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authorGluzskiy Alexandr <sss@sss.chaoslab.ru>2017-02-13 07:56:33 +0300
committerGluzskiy Alexandr <sss@sss.chaoslab.ru>2017-02-13 09:09:08 +0300
commit193f645f65ad4ffdec3186e4176b23af10861199 (patch)
treee1b16b48ac74c5f03f99a98798e849f6dd9752cc /libs/libaxolotl/src/curve25519/ed25519/additions/fe_isequal.c
parent36c32a13878d3bd94e88bd9c764f1eadb05ea1ed (diff)
libs:
libaxolotl: updated libaxolotl (libsignal-c) from (https://github.com/WhisperSystems/libsignal-protocol-c)
Diffstat (limited to 'libs/libaxolotl/src/curve25519/ed25519/additions/fe_isequal.c')
-rw-r--r--libs/libaxolotl/src/curve25519/ed25519/additions/fe_isequal.c14
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));
+}