Return appropriate RPC error code when key image signature check fails

src/wallet/wallet2.cpp

@@ -10542,7 +10542,7 @@ uint64_t wallet2::import_key_images(const std::vector<std::pair<crypto::key_imag
         + boost::lexical_cast<std::string>(signed_key_images.size()) + ", key image " + epee::string_tools::pod_to_hex(key_image));
 
     THROW_WALLET_EXCEPTION_IF(!crypto::check_ring_signature((const crypto::hash&)key_image, key_image, pkeys, &signature),
-        error::wallet_internal_error, "Signature check failed: input " + boost::lexical_cast<std::string>(n) + "/"
+        error::signature_check_failed, boost::lexical_cast<std::string>(n) + "/"
         + boost::lexical_cast<std::string>(signed_key_images.size()) + ", key image " + epee::string_tools::pod_to_hex(key_image)
         + ", signature " + epee::string_tools::pod_to_hex(signature) + ", pubkey " + epee::string_tools::pod_to_hex(*pkeys[0]));
 

src/wallet/wallet_errors.h

@@ -72,6 +72,7 @@ namespace tools
     //         tx_parse_error
     //         get_tx_pool_error
     //         out_of_hashchain_bounds_error
+    //       signature_check_failed
     //       transfer_error *
     //         get_outs_general_error
     //         not_enough_unlocked_money
@@ -418,6 +419,14 @@ namespace tools
       std::string to_string() const { return refresh_error::to_string(); }
     };
     //----------------------------------------------------------------------------------------------------
+    struct signature_check_failed : public wallet_logic_error
+    {
+      explicit signature_check_failed(std::string&& loc, const std::string& message)
+        : wallet_logic_error(std::move(loc), "Signature check failed " + message)
+      {
+      }
+    };
+    //----------------------------------------------------------------------------------------------------
     struct transfer_error : public wallet_logic_error
     {
     protected:

src/wallet/wallet_rpc_server.cpp

@@ -2906,6 +2906,11 @@ namespace tools
       er.code = WALLET_RPC_ERROR_CODE_ADDRESS_INDEX_OUT_OF_BOUNDS;
       er.message = e.what();
     }
+    catch (const error::signature_check_failed& e)
+    {
+        er.code = WALLET_RPC_ERROR_CODE_WRONG_SIGNATURE;
+        er.message = e.what();
+    }
     catch (const std::exception& e)
     {
       er.code = default_error_code;