From b761bf653a8897b7829bc4474116bbf249bea7a6 Mon Sep 17 00:00:00 2001
From: WolverinDEV <git@mcgalaxy.de>
Date: Tue, 24 Apr 2018 20:18:34 +0200
Subject: [PATCH] add methode ge_scalarmult_vartime

---
 include/ge.h |  1 +
 src/ge.c     | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/include/ge.h b/include/ge.h
index 17fde2d..88509d8 100644
--- a/include/ge.h
+++ b/include/ge.h
@@ -58,6 +58,7 @@ int ge_frombytes_negate_vartime(ge_p3 *h, const unsigned char *s);
 void ge_add(ge_p1p1 *r, const ge_p3 *p, const ge_cached *q);
 void ge_sub(ge_p1p1 *r, const ge_p3 *p, const ge_cached *q);
 void ge_double_scalarmult_vartime(ge_p2 *r, const unsigned char *a, const ge_p3 *A, const unsigned char *b);
+void ge_scalarmult_vartime(ge_p2 *r, const unsigned char *a, const ge_p3 *A);
 void ge_madd(ge_p1p1 *r, const ge_p3 *p, const ge_precomp *q);
 void ge_msub(ge_p1p1 *r, const ge_p3 *p, const ge_precomp *q);
 void ge_scalarmult_base(ge_p3 *h, const unsigned char *a);
diff --git a/src/ge.c b/src/ge.c
index c4a8d51..3bb0e14 100644
--- a/src/ge.c
+++ b/src/ge.c
@@ -1,3 +1,4 @@
+#include <memory.h>
 #include "../include/ge.h"
 #include "../include/precomp_data.h"
 
@@ -57,6 +58,15 @@ static void slide(signed char *r, const unsigned char *a) {
         }
 }
 
+/*
+ * Warps to ge_double_scalarmult_vartime() => r = a * A + zero * B
+ */
+void ge_scalarmult_vartime(ge_p2 *r, const unsigned char *a, const ge_p3 *A) {
+    unsigned char zero[32];
+    memset(zero, 0, sizeof(zero));
+    ge_double_scalarmult_vartime(r, a, A, zero);
+}
+
 /*
 r = a * A + b * B
 where a = a[0]+256*a[1]+...+256^31 a[31].