Crate p521

RustCrypto: NIST P-521 (secp521r1) elliptic curve

Pure Rust implementation of the NIST P-521 (a.k.a. secp521r1) elliptic curve.

Documentation

⚠️ 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 ecdh feature.
• Elliptic Curve Digital Signature Algorithm (ECDSA): gated under the ecdsa feature.

About P-521

NIST P-521 is a Weierstrass curve specified in SP 800-186: Recommendations for Discrete Logarithm-based Cryptography: Elliptic Curve Domain Parameters.

Also known as secp521r1 (SECG).

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

License

All crates licensed under either of

• Apache License, Version 2.0
• MIT license

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.

serde support

When the serde feature of this crate is enabled, Serialize and Deserialize are impl’d for the following types:

• AffinePoint
• Scalar

Please see type-specific documentation for more information.

Re-exports

• pub use elliptic_curve;
• pub use elliptic_curve::pkcs8;

Modules

• ecdhecdh
  Elliptic Curve Diffie-Hellman (Ephemeral) Support.
• ecdsaecdsa-core
  Elliptic Curve Digital Signature Algorithm (ECDSA)
• test_vectorstest-vectors
  secp521r1 test vectors.

Structs

• NistP521
  NIST P-521 elliptic curve.
• Scalararithmetic
  Scalars are elements in the finite field modulo n.

Type Aliases

• AffinePointarithmetic
  Elliptic curve point in affine coordinates.
• CompressedPoint
  Compressed SEC1-encoded NIST P-521 curve point.
• EncodedPoint
  NIST P-521 SEC1 encoded point.
• FieldBytes
  NIST P-521 field element serialized as bytes.
• NonZeroScalararithmetic
  Non-zero NIST P-521 scalar field element.
• ProjectivePointarithmetic
  Elliptic curve point in projective coordinates.
• PublicKeyarithmetic
  NIST P-521 public key.
• SecretKey
  NIST P-521 secret key.
• U576
  576-bit unsigned big integer.