require canonical multi output bulletproof layout

src/cryptonote_core/cryptonote_core.cpp

@@ -745,6 +745,25 @@ namespace cryptonote
     bad_semantics_txes_lock.unlock();
   }
   //-----------------------------------------------------------------------------------------------
+  static bool is_canonical_bulletproof_layout(const std::vector<rct::Bulletproof> &proofs)
+  {
+    size_t n_amounts = rct::n_bulletproof_amounts(proofs), amounts_proved = 0;
+    size_t n = 0;
+    while (amounts_proved < n_amounts)
+    {
+      if (n >= proofs.size())
+        return false;
+      size_t batch_size = 1;
+      while (batch_size * 2 + amounts_proved <= n_amounts && batch_size * 2 <= BULLETPROOF_MAX_OUTPUTS)
+        batch_size *= 2;
+      if (rct::n_bulletproof_amounts(proofs[n]) != batch_size)
+        return false;
+      amounts_proved += batch_size;
+      ++n;
+    }
+    return true;
+  }
+  //-----------------------------------------------------------------------------------------------
   bool core::handle_incoming_tx_accumulated_batch(std::vector<tx_verification_batch_info> &tx_info, bool keeped_by_block)
   {
     bool ret = true;
@@ -797,6 +816,16 @@ namespace cryptonote
           }
           break;
         case rct::RCTTypeBulletproof:
+          // in addition to valid bulletproofs, we want multi-out
+          // proofs to be in decreasing power of 2 constituents
+          if (!is_canonical_bulletproof_layout(rv.p.bulletproofs))
+          {
+            MERROR_VER("Bulletproof does not use decreasing power of 2 rule");
+            set_semantics_failed(tx_info[n].tx_hash);
+            tx_info[n].tvc.m_verifivation_failed = true;
+            tx_info[n].result = false;
+            break;
+          }
           rvv.push_back(&rv); // delayed batch verification
           break;
         default:

tests/core_tests/bulletproofs.cpp

@@ -215,14 +215,14 @@ bool gen_bp_tx_valid_1::generate(std::vector<test_event_entry>& events) const
   return generate_with(events, out_idx, mixin, 1, amounts_paid, true, multi_out, NULL, [&](const cryptonote::transaction &tx, size_t tx_idx){ return check_bp(tx, tx_idx, bp_sizes, "gen_bp_tx_valid_1"); });
 }
 
-bool gen_bp_tx_valid_1_1::generate(std::vector<test_event_entry>& events) const
+bool gen_bp_tx_invalid_1_1::generate(std::vector<test_event_entry>& events) const
 {
   const int mixin = 6;
   const int out_idx[] = {1, -1};
   const uint64_t amounts_paid[] = {5000, 5000, (uint64_t)-1};
   const size_t bp_sizes[] = {1, 1, (size_t)-1};
   const bool multi_out[] = {false};
-  return generate_with(events, out_idx, mixin, 1, amounts_paid, true, multi_out, NULL, [&](const cryptonote::transaction &tx, size_t tx_idx){ return check_bp(tx, tx_idx, bp_sizes, "gen_bp_tx_valid_1_1"); });
+  return generate_with(events, out_idx, mixin, 1, amounts_paid, false, multi_out, NULL, [&](const cryptonote::transaction &tx, size_t tx_idx){ return check_bp(tx, tx_idx, bp_sizes, "gen_bp_tx_invalid_1_1"); });
 }
 
 bool gen_bp_tx_valid_2::generate(std::vector<test_event_entry>& events) const
@@ -265,13 +265,13 @@ bool gen_bp_txs_valid_2_and_2::generate(std::vector<test_event_entry>& events) c
   return generate_with(events, out_idx, mixin, 2, amounts_paid, true, multi_out, NULL, [&](const cryptonote::transaction &tx, size_t tx_idx){ return check_bp(tx, tx_idx, bp_sizes, "gen_bp_txs_valid_2_2"); });
 }
 
-bool gen_bp_txs_valid_1_1_and_8_2_and_16_16_1::generate(std::vector<test_event_entry>& events) const
+bool gen_bp_txs_valid_2_and_8_2_and_16_16_1::generate(std::vector<test_event_entry>& events) const
 {
   const int mixin = 6;
   const int out_idx[] = {1, -1};
   const uint64_t amounts_paid[] = {1000, 1000, (uint64_t)-1, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, (uint64_t)-1, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, (uint64_t)-1};
-  const bool multi_out[] = {false, true, true};
+  const bool multi_out[] = {true, true, true};
-  const size_t bp_sizes[] = {1, 1, (size_t)-1, 8, 2, (size_t)-1, 16, 16, 1, (size_t)-1};
+  const size_t bp_sizes[] = {2, (size_t)-1, 8, 2, (size_t)-1, 16, 16, 1, (size_t)-1};
   return generate_with(events, out_idx, mixin, 3, amounts_paid, true, multi_out, NULL, [&](const cryptonote::transaction &tx, size_t tx_idx){ return check_bp(tx, tx_idx, bp_sizes, "gen_bp_txs_valid_1_1_and_8_2_and_16_16_1"); });
 }
 
@@ -325,8 +325,8 @@ bool gen_bp_tx_invalid_switched::generate(std::vector<test_event_entry>& events)
   DEFINE_TESTS_ERROR_CONTEXT("gen_bp_tx_invalid_switched");
   const int mixin = 6;
   const int out_idx[] = {1, -1};
-  const uint64_t amounts_paid[] = {5000, 5000, (uint64_t)-1};
+  const uint64_t amounts_paid[] = {1001, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, (uint64_t)-1};
-  const bool multi_out[] = {false};
+  const bool multi_out[] = {true};
   return generate_with(events, out_idx, mixin, 1, amounts_paid, false, multi_out, NULL, [&](cryptonote::transaction &tx, size_t tx_idx){
     CHECK_TEST_CONDITION(tx.rct_signatures.type == rct::RCTTypeBulletproof);
     CHECK_TEST_CONDITION(tx.rct_signatures.p.bulletproofs.size() == 2);

tests/core_tests/bulletproofs.h

@@ -108,11 +108,11 @@ struct gen_bp_tx_valid_1 : public gen_bp_tx_validation_base
 };
 template<> struct get_test_options<gen_bp_tx_valid_1>: public get_test_options<gen_bp_tx_validation_base> {};
 
-struct gen_bp_tx_valid_1_1 : public gen_bp_tx_validation_base
+struct gen_bp_tx_invalid_1_1 : public gen_bp_tx_validation_base
 {
   bool generate(std::vector<test_event_entry>& events) const;
 };
-template<> struct get_test_options<gen_bp_tx_valid_1_1>: public get_test_options<gen_bp_tx_validation_base> {};
+template<> struct get_test_options<gen_bp_tx_invalid_1_1>: public get_test_options<gen_bp_tx_validation_base> {};
 
 struct gen_bp_tx_valid_2 : public gen_bp_tx_validation_base
 {
@@ -138,11 +138,11 @@ struct gen_bp_txs_valid_2_and_2 : public gen_bp_tx_validation_base
 };
 template<> struct get_test_options<gen_bp_txs_valid_2_and_2>: public get_test_options<gen_bp_tx_validation_base> {};
 
-struct gen_bp_txs_valid_1_1_and_8_2_and_16_16_1 : public gen_bp_tx_validation_base
+struct gen_bp_txs_valid_2_and_8_2_and_16_16_1 : public gen_bp_tx_validation_base
 {
   bool generate(std::vector<test_event_entry>& events) const;
 };
-template<> struct get_test_options<gen_bp_txs_valid_1_1_and_8_2_and_16_16_1>: public get_test_options<gen_bp_tx_validation_base> {};
+template<> struct get_test_options<gen_bp_txs_valid_2_and_8_2_and_16_16_1>: public get_test_options<gen_bp_tx_validation_base> {};
 
 struct gen_bp_tx_invalid_not_enough_proofs : public gen_bp_tx_validation_base
 {

tests/core_tests/chaingen_main.cpp

@@ -225,12 +225,12 @@ int main(int argc, char* argv[])
     GENERATE_AND_PLAY(gen_multisig_tx_invalid_33_1_3_no_threshold);
 
     GENERATE_AND_PLAY(gen_bp_tx_valid_1);
-    GENERATE_AND_PLAY(gen_bp_tx_valid_1_1);
+    GENERATE_AND_PLAY(gen_bp_tx_invalid_1_1);
     GENERATE_AND_PLAY(gen_bp_tx_valid_2);
     GENERATE_AND_PLAY(gen_bp_tx_valid_4_2_1);
     GENERATE_AND_PLAY(gen_bp_tx_valid_16_16);
     GENERATE_AND_PLAY(gen_bp_txs_valid_2_and_2);
-    GENERATE_AND_PLAY(gen_bp_txs_valid_1_1_and_8_2_and_16_16_1);
+    GENERATE_AND_PLAY(gen_bp_txs_valid_2_and_8_2_and_16_16_1);
     GENERATE_AND_PLAY(gen_bp_tx_invalid_not_enough_proofs);
     GENERATE_AND_PLAY(gen_bp_tx_invalid_too_many_proofs);
     GENERATE_AND_PLAY(gen_bp_tx_invalid_wrong_amount);