1 files changed, 14 insertions, 0 deletions
diff --git a/libs/libaxolotl/src/curve25519/ed25519/additions/fe_isequal.c b/libs/libaxolotl/src/curve25519/ed25519/additions/fe_isequal.c
new file mode 100644
index 0000000000..67c5d33c96
--- /dev/null
+++ b/libs/libaxolotl/src/curve25519/ed25519/additions/fe_isequal.c
@@ -0,0 +1,14 @@
+#include "fe.h"
+#include "crypto_verify_32.h"
+
+/*
+return 1 if f == g
+return 0 if f != g
+*/
+
+int fe_isequal(const fe f, const fe g)
+{
+  fe h;
+  fe_sub(h, f, g);
+  return 1 ^ (1 & (fe_isnonzero(h) >> 8));
+}