RustCrypto: NIST P-256 (secp256r1) elliptic curve
NIST P-256 elliptic curve (a.k.a. prime256v1, secp256r1) types implemented
in terms of traits from the elliptic-curve crate.
Optionally includes an arithmetic feature providing scalar and
affine/projective point types with support for constant-time scalar
multiplication, which can be used to implement protocols such as ECDH.
⚠️ 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.
USE AT YOUR OWN RISK!
Supported Algorithms
- Elliptic Curve Diffie-Hellman (ECDH): gated under the
ecdhfeature. - Elliptic Curve Digital Signature Algorithm (ECDSA): gated under the
ecdsafeature.
About NIST P-256
NIST P-256 is a Weierstrass curve specified in FIPS 186-4: Digital Signature Standard (DSS):
https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf
Also known as prime256v1 (ANSI X9.62) and secp256r1 (SECG), it's included in the US National Security Agency's "Suite B" and is widely used in protocols like TLS and the associated X.509 PKI.
Minimum Supported Rust Version
Rust 1.47 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
License
All crates 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.