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New Native Operation PublicKeyOf (#355)

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* wrote some initial code

* added way to input private key into circuit

* TypedValue::SecretKey hashed as 10 32-bit limbs

* Check PublicKeyOf in Frontend and Middleware

* Diff review

* PR review

* Finish utest

* Fix bounds check

* added giving secret key witness to circuit

* Test & doc improvements

* added private key comparison to circuit and added test cases

* cargo fmt

* Add frontend tests for PublicKeyOf

* Add public_key_of and hash_of to op! macro

* Add ownership check to ticket example

* Group order checking in tests

* More negative test cases at circuit level

* Cleanups after self review

* clippy fixes

* Fixes after merge.  Temporarily remove plonky2 commit hash

* Add a nullifier to the ticket test example

* Test PublicKeyOf with a real prover (not mock)

* plonky-u32 dependency

* feat: optimize operation checks

Skip the circuits that verify operation checks other than None, Copy or
NewEntry for the public statements.  This works because public
statements are created by copying private statements, so we never use
the other operation checks in those slots.

---------

Co-authored-by: Andrew Twyman <artwyman@gmail.com>
Co-authored-by: Eduard S. <eduardsanou@posteo.net>
This commit is contained in:
brian6l 2025-07-28 15:53:01 -07:00 • committed by GitHub
parent 9f8335756c
commit 5b04b2a360
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GPG key ID: B5690EEEBB952194
15 changed files with 958 additions and 76 deletions
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35
src/examples/mod.rs
View file

@ -3,6 +3,7 @@ pub mod custom;
use std::{collections::HashSet, sync::LazyLock};
use custom::eth_dos_batch;
use num::BigUint;
pub static MOCK_VD_SET: LazyLock<VDSet> = LazyLock::new(|| VDSet::new(6, &[]).unwrap());
@ -10,8 +11,8 @@ use crate::{
backends::plonky2::{primitives::ec::schnorr::SecretKey, signedpod::Signer},
frontend::{MainPod, MainPodBuilder, Result, SignedPod, SignedPodBuilder},
middleware::{
containers::Set, CustomPredicateRef, Params, PodSigner, PodType, Predicate, Statement,
StatementArg, TypedValue, VDSet, Value, KEY_SIGNER, KEY_TYPE,
containers::Set, hash_values, CustomPredicateRef, Params, PodSigner, PodType, Predicate,
Statement, StatementArg, TypedValue, VDSet, Value, KEY_SIGNER, KEY_TYPE,
},
op,
};
@ -393,13 +394,17 @@ pub fn great_boy_pod_full_flow() -> Result<(Params, MainPodBuilder)> {
// Tickets
pub const TICKET_OWNER_SECRET_KEY: SecretKey = SecretKey(BigUint::ZERO);
pub fn tickets_sign_pod_builder(params: &Params) -> SignedPodBuilder {
// Create a signed pod with all atomic types (string, int, bool)
let mut builder = SignedPodBuilder::new(params);
builder.insert("eventId", 123);
builder.insert("productId", 456);
builder.insert("attendeeName", "John Doe");
// Removed temporarily to make the example fit in 8 entries.
//builder.insert("attendeeName", "John Doe");
builder.insert("attendeeEmail", "john.doe@example.com");
builder.insert("attendeePublicKey", TICKET_OWNER_SECRET_KEY.public_key());
builder.insert("isConsumed", true);
builder.insert("isRevoked", false);
builder
@ -425,17 +430,31 @@ pub fn tickets_pod_builder(
blacklisted_email_set_value,
(signed_pod, "attendeeEmail")
))?;
// This isn't the most fool-proof way to prove ownership (it requires
// verifier to check pod ID on an anchored key to confirm statement wasn't
// copied), but it's the simplest.
let st_sk = builder.priv_literal(TICKET_OWNER_SECRET_KEY)?;
builder.pub_op(op!(
public_key_of,
(signed_pod, "attendeePublicKey"),
st_sk.clone()
))?;
// Nullifier calculation is public, but based on the private sk.
let external_nullifier = "external nullifier";
let nullifier = hash_values(&[TICKET_OWNER_SECRET_KEY.into(), external_nullifier.into()]);
builder.pub_op(op!(hash_of, nullifier, st_sk, external_nullifier))?;
Ok(builder)
}
pub fn tickets_pod_full_flow() -> Result<MainPodBuilder> {
let params = Params::default();
let vd_set = &*MOCK_VD_SET;
let builder = tickets_sign_pod_builder(&params);
pub fn tickets_pod_full_flow(params: &Params, vd_set: &VDSet) -> Result<MainPodBuilder> {
let builder = tickets_sign_pod_builder(params);
let signed_pod = builder.sign(&Signer(SecretKey(1u32.into()))).unwrap();
tickets_pod_builder(
&params,
params,
vd_set,
&signed_pod,
123,