Add a define for the max number of bulletproof multi-outputs

src/cryptonote_config.h

@@ -141,6 +141,8 @@
 
 #define DEFAULT_TXPOOL_MAX_SIZE                 648000000ull // 3 days at 300000, in bytes
 
+#define BULLETPROOF_MAX_OUTPUTS                 16
+
 // New constants are intended to go here
 namespace config
 {

src/ringct/bulletproofs.cc

@@ -33,6 +33,7 @@
 #include <boost/thread/mutex.hpp>
 #include "misc_log_ex.h"
 #include "common/perf_timer.h"
+#include "cryptonote_config.h"
 extern "C"
 {
 #include "crypto/crypto-ops.h"
@@ -57,7 +58,7 @@ static rct::keyV vector_dup(const rct::key &x, size_t n);
 static rct::key inner_product(const rct::keyV &a, const rct::keyV &b);
 
 static constexpr size_t maxN = 64;
-static constexpr size_t maxM = 16;
+static constexpr size_t maxM = BULLETPROOF_MAX_OUTPUTS;
 static rct::key Hi[maxN*maxM], Gi[maxN*maxM];
 static ge_p3 Hi_p3[maxN*maxM], Gi_p3[maxN*maxM];
 static ge_dsmp Gprecomp[maxN*maxM], Hprecomp[maxN*maxM];

src/ringct/rctSigs.cpp

@@ -762,7 +762,7 @@ namespace rct {
             {
                 size_t batch_size = 1;
                 if (range_proof_type == RangeProofMultiOutputBulletproof)
-                  while (batch_size * 2 + amounts_proved <= n_amounts && batch_size * 2 <= 16)
+                  while (batch_size * 2 + amounts_proved <= n_amounts && batch_size * 2 <= BULLETPROOF_MAX_OUTPUTS)
                     batch_size *= 2;
                 rct::keyV C, masks;
                 std::vector<uint64_t> batch_amounts(batch_size);