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, 11 insertions, 1 deletions

diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index 28289842b..127e70a26 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -162,7 +162,7 @@ namespace tools
     //! Just parses variables.
     static std::unique_ptr<wallet2> make_dummy(const boost::program_options::variables_map& vm, const std::function<boost::optional<password_container>(const char *, bool)> &password_prompter);
 
-    static bool verify_password(const std::string& keys_file_name, const epee::wipeable_string& password, bool no_spend_key);
+    static bool verify_password(const std::string& keys_file_name, const epee::wipeable_string& password, bool no_spend_key, hw::device &hwdev);
 
     wallet2(bool testnet = false, bool restricted = false);
 
@@ -487,6 +487,14 @@ namespace tools
       const cryptonote::account_public_address &account_public_address,
       const crypto::secret_key& viewkey = crypto::secret_key());
     /*!
+     * \brief Restore a wallet hold by an HW.
+     * \param  wallet_        Name of wallet file
+     * \param  password       Password of wallet file
+     * \param  device_name    name of HW to use
+     */
+    void restore(const std::string& wallet_, const epee::wipeable_string& password, const std::string &device_name);
+
+    /*!
      * \brief Creates a multisig wallet
      * \return empty if done, non empty if we need to send another string
      * to other participants
@@ -635,6 +643,7 @@ namespace tools
     bool multisig(bool *ready = NULL, uint32_t *threshold = NULL, uint32_t *total = NULL) const;
     bool has_multisig_partial_key_images() const;
     bool get_multisig_seed(std::string& seed, const epee::wipeable_string &passphrase = std::string(), bool raw = true) const;
+    bool key_on_device() const { return m_key_on_device; }
 
     // locked & unlocked balance of given or current subaddress account
     uint64_t balance(uint32_t subaddr_index_major) const;
@@ -1105,6 +1114,7 @@ namespace tools
     boost::mutex m_daemon_rpc_mutex;
 
     i_wallet2_callback* m_callback;
+    bool m_key_on_device;
     bool m_testnet;
     bool m_restricted;
     std::string seed_language; /*!< Language of the mnemonics (seed). */