wallet: allow message sign/verify for subaddresses

src/simplewallet/simplewallet.cpp

@@ -214,7 +214,7 @@ namespace
   const char* USAGE_GET_TX_NOTE("get_tx_note <txid>");
   const char* USAGE_GET_DESCRIPTION("get_description");
   const char* USAGE_SET_DESCRIPTION("set_description [free text note]");
-  const char* USAGE_SIGN("sign <filename>");
+  const char* USAGE_SIGN("sign [<account_index>,<address_index>] <filename>");
   const char* USAGE_VERIFY("verify <filename> <address> <signature>");
   const char* USAGE_EXPORT_KEY_IMAGES("export_key_images [all] <filename>");
   const char* USAGE_IMPORT_KEY_IMAGES("import_key_images <filename>");
@@ -3356,7 +3356,7 @@ simple_wallet::simple_wallet()
   m_cmd_binder.set_handler("sign",
                            boost::bind(&simple_wallet::on_command, this, &simple_wallet::sign, _1),
                            tr(USAGE_SIGN),
-                           tr("Sign the contents of a file."));
+                           tr("Sign the contents of a file with the given subaddress (or the main address if not specified)"));
   m_cmd_binder.set_handler("verify",
                            boost::bind(&simple_wallet::on_command, this, &simple_wallet::verify, _1),
                            tr(USAGE_VERIFY),
@@ -9593,7 +9593,7 @@ bool simple_wallet::sign(const std::vector<std::string> &args)
     fail_msg_writer() << tr("command not supported by HW wallet");
     return true;
   }
-  if (args.size() != 1)
+  if (args.size() != 1 && args.size() != 2)
   {
     PRINT_USAGE(USAGE_SIGN);
     return true;
@@ -9609,7 +9609,20 @@ bool simple_wallet::sign(const std::vector<std::string> &args)
     return true;
   }
 
-  std::string filename = args[0];
+  subaddress_index index{0, 0};
+  if (args.size() == 2)
+  {
+    unsigned int a, b;
+    if (sscanf(args[0].c_str(), "%u,%u", &a, &b) != 2)
+    {
+      fail_msg_writer() << tr("Invalid subaddress index format");
+      return true;
+    }
+    index.major = a;
+    index.minor = b;
+  }
+
+  const std::string &filename = args.back();
   std::string data;
   bool r = m_wallet->load_from_file(filename, data);
   if (!r)
@@ -9620,7 +9633,7 @@ bool simple_wallet::sign(const std::vector<std::string> &args)
 
   SCOPED_WALLET_UNLOCK();
 
-  std::string signature = m_wallet->sign(data);
+  std::string signature = m_wallet->sign(data, index);
   success_msg_writer() << signature;
   return true;
 }

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)));
 }
 

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;
 
     /*!

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;
   }
   //------------------------------------------------------------------------------------------------------------------------------

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;

tests/functional_tests/sign_message.py

@@ -43,7 +43,8 @@ from framework.wallet import Wallet
 class MessageSigningTest():
     def run_test(self):
       self.create()
-      self.check_signing()
+      self.check_signing(False)
+      self.check_signing(True)
 
     def create(self):
         print('Creating wallets')
@@ -65,20 +66,34 @@ class MessageSigningTest():
             assert res.address == self.address[i]
             assert res.seed == seeds[i]
 
-    def check_signing(self):
+    def check_signing(self, subaddress):
-        print('Signing/verifing messages')
+        print('Signing/verifing messages with ' + ('subaddress' if subaddress else 'standard address'))
         messages = ['foo', '']
+        if subaddress:
+            address = []
+            for i in range(2):
+                res = self.wallet[i].create_account()
+                if i == 0:
+                    account_index = res.account_index
+                res = self.wallet[i].create_address(account_index = account_index)
+                if i == 0:
+                    address_index = res.address_index
+                address.append(res.address)
+        else:
+            address = [self.address[0], self.address[1]]
+            account_index = 0
+            address_index = 0
         for message in messages:
-            res = self.wallet[0].sign(message)
+            res = self.wallet[0].sign(message, account_index = account_index, address_index = address_index)
             signature = res.signature
             for i in range(2):
-                res = self.wallet[i].verify(message, self.address[0], signature)
+                res = self.wallet[i].verify(message, address[0], signature)
                 assert res.good
-                res = self.wallet[i].verify('different', self.address[0], signature)
+                res = self.wallet[i].verify('different', address[0], signature)
                 assert not res.good
-                res = self.wallet[i].verify(message, self.address[1], signature)
+                res = self.wallet[i].verify(message, address[1], signature)
                 assert not res.good
-                res = self.wallet[i].verify(message, self.address[0], signature + 'x')
+                res = self.wallet[i].verify(message, address[0], signature + 'x')
                 assert not res.good
 
 if __name__ == '__main__':

utils/python-rpc/framework/wallet.py

@@ -705,11 +705,13 @@ class Wallet(object):
         }
         return self.rpc.send_json_rpc_request(check_reserve_proof)
 
-    def sign(self, data):
+    def sign(self, data, account_index = 0, address_index = 0):
         sign = {
             'method': 'sign',
             'params' : {
                 'data': data,
+                'account_index': account_index,
+                'address_index': address_index,
             },
             'jsonrpc': '2.0', 
             'id': '0'