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.

```rust 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::PRIVKEYSIZE]; threadrng().tryfillbytes(&mut privkey).unwrap();

// Generate your public key from your private key. let mut pubkey = [0; winternitz::PUBKEYSIZE]; winternitz::derivepubkey(&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()); } ```