1 files changed, 31 insertions, 0 deletions
diff --git a/third_party/rust/prio/tests/backward_compatibility.rs b/third_party/rust/prio/tests/backward_compatibility.rs
new file mode 100644
index 0000000000..55338c10cc
--- /dev/null
+++ b/third_party/rust/prio/tests/backward_compatibility.rs
@@ -0,0 +1,31 @@
+use prio::{test_vector::Priov2TestVector, util::reconstruct_shares};
+
+#[test]
+fn priov2_backward_compatibility() {
+    let test_vector: Priov2TestVector =
+        serde_json::from_str(include_str!("test_vectors/fieldpriov2.json")).unwrap();
+
+    let mut server1 = test_vector.server_1().unwrap();
+    let mut server2 = test_vector.server_2().unwrap();
+
+    for (server_1_share, server_2_share) in test_vector
+        .server_1_shares
+        .iter()
+        .zip(&test_vector.server_2_shares)
+    {
+        let eval_at = server1.choose_eval_at();
+
+        let v1 = server1
+            .generate_verification_message(eval_at, server_1_share)
+            .unwrap();
+        let v2 = server2
+            .generate_verification_message(eval_at, server_2_share)
+            .unwrap();
+
+        assert!(server1.aggregate(server_1_share, &v1, &v2).unwrap());
+        assert!(server2.aggregate(server_2_share, &v1, &v2).unwrap());
+    }
+
+    let reconstructed = reconstruct_shares(server1.total_shares(), server2.total_shares()).unwrap();
+    assert_eq!(reconstructed, test_vector.reference_sum);
+}