Module p256::ecdh [−][src]
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 p256::{EncodedPoint, PublicKey, ecdh::EphemeralSecret}; use rand_core::OsRng; // requires 'getrandom' feature // Alice let alice_secret = EphemeralSecret::random(&mut OsRng); let alice_pk_bytes = EncodedPoint::from(alice_secret.public_key()); // Bob let bob_secret = EphemeralSecret::random(&mut OsRng); let bob_pk_bytes = EncodedPoint::from(bob_secret.public_key()); // Alice decodes Bob's serialized public key and computes a shared secret from it let bob_public = PublicKey::from_sec1_bytes(bob_pk_bytes.as_ref()) .expect("bob's public key is invalid!"); // In real usage, don't panic, handle this! let alice_shared = alice_secret.diffie_hellman(&bob_public); // Bob deocdes Alice's serialized public key and computes the same shared secret let alice_public = PublicKey::from_sec1_bytes(alice_pk_bytes.as_ref()) .expect("alice's public key is invalid!"); // In real usage, don't panic, handle this! let bob_shared = bob_secret.diffie_hellman(&alice_public); // Both participants arrive on the same shared secret assert_eq!(alice_shared.as_bytes(), bob_shared.as_bytes());
Type Definitions
EphemeralSecret | NIST P-256 Ephemeral Diffie-Hellman Secret. |
SharedSecret | Shared secret value computed via ECDH key agreement. |