5cc3fe1629
These crates have had trivial changes only: typically, changes to documentation or to clippy warnings. There's no good reason to update which version of them other crates depend on, so we only bump _their_ patchlevels. ``` tor-async-utils caret safelog tor-events tor-units tor-rtcompat tor-rpcbase tor-llcrypto tor-protover tor-bytes tor-hscrypto tor-socksproto tor-cert tor-cell tor-consdiff tor-congestion arti-rpcserver arti-testing arti-bench arti-config arti-hyper ``` |
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| README.md | ||
README.md
tor-llcrypto
Low-level cryptographic implementations for Tor.
Overview
The tor-llcrypto crate wraps lower-level cryptographic primitives that Tor
needs, and provides a few smaller pieces of cryptographic functionality that
are commonly required to implement Tor correctly.
This crate is part of Arti, a project to implement Tor in Rust. Many other crates in Arti depend on it.
You probably wouldn't want to use this crate for implementing non-Tor-based protocols; instead you should probably use the other crates that it depends on if you have a low-level protocol to implement, or a higher-level cryptographic system if you want to add security to something else. It is easy to accidentally put these functions together in ways that are unsafe.
Why a separate crate?
Why do we collect and re-export our cryptography here in tor-llcrypto,
instead of having the different crates in Arti use underlying cryptographic
crates directly?
By wrapping our cryptography in this crate, we ensure that we're using the same implementations across our ecosystem, and provide a single place to upgrade and test our cryptography.
Adding to tor-llcrypto
Any low-level cryptographic algorithm that is used by at least two other
crates in Arti is a candidate for inclusion in tor-llcrypto, especially if
that algorithm's purpose is not specific to any single piece of the Tor
algorithm.
Cryptographic traits (like those from RustCrypto) don't have to go in
tor-llcrypto, since they are interfaces rather than implementations.
Contents
Encryption is implemented in [cipher]: Currently only AES is exposed or
needed.
Cryptographic digests are in [d]: The Tor protocol uses several digests in
different places, and these are all collected here.
Public key cryptography (including signatures, encryption, and key
agreement) are in [pk]. Older parts of the Tor protocol require RSA;
newer parts are based on Curve25519 and Ed25519. There is also functionality
here for key manipulation for the keys used in these symmetric algorithms.
The [util] module has some miscellaneous compatibility utilities for
manipulating cryptography-related objects and code.
Features
API features
relay -- enable cryptography that's only used on relays.
hsv3-client -- enable cryptography that's only needed when running as a v3
onion service client.
hsv3-service -- enable cryptography that's only needed when running as a v3
onion service.
keymgr -- enable cryptography that's only needed for key management
cvt-x25519 -- export functions for converting ed25519 keys to x25519 and
vice-versa
Acceleration features
These features should never be enabled by default from libraries, since they are not "strictly additive": they disable one implementation in order to enable another.
with-openssl -- Use openssl as the backend for those cryptographic
features it supports.
with-sha1-asm -- Use an assembly implementation of the sha1 algorithm, if
one is enabled.
License: MIT OR Apache-2.0