wallet2: fix bulletproof cold signing

Cold signing was always using Borromean range proofs, causing
a larger tx, and an incorrect fee

src/wallet/wallet2.cpp

@@ -4788,11 +4788,10 @@ bool wallet2::sign_tx(unsigned_tx_set &exported_txs, const std::string &signed_f
     LOG_PRINT_L1(" " << (n+1) << ": " << sd.sources.size() << " inputs, ring size " << sd.sources[0].outputs.size());
     signed_txes.ptx.push_back(pending_tx());
     tools::wallet2::pending_tx &ptx = signed_txes.ptx.back();
-    bool bulletproof = sd.use_rct && !ptx.tx.rct_signatures.p.bulletproofs.empty();
     crypto::secret_key tx_key;
     std::vector<crypto::secret_key> additional_tx_keys;
     rct::multisig_out msout;
-    bool r = cryptonote::construct_tx_and_get_tx_key(m_account.get_keys(), m_subaddresses, sd.sources, sd.splitted_dsts, sd.change_dts.addr, sd.extra, ptx.tx, sd.unlock_time, tx_key, additional_tx_keys, sd.use_rct, bulletproof, m_multisig ? &msout : NULL);
+    bool r = cryptonote::construct_tx_and_get_tx_key(m_account.get_keys(), m_subaddresses, sd.sources, sd.splitted_dsts, sd.change_dts.addr, sd.extra, ptx.tx, sd.unlock_time, tx_key, additional_tx_keys, sd.use_rct, sd.use_bulletproofs, m_multisig ? &msout : NULL);
     THROW_WALLET_EXCEPTION_IF(!r, error::tx_not_constructed, sd.sources, sd.splitted_dsts, sd.unlock_time, m_nettype);
     // we don't test tx size, because we don't know the current limit, due to not having a blockchain,
     // and it's a bit pointless to fail there anyway, since it'd be a (good) guess only. We sign anyway,
@@ -5168,8 +5167,7 @@ bool wallet2::sign_multisig_tx(multisig_tx_set &exported_txs, std::vector<crypto
     cryptonote::transaction tx;
     rct::multisig_out msout = ptx.multisig_sigs.front().msout;
     auto sources = sd.sources;
-    const bool bulletproof = sd.use_rct && (ptx.tx.rct_signatures.type == rct::RCTTypeFullBulletproof || ptx.tx.rct_signatures.type == rct::RCTTypeSimpleBulletproof);
+    bool r = cryptonote::construct_tx_with_tx_key(m_account.get_keys(), m_subaddresses, sources, sd.splitted_dsts, ptx.change_dts.addr, sd.extra, tx, sd.unlock_time, ptx.tx_key, ptx.additional_tx_keys, sd.use_rct, sd.use_bulletproofs, &msout, false);
-    bool r = cryptonote::construct_tx_with_tx_key(m_account.get_keys(), m_subaddresses, sources, sd.splitted_dsts, ptx.change_dts.addr, sd.extra, tx, sd.unlock_time, ptx.tx_key, ptx.additional_tx_keys, sd.use_rct, bulletproof, &msout, false);
     THROW_WALLET_EXCEPTION_IF(!r, error::tx_not_constructed, sd.sources, sd.splitted_dsts, sd.unlock_time, m_nettype);
 
     THROW_WALLET_EXCEPTION_IF(get_transaction_prefix_hash (tx) != get_transaction_prefix_hash(ptx.tx),
@@ -6472,6 +6470,7 @@ void wallet2::transfer_selected(const std::vector<cryptonote::tx_destination_ent
   ptx.construction_data.extra = tx.extra;
   ptx.construction_data.unlock_time = unlock_time;
   ptx.construction_data.use_rct = false;
+  ptx.construction_data.use_bulletproofs = false;
   ptx.construction_data.dests = dsts;
   // record which subaddress indices are being used as inputs
   ptx.construction_data.subaddr_account = subaddr_account;
@@ -6727,6 +6726,7 @@ void wallet2::transfer_selected_rct(std::vector<cryptonote::tx_destination_entry
   ptx.construction_data.extra = tx.extra;
   ptx.construction_data.unlock_time = unlock_time;
   ptx.construction_data.use_rct = true;
+  ptx.construction_data.use_bulletproofs = !tx.rct_signatures.p.bulletproofs.empty();
   ptx.construction_data.dests = dsts;
   // record which subaddress indices are being used as inputs
   ptx.construction_data.subaddr_account = subaddr_account;

src/wallet/wallet2.h

@@ -320,6 +320,7 @@ namespace tools
       std::vector<uint8_t> extra;
       uint64_t unlock_time;
       bool use_rct;
+      bool use_bulletproofs;
       std::vector<cryptonote::tx_destination_entry> dests; // original setup, does not include change
       uint32_t subaddr_account;   // subaddress account of your wallet to be used in this transfer
       std::set<uint32_t> subaddr_indices;  // set of address indices used as inputs in this transfer
@@ -332,6 +333,7 @@ namespace tools
         FIELD(extra)
         FIELD(unlock_time)
         FIELD(use_rct)
+        FIELD(use_bulletproofs)
         FIELD(dests)
         FIELD(subaddr_account)
         FIELD(subaddr_indices)
@@ -1248,7 +1250,7 @@ BOOST_CLASS_VERSION(tools::wallet2::address_book_row, 17)
 BOOST_CLASS_VERSION(tools::wallet2::reserve_proof_entry, 0)
 BOOST_CLASS_VERSION(tools::wallet2::unsigned_tx_set, 0)
 BOOST_CLASS_VERSION(tools::wallet2::signed_tx_set, 0)
-BOOST_CLASS_VERSION(tools::wallet2::tx_construction_data, 2)
+BOOST_CLASS_VERSION(tools::wallet2::tx_construction_data, 3)
 BOOST_CLASS_VERSION(tools::wallet2::pending_tx, 3)
 BOOST_CLASS_VERSION(tools::wallet2::multisig_sig, 0)
 
@@ -1595,6 +1597,9 @@ namespace boost
       if (ver < 2)
         return;
       a & x.selected_transfers;
+      if (ver < 3)
+        return;
+      a & x.use_bulletproofs;
     }
 
     template <class Archive>
@@ -1880,6 +1885,7 @@ namespace tools
     ptx.construction_data.extra = tx.extra;
     ptx.construction_data.unlock_time = unlock_time;
     ptx.construction_data.use_rct = false;
+    ptx.construction_data.use_bulletproofs = false;
     ptx.construction_data.dests = dsts;
     // record which subaddress indices are being used as inputs
     ptx.construction_data.subaddr_account = subaddr_account;