Add tests for the premise of the Schnorr contract to the Schnorr crate

networks/ethereum/schnorr/src/tests/mod.rs

@@ -0,0 +1,112 @@
+use std::sync::Arc;
+
+use rand_core::{RngCore, OsRng};
+
+use group::ff::{Field, PrimeField};
+use k256::{Scalar, ProjectivePoint};
+
+use alloy_core::primitives::Address;
+use alloy_sol_types::SolCall;
+
+use alloy_simple_request_transport::SimpleRequest;
+use alloy_rpc_types_eth::{TransactionInput, TransactionRequest};
+use alloy_rpc_client::ClientBuilder;
+use alloy_provider::{Provider, RootProvider};
+
+use alloy_node_bindings::{Anvil, AnvilInstance};
+
+use crate::{PublicKey, Signature};
+
+mod premise;
+
+#[expect(warnings)]
+#[expect(needless_pass_by_value)]
+#[expect(clippy::all)]
+#[expect(clippy::ignored_unit_patterns)]
+#[expect(clippy::redundant_closure_for_method_calls)]
+mod abi {
+  alloy_sol_types::sol!("contracts/tests/Schnorr.sol");
+  pub(crate) use TestSchnorr::*;
+}
+
+async fn setup_test() -> (AnvilInstance, Arc<RootProvider<SimpleRequest>>, Address) {
+  let anvil = Anvil::new().spawn();
+
+  let provider = Arc::new(RootProvider::new(
+    ClientBuilder::default().transport(SimpleRequest::new(anvil.endpoint()), true),
+  ));
+
+  let mut address = [0; 20];
+  OsRng.fill_bytes(&mut address);
+  let address = Address::from(address);
+  let _: () = provider
+    .raw_request(
+      "anvil_setCode".into(),
+      [
+        address.to_string(),
+        include_str!(concat!(
+          env!("OUT_DIR"),
+          "/ethereum-schnorr-contract/TestSchnorr.bin-runtime"
+        ))
+        .to_string(),
+      ],
+    )
+    .await
+    .unwrap();
+
+  (anvil, provider, address)
+}
+
+async fn call_verify(
+  provider: &RootProvider<SimpleRequest>,
+  address: Address,
+  public_key: &PublicKey,
+  message: &[u8],
+  signature: &Signature,
+) -> bool {
+  let public_key: [u8; 32] = public_key.eth_repr();
+  let c_bytes: [u8; 32] = signature.c().to_repr().into();
+  let s_bytes: [u8; 32] = signature.s().to_repr().into();
+  let call = TransactionRequest::default().to(address).input(TransactionInput::new(
+    abi::verifyCall::new((
+      public_key.into(),
+      message.to_vec().into(),
+      c_bytes.into(),
+      s_bytes.into(),
+    ))
+    .abi_encode()
+    .into(),
+  ));
+  let bytes = provider.call(&call).await.unwrap();
+  let res = abi::verifyCall::abi_decode_returns(&bytes, true).unwrap();
+
+  res._0
+}
+
+#[tokio::test]
+async fn test_verify() {
+  let (_anvil, provider, address) = setup_test().await;
+
+  for _ in 0 .. 100 {
+    let (key, public_key) = loop {
+      let key = Scalar::random(&mut OsRng);
+      if let Some(public_key) = PublicKey::new(ProjectivePoint::GENERATOR * key) {
+        break (key, public_key);
+      }
+    };
+
+    let nonce = Scalar::random(&mut OsRng);
+    let mut message = vec![0; 1 + usize::try_from(OsRng.next_u32() % 256).unwrap()];
+    OsRng.fill_bytes(&mut message);
+
+    let c = Signature::challenge(ProjectivePoint::GENERATOR * nonce, &public_key, &message);
+    let s = nonce + (c * key);
+
+    let sig = Signature::new(c, s);
+    assert!(sig.verify(&public_key, &message));
+    assert!(call_verify(&provider, address, &public_key, &message, &sig).await);
+    // Mutate the message and make sure the signature now fails to verify
+    message[0] = message[0].wrapping_add(1);
+    assert!(!call_verify(&provider, address, &public_key, &message, &sig).await);
+  }
+}