tor_cell/relaycell/hs/pow/
v1.rs

1//! Support for the `v1` proof of work scheme's intro payload extension
2
3use crate::relaycell::hs::pow::ProofOfWorkType;
4use tor_bytes::{EncodeResult, Reader, Result, Writeable, Writer};
5use tor_hscrypto::pow::v1::{Effort, Nonce, SeedHead, SolutionByteArray};
6
7/// Proof of work using the `v1` scheme
8///
9/// Specified as part of <https://spec.torproject.org/rend-spec/introduction-protocol.html#INTRO1_POW_EXT>
10#[derive(derive_more::Constructor, amplify::Getters, Debug, Clone, PartialEq)]
11pub struct ProofOfWorkV1 {
12    /// Nonce value chosen by the client
13    #[getter(as_ref)]
14    nonce: Nonce,
15    /// Effort chosen by the client
16    #[getter(as_copy)]
17    effort: Effort,
18    /// Header with which to identify the applicable service-provided seed
19    #[getter(as_copy)]
20    seed_head: SeedHead,
21    /// Proposed solution proof, not validated
22    ///
23    /// This byte array still needs to be validated first as a well-formed
24    /// Equix solution, and then as a proof for a particular puzzle.
25    #[getter(as_ref)]
26    solution: SolutionByteArray,
27}
28
29impl ProofOfWorkV1 {
30    /// Construct by reading the scheme-specific data, if the scheme ID is correct for [`ProofOfWorkV1`]
31    pub(super) fn try_take_body_from(scheme: u8, b: &mut Reader<'_>) -> Result<Option<Self>> {
32        if scheme == ProofOfWorkType::V1.get() {
33            Ok(Some(Self {
34                nonce: b.extract()?,
35                effort: b.extract()?,
36                seed_head: b.extract()?,
37                solution: b.extract()?,
38            }))
39        } else {
40            Ok(None)
41        }
42    }
43
44    /// Write the scheme and scheme-specific portion the v1 Proof Of Work
45    pub(super) fn write_onto<B: Writer + ?Sized>(&self, b: &mut B) -> EncodeResult<()> {
46        b.write_u8(ProofOfWorkType::V1.get());
47        self.nonce.write_onto(b)?;
48        self.effort.write_onto(b)?;
49        self.seed_head.write_onto(b)?;
50        self.solution.write_onto(b)?;
51        Ok(())
52    }
53}
tor_cell/relaycell/hs/pow/v1.rs

tor_cell/relaycell/hs/pow/
v1.rs
