Use masked table lookup in ECC base point multiplication

1 files changed, 12 insertions, 0 deletions

diff --git a/src/lib/utils/ct_utils.h b/src/lib/utils/ct_utils.h
index f67fb8f10..013267874 100644
--- a/src/lib/utils/ct_utils.h
+++ b/src/lib/utils/ct_utils.h
@@ -108,6 +108,18 @@ inline T select(T mask, T from0, T from1)
    return static_cast<T>((from0 & mask) | (from1 & ~mask));
    }
 
+template<typename T>
+inline T select2(T mask0, T val0, T mask1, T val1, T val2)
+   {
+   return select<T>(mask0, val0, select<T>(mask1, val1, val2));
+   }
+
+template<typename T>
+inline T select3(T mask0, T val0, T mask1, T val1, T mask2, T val2, T val3)
+   {
+   return select2<T>(mask0, val0, mask1, val1, select<T>(mask2, val2, val3));
+   }
+
 template<typename PredT, typename ValT>
 inline ValT val_or_zero(PredT pred_val, ValT val)
    {