device/trezor: HF10 support added, wallet::API

- import only key images generated by cold signing process
- wallet_api: trezor methods added
- wallet: button request code added
- const added to methods
- wallet2::get_tx_key_device() tries to decrypt stored tx private keys using the device.
- simplewallet supports get_tx_key and get_tx_proof on hw device using the get_tx_key feature
- live refresh enables refresh with trezor i.e. computing key images on the fly. More convenient and efficient for users.
- device: has_ki_live_refresh added
- a thread is watching whether live refresh is being computed, if not for 30 seconds, it terminates the live refresh process - switches Trezor state

src/cryptonote_basic/cryptonote_format_utils.cpp

@@ -282,6 +282,11 @@ namespace cryptonote
   //---------------------------------------------------------------
   bool generate_key_image_helper_precomp(const account_keys& ack, const crypto::public_key& out_key, const crypto::key_derivation& recv_derivation, size_t real_output_index, const subaddress_index& received_index, keypair& in_ephemeral, crypto::key_image& ki, hw::device &hwdev)
   {
+    if (hwdev.compute_key_image(ack, out_key, recv_derivation, real_output_index, received_index, in_ephemeral, ki))
+    {
+      return true;
+    }
+
     if (ack.m_spend_secret_key == crypto::null_skey)
     {
       // for watch-only wallet, simply copy the known output pubkey

src/device/device.hpp

@@ -70,6 +70,7 @@ namespace cryptonote
     struct account_keys;
     struct subaddress_index;
     struct tx_destination_entry;
+    struct keypair;
 }
 
 namespace hw {
@@ -81,11 +82,18 @@ namespace hw {
            return false;
     }
 
+    class device_progress {
+    public:
+      virtual double progress() const { return 0; }
+      virtual bool indeterminate() const { return false; }
+    };
+
     class i_device_callback {
     public:
-        virtual void on_button_request() {}
-        virtual void on_pin_request(epee::wipeable_string & pin) {}
-        virtual void on_passphrase_request(bool on_device, epee::wipeable_string & passphrase) {}
+        virtual void on_button_request(uint64_t code=0) {}
+        virtual boost::optional<epee::wipeable_string> on_pin_request() { return boost::none; }
+        virtual boost::optional<epee::wipeable_string> on_passphrase_request(bool on_device) { return boost::none; }
+        virtual void on_progress(const device_progress& event) {}
         virtual ~i_device_callback() = default;
     };
 
@@ -141,6 +149,9 @@ namespace hw {
         virtual void set_callback(i_device_callback * callback) {};
         virtual void set_derivation_path(const std::string &derivation_path) {};
 
+        virtual void set_pin(const epee::wipeable_string & pin) {}
+        virtual void set_passphrase(const epee::wipeable_string & passphrase) {}
+
         /* ======================================================================= */
         /*  LOCKER                                                                 */
         /* ======================================================================= */ 
@@ -229,7 +240,9 @@ namespace hw {
 
         virtual bool  has_ki_cold_sync(void) const { return false; }
         virtual bool  has_tx_cold_sign(void) const { return false; }
-
+        virtual bool  has_ki_live_refresh(void) const { return true; }
+        virtual bool  compute_key_image(const cryptonote::account_keys& ack, const crypto::public_key& out_key, const crypto::key_derivation& recv_derivation, size_t real_output_index, const cryptonote::subaddress_index& received_index, cryptonote::keypair& in_ephemeral, crypto::key_image& ki) { return false; }
+        virtual void  computing_key_images(bool started) {};
         virtual void  set_network_type(cryptonote::network_type network_type) { }
 
     protected:

src/device/device_cold.hpp

@@ -31,6 +31,7 @@
 #define MONERO_DEVICE_COLD_H
 
 #include "wallet/wallet2.h"
+#include <boost/optional/optional.hpp>
 #include <boost/function.hpp>
 
 
@@ -44,13 +45,62 @@ namespace hw {
   public:
     std::vector<std::string> tx_device_aux;  // device generated aux data
     std::vector<cryptonote::address_parse_info> tx_recipients;  // as entered by user
+    boost::optional<int> bp_version;  // BP version to use
+    boost::optional<unsigned> client_version;  // Signing client version to use (testing)
   };
 
   class device_cold {
   public:
 
     using exported_key_image = std::vector<std::pair<crypto::key_image, crypto::signature>>;
 
+    class op_progress : public hw::device_progress {
+    public:
+      op_progress():m_progress(0), m_indeterminate(false) {};
+      explicit op_progress(double progress, bool indeterminate=false): m_progress(progress), m_indeterminate(indeterminate){}
+
+      double progress() const override { return m_progress; }
+      bool indeterminate() const override { return m_indeterminate; }
+    protected:
+      double m_progress;
+      bool m_indeterminate;
+    };
+
+    class tx_progress : public op_progress {
+    public:
+      tx_progress():
+        m_cur_tx(0), m_max_tx(1),
+        m_cur_step(0), m_max_step(1),
+        m_cur_substep(0), m_max_substep(1){};
+
+      tx_progress(size_t cur_tx, size_t max_tx, size_t cur_step, size_t max_step, size_t cur_substep, size_t max_substep):
+        m_cur_tx(cur_tx), m_max_tx(max_tx),
+        m_cur_step(cur_tx), m_max_step(max_tx),
+        m_cur_substep(cur_tx), m_max_substep(max_tx){}
+
+      double progress() const override {
+        return std::max(1.0, (double)m_cur_tx / m_max_tx
+          + (double)m_cur_step / (m_max_tx * m_max_step)
+          + (double)m_cur_substep / (m_max_tx * m_max_step * m_max_substep));
+      }
+      bool indeterminate() const override { return false; }
+
+    protected:
+      size_t m_cur_tx;
+      size_t m_max_tx;
+      size_t m_cur_step;
+      size_t m_max_step;
+      size_t m_cur_substep;
+      size_t m_max_substep;
+    };
+
+    typedef struct {
+      std::string salt1;
+      std::string salt2;
+      std::string tx_enc_keys;
+      std::string tx_prefix_hash;
+    } tx_key_data_t;
+
     /**
      * Key image sync with the cold protocol.
      */
@@ -65,6 +115,54 @@ namespace hw {
                  const ::tools::wallet2::unsigned_tx_set & unsigned_tx,
                  ::tools::wallet2::signed_tx_set & signed_tx,
                  tx_aux_data & aux_data) =0;
+
+    /**
+     * Get tx key support check.
+     */
+    virtual bool is_get_tx_key_supported() const { return false; }
+
+    /**
+     * Loads TX aux data required for tx key.
+     */
+    virtual void load_tx_key_data(tx_key_data_t & res, const std::string & tx_aux_data) =0;
+
+    /**
+     * Decrypts TX keys.
+     * If view_public_key is set, derivations are computed instead of the tx private keys.
+     */
+    virtual void get_tx_key(
+        std::vector<::crypto::secret_key> & tx_keys,
+        const tx_key_data_t & tx_aux_data,
+        const ::crypto::secret_key & view_key_priv,
+        const boost::optional<std::string> & view_public_key) =0;
+
+    /**
+     * Live refresh support check
+     */
+    virtual bool is_live_refresh_supported() const { return false; };
+
+    /**
+     * Starts live refresh process with the device
+     */
+    virtual void live_refresh_start() =0;
+
+    /**
+     * One live refresh step
+     */
+    virtual void live_refresh(
+        const ::crypto::secret_key & view_key_priv,
+        const crypto::public_key& out_key,
+        const crypto::key_derivation& recv_derivation,
+        size_t real_output_index,
+        const cryptonote::subaddress_index& received_index,
+        cryptonote::keypair& in_ephemeral,
+        crypto::key_image& ki
+    ) =0;
+
+    /**
+     * Live refresh process termination
+     */
+    virtual void live_refresh_finish() =0;
   };
 }