bulletproofs: speed up the latest changes a bit

1 files changed, 14 insertions, 0 deletions

diff --git a/src/ringct/rctOps.cpp b/src/ringct/rctOps.cpp
index df027f4b6..6c3c4500e 100644
--- a/src/ringct/rctOps.cpp
+++ b/src/ringct/rctOps.cpp
@@ -211,6 +211,20 @@ namespace rct {
         return aP;
     }
 
+    //Computes 8P
+    key scalarmult8(const key & P) {
+        ge_p3 p3;
+        CHECK_AND_ASSERT_THROW_MES_L1(ge_frombytes_vartime(&p3, P.bytes) == 0, "ge_frombytes_vartime failed at "+boost::lexical_cast<std::string>(__LINE__));
+        ge_p2 p2;
+        ge_p3_to_p2(&p2, &p3);
+        ge_p1p1 p1;
+        ge_mul8(&p1, &p2);
+        ge_p1p1_to_p2(&p2, &p1);
+        rct::key res;
+        ge_tobytes(res.bytes, &p2);
+        return res;
+    }
+
     //Computes aL where L is the curve order
     bool isInMainSubgroup(const key & a) {
         ge_p3 p3;