Rust crate for encoding/decoding binary data to/from base64 and hex encodings while avoiding data-dependent branching/table lookups, and therefore providing "best effort" constant-time operation.
Also includes a non-constant-time Bech32 encoder/decoder gated under the
bech32-preview Cargo feature (with a goal of eventually making it
constant-time).
Useful for encoding/decoding secret values such as cryptographic keys.
Rust 1.56 or newer.
In the future, we reserve the right to change MSRV (i.e. MSRV is out-of-scope for this crate's SemVer guarantees), however when we do it will be accompanied by a minor version bump.
While this crate takes care to avoid data-dependent branching, that does not actually make it "constant time", which is an architecture-dependent property.
This crate is a "best effort" attempt at providing a constant time encoding library, however it presently provides no guarantees, nor has it been independently audited for security vulnerabilities.
Use at your own risk.
Copyright © 2018-2021 iqlusion
subtle-encoding is distributed under the terms of either the MIT license or the Apache License (Version 2.0), at your option.
See LICENSE (Apache License, Version 2.0) file in the iqlusioninc/crates
toplevel directory of this repository or LICENSE-MIT for details.