Code modifications to integrate Ledger HW device into monero-wallet-cli.

The basic approach it to delegate all sensitive data (master key, secret
ephemeral key, key derivation, ....) and related operations to the device.
As device has low memory, it does not keep itself the values
(except for view/spend keys) but once computed there are encrypted (with AES
are equivalent) and return back to monero-wallet-cli. When they need to be
manipulated by the device, they are decrypted on receive.

Moreover, using the client for storing the value in encrypted form limits
the modification in the client code. Those values are transfered from one
C-structure to another one as previously.

The code modification has been done with the wishes to be open to any
other hardware wallet. To achieve that a C++ class hw::Device has been
introduced. Two initial implementations are provided: the "default", which
remaps all calls to initial Monero code, and  the "Ledger", which delegates
all calls to Ledger device.

1 files changed, 40 insertions, 0 deletions

diff --git a/src/cryptonote_basic/account.cpp b/src/cryptonote_basic/account.cpp
index 1b38d99b3..26c823c2a 100644
--- a/src/cryptonote_basic/account.cpp
+++ b/src/cryptonote_basic/account.cpp
@@ -40,6 +40,7 @@ extern "C"
 }
 #include "cryptonote_basic_impl.h"
 #include "cryptonote_format_utils.h"
+#include "device/device.hpp"
 
 #undef MONERO_DEFAULT_LOG_CATEGORY
 #define MONERO_DEFAULT_LOG_CATEGORY "account"
@@ -50,6 +51,17 @@ DISABLE_VS_WARNINGS(4244 4345)
 
   namespace cryptonote
 {
+
+  //-----------------------------------------------------------------
+  hw::device& account_keys::get_device() const  {
+    return *m_device;
+  }
+  //-----------------------------------------------------------------
+  void account_keys::set_device( hw::device &hwdev)  {
+    m_device = &hwdev;
+    MCDEBUG("device", "account_keys::set_device device type: "<<typeid(hwdev).name());
+  }
+
   //-----------------------------------------------------------------
   account_base::account_base()
   {
@@ -116,6 +128,34 @@ DISABLE_VS_WARNINGS(4244 4345)
     if (m_creation_timestamp == (uint64_t)-1) // failure
       m_creation_timestamp = 0; // lowest value
   }
+
+  //-----------------------------------------------------------------
+  void account_base::create_from_device(const std::string &device_name)
+  {
+
+    hw::device &hwdev =  hw::get_device(device_name);
+    m_keys.set_device(hwdev);
+    hwdev.set_name(device_name);
+    MCDEBUG("ledger", "device type: "<<typeid(hwdev).name());
+    hwdev.init();
+    hwdev.connect();
+    hwdev.get_public_address(m_keys.m_account_address);
+    #ifdef DEBUG_HWDEVICE
+    hwdev.get_secret_keys(m_keys.m_view_secret_key, m_keys.m_spend_secret_key);
+    #endif
+    struct tm timestamp = {0};
+    timestamp.tm_year = 2014 - 1900;  // year 2014
+    timestamp.tm_mon = 4 - 1;  // month april
+    timestamp.tm_mday = 15;  // 15th of april
+    timestamp.tm_hour = 0;
+    timestamp.tm_min = 0;
+    timestamp.tm_sec = 0;
+
+    m_creation_timestamp = mktime(&timestamp);
+    if (m_creation_timestamp == (uint64_t)-1) // failure
+      m_creation_timestamp = 0; // lowest value
+  }
+
   //-----------------------------------------------------------------
   void account_base::create_from_viewkey(const cryptonote::account_public_address& address, const crypto::secret_key& viewkey)
   {