winternitz

winternitz is a small crate implementing a quantum-resistant one-time signature scheme, the LDWM_SHA256_M20_W8 variant of LDWM (but not MTS) as described in https://tools.ietf.org/html/draft-mcgrew-hash-sigs-02.

Usage

Each private key may only be used to sign ONE message. Signing multiple messages with a single key could reveal your private key data.

extern crate winternitz;
extern crate rand;

use rand::{thread_rng, RngCore};

fn main() {
  // Fill up the space of a new private key with entropy.
  let mut privkey = [0; winternitz::PRIVKEY_SIZE];
  thread_rng().try_fill_bytes(&mut privkey).unwrap();

  // Generate your public key from your private key.
  let mut pubkey = [0; winternitz::PUBKEY_SIZE];
  winternitz::derive_pubkey(&privkey, &mut pubkey).unwrap();

  // Sign a message.
  let msg = b"squeamish ossifrage";
  let mut sig = [0; winternitz::SIG_SIZE];
  winternitz::sign(&privkey, msg, &mut sig).unwrap();

  // Verify a signature.
  assert!(winternitz::verify(&pubkey, msg, &sig).unwrap());
}