New macro, ROTL32.

ChangeLog

+2012-03-31  Niels Möller  <nisse@lysator.liu.se>
+
+	* macros.h (ROTL32): New macro, to replace (almost) all other
+	rotation macros.
+
 2012-03-30  Niels Möller  <nisse@lysator.liu.se>
 
 	* nettle-internal.c (nettle_salsa20): Cipher struct for

macros.h

@@ -119,6 +119,8 @@ do {						\
 		  (dst) += (blocksize),		\
 		  (src) += (blocksize)) )
 
+#define ROTL32(n,x) ((((x))<<(n)) | (((x))>>(32-(n))))
+
 /* Requires that size >= 2 */
 #define INCREMENT(size, ctr)			\
   do {						\