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feat(backend): Use Schnorr signatures for signed PODs (#236)

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* Implement non-native extension field arithmetic

* Schnorr signature verification (#221)

* Use Schnorr signatures for signed PODs

* add custom gates (#237)

* Clippy

* Formatting

* Apply suggestions from code review

Co-authored-by: Eduard S. <eduardsanou@posteo.net>

* Fix typo

* Fix tests

* Point -> PublicKey

* Remove default nnf_div implementation for clarity

* Code review & edits for clarity

* Remove suspicious mutation

* Simplify computation

* Fix division

* Fix

* Update src/backends/plonky2/primitives/ec/curve.rs

Co-authored-by: Eduard S. <eduardsanou@posteo.net>

* Update src/backends/plonky2/primitives/ec/curve.rs

Co-authored-by: Eduard S. <eduardsanou@posteo.net>

* Fixes

* Add public key to signed POD struct

* Style

* Elaborate on in-circuit field->biguint conversion

* Add missing gates

* Comments

* Add bits to biguint struct

* Comments

* Comment

---------

Co-authored-by: Daniel Gulotta <dgulotta@alum.mit.edu>
Co-authored-by: Eduard S. <eduardsanou@posteo.net>
This commit is contained in:
Ahmad Afuni 2025-06-10 00:24:16 +10:00 • committed by GitHub
parent 541c264586
commit c66506c048
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
22 changed files with 2995 additions and 456 deletions
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10
src/frontend/mod.rs
View file

@ -844,13 +844,9 @@ pub mod tests {
// Check that frontend public statements agree with those
// embedded in a MainPod.
fn check_public_statements(pod: &MainPod) -> Result<()> {
Ok(
std::iter::zip(pod.public_statements.clone(), pod.pod.pub_statements()).try_for_each(
|(fes, s)| {
crate::middleware::Statement::try_from(fes).map(|fes| assert_eq!(fes, s))
},
)?,
)
std::iter::zip(pod.public_statements.clone(), pod.pod.pub_statements())
.for_each(|(fes, s)| assert_eq!(fes, s));
Ok(())
}
// Check that frontend key-values agree with those embedded in a

33
src/frontend/serialization.rs
View file

@ -78,14 +78,19 @@ impl From<SignedPod> for SerializedSignedPod {
impl From<SerializedSignedPod> for SignedPod {
fn from(serialized: SerializedSignedPod) -> Self {
match serialized.pod_type {
SignedPodType::Signed => SignedPod {
pod: Box::new(Plonky2SignedPod {
id: serialized.id,
signature: Plonky2SignedPod::decode_signature(&serialized.proof).unwrap(),
dict: Dictionary::new(serialized.entries.clone()).unwrap(),
}),
kvs: serialized.entries,
},
SignedPodType::Signed => {
let (signer, signature) =
Plonky2SignedPod::decode_proof(&serialized.proof).unwrap();
SignedPod {
pod: Box::new(Plonky2SignedPod {
id: serialized.id,
signer,
signature,
dict: Dictionary::new(serialized.entries.clone()).unwrap(),
}),
kvs: serialized.entries,
}
}
SignedPodType::MockSigned => SignedPod {
pod: Box::new(MockSignedPod::new(
serialized.id,
@ -210,7 +215,7 @@ mod tests {
backends::plonky2::{
mainpod::Prover,
mock::{mainpod::MockProver, signedpod::MockSigner},
primitives::signature::SecretKey,
primitives::ec::schnorr::SecretKey,
signedpod::Signer,
},
examples::{
@ -221,7 +226,7 @@ mod tests {
middleware::{
self,
containers::{Array, Set},
Params, RawValue, TypedValue,
Params, TypedValue,
},
};
@ -309,7 +314,7 @@ mod tests {
#[test]
fn test_signed_pod_serialization() {
let builder = signed_pod_builder();
let mut signer = Signer(SecretKey(RawValue::from(1)));
let mut signer = Signer(SecretKey(1u32.into()));
let pod = builder.sign(&mut signer).unwrap();
let serialized = serde_json::to_string_pretty(&pod).unwrap();
@ -377,11 +382,11 @@ mod tests {
let (gov_id_builder, pay_stub_builder, sanction_list_builder) =
zu_kyc_sign_pod_builders(&params);
let mut signer = Signer(SecretKey(RawValue::from(1)));
let mut signer = Signer(SecretKey(1u32.into()));
let gov_id_pod = gov_id_builder.sign(&mut signer)?;
let mut signer = Signer(SecretKey(RawValue::from(2)));
let mut signer = Signer(SecretKey(2u32.into()));
let pay_stub_pod = pay_stub_builder.sign(&mut signer)?;
let mut signer = Signer(SecretKey(RawValue::from(3)));
let mut signer = Signer(SecretKey(3u32.into()));
let sanction_list_pod = sanction_list_builder.sign(&mut signer)?;
let kyc_builder =
zu_kyc_pod_builder(&params, &gov_id_pod, &pay_stub_pod, &sanction_list_pod)?;