1 files changed, 10 insertions, 0 deletions
diff --git a/ext/ed25519-amd64-asm/sc25519_iszero.c b/ext/ed25519-amd64-asm/sc25519_iszero.c
new file mode 100644
index 00000000..21f593d7
--- /dev/null
+++ b/ext/ed25519-amd64-asm/sc25519_iszero.c
@@ -0,0 +1,10 @@
+#include "sc25519.h"
+
+int sc25519_iszero_vartime(const sc25519 *x)
+{
+  if(x->v[0] != 0) return 0;
+  if(x->v[1] != 0) return 0;
+  if(x->v[2] != 0) return 0;
+  if(x->v[3] != 0) return 0;
+  return 1;
+}