Crate csidh

CSIDH algorithm implementation

Pure Rust implementation of the CSIDH cryptographic algorithm for secret key exchange.

As of now, only CSIDH-512 is available.

Example

An example using CSIDH-512 as defined in Castryck, W., Lange, T., Martindale, C., Panny, L., Renes, J.: CSIDH: An efficient post-quantum commutative group action. In: Peyrin, T., Galbraith, S. (eds.) ASIACRYPT 2018, LNCS 11274. pp. 395–427. Springer (2018):

use csidh::{CsidhParams, PrivateKey, PublicKey, SharedSecret};

let params = CsidhParams::CSIDH_512;

// Alice
let alice_path = [
    8, 2, 9, 3, 3, 0, 7, 2, 0, 8, 1, 9, 9, 4, 0, 10, 6, 3, 10, 7, 2, 3, 1, 4, 5, 3, 9, 10, 9,
    3, 8, 5, 1, 10, 2, 4, 2, 10, 1, 1, 10, 8, 0, 9, 1, 8, 7, 6, 10, 9, 9, 4, 10, 6, 4, 4, 2,
    3, 5, 5, 5, 3, 0, 9, 6, 9, 8, 5, 5, 9, 2, 0, 3, 6,
];
let alice_private_key = PrivateKey::new(params, alice_path);
let alice_public_key = PublicKey::from(alice_private_key);

// Bob
let bob_path = [
    1, 2, 0, 6, 2, 1, 2, 6, 4, 3, 10, 1, 4, 0, 1, 7, 5, 6, 9, 10, 8, 9, 7, 5, 4, 7, 10, 10, 5,
    6, 5, 2, 1, 4, 0, 6, 0, 3, 8, 7, 0, 10, 0, 3, 0, 3, 6, 9, 2, 3, 4, 4, 3, 3, 0, 10, 10, 2,
    1, 4, 8, 10, 6, 0, 7, 1, 2, 7, 2, 0, 9, 9, 0, 6,
];
let bob_private_key = PrivateKey::new(params, bob_path);
let bob_public_key = PublicKey::from(bob_private_key);

// Shared secret
let alice_shared_secret = SharedSecret::from(bob_public_key, alice_private_key);
let bob_shared_secret = SharedSecret::from(alice_public_key, bob_private_key);
assert_eq!(alice_shared_secret, bob_shared_secret);

Structs

• CsidhParams
  Parameters of the CSIDH key exchange.
• PrivateKey
  A private key for the CSIDH key exchange.
• PublicKey
  A public key for the CSIDH key exchange.
• SharedSecret
  A shared secret created with the CSIDH key exchange.