RustCrypto: Constant-Time Utilities
Constant-time utility library with selection and equality testing support targeting cryptographic
applications. Supports const fn where appropriate. Built on the cmov crate which provides
architecture-specific predication intrinsics. Heavily inspired by the subtle crate.
About
This crate contains constant-time equivalents of the bool and Option types (Choice and
CtOption respectively), along with traits that can be used in combination with them.
The CtOption type notably provides eagerly evaluated combinator methods (as opposed to the lazily
evaluated combinators on Option) which make it possible to write constant-time code using
an idiomatic Rust style.
This is an experimental next-generation constant-time library inspired by subtle, but for now we
recommend you continue to stick with subtle. We may attempt to get some of the changes in this
library incorporated into subtle for a potential v3.0.
⚠️ Security Warning
The implementation contained in this crate has never been independently audited!
USE AT YOUR OWN RISK!
Minimum Supported Rust Version (MSRV) Policy
MSRV increases are not considered breaking changes and can happen in patch releases.
The crate MSRV accounts for all supported targets and crate feature combinations.
License
Licensed under either of:
at your option.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.