feat(tee): use hex serialization for RPC responses

Following Anton's suggestion, we have switched to hex serialization for
API/RPC requests and responses. Previously, we used default JSON
serialization for Vec<u8>, which resulted in a lengthy comma-separated
list of integers.

This change will make serialization more efficient and reduce the size
of the responses.

Then:
```
curl -X POST\
     -H "Content-Type: application/json" \
     --data '{"jsonrpc": "2.0", "id": 1, "method": "unstable_getTeeProofs", "params": [491882, "Sgx"] }' \
        https://mainnet.era.zksync.io
{"jsonrpc":"2.0","result":[{"attestation":[3,0,2,0,0,0,0,0,10,<dozens of comma-separated integers here>
```

Now:
```
$ curl -X POST \
       -H "Content-Type: application/json" \
       --data '{"jsonrpc": "2.0", "id": 1, "method": "unstable_getTeeProofs", "params": [1, "sgx"] }' \
          http://localhost:3050
{"jsonrpc":"2.0","result":[{"l1BatchNumber":1,"teeType":"sgx","pubkey":"0506070809","signature":"0001020304","proof":"0a0b0c0d0e","provedAt":"2024-09-16T11:53:38.253033Z","attestation":"0403020100"}],"id":1}
```

core/lib/prover_interface/Cargo.toml

@@ -20,7 +20,7 @@ circuit_sequencer_api_1_5_0.workspace = true
 
 serde.workspace = true
 strum = { workspace = true, features = ["derive"] }
-serde_with = { workspace = true, features = ["base64"] }
+serde_with = { workspace = true, features = ["base64", "hex"] }
 chrono = { workspace = true, features = ["serde"] }
 
 [dev-dependencies]

core/lib/prover_interface/src/api.rs

@@ -2,6 +2,7 @@
 //! This module defines the types used in the API.
 
 use serde::{Deserialize, Serialize};
+use serde_with::{hex::Hex, serde_as};
 use zksync_types::{
     protocol_version::{L1VerifierConfig, ProtocolSemanticVersion},
     tee_types::TeeType,
@@ -71,8 +72,11 @@ pub struct VerifyProofRequest(pub Box<L1BatchProofForL1>);
 #[derive(Debug, PartialEq, Serialize, Deserialize)]
 pub struct SubmitTeeProofRequest(pub Box<L1BatchTeeProofForL1>);
 
+#[serde_as]
 #[derive(Debug, PartialEq, Serialize, Deserialize)]
 pub struct RegisterTeeAttestationRequest {
+    #[serde_as(as = "Hex")]
     pub attestation: Vec<u8>,
+    #[serde_as(as = "Hex")]
     pub pubkey: Vec<u8>,
 }

core/lib/prover_interface/src/outputs.rs

@@ -2,6 +2,7 @@ use core::fmt;
 
 use circuit_sequencer_api_1_5_0::proof::FinalProof;
 use serde::{Deserialize, Serialize};
+use serde_with::{hex::Hex, serde_as};
 use zksync_object_store::{serialize_using_bincode, Bucket, StoredObject};
 use zksync_types::{protocol_version::ProtocolSemanticVersion, tee_types::TeeType, L1BatchNumber};
 
@@ -14,14 +15,18 @@ pub struct L1BatchProofForL1 {
 }
 
 /// A "final" TEE proof that can be sent to the L1 contract.
+#[serde_as]
 #[derive(Clone, PartialEq, Serialize, Deserialize)]
 pub struct L1BatchTeeProofForL1 {
     // signature generated within the TEE enclave, using the privkey corresponding to the pubkey
+    #[serde_as(as = "Hex")]
     pub signature: Vec<u8>,
     // pubkey used for signature verification; each key pair is attested by the TEE attestation
     // stored in the db
+    #[serde_as(as = "Hex")]
     pub pubkey: Vec<u8>,
     // data that was signed
+    #[serde_as(as = "Hex")]
     pub proof: Vec<u8>,
     // type of TEE used for attestation
     pub tee_type: TeeType,

core/lib/prover_interface/tests/job_serialization.rs

@@ -167,9 +167,9 @@ fn test_proof_request_serialization() {
 #[test]
 fn test_tee_proof_request_serialization() {
     let tee_proof_str = r#"{
-        "signature": [ 0, 1, 2, 3, 4 ],
-        "pubkey": [ 5, 6, 7, 8, 9 ],
-        "proof": [ 10, 11, 12, 13, 14 ],
+        "signature": "0001020304",
+        "pubkey": "0506070809",
+        "proof": "0A0B0C0D0E",
         "tee_type": "sgx"
     }"#;
     let tee_proof_result = serde_json::from_str::<SubmitTeeProofRequest>(tee_proof_str).unwrap();

core/lib/types/Cargo.toml

@@ -28,6 +28,7 @@ once_cell.workspace = true
 rlp.workspace = true
 serde.workspace = true
 serde_json.workspace = true
+serde_with = { workspace = true, features = ["hex"] }
 bigdecimal.workspace = true
 strum = { workspace = true, features = ["derive"] }
 thiserror.workspace = true

core/lib/types/src/api/mod.rs

@@ -1,6 +1,7 @@
 use chrono::{DateTime, Utc};
 use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
 use serde_json::Value;
+use serde_with::{hex::Hex, serde_as};
 use strum::Display;
 use zksync_basic_types::{
     tee_types::TeeType,
@@ -784,15 +785,20 @@ pub struct Proof {
     pub storage_proof: Vec<StorageProof>,
 }
 
+#[serde_as]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct TeeProof {
     pub l1_batch_number: L1BatchNumber,
     pub tee_type: Option<TeeType>,
+    #[serde_as(as = "Option<Hex>")]
     pub pubkey: Option<Vec<u8>>,
+    #[serde_as(as = "Option<Hex>")]
     pub signature: Option<Vec<u8>>,
+    #[serde_as(as = "Option<Hex>")]
     pub proof: Option<Vec<u8>>,
     pub proved_at: DateTime<Utc>,
+    #[serde_as(as = "Option<Hex>")]
     pub attestation: Option<Vec<u8>>,
 }
 

core/node/api_server/src/web3/testonly.rs

@@ -182,7 +182,7 @@ async fn spawn_server(
     let (pub_sub_events_sender, pub_sub_events_receiver) = mpsc::unbounded_channel();
 
     let mut namespaces = Namespace::DEFAULT.to_vec();
-    namespaces.extend([Namespace::Debug, Namespace::Snapshots]);
+    namespaces.extend([Namespace::Debug, Namespace::Snapshots, Namespace::Unstable]);
 
     let server_builder = match transport {
         ApiTransportLabel::Http => ApiBuilder::jsonrpsee_backend(api_config, pool).http(0),

core/node/api_server/src/web3/tests/mod.rs

@@ -63,6 +63,7 @@ use crate::web3::testonly::{spawn_http_server, spawn_ws_server};
 mod debug;
 mod filters;
 mod snapshots;
+mod unstable;
 mod vm;
 mod ws;
 

core/node/api_server/src/web3/tests/unstable.rs

@@ -0,0 +1,59 @@
+//! Tests for the `unstable` Web3 namespace.
+
+use zksync_types::tee_types::TeeType;
+use zksync_web3_decl::namespaces::UnstableNamespaceClient;
+
+use super::*;
+
+#[derive(Debug)]
+struct GetTeeProofsTest {}
+
+impl GetTeeProofsTest {
+    fn new() -> Self {
+        Self {}
+    }
+}
+
+#[async_trait]
+impl HttpTest for GetTeeProofsTest {
+    async fn test(
+        &self,
+        client: &DynClient<L2>,
+        pool: &ConnectionPool<Core>,
+    ) -> anyhow::Result<()> {
+        let batch_no = L1BatchNumber(1337);
+        let tee_type = TeeType::Sgx;
+
+        let proof = client.tee_proofs(batch_no, Some(tee_type)).await?;
+        assert!(proof.is_empty());
+
+        let mut storage = pool.connection().await.unwrap();
+        storage
+            .tee_proof_generation_dal()
+            .insert_tee_proof_generation_job(batch_no, tee_type)
+            .await?;
+        let signature = vec![0, 1, 2, 3, 4];
+        let pubkey = vec![5, 6, 7, 8, 9];
+        let proof_vec = vec![10, 11, 12, 13, 14];
+        storage
+            .tee_proof_generation_dal()
+            .save_proof_artifacts_metadata(batch_no, tee_type, &pubkey, &signature, &proof_vec)
+            .await?;
+        let proofs = client.tee_proofs(batch_no, Some(tee_type)).await?;
+        assert!(proofs.len() == 1);
+        let proof = &proofs[0];
+        assert!(proof.l1_batch_number == batch_no);
+        assert!(proof.tee_type == Some(tee_type));
+        assert!(proof.pubkey.as_ref() == Some(&pubkey));
+        assert!(proof.signature.as_ref() == Some(&signature));
+        assert!(proof.proof.as_ref() == Some(&proof_vec));
+        assert!(proof.attestation.is_none());
+
+        Ok(())
+    }
+}
+
+#[tokio::test]
+async fn get_tee_proofs() {
+    test_http_server(GetTeeProofsTest::new()).await;
+}

core/node/proof_data_handler/src/tests.rs

@@ -131,9 +131,9 @@ async fn submit_tee_proof() {
     // send a request to the /tee/submit_proofs endpoint, using a mocked TEE proof
 
     let tee_proof_request_str = r#"{
-        "signature": [ 0, 1, 2, 3, 4 ],
-        "pubkey": [ 5, 6, 7, 8, 9 ],
-        "proof": [ 10, 11, 12, 13, 14 ],
+        "signature": "0001020304",
+        "pubkey": "0506070809",
+        "proof": "0A0B0C0D0E",
         "tee_type": "sgx"
     }"#;
     let tee_proof_request =