1 files changed, 10 insertions, 0 deletions

diff --git a/nacl/curvecp/byte_isequal.c b/nacl/curvecp/byte_isequal.c
new file mode 100644
index 00000000..625d361e
--- /dev/null
+++ b/nacl/curvecp/byte_isequal.c
@@ -0,0 +1,10 @@
+#include "byte.h"
+
+int byte_isequal(const void *yv,long long ylen,const void *xv)
+{
+  const unsigned char *y = yv;
+  const unsigned char *x = xv;
+  unsigned char diff = 0;
+  while (ylen > 0) { diff |= (*y++ ^ *x++); --ylen; }
+  return (256 - (unsigned int) diff) >> 8;
+}