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:

toml [dependencies] ff = "0.8"

The ff crate contains the Field and PrimeField 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:

toml [dependencies] ff = { version = "0.8", features = ["derive"] }

And then use the macro like so:

```rust

[macro_use]

extern crate ff;

[derive(PrimeField)]

[PrimeFieldModulus = "52435875175126190479447740508185965837690552500527637822603658699938581184513"]

[PrimeFieldGenerator = "7"]

[PrimeFieldReprEndianness = "little"]

struct Fp([u64; 4]); ```

And that's it! Fp now implements Field and PrimeField.

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.