1 files changed, 43 insertions, 0 deletions
diff --git a/lib/utils/rotate.h b/lib/utils/rotate.h
new file mode 100644
index 000000000..2593010b4
--- /dev/null
+++ b/lib/utils/rotate.h
@@ -0,0 +1,43 @@
+/*
+* Word Rotation Operations
+* (C) 1999-2008 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_WORD_ROTATE_H__
+#define BOTAN_WORD_ROTATE_H__
+
+#include <botan/types.h>
+
+namespace Botan {
+
+/**
+* Bit rotation left
+* @param input the input word
+* @param rot the number of bits to rotate
+* @return input rotated left by rot bits
+*/
+template<typename T> inline T rotate_left(T input, size_t rot)
+   {
+   if(rot == 0)
+      return input;
+   return static_cast<T>((input << rot) | (input >> (8*sizeof(T)-rot)));;
+   }
+
+/**
+* Bit rotation right
+* @param input the input word
+* @param rot the number of bits to rotate
+* @return input rotated right by rot bits
+*/
+template<typename T> inline T rotate_right(T input, size_t rot)
+   {
+   if(rot == 0)
+      return input;
+   return static_cast<T>((input >> rot) | (input << (8*sizeof(T)-rot)));
+   }
+
+}
+
+#endif