[−][src]Module k256::ecdh
This is supported on crate feature
ecdh
only.Elliptic Curve Diffie-Hellman (Ephemeral) Support.
This module contains a high-level interface for performing ephemeral Diffie-Hellman key exchanges using the secp256k1 elliptic curve.
Usage
This usage example is from the perspective of two participants in the exchange, nicknamed "Alice" and "Bob".
use k256::{EncodedPoint, ecdh::EphemeralSecret}; use rand_core::OsRng; // requires 'getrandom' feature // Alice let alice_secret = EphemeralSecret::random(&mut OsRng); let alice_public = EncodedPoint::from(&alice_secret); // Bob let bob_secret = EphemeralSecret::random(&mut OsRng); let bob_public = EncodedPoint::from(&bob_secret); // Alice computes shared secret from Bob's public key let alice_shared = alice_secret.diffie_hellman(&bob_public) .expect("bob's public key is invalid!"); // Bob computes the same shared secret from Alice's public key let bob_shared = bob_secret.diffie_hellman(&alice_public) .expect("alice's public key is invalid!"); // Both participants arrive on the same shared secret assert_eq!(alice_shared.as_bytes(), bob_shared.as_bytes());
Type Definitions
EphemeralSecret | ecdh NIST P-256 Ephemeral Diffie-Hellman Secret. |
SharedSecret | ecdh Shared secret value computed via ECDH key agreement. |