4 files changed, 23 insertions, 5 deletions
diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index 9b3e7e8b4..48b8bbf7e 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -11777,13 +11777,27 @@ void wallet2::set_account_tag_description(const std::string& tag, const std::str
   m_account_tags.first[tag] = description;
 }
 
-std::string wallet2::sign(const std::string &data) const
+std::string wallet2::sign(const std::string &data, cryptonote::subaddress_index index) const
 {
   crypto::hash hash;
   crypto::cn_fast_hash(data.data(), data.size(), hash);
   const cryptonote::account_keys &keys = m_account.get_keys();
   crypto::signature signature;
-  crypto::generate_signature(hash, keys.m_account_address.m_spend_public_key, keys.m_spend_secret_key, signature);
+  crypto::secret_key skey;
+  crypto::public_key pkey;
+  if (index.is_zero())
+  {
+    skey = keys.m_spend_secret_key;
+    pkey = keys.m_account_address.m_spend_public_key;
+  }
+  else
+  {
+    skey = keys.m_spend_secret_key;
+    crypto::secret_key m = m_account.get_device().get_subaddress_secret_key(keys.m_view_secret_key, index);
+    sc_add((unsigned char*)&skey, (unsigned char*)&m, (unsigned char*)&skey);
+    secret_key_to_public_key(skey, pkey);
+  }
+  crypto::generate_signature(hash, pkey, skey, signature);
   return std::string("SigV1") + tools::base58::encode(std::string((const char *)&signature, sizeof(signature)));
 }
 
diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index 640565a4e..38e3afd69 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -1182,7 +1182,7 @@ private:
      */
     void set_account_tag_description(const std::string& tag, const std::string& description);
 
-    std::string sign(const std::string &data) const;
+    std::string sign(const std::string &data, cryptonote::subaddress_index index = {0, 0}) const;
     bool verify(const std::string &data, const cryptonote::account_public_address &address, const std::string &signature) const;
 
     /*!
diff --git a/src/wallet/wallet_rpc_server.cpp b/src/wallet/wallet_rpc_server.cpp
index ec21b2897..b5b572bc8 100644
--- a/src/wallet/wallet_rpc_server.cpp
+++ b/src/wallet/wallet_rpc_server.cpp
@@ -1943,7 +1943,7 @@ namespace tools
       return false;
     }
 
-    res.signature = m_wallet->sign(req.data);
+    res.signature = m_wallet->sign(req.data, {req.account_index, req.address_index});
     return true;
   }
   //------------------------------------------------------------------------------------------------------------------------------
diff --git a/src/wallet/wallet_rpc_server_commands_defs.h b/src/wallet/wallet_rpc_server_commands_defs.h
index 0c86f404d..c823417eb 100644
--- a/src/wallet/wallet_rpc_server_commands_defs.h
+++ b/src/wallet/wallet_rpc_server_commands_defs.h
@@ -1591,9 +1591,13 @@ namespace wallet_rpc
     struct request_t
     {
       std::string data;
+      uint32_t account_index;
+      uint32_t address_index;
 
       BEGIN_KV_SERIALIZE_MAP()
-        KV_SERIALIZE(data);
+        KV_SERIALIZE(data)
+        KV_SERIALIZE_OPT(account_index, 0u)
+        KV_SERIALIZE_OPT(address_index, 0u)
       END_KV_SERIALIZE_MAP()
     };
     typedef epee::misc_utils::struct_init<request_t> request;