most functions prototyped/modified for wallet recovery

src/crypto/crypto.cpp

@@ -50,6 +50,7 @@ namespace crypto {
     return &reinterpret_cast<const unsigned char &>(scalar);
   }
 
+  /* generate a random 32-byte (256-bit) integer and copy it to res */
   static inline void random_scalar(ec_scalar &res) {
     unsigned char tmp[64];
     generate_random_bytes(64, tmp);
@@ -62,6 +63,11 @@ namespace crypto {
     sc_reduce32(&res);
   }
 
+  /* 
+   * generate public and secret keys from a random 256-bit integer
+   * TODO: allow specifiying random value (for wallet recovery)
+   * 
+   */
   void crypto_ops::generate_keys(public_key &pub, secret_key &sec) {
     lock_guard<mutex> lock(random_lock);
     ge_p3 point;

src/crypto/electrum-words.cpp

@@ -0,0 +1,29 @@
+/*
+ * This file and its header file are for translating Electrum-style word lists
+ * into their equivalent byte representations for cross-compatibility with
+ * that method of "backing up" one's wallet keys.
+ */
+
+#include <string>
+#include <map>
+#include "crypto/crypto.h"  // for declaration of crypto::secret_key
+
+#include "crypto/electrum-words.h"
+
+namespace crypto
+{
+  namespace ElectrumWords
+  {
+
+    bool words_to_bytes(const std::string& words, crypto::secret_key& dst)
+    {
+      return false;
+    }
+    bool bytes_to_words(const crypto::secret_key& src, std::string& words)
+    {
+      return false;
+    }
+
+  }  // namespace ElectrumWords
+
+}  // namespace crypto

src/cryptonote_core/account.cpp

@@ -29,7 +29,7 @@ DISABLE_VS_WARNINGS(4244 4345)
     m_keys = account_keys();
   }
   //-----------------------------------------------------------------
-  void account_base::generate()
+  void account_base::generate(const crypto::secret_key& recovery_key, bool recover)
   {
     generate_keys(m_keys.m_account_address.m_spend_public_key, m_keys.m_spend_secret_key);
     generate_keys(m_keys.m_account_address.m_view_public_key, m_keys.m_view_secret_key);

src/cryptonote_core/account.h

@@ -31,7 +31,7 @@ namespace cryptonote
   {
   public:
     account_base();
-    void generate();
+    void generate(const crypto::secret_key& recovery_key, bool recover);
     const account_keys& get_keys() const;
     std::string get_public_address_str();
 

src/simplewallet/simplewallet.cpp

@@ -17,6 +17,8 @@
 #include "rpc/core_rpc_server_commands_defs.h"
 #include "wallet/wallet_rpc_server.h"
 #include "version.h"
+#include "crypto/crypto.h"  // for crypto::secret_key definition
+#include "crypto/electrum-words.h"
 
 #if defined(WIN32)
 #include <crtdbg.h>
@@ -38,6 +40,8 @@ namespace
   const command_line::arg_descriptor<std::string> arg_daemon_address = {"daemon-address", "Use daemon instance at <host>:<port>", ""};
   const command_line::arg_descriptor<std::string> arg_daemon_host = {"daemon-host", "Use daemon instance at host <arg> instead of localhost", ""};
   const command_line::arg_descriptor<std::string> arg_password = {"password", "Wallet password", "", true};
+  const command_line::arg_descriptor<std::string> arg_electrum_seed = {"electrum-seed", "Specify electrum seed for wallet recovery/creation", ""};
+  const command_line::arg_descriptor<bool> arg_recover = {"recover", "Recover wallet using mnemonic generator (e.g. electrum word list)", false};
   const command_line::arg_descriptor<int> arg_daemon_port = {"daemon-port", "Use daemon instance at port <arg> instead of 8081", 0};
   const command_line::arg_descriptor<uint32_t> arg_log_level = {"set_log", "", 0, true};
 
@@ -284,7 +288,24 @@ bool simple_wallet::init(const boost::program_options::variables_map& vm)
 
   if (!m_generate_new.empty())
   {
-    bool r = new_wallet(m_generate_new, pwd_container.password());
+    // check for recover flag.  if present, require electrum word list (only recovery option for now).
+    if (m_recover)
+    {
+      if (m_electrum_seed.empty())
+      {
+        fail_msg_writer() << "specify a recovery parameter (e.g. electrum word list) with the recover option";
+        return false;
+      }
+      else  // verify recovery param (electrum word list) and convert to byte representation
+      {
+        CHECK_AND_ASSERT_MES(
+            crypto::ElectrumWords::words_to_bytes(m_electrum_seed, m_recovery_key),
+            false,
+            "electrum-style word list failed verification"
+        );
+      }
+    }
+    bool r = new_wallet(m_generate_new, pwd_container.password(), m_recovery_key, m_recover);
     CHECK_AND_ASSERT_MES(r, false, "account creation failed");
   }
   else
@@ -311,6 +332,8 @@ void simple_wallet::handle_command_line(const boost::program_options::variables_
   m_daemon_address = command_line::get_arg(vm, arg_daemon_address);
   m_daemon_host    = command_line::get_arg(vm, arg_daemon_host);
   m_daemon_port    = command_line::get_arg(vm, arg_daemon_port);
+  m_electrum_seed  = command_line::get_arg(vm, arg_electrum_seed);
+  m_recover        = command_line::get_arg(vm, arg_recover);
 }
 //----------------------------------------------------------------------------------------------------
 bool simple_wallet::try_connect_to_daemon()
@@ -324,8 +347,14 @@ bool simple_wallet::try_connect_to_daemon()
   }
   return true;
 }
+
+bool simple_wallet::parse_electrum()
+{
+  return false;
+}
+
 //----------------------------------------------------------------------------------------------------
-bool simple_wallet::new_wallet(const string &wallet_file, const std::string& password)
+bool simple_wallet::new_wallet(const string &wallet_file, const std::string& password, const crypto::secret_key& recovery_key, bool recover)
 {
   m_wallet_file = wallet_file;
 
@@ -333,7 +362,7 @@ bool simple_wallet::new_wallet(const string &wallet_file, const std::string& pas
   m_wallet->callback(this);
   try
   {
-    m_wallet->generate(wallet_file, password);
+    m_wallet->generate(wallet_file, password, recovery_key, recover);
     message_writer(epee::log_space::console_color_white, true) << "Generated new wallet: " << m_wallet->get_account().get_public_address_str() << std::endl << "view key: " << string_tools::pod_to_hex(m_wallet->get_account().get_keys().m_view_secret_key);
   }
   catch (const std::exception& e)

src/simplewallet/simplewallet.h

@@ -13,6 +13,7 @@
 #include "wallet/wallet2.h"
 #include "console_handler.h"
 #include "password_container.h"
+#include "crypto/crypto.h"  // for definition of crypto::secret_key
 
 
 namespace cryptonote
@@ -39,7 +40,9 @@ namespace cryptonote
 
     bool run_console_handler();
 
-    bool new_wallet(const std::string &wallet_file, const std::string& password);
+    bool parse_electrum();
+
+    bool new_wallet(const std::string &wallet_file, const std::string& password, const crypto::secret_key& recovery_key = crypto::secret_key(), bool recover = false);
     bool open_wallet(const std::string &wallet_file, const std::string& password);
     bool close_wallet();
 
@@ -125,6 +128,11 @@ namespace cryptonote
     std::string m_generate_new;
     std::string m_import_path;
 
+    std::string m_electrum_seed;  // electrum-style seed parameter
+
+    crypto::secret_key m_recovery_key;  // recovery key (used as random for wallet gen)
+    bool m_recover;  // recover flag
+
     std::string m_daemon_address;
     std::string m_daemon_host;
     int m_daemon_port;

src/wallet/wallet2.cpp

@@ -38,6 +38,7 @@ void do_prepare_file_names(const std::string& file_path, std::string& keys_file,
     keys_file += ".keys";
   }
 }
+
 } //namespace
 
 namespace tools
@@ -435,7 +436,7 @@ void wallet2::load_keys(const std::string& keys_file_name, const std::string& pa
   THROW_WALLET_EXCEPTION_IF(!r, error::invalid_password);
 }
 //----------------------------------------------------------------------------------------------------
-void wallet2::generate(const std::string& wallet_, const std::string& password)
+void wallet2::generate(const std::string& wallet_, const std::string& password, const crypto::secret_key& recovery_param, bool recover)
 {
   clear();
   prepare_file_names(wallet_);
@@ -444,7 +445,8 @@ void wallet2::generate(const std::string& wallet_, const std::string& password)
   THROW_WALLET_EXCEPTION_IF(boost::filesystem::exists(m_wallet_file, ignored_ec), error::file_exists, m_wallet_file);
   THROW_WALLET_EXCEPTION_IF(boost::filesystem::exists(m_keys_file,   ignored_ec), error::file_exists, m_keys_file);
 
-  m_account.generate();
+  m_account.generate(recovery_param, recover);
+
   m_account_public_address = m_account.get_keys().m_account_address;
 
   bool r = store_keys(m_keys_file, password);

src/wallet/wallet2.h

@@ -97,7 +97,7 @@ namespace tools
       END_SERIALIZE()
     };
 
-    void generate(const std::string& wallet, const std::string& password);
+    void generate(const std::string& wallet, const std::string& password, const crypto::secret_key& recovery_param, bool recover = false);
     void load(const std::string& wallet, const std::string& password);
     void store();
     cryptonote::account_base& get_account(){return m_account;}
@@ -227,6 +227,7 @@ namespace boost
 
 namespace tools
 {
+
   namespace detail
   {
     //----------------------------------------------------------------------------------------------------

src/wallet/wallet_errors.h

@@ -188,6 +188,17 @@ namespace tools
 
       std::string to_string() const { return wallet_logic_error::to_string(); }
     };
+
+    //----------------------------------------------------------------------------------------------------
+    struct invalid_pregenerated_random : public wallet_logic_error
+    {
+      explicit invalid_pregenerated_random (std::string&& loc)
+        : wallet_logic_error(std::move(loc), "invalid pregenerated random for wallet creation/recovery")
+      {
+      }
+
+      std::string to_string() const { return wallet_logic_error::to_string(); }
+    };
     //----------------------------------------------------------------------------------------------------
     struct refresh_error : public wallet_logic_error
     {