use std::hash::Hash;
use argon2::{hash_raw, verify_raw};
use exun::RawUnexpected;
/// A custom pepper used to hide passwords
static PEPPER: [u8; 16] = [
0x98, 0x7f, 0x6f, 0xce, 0x20, 0x76, 0x2c, 0x8a, 0xae, 0xf6, 0xee, 0x45, 0xb3, 0x6b, 0x1f, 0x69,
];
/// The configuration used for hashing and verifying passwords
static CONFIG: argon2::Config<'_> = argon2::Config {
hash_length: 256,
lanes: 4,
mem_cost: 5333,
time_cost: 4,
secret: &PEPPER,
ad: &[],
thread_mode: argon2::ThreadMode::Sequential,
variant: argon2::Variant::Argon2i,
version: argon2::Version::Version13,
};
/// A password hash and salt for a user
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct PasswordHash {
hash: Box<[u8]>,
salt: Box<[u8]>,
}
impl Hash for PasswordHash {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
for byte in self.hash.iter() {
state.write_u8(*byte)
}
}
}
impl PasswordHash {
/// Hash a password using Argon2
pub fn new(password: &str) -> Result<Self, RawUnexpected> {
let password = password.as_bytes();
let salt: [u8; 16] = rand::random();
let salt = Box::from(salt);
let hash = hash_raw(password, &salt, &CONFIG)?.into_boxed_slice();
Ok(Self { hash, salt })
}
/// Create this structure from a given hash and salt
pub fn from_hash_salt(hash: &[u8], salt: &[u8]) -> Self {
Self {
hash: Box::from(hash),
salt: Box::from(salt),
}
}
/// Get the password hash
pub fn hash(&self) -> &[u8] {
&self.hash
}
/// Get the salt used for the hash
pub fn salt(&self) -> &[u8] {
&self.salt
}
/// Check if the given password is the one that was hashed
pub fn check_password(&self, password: &str) -> Result<bool, RawUnexpected> {
Ok(verify_raw(
password.as_bytes(),
&self.salt,
&self.hash,
&CONFIG,
)?)
}
}
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