wallet2_api: wallet recovery - seed offset passphrase support

src/wallet/api/wallet.cpp

@@ -725,7 +725,7 @@ bool WalletImpl::recover(const std::string &path, const std::string &seed)
     return recover(path, "", seed);
 }
 
-bool WalletImpl::recover(const std::string &path, const std::string &password, const std::string &seed)
+bool WalletImpl::recover(const std::string &path, const std::string &password, const std::string &seed, const std::string &seed_offset/* = {}*/)
 {
     clearStatus();
     m_errorString.clear();
@@ -743,6 +743,10 @@ bool WalletImpl::recover(const std::string &path, const std::string &password, c
         setStatusError(tr("Electrum-style word list failed verification"));
         return false;
     }
+    if (!seed_offset.empty())
+    {
+        recovery_key = cryptonote::decrypt_key(recovery_key, seed_offset);
+    }
 
     if (old_language == crypto::ElectrumWords::old_language_name)
         old_language = Language::English().get_language_name();

src/wallet/api/wallet.h

@@ -60,7 +60,7 @@ public:
                             const std::string &language) const override;
     bool open(const std::string &path, const std::string &password);
     bool recover(const std::string &path,const std::string &password,
-                            const std::string &seed);
+                            const std::string &seed, const std::string &seed_offset = {});
     bool recoverFromKeysWithPassword(const std::string &path,
                             const std::string &password,
                             const std::string &language,

src/wallet/api/wallet2_api.h

@@ -1085,10 +1085,12 @@ struct WalletManager
      * \param  nettype        Network type
      * \param  restoreHeight  restore from start height
      * \param  kdf_rounds     Number of rounds for key derivation function
+     * \param  seed_offset    Seed offset passphrase (optional)
      * \return                Wallet instance (Wallet::status() needs to be called to check if recovered successfully)
      */
     virtual Wallet * recoveryWallet(const std::string &path, const std::string &password, const std::string &mnemonic,
-                                    NetworkType nettype = MAINNET, uint64_t restoreHeight = 0, uint64_t kdf_rounds = 1) = 0;
+                                    NetworkType nettype = MAINNET, uint64_t restoreHeight = 0, uint64_t kdf_rounds = 1,
+                                    const std::string &seed_offset = {}) = 0;
     Wallet * recoveryWallet(const std::string &path, const std::string &password, const std::string &mnemonic,
                                     bool testnet = false, uint64_t restoreHeight = 0)           // deprecated
     {

src/wallet/api/wallet_manager.cpp

@@ -93,13 +93,14 @@ Wallet *WalletManagerImpl::recoveryWallet(const std::string &path,
                                                 const std::string &mnemonic,
                                                 NetworkType nettype,
                                                 uint64_t restoreHeight,
-                                                uint64_t kdf_rounds)
+                                                uint64_t kdf_rounds,
+                                                const std::string &seed_offset/* = {}*/)
 {
     WalletImpl * wallet = new WalletImpl(nettype, kdf_rounds);
     if(restoreHeight > 0){
         wallet->setRefreshFromBlockHeight(restoreHeight);
     }
-    wallet->recover(path, password, mnemonic);
+    wallet->recover(path, password, mnemonic, seed_offset);
     return wallet;
 }
 

src/wallet/api/wallet_manager.h

@@ -46,7 +46,8 @@ public:
                                        const std::string &mnemonic,
                                        NetworkType nettype,
                                        uint64_t restoreHeight,
-                                       uint64_t kdf_rounds = 1) override;
+                                       uint64_t kdf_rounds = 1,
+                                       const std::string &seed_offset = {}) override;
     virtual Wallet * createWalletFromKeys(const std::string &path,
                                              const std::string &password,
                                              const std::string &language,