Module p256 

NIST P-256 (secp256r1, prime256v1).

Three groups of types, each served by its own driver:

• Scalar and Point: arithmetic, via driver::P256Arith.
• SecretKey, PublicKey and SharedSecret: ECDH, via driver::P256Ecdh.
• SigningKey, VerifyingKey and Signature: ECDSA over SHA-256 digests, via driver::P256Ecdsa.

Example

use embassy_crypto::p256::{SecretKey, PublicKey};

let mine = SecretKey::generate()?;
let peer = PublicKey::from_sec1(&peer_bytes)?;
let shared = mine.diffie_hellman(&peer)?;
// feed shared.as_bytes() to a KDF

Structs

Point

A point on the curve, the point at infinity included.

PublicKey

An ECDH public key: a point on the curve.

Scalar

A scalar: an integer modulo the curve order n.

SecretKey

An ECDH private key: a nonzero scalar.

SharedSecret

An ECDH shared secret: the X coordinate of the shared point.

Signature

An ECDSA signature (r, s).

SigningKey

An ECDSA signing key: a nonzero scalar.

VerifyingKey

An ECDSA verifying key: a point on the curve.

Constants

FIELD_SIZE

Size of a field element, scalar and coordinate, in bytes.

ORDER

The curve order n, big-endian.