wallet2: speedup large tx construction: no pointless clsag generation

4.1 seconds -> 3.3 seconds on a test case

1 files changed, 12 insertions, 1 deletions

diff --git a/src/ringct/rctSigs.cpp b/src/ringct/rctSigs.cpp
index 3e85f60ce..bd67778ec 100644
--- a/src/ringct/rctSigs.cpp
+++ b/src/ringct/rctSigs.cpp
@@ -79,6 +79,7 @@ namespace
 
         return rct::Bulletproof{rct::keyV(n_outs, I), I, I, I, I, I, I, rct::keyV(nrl, I), rct::keyV(nrl, I), I, I, I};
     }
+
     rct::BulletproofPlus make_dummy_bulletproof_plus(const std::vector<uint64_t> &outamounts, rct::keyV &C, rct::keyV &masks)
     {
         const size_t n_outs = outamounts.size();
@@ -109,6 +110,13 @@ namespace
 
         return rct::BulletproofPlus{rct::keyV(n_outs, I), I, I, I, I, I, I, rct::keyV(nrl, I), rct::keyV(nrl, I)};
     }
+
+    rct::clsag make_dummy_clsag(size_t ring_size)
+    {
+        const rct::key I = rct::identity();
+        const size_t n_scalars = ring_size;
+        return rct::clsag{rct::keyV(n_scalars, I), I, I, I};
+    }
 }
 
 namespace rct {
@@ -1323,7 +1331,10 @@ namespace rct {
         {
             if (is_rct_clsag(rv.type))
             {
-                rv.p.CLSAGs[i] = proveRctCLSAGSimple(full_message, rv.mixRing[i], inSk[i], a[i], pseudoOuts[i], kLRki ? &(*kLRki)[i]: NULL, msout ? &msout->c[i] : NULL, msout ? &msout->mu_p[i] : NULL, index[i], hwdev);
+                if (hwdev.get_mode() == hw::device::TRANSACTION_CREATE_FAKE)
+                    rv.p.CLSAGs[i] = make_dummy_clsag(rv.mixRing[i].size());
+                else
+                    rv.p.CLSAGs[i] = proveRctCLSAGSimple(full_message, rv.mixRing[i], inSk[i], a[i], pseudoOuts[i], kLRki ? &(*kLRki)[i]: NULL, msout ? &msout->c[i] : NULL, msout ? &msout->mu_p[i] : NULL, index[i], hwdev);
             }
             else
             {