Struct secp256kfun::nonce::NonceChallengeBundle

pub struct NonceChallengeBundle<H, NG> {
    pub challenge_hash: H,
    pub nonce_gen: NG,
}

A struct to keep tagging of a Fiat-Shamir challenge hash and a NonceGen in sync.

This exists because changing the challenge hash without changing nonce generation can be a catastrophic mistake. Any time you are doing the Fiat-Shamir transform you should use this. Internally this follows the structure of BIP-340 for protocol tagging so if you do:

use rand::rngs::ThreadRng;
use secp256kfun::{
    hash::AddTag,
    nonce::{GlobalRng, NonceChallengeBundle, Synthetic},
};
use sha2::Sha256;
let nonce_gen = Synthetic::<Sha256, GlobalRng<ThreadRng>>::default();
let fs = NonceChallengeBundle {
    challenge_hash: Sha256::default(),
    nonce_gen,
}
.add_protocol_tag("BIP340");

You get a perfectly compliant BIP-340 challenge and nonce state.

Fields

challenge_hash: H

The challenge hash for the Fiat-Shamir based scheme.

nonce_gen: NG

The nonce genertor for the Firat-Shamir based scheme.

Trait Implementations

impl<H: Tagged, NG: AddTag> AddTag for NonceChallengeBundle<H, NG>

fn add_protocol_tag(self, tag: &str) -> Self

Tags both the NonceGen and the challenge hash with a protocol specific tag.

fn add_application_tag(self, tag: &str) -> Self

Tags both the NonceGen and the challenge hash with an application specific tag.

impl<H: Clone, NG: Clone> Clone for NonceChallengeBundle<H, NG>

fn clone(&self) -> NonceChallengeBundle<H, NG>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<H: Debug, NG: Debug> Debug for NonceChallengeBundle<H, NG>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<H: Default, NG: Default> Default for NonceChallengeBundle<H, NG>

fn default() -> NonceChallengeBundle<H, NG>

Returns the "default value" for a type.