1 files changed, 15 insertions, 0 deletions
diff --git a/cxx/include/aesnixx/mode.hpp b/cxx/include/aesnixx/mode.hpp
index ec26170..9bcbbd5 100644
--- a/cxx/include/aesnixx/mode.hpp
+++ b/cxx/include/aesnixx/mode.hpp
@@ -10,7 +10,22 @@
 
 #include <aesni/all.h>
 
+#include <type_traits>
+
 namespace aesni
 {
     typedef AesNI_Mode Mode;
+
+    template <Mode mode>
+    struct ModeRequiresInitializationVector : public std::true_type
+    { };
+
+    template <>
+    struct ModeRequiresInitializationVector<AESNI_ECB> : public std::false_type
+    { };
+
+    inline bool mode_requires_initialization_vector(Mode mode)
+    {
+        return mode != AESNI_ECB;
+    }
 }