();

    for (ptr, len) in ptrs {
        let bytes = unsafe { from_raw_parts(ptr, len) };
        assert!(bytes.iter().all(|&x| x == 0));
    }

    Ok(())
}

#[test]
fn test_zeroize_server_registration_finish() -> Result<(), ProtocolError> {
    let mut client_rng = OsRng;
    let mut server_rng = OsRng;
    let server_setup = ServerSetup::<RistrettoSha5123dhNoSlowHash>::new(&mut server_rng);
    let client_registration_start_result =
        ClientRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &mut client_rng,
            STR_PASSWORD.as_bytes(),
        )?;
    let server_registration_start_result =
        ServerRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &server_setup,
            client_registration_start_result.message,
            STR_CREDENTIAL_IDENTIFIER.as_bytes(),
        )?;
    let client_registration_finish_result = client_registration_start_result.state.finish(
        &mut client_rng,
        server_registration_start_result.message,
        ClientRegistrationFinishParameters::default(),
    )?;
    let p_file = ServerRegistration::finish(client_registration_finish_result.message);

    let mut state = p_file;
    let ptrs = state.as_byte_ptrs();
    state.zeroize();

    for (ptr, len) in ptrs {
        let bytes = unsafe { from_raw_parts(ptr, len) };
        assert!(bytes.iter().all(|&x| x == 0));
    }

    Ok(())
}

#[test]
fn test_zeroize_client_login_start() -> Result<(), ProtocolError> {
    let mut client_rng = OsRng;
    let client_login_start_result = ClientLogin::<RistrettoSha5123dhNoSlowHash>::start(
        &mut client_rng,
        STR_PASSWORD.as_bytes(),
        ClientLoginStartParameters::default(),
    )?;

    let mut state = client_login_start_result.state;
    let ptrs = state.as_byte_ptrs();
    state.zeroize();

    for (ptr, len) in ptrs {
        let bytes = unsafe { from_raw_parts(ptr, len) };
        assert!(bytes.iter().all(|&x| x == 0));
    }

    Ok(())
}

#[test]
fn test_zeroize_server_login_start() -> Result<(), ProtocolError> {
    let mut client_rng = OsRng;
    let mut server_rng = OsRng;
    let server_setup = ServerSetup::<RistrettoSha5123dhNoSlowHash>::new(&mut server_rng);
    let client_registration_start_result =
        ClientRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &mut client_rng,
            STR_PASSWORD.as_bytes(),
        )?;
    let server_registration_start_result =
        ServerRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &server_setup,
            client_registration_start_result.message,
            STR_CREDENTIAL_IDENTIFIER.as_bytes(),
        )?;
    let client_registration_finish_result = client_registration_start_result.state.finish(
        &mut client_rng,
        server_registration_start_result.message,
        ClientRegistrationFinishParameters::default(),
    )?;
    let p_file = ServerRegistration::finish(client_registration_finish_result.message);
    let client_login_start_result = ClientLogin::<RistrettoSha5123dhNoSlowHash>::start(
        &mut client_rng,
        STR_PASSWORD.as_bytes(),
        ClientLoginStartParameters::default(),
    )?;
    let server_login_start_result = ServerLogin::<RistrettoSha5123dhNoSlowHash>::start(
        &mut server_rng,
        &server_setup,
        Some(p_file),
        client_login_start_result.message,
        STR_CREDENTIAL_IDENTIFIER.as_bytes(),
        ServerLoginStartParameters::default(),
    )?;

    let mut state = server_login_start_result.state;
    let ptrs = state.as_byte_ptrs();
    state.zeroize();

    for (ptr, len) in ptrs {
        let bytes = unsafe { from_raw_parts(ptr, len) };
        assert!(bytes.iter().all(|&x| x == 0));
    }

    Ok(())
}

#[test]
fn test_zeroize_client_login_finish() -> Result<(), ProtocolError> {
    let mut client_rng = OsRng;
    let mut server_rng = OsRng;
    let server_setup = ServerSetup::<RistrettoSha5123dhNoSlowHash>::new(&mut server_rng);
    let client_registration_start_result =
        ClientRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &mut client_rng,
            STR_PASSWORD.as_bytes(),
        )?;
    let server_registration_start_result =
        ServerRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &server_setup,
            client_registration_start_result.message,
            STR_CREDENTIAL_IDENTIFIER.as_bytes(),
        )?;
    let client_registration_finish_result = client_registration_start_result.state.finish(
        &mut client_rng,
        server_registration_start_result.message,
        ClientRegistrationFinishParameters::default(),
    )?;
    let p_file = ServerRegistration::finish(client_registration_finish_result.message);
    let client_login_start_result = ClientLogin::<RistrettoSha5123dhNoSlowHash>::start(
        &mut client_rng,
        STR_PASSWORD.as_bytes(),
        ClientLoginStartParameters::default(),
    )?;
    let server_login_start_result = ServerLogin::<RistrettoSha5123dhNoSlowHash>::start(
        &mut server_rng,
        &server_setup,
        Some(p_file),
        client_login_start_result.message,
        STR_CREDENTIAL_IDENTIFIER.as_bytes(),
        ServerLoginStartParameters::default(),
    )?;
    let client_login_finish_result = client_login_start_result.state.finish(
        server_login_start_result.message,
        ClientLoginFinishParameters::default(),
    )?;

    let mut state = client_login_finish_result.state;
    let ptrs = state.as_byte_ptrs();
    state.zeroize();

    for (ptr, len) in ptrs {
        let bytes = unsafe { from_raw_parts(ptr, len) };
        assert!(bytes.iter().all(|&x| x == 0));
    }

    Ok(())
}

#[test]
fn test_zeroize_server_login_finish() -> Result<(), ProtocolError> {
    let mut client_rng = OsRng;
    let mut server_rng = OsRng;
    let server_setup = ServerSetup::<RistrettoSha5123dhNoSlowHash>::new(&mut server_rng);
    let client_registration_start_result =
        ClientRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &mut client_rng,
            STR_PASSWORD.as_bytes(),
        )?;
    let server_registration_start_result =
        ServerRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &server_setup,
            client_registration_start_result.message,
            STR_CREDENTIAL_IDENTIFIER.as_bytes(),
        )?;
    let client_registration_finish_result = client_registration_start_result.state.finish(
        &mut client_rng,
        server_registration_start_result.message,
        ClientRegistrationFinishParameters::default(),
    )?;
    let p_file = ServerRegistration::finish(client_registration_finish_result.message);
    let client_login_start_result = ClientLogin::<RistrettoSha5123dhNoSlowHash>::start(
        &mut client_rng,
        STR_PASSWORD.as_bytes(),
        ClientLoginStartParameters::default(),
    )?;
    let server_login_start_result = ServerLogin::<RistrettoSha5123dhNoSlowHash>::start(
        &mut server_rng,
        &server_setup,
        Some(p_file),
        client_login_start_result.message,
        STR_CREDENTIAL_IDENTIFIER.as_bytes(),
        ServerLoginStartParameters::default(),
    )?;
    let client_login_finish_result = client_login_start_result.state.finish(
        server_login_start_result.message,
        ClientLoginFinishParameters::default(),
    )?;
    let server_login_finish_result = server_login_start_result
        .state
        .finish(client_login_finish_result.message)?;

    let mut state = server_login_finish_result.state;
    let ptrs = state.as_byte_ptrs();
    state.zeroize();

    for (ptr, len) in ptrs {
        let bytes = unsafe { from_raw_parts(ptr, len) };
        assert!(bytes.iter().all(|&x| x == 0));
    }

    Ok(())
}

#[test]
fn test_scalar_always_nonzero() -> Result<(), ProtocolError> {
    // Start out with a bunch of zeros to force resampling of scalar
    let mut client_registration_rng = CycleRng::new([vec![0u8; 128], vec![1u8; 128]].concat());
    let client_registration_start_result =
        ClientRegistration::<RistrettoSha5123dhNoSlowHash>::start(
            &mut client_registration_rng,
            STR_PASSWORD.as_bytes(),
        )?;

    assert_ne!(
        RistrettoPoint::identity(),
        client_registration_start_result
            .message
            .get_alpha_for_testing()
    );

    Ok(())
}