Merge pull request #1059 from daverodgman/ct_memcmp_fix

Constant time memcmp check for 16-bit int
diff --git a/ChangeLog.d/safer-ct.txt b/ChangeLog.d/safer-ct.txt
new file mode 100644
index 0000000..0a5b632
--- /dev/null
+++ b/ChangeLog.d/safer-ct.txt
@@ -0,0 +1,6 @@
+Security
+   * Updates to constant-time C code so that compilers are less likely to use
+     conditional instructions, which can have an observable difference in
+     timing. (Clang has been seen to do this.) Also introduce assembly
+     implementations for 32- and 64-bit Arm and for x86 and x86-64, which are
+     guaranteed not to use conditional instructions.