[Feat] For prover 4.6.1 (#1742)

crates/libzkp/src/lib.rs

@@ -46,6 +46,47 @@ pub fn checkout_chunk_task(
     Ok(ret)
 }
 
+/// Convert the universal task json into compatible form for old prover
+pub fn univ_task_compatibility_fix(task_json: &str) -> eyre::Result<String> {
+    use scroll_zkvm_types::proof::VmInternalStarkProof;
+
+    let task: tasks::ProvingTask = serde_json::from_str(task_json)?;
+    let aggregated_proofs: Vec<VmInternalStarkProof> = task
+        .aggregated_proofs
+        .into_iter()
+        .map(|proof| VmInternalStarkProof {
+            proofs: proof.proofs,
+            public_values: proof.public_values,
+        })
+        .collect();
+
+    #[derive(Serialize)]
+    struct CompatibleProvingTask {
+        /// seralized witness which should be written into stdin first
+        pub serialized_witness: Vec<Vec<u8>>,
+        /// aggregated proof carried by babybear fields, should be written into stdin
+        /// followed `serialized_witness`
+        pub aggregated_proofs: Vec<VmInternalStarkProof>,
+        /// Fork name specify
+        pub fork_name: String,
+        /// The vk of app which is expcted to prove this task
+        pub vk: Vec<u8>,
+        /// An identifier assigned by coordinator, it should be kept identify for the
+        /// same task (for example, using chunk, batch and bundle hashes)
+        pub identifier: String,
+    }
+
+    let compatible_u_task = CompatibleProvingTask {
+        serialized_witness: task.serialized_witness,
+        aggregated_proofs,
+        fork_name: task.fork_name,
+        vk: task.vk,
+        identifier: task.identifier,
+    };
+
+    Ok(serde_json::to_string(&compatible_u_task)?)
+}
+
 /// Generate required staff for proving tasks
 /// return (pi_hash, metadata, task)
 pub fn gen_universal_task(