#stb #ecc #crypto #bign-curve256v1 #bignp256

no-std bign256

Pure Rust implementation of the Bign P-256 (a.k.a. bign-curve256v1) elliptic curve as defined in STB 34.101.45-2013, with general purpose curve arithmetic

2 releases

0.13.1 Jan 5, 2024
0.13.0 Jun 27, 2023

#2462 in Cryptography

28 downloads per month

Apache-2.0 OR MIT

17K SLoC

RustCrypto: BIGN P-256 (bign-curve256v1) elliptic curve

crate Docs Build Status Apache2/MIT licensed Rust Version Project Chat

Pure Rust implementation of the BIGN P-256 (a.k.a. bign-curve256v1) elliptic curve with support for ECDSA signing/verification, and general purpose curve arithmetic support implemented in terms of traits from the elliptic-curve crate.


⚠️ Security Warning

The elliptic curve arithmetic contained in this crate has never been independently audited!

This crate has been designed with the goal of ensuring that secret-dependent operations are performed in constant time (using the subtle crate and constant-time formulas). However, it has not been thoroughly assessed to ensure that generated assembly is constant time on common CPU architectures.


Supported Algorithms

About BIGN P-256

BIGN P-256 is a Weierstrass curve specified in STB 34.101.45-2013. Also known as bign-curve256v1.

Minimum Supported Rust Version

Rust 1.65 or higher.

Minimum supported Rust version can be changed in the future, but it will be done with a minor version bump.

SemVer Policy

  • All on-by-default features of this library are covered by SemVer
  • MSRV is considered exempt from SemVer as noted above


All crates licensed under either of

at your option.


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.


~43K SLoC