Expand description
§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 base64ct::{Base64, Encoding as _};
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_vec(&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
Modules§
- RSA->Ed25519 cross-certificates
Structs§
- Recognized values for Tor’s certificate type field.
- Structure for an Ed25519-signed certificate as described in Tor’s cert-spec.txt.
- Builder for
Ed25519Cert
. - EncodedEd25519Cert
encode
An encoded ed25519 certificate, created usingEd25519CertConstructor::encode_and_sign
. - Extension identifiers for extensions in certificates.
- Identifiers for the type of key or object getting signed.
- A parsed Ed25519 certificate. Maybe it includes its signing key; maybe it doesn’t.
- A certificate that has been parsed and signature-checked, but whose timeliness has not been checked.
- A certificate that has been parsed, but whose signature and timeliness have not been checked.
- A key whose type we didn’t recognize.
Enums§
- CertEncodeError
encode
An error related to signing or encoding a certificate - An error related to checking or validating a certificate
- One of the data types that can be certified by an Ed25519Cert.
- Error type for Ed25519CertConstructor