tor_hsservice/replay/
pow.rs

1//! Code for a replay log for Proof-of-Work [`Nonce`]s.
2
3use std::{borrow::Cow, ffi::OsStr};
4
5use tor_hscrypto::pow::v1::{Nonce, Seed};
6
7use super::{ReplayLogType, MAGIC_LEN, OUTPUT_LEN, REPLAY_LOG_SUFFIX};
8
9/// A [`ReplayLogType`] to indicate using [`Nonce`] messages with [`Seed`] names.
10pub(crate) struct PowNonceReplayLogType;
11
12impl ReplayLogType for PowNonceReplayLogType {
13    type Name = Seed;
14    type Message = Nonce;
15
16    const MAGIC: &'static [u8; MAGIC_LEN] = b"<tor hss pow replay Kangaroo12>\n";
17
18    fn format_filename(name: &Seed) -> String {
19        format!("{name}{REPLAY_LOG_SUFFIX}")
20    }
21
22    fn transform_message(message: &Nonce) -> [u8; OUTPUT_LEN] {
23        *message.as_ref()
24    }
25
26    fn parse_log_leafname(leaf: &OsStr) -> Result<Seed, Cow<'static, str>> {
27        let leaf = leaf.to_str().ok_or("not proper unicode")?;
28        let seed = leaf.strip_suffix(REPLAY_LOG_SUFFIX).ok_or("not *.bin")?;
29        seed.parse().or(Err("invalid seed".into()))
30    }
31}