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README.md |
README.md
tor-cert
Implementation for Tor certificates
Overview
The tor-cert
crate implements the binary certificate types
documented in Tor's cert-spec.txt, which are used when
authenticating Tor channels. (Eventually, support for onion service
certificate support will get added too.)
This crate is part of Arti, a project to implement Tor in Rust.
There are other types of certificate used by Tor as well, and they
are implemented in other places. In particular, see
[tor-netdoc::doc::authcert
] for the certificate types used by
authorities in the directory protocol.
Design notes
The tor-cert
code is in its own separate crate because it is
required by several other higher-level crates that do not depend
upon each other. For example, [tor-netdoc
] parses encoded
certificates from router descriptors, while [tor-proto
] uses
certificates when authenticating relays.
Examples
Parsing, validating, and inspecting a certificate:
use base64::decode;
use tor_cert::*;
use tor_checkable::*;
// Taken from a random relay on the Tor network.
let cert_base64 =
"AQQABrntAThPWJ4nFH1L77Ar+emd4GPXZTPUYzIwmR2H6Zod5TvXAQAgBAC+vzqh
VFO1SGATubxcrZzrsNr+8hrsdZtyGg/Dde/TqaY1FNbeMqtAPMziWOd6txzShER4
qc/haDk5V45Qfk6kjcKw+k7cPwyJeu+UF/azdoqcszHRnUHRXpiPzudPoA4=";
// Remove the whitespace, so base64 doesn't choke on it.
let cert_base64: String = cert_base64.split_whitespace().collect();
// Decode the base64.
let cert_bin = base64::decode(cert_base64).unwrap();
// Decode the cert and check its signature.
let cert = Ed25519Cert::decode(&cert_bin).unwrap()
.check_key(&None).unwrap()
.check_signature().unwrap()
.dangerously_assume_timely();
let signed_key = cert.subject_key();
License: MIT OR Apache-2.0