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WARNING: THIS IS NOT ACTUALLY CONSTANT TIME YET! The jubjub and bls12_381 crates will replace our constant-time usages, but we NEED to fix ff_derive because other users will expect it to implement the Field trait correctly. |
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| Cargo.toml | ||
| LICENSE-APACHE | ||
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| README.md | ||
README.md
ff
ff is a finite field library written in pure Rust, with no unsafe{} code.
Disclaimers
- This library does not provide constant-time guarantees.
Usage
Add the ff crate to your Cargo.toml:
[dependencies]
ff = "0.4"
The ff crate contains Field, PrimeField, PrimeFieldRepr and SqrtField traits.
See the documentation for more.
#![derive(PrimeField)]
If you need an implementation of a prime field, this library also provides a procedural
macro that will expand into an efficient implementation of a prime field when supplied
with the modulus. PrimeFieldGenerator must be an element of Fp of p-1 order, that is
also quadratic nonresidue.
First, enable the derive crate feature:
[dependencies]
ff = { version = "0.4", features = ["derive"] }
And then use the macro like so:
extern crate rand;
#[macro_use]
extern crate ff;
#[derive(PrimeField)]
#[PrimeFieldModulus = "52435875175126190479447740508185965837690552500527637822603658699938581184513"]
#[PrimeFieldGenerator = "7"]
struct Fp(FpRepr);
And that's it! Fp now implements Field and PrimeField. Fp will also implement
SqrtField if supported. The library implements FpRepr itself and derives
PrimeFieldRepr for it.
License
Licensed under either of
- Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
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.