from hard fork 2, all outputs must be decomposed

The wallet decomposes fully as of now too.

src/cryptonote_core/blockchain.cpp

@@ -1972,6 +1972,23 @@ bool Blockchain::check_tx_inputs(const transaction& tx, uint64_t& max_used_block
     return true;
 }
 //------------------------------------------------------------------
+bool Blockchain::check_tx_outputs(const transaction& tx)
+{
+    LOG_PRINT_L3("Blockchain::" << __func__);
+    CRITICAL_REGION_LOCAL(m_blockchain_lock);
+
+    // from hard fork 2, we forbid dust and compound outputs
+    if (m_hardfork->get_current_version() >= 2) {
+      BOOST_FOREACH(auto &o, tx.vout) {
+        if (!is_valid_decomposed_amount(o.amount)) {
+          return false;
+        }
+      }
+    }
+
+    return true;
+}
+//------------------------------------------------------------------
 bool Blockchain::have_tx_keyimges_as_spent(const transaction &tx) const
 {
     LOG_PRINT_L3("Blockchain::" << __func__);

src/cryptonote_core/blockchain.h

@@ -134,6 +134,7 @@ namespace cryptonote
     bool store_blockchain();
 
     bool check_tx_inputs(const transaction& tx, uint64_t& pmax_used_block_height, crypto::hash& max_used_block_id, bool kept_by_block = false);
+    bool check_tx_outputs(const transaction& tx);
     uint64_t get_current_cumulative_blocksize_limit() const;
     bool is_storing_blockchain()const{return m_is_blockchain_storing;}
     uint64_t block_difficulty(uint64_t i) const;

src/cryptonote_core/cryptonote_format_utils.cpp

@@ -141,7 +141,7 @@ namespace cryptonote
     block_reward += fee;
 
     std::vector<uint64_t> out_amounts;
-    decompose_amount_into_digits(block_reward, ::config::DEFAULT_DUST_THRESHOLD,
+    decompose_amount_into_digits(block_reward, hard_fork_version >= 2 ? 0 : ::config::DEFAULT_DUST_THRESHOLD,
       [&out_amounts](uint64_t a_chunk) { out_amounts.push_back(a_chunk); },
       [&out_amounts](uint64_t a_dust) { out_amounts.push_back(a_dust); });
 

src/cryptonote_core/tx_pool.cpp

@@ -125,6 +125,12 @@ namespace cryptonote
       }
     }
 
+    if (!m_blockchain.check_tx_outputs(tx))
+    {
+      LOG_PRINT_L1("Transaction with id= "<< id << " has at least one invalid outout");
+      tvc.m_verifivation_failed = true;
+      return false;
+    }
 
     crypto::hash max_used_block_id = null_hash;
     uint64_t max_used_block_height = 0;

src/wallet/wallet2.cpp

@@ -1143,7 +1143,7 @@ uint64_t wallet2::select_transfers(uint64_t needed_money, bool add_dust, uint64_
     const transfer_details& td = m_transfers[i];
     if (!td.m_spent && is_transfer_unlocked(td))
     {
-      if (dust < td.amount())
+      if (dust < td.amount() && is_valid_decomposed_amount(td.amount()))
         unused_transfers_indices.push_back(i);
       else
         unused_dust_indices.push_back(i);
@@ -1572,14 +1572,17 @@ void wallet2::transfer_selected(const std::vector<cryptonote::tx_destination_ent
     change_dts.amount = found_money - needed_money;
   }
 
+  std::vector<cryptonote::tx_destination_entry> splitted_dsts, dust_dsts;
   uint64_t dust = 0;
-  std::vector<cryptonote::tx_destination_entry> splitted_dsts;
+  destination_split_strategy(dsts, change_dts, dust_policy.dust_threshold, splitted_dsts, dust_dsts);
-  destination_split_strategy(dsts, change_dts, dust_policy.dust_threshold, splitted_dsts, dust);
+  BOOST_FOREACH(auto& d, dust_dsts) {
-  THROW_WALLET_EXCEPTION_IF(dust_policy.dust_threshold < dust, error::wallet_internal_error, "invalid dust value: dust = " +
+    THROW_WALLET_EXCEPTION_IF(dust_policy.dust_threshold < d.amount, error::wallet_internal_error, "invalid dust value: dust = " +
-    std::to_string(dust) + ", dust_threshold = " + std::to_string(dust_policy.dust_threshold));
+      std::to_string(d.amount) + ", dust_threshold = " + std::to_string(dust_policy.dust_threshold));
-  if (0 != dust && !dust_policy.add_to_fee)
+  }
-  {
+  BOOST_FOREACH(auto& d, dust_dsts) {
-    splitted_dsts.push_back(cryptonote::tx_destination_entry(dust, dust_policy.addr_for_dust));
+    if (!dust_policy.add_to_fee)
+      splitted_dsts.push_back(cryptonote::tx_destination_entry(d.amount, dust_policy.addr_for_dust));
+    dust += d.amount;
   }
 
   crypto::secret_key tx_key;
@@ -1669,7 +1672,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
     const transfer_details& td = m_transfers[i];
     if (!td.m_spent && is_transfer_unlocked(td))
     {
-      if (::config::DEFAULT_DUST_THRESHOLD <= td.amount())
+      if (is_valid_decomposed_amount(td.amount()))
         unused_transfers_indices.push_back(i);
       else
         unused_dust_indices.push_back(i);
@@ -1923,11 +1926,12 @@ void wallet2::transfer_dust(size_t num_outputs, uint64_t unlock_time, uint64_t n
   if (dust_policy.dust_threshold > 0)
     money_back = money_back - money_back % dust_policy.dust_threshold;
   dsts.push_back(cryptonote::tx_destination_entry(money_back, m_account_public_address));
-  uint64_t dust = 0;
+  std::vector<cryptonote::tx_destination_entry> splitted_dsts, dust;
-  std::vector<cryptonote::tx_destination_entry> splitted_dsts;
   destination_split_strategy(dsts, change_dts, dust_policy.dust_threshold, splitted_dsts, dust);
-  THROW_WALLET_EXCEPTION_IF(dust_policy.dust_threshold < dust, error::wallet_internal_error, "invalid dust value: dust = " +
+  BOOST_FOREACH(auto& d, dust) {
-    std::to_string(dust) + ", dust_threshold = " + std::to_string(dust_policy.dust_threshold));
+    THROW_WALLET_EXCEPTION_IF(dust_policy.dust_threshold < d.amount, error::wallet_internal_error, "invalid dust value: dust = " +
+      std::to_string(d.amount) + ", dust_threshold = " + std::to_string(dust_policy.dust_threshold));
+  }
 
   crypto::secret_key tx_key;
   bool r = cryptonote::construct_tx_and_get_tx_key(m_account.get_keys(), sources, splitted_dsts, extra, tx, unlock_time, tx_key);
@@ -1945,7 +1949,7 @@ void wallet2::transfer_dust(size_t num_outputs, uint64_t unlock_time, uint64_t n
 
   ptx.key_images = key_images;
   ptx.fee = money - money_back;
-  ptx.dust = dust;
+  ptx.dust = 0;
   ptx.tx = tx;
   ptx.change_dts = change_dts;
   ptx.selected_transfers = selected_transfers;
@@ -1961,7 +1965,7 @@ std::vector<wallet2::pending_tx> wallet2::create_dust_sweep_transactions()
   for (transfer_container::const_iterator i = m_transfers.begin(); i != m_transfers.end(); ++i)
   {
     const transfer_details& td = *i;
-    if (!td.m_spent && td.amount() < dust_policy.dust_threshold && is_transfer_unlocked(td))
+    if (!td.m_spent && (td.amount() < dust_policy.dust_threshold || !is_valid_decomposed_amount(td.amount())) && is_transfer_unlocked(td))
     {
       num_dust_outputs++;
     }

src/wallet/wallet2.h

@@ -400,48 +400,36 @@ namespace tools
     //----------------------------------------------------------------------------------------------------
     inline void digit_split_strategy(const std::vector<cryptonote::tx_destination_entry>& dsts,
       const cryptonote::tx_destination_entry& change_dst, uint64_t dust_threshold,
-      std::vector<cryptonote::tx_destination_entry>& splitted_dsts, uint64_t& dust)
+      std::vector<cryptonote::tx_destination_entry>& splitted_dsts, std::vector<cryptonote::tx_destination_entry> &dust_dsts)
     {
       splitted_dsts.clear();
-      dust = 0;
+      dust_dsts.clear();
 
       BOOST_FOREACH(auto& de, dsts)
       {
-        cryptonote::decompose_amount_into_digits(de.amount, dust_threshold,
+        cryptonote::decompose_amount_into_digits(de.amount, 0,
           [&](uint64_t chunk) { splitted_dsts.push_back(cryptonote::tx_destination_entry(chunk, de.addr)); },
           [&](uint64_t a_dust) { splitted_dsts.push_back(cryptonote::tx_destination_entry(a_dust, de.addr)); } );
       }
 
-      cryptonote::decompose_amount_into_digits(change_dst.amount, dust_threshold,
+      cryptonote::decompose_amount_into_digits(change_dst.amount, 0,
-        [&](uint64_t chunk) { splitted_dsts.push_back(cryptonote::tx_destination_entry(chunk, change_dst.addr)); },
+        [&](uint64_t chunk) {
-        [&](uint64_t a_dust) { dust = a_dust; } );
+          if (chunk <= dust_threshold)
+            dust_dsts.push_back(cryptonote::tx_destination_entry(chunk, change_dst.addr));
+          else
+            splitted_dsts.push_back(cryptonote::tx_destination_entry(chunk, change_dst.addr));
+        },
+        [&](uint64_t a_dust) { dust_dsts.push_back(cryptonote::tx_destination_entry(a_dust, change_dst.addr)); } );
     }
     //----------------------------------------------------------------------------------------------------
     inline void null_split_strategy(const std::vector<cryptonote::tx_destination_entry>& dsts,
       const cryptonote::tx_destination_entry& change_dst, uint64_t dust_threshold,
-      std::vector<cryptonote::tx_destination_entry>& splitted_dsts, uint64_t& dust)
+      std::vector<cryptonote::tx_destination_entry>& splitted_dsts, std::vector<cryptonote::tx_destination_entry> &dust_dsts)
     {
       splitted_dsts = dsts;
 
-      dust = 0;
+      dust_dsts.clear();
       uint64_t change = change_dst.amount;
-      if (0 < dust_threshold)
-      {
-        for (uint64_t order = 10; order <= 10 * dust_threshold; order *= 10)
-        {
-          uint64_t dust_candidate = change_dst.amount % order;
-          uint64_t change_candidate = (change_dst.amount / order) * order;
-          if (dust_candidate <= dust_threshold)
-          {
-            dust = dust_candidate;
-            change = change_candidate;
-          }
-          else
-          {
-            break;
-          }
-        }
-      }
 
       if (0 != change)
       {
@@ -577,14 +565,17 @@ namespace tools
       change_dts.amount = found_money - needed_money;
     }
 
+    std::vector<cryptonote::tx_destination_entry> splitted_dsts, dust_dsts;
     uint64_t dust = 0;
-    std::vector<cryptonote::tx_destination_entry> splitted_dsts;
+    destination_split_strategy(dsts, change_dts, dust_policy.dust_threshold, splitted_dsts, dust_dsts);
-    destination_split_strategy(dsts, change_dts, dust_policy.dust_threshold, splitted_dsts, dust);
+    BOOST_FOREACH(auto& d, dust_dsts) {
-    THROW_WALLET_EXCEPTION_IF(dust_policy.dust_threshold < dust, error::wallet_internal_error, "invalid dust value: dust = " +
+      THROW_WALLET_EXCEPTION_IF(dust_policy.dust_threshold < d.amount, error::wallet_internal_error, "invalid dust value: dust = " +
-      std::to_string(dust) + ", dust_threshold = " + std::to_string(dust_policy.dust_threshold));
+        std::to_string(d.amount) + ", dust_threshold = " + std::to_string(dust_policy.dust_threshold));
-    if (0 != dust && !dust_policy.add_to_fee)
+    }
-    {
+    BOOST_FOREACH(auto& d, dust_dsts) {
-      splitted_dsts.push_back(cryptonote::tx_destination_entry(dust, dust_policy.addr_for_dust));
+      if (!dust_policy.add_to_fee)
+        splitted_dsts.push_back(cryptonote::tx_destination_entry(d.amount, dust_policy.addr_for_dust));
+      dust += d.amount;
     }
 
     crypto::secret_key tx_key;