simplewallet: add set_tx_key for importing tx keys from 3rd party wallets

src/simplewallet/simplewallet.cpp

@@ -2298,6 +2298,10 @@ simple_wallet::simple_wallet()
                            boost::bind(&simple_wallet::get_tx_key, this, _1),
                            tr("get_tx_key <txid>"),
                            tr("Get the transaction key (r) for a given <txid>."));
+  m_cmd_binder.set_handler("set_tx_key",
+                           boost::bind(&simple_wallet::set_tx_key, this, _1),
+                           tr("set_tx_key <txid> <tx_key>"),
+                           tr("Set the transaction key (r) for a given <txid> in case the tx was made by some other device or 3rd party wallet."));
   m_cmd_binder.set_handler("check_tx_key",
                            boost::bind(&simple_wallet::check_tx_key, this, _1),
                            tr("check_tx_key <txid> <txkey> <address>"),
@@ -5765,6 +5769,64 @@ bool simple_wallet::get_tx_key(const std::vector<std::string> &args_)
   }
 }
 //----------------------------------------------------------------------------------------------------
+bool simple_wallet::set_tx_key(const std::vector<std::string> &args_)
+{
+  std::vector<std::string> local_args = args_;
+
+  if(local_args.size() != 2) {
+    fail_msg_writer() << tr("usage: set_tx_key <txid> <tx_key>");
+    return true;
+  }
+
+  crypto::hash txid;
+  if (!epee::string_tools::hex_to_pod(local_args[0], txid))
+  {
+    fail_msg_writer() << tr("failed to parse txid");
+    return true;
+  }
+
+  crypto::secret_key tx_key;
+  std::vector<crypto::secret_key> additional_tx_keys;
+  try
+  {
+    if (!epee::string_tools::hex_to_pod(local_args[1].substr(0, 64), tx_key))
+    {
+      fail_msg_writer() << tr("failed to parse tx_key");
+      return true;
+    }
+    while(true)
+    {
+      local_args[1] = local_args[1].substr(64);
+      if (local_args[1].empty())
+        break;
+      additional_tx_keys.resize(additional_tx_keys.size() + 1);
+      if (!epee::string_tools::hex_to_pod(local_args[1].substr(0, 64), additional_tx_keys.back()))
+      {
+        fail_msg_writer() << tr("failed to parse tx_key");
+        return true;
+      }
+    }
+  }
+  catch (const std::out_of_range &e)
+  {
+    fail_msg_writer() << tr("failed to parse tx_key");
+    return true;
+  }
+
+  LOCK_IDLE_SCOPE();
+
+  try
+  {
+    m_wallet->set_tx_key(txid, tx_key, additional_tx_keys);
+    success_msg_writer() << tr("Tx key successfully stored.");
+  }
+  catch (const std::exception &e)
+  {
+    fail_msg_writer() << tr("Failed to store tx key: ") << e.what();
+  }
+  return true;
+}
+//----------------------------------------------------------------------------------------------------
 bool simple_wallet::get_tx_proof(const std::vector<std::string> &args)
 {
   if (m_wallet->key_on_device())

src/simplewallet/simplewallet.h

@@ -176,6 +176,7 @@ namespace cryptonote
     bool rescan_spent(const std::vector<std::string> &args);
     bool set_log(const std::vector<std::string> &args);
     bool get_tx_key(const std::vector<std::string> &args);
+    bool set_tx_key(const std::vector<std::string> &args);
     bool check_tx_key(const std::vector<std::string> &args);
     bool get_tx_proof(const std::vector<std::string> &args);
     bool check_tx_proof(const std::vector<std::string> &args);

src/wallet/wallet2.cpp

@@ -8583,6 +8583,54 @@ bool wallet2::get_tx_key(const crypto::hash &txid, crypto::secret_key &tx_key, s
   return true;
 }
 //----------------------------------------------------------------------------------------------------
+void wallet2::set_tx_key(const crypto::hash &txid, const crypto::secret_key &tx_key, const std::vector<crypto::secret_key> &additional_tx_keys)
+{
+  // fetch tx from daemon and check if secret keys agree with corresponding public keys
+  COMMAND_RPC_GET_TRANSACTIONS::request req = AUTO_VAL_INIT(req);
+  req.txs_hashes.push_back(epee::string_tools::pod_to_hex(txid));
+  req.decode_as_json = false;
+  req.prune = false;
+  COMMAND_RPC_GET_TRANSACTIONS::response res = AUTO_VAL_INIT(res);
+  bool r;
+  {
+    const boost::lock_guard<boost::mutex> lock{m_daemon_rpc_mutex}; 
+    r = epee::net_utils::invoke_http_json("/gettransactions", req, res, m_http_client, rpc_timeout);
+  }
+  THROW_WALLET_EXCEPTION_IF(!r, error::no_connection_to_daemon, "gettransactions");
+  THROW_WALLET_EXCEPTION_IF(res.status == CORE_RPC_STATUS_BUSY, error::daemon_busy, "gettransactions");
+  THROW_WALLET_EXCEPTION_IF(res.status != CORE_RPC_STATUS_OK, error::wallet_internal_error, "gettransactions");
+  THROW_WALLET_EXCEPTION_IF(res.txs.size() != 1, error::wallet_internal_error,
+    "daemon returned wrong response for gettransactions, wrong txs count = " +
+    std::to_string(res.txs.size()) + ", expected 1");
+  cryptonote::blobdata bd;
+  THROW_WALLET_EXCEPTION_IF(!epee::string_tools::parse_hexstr_to_binbuff(res.txs[0].as_hex, bd), error::wallet_internal_error, "failed to parse tx from hexstr");
+  cryptonote::transaction tx;
+  crypto::hash tx_hash, tx_prefix_hash;
+  THROW_WALLET_EXCEPTION_IF(!cryptonote::parse_and_validate_tx_from_blob(bd, tx, tx_hash, tx_prefix_hash), error::wallet_internal_error, "failed to parse tx from blob");
+  THROW_WALLET_EXCEPTION_IF(tx_hash != txid, error::wallet_internal_error, "txid mismatch");
+  std::vector<tx_extra_field> tx_extra_fields;
+  THROW_WALLET_EXCEPTION_IF(!parse_tx_extra(tx.extra, tx_extra_fields), error::wallet_internal_error, "Transaction extra has unsupported format");
+  tx_extra_pub_key pub_key_field;
+  bool found = false;
+  size_t index = 0;
+  while (find_tx_extra_field_by_type(tx_extra_fields, pub_key_field, index++))
+  {
+    crypto::public_key calculated_pub_key;
+    crypto::secret_key_to_public_key(tx_key, calculated_pub_key);
+    if (calculated_pub_key == pub_key_field.pub_key)
+    {
+      found = true;
+      break;
+    }
+  }
+  THROW_WALLET_EXCEPTION_IF(!found, error::wallet_internal_error, "Given tx secret key doesn't agree with the tx public key in the blockchain");
+  tx_extra_additional_pub_keys additional_tx_pub_keys;
+  find_tx_extra_field_by_type(tx_extra_fields, additional_tx_pub_keys);
+  THROW_WALLET_EXCEPTION_IF(additional_tx_keys.size() != additional_tx_pub_keys.data.size(), error::wallet_internal_error, "The number of additional tx secret keys doesn't agree with the number of additional tx public keys in the blockchain" );
+  m_tx_keys.insert(std::make_pair(txid, tx_key));
+  m_additional_tx_keys.insert(std::make_pair(txid, additional_tx_keys));
+}
+//----------------------------------------------------------------------------------------------------
 std::string wallet2::get_spend_proof(const crypto::hash &txid, const std::string &message)
 {
   THROW_WALLET_EXCEPTION_IF(m_watch_only, error::wallet_internal_error,

src/wallet/wallet2.h

@@ -931,6 +931,7 @@ namespace tools
     void confirm_non_default_ring_size(bool always) { m_confirm_non_default_ring_size = always; }
 
     bool get_tx_key(const crypto::hash &txid, crypto::secret_key &tx_key, std::vector<crypto::secret_key> &additional_tx_keys) const;
+    void set_tx_key(const crypto::hash &txid, const crypto::secret_key &tx_key, const std::vector<crypto::secret_key> &additional_tx_keys);
     void check_tx_key(const crypto::hash &txid, const crypto::secret_key &tx_key, const std::vector<crypto::secret_key> &additional_tx_keys, const cryptonote::account_public_address &address, uint64_t &received, bool &in_pool, uint64_t &confirmations);
     void check_tx_key_helper(const crypto::hash &txid, const crypto::key_derivation &derivation, const std::vector<crypto::key_derivation> &additional_derivations, const cryptonote::account_public_address &address, uint64_t &received, bool &in_pool, uint64_t &confirmations);
     std::string get_tx_proof(const crypto::hash &txid, const cryptonote::account_public_address &address, bool is_subaddress, const std::string &message);