wallet_rpc_server: optionally return tx keys in sign_transfer

src/wallet/wallet2.cpp

@@ -5607,6 +5607,10 @@ bool wallet2::sign_tx(unsigned_tx_set &exported_txs, std::vector<wallet2::pendin
     ptx.construction_data = sd;
 
     txs.push_back(ptx);
+
+    // add tx keys only to ptx
+    txs.back().tx_key = tx_key;
+    txs.back().additional_tx_keys = additional_tx_keys;
   }
 
   // add key images

src/wallet/wallet_rpc_server.cpp

@@ -981,6 +981,8 @@ namespace tools
     for (auto &ptx: ptxs)
     {
       res.tx_hash_list.push_back(epee::string_tools::pod_to_hex(cryptonote::get_transaction_hash(ptx.tx)));
+      if (req.get_tx_keys)
+        res.tx_key_list.push_back(epee::string_tools::pod_to_hex(ptx.tx_key));
     }
 
     if (req.export_raw)

src/wallet/wallet_rpc_server_commands_defs.h

@@ -537,10 +537,12 @@ namespace wallet_rpc
     {
       std::string unsigned_txset;
       bool export_raw;
+      bool get_tx_keys;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(unsigned_txset)
         KV_SERIALIZE_OPT(export_raw, false)
+        KV_SERIALIZE_OPT(get_tx_keys, false)
       END_KV_SERIALIZE_MAP()
     };
 
@@ -549,11 +551,13 @@ namespace wallet_rpc
       std::string signed_txset;
       std::list<std::string> tx_hash_list;
       std::list<std::string> tx_raw_list;
+      std::list<std::string> tx_key_list;
 
       BEGIN_KV_SERIALIZE_MAP()
         KV_SERIALIZE(signed_txset)
         KV_SERIALIZE(tx_hash_list)
         KV_SERIALIZE(tx_raw_list)
+        KV_SERIALIZE(tx_key_list)
       END_KV_SERIALIZE_MAP()
     };
   };