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use rand::RngCore;
use sha2::Sha256;
use srp::client::{srp_private_key, SrpClient};
use srp::groups::G_2048;
use srp::server::{SrpServer, UserRecord};
fn auth_test(reg_pwd: &[u8], auth_pwd: &[u8]) {
let mut rng = rand::rngs::OsRng::new().unwrap();
let username = b"alice";
// Client instance creation
let mut a = [0u8; 64];
rng.fill_bytes(&mut a);
let client = SrpClient::<Sha256>::new(&a, &G_2048);
// Registration
let mut salt = [0u8; 16];
rng.fill_bytes(&mut salt);
let reg_priv_key = srp_private_key::<Sha256>(username, reg_pwd, &salt);
let verif = client.get_password_verifier(®_priv_key);
// User sends handshake
let a_pub = client.get_a_pub();
// Server retrieve user record from db and processes handshake
let user = UserRecord {
username,
salt: &salt,
verifier: &verif,
};
let mut b = [0u8; 64];
rng.fill_bytes(&mut b);
let server = SrpServer::<Sha256>::new(&user, &a_pub, &b, &G_2048).unwrap();
let (salt, b_pub) = (&user.salt, server.get_b_pub());
// Client processes handshake reply
let auth_priv_key = srp_private_key::<Sha256>(username, auth_pwd, salt);
let client2 = client.process_reply(&auth_priv_key, &b_pub).unwrap();
let proof = client2.get_proof();
// Server processes verification data
println!("Client verification");
let proof2 = server.verify(&proof).unwrap();
let server_key = server.get_key();
// Client verifies server
println!("Server verification");
let user_key = client2.verify_server(&proof2).unwrap();
assert_eq!(server_key, user_key, "server and client keys are not equal");
}
#[test]
fn good_password() {
auth_test(b"password", b"password");
}
#[test]
#[should_panic]
fn bad_password() {
auth_test(b"password", b"paSsword");
}
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