account: allow creating an account from a public address and view secret key

src/cryptonote_core/account.cpp

@@ -93,6 +93,22 @@ DISABLE_VS_WARNINGS(4244 4345)
     return first;
   }
   //-----------------------------------------------------------------
+  void account_base::create_from_viewkey(const cryptonote::account_public_address& address, const crypto::secret_key& viewkey)
+  {
+    m_keys.m_account_address = address;
+    m_keys.m_view_secret_key = viewkey;
+
+    struct tm timestamp;
+    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);
+  }
+  //-----------------------------------------------------------------
   const account_keys& account_base::get_keys() const
   {
     return m_keys;

src/cryptonote_core/account.h

@@ -58,6 +58,7 @@ namespace cryptonote
   public:
     account_base();
     crypto::secret_key generate(const crypto::secret_key& recovery_key = crypto::secret_key(), bool recover = false, bool two_random = false);
+    void create_from_viewkey(const cryptonote::account_public_address& address, const crypto::secret_key& viewkey);
     const account_keys& get_keys() const;
     std::string get_public_address_str(bool testnet) const;
     std::string get_public_integrated_address_str(const crypto::hash &payment_id, bool testnet) const;