+
−/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+
− *
+
− * LibTomCrypt is a library that provides various cryptographic
+
− * algorithms in a highly modular and flexible manner.
+
− *
+
− * The library is free for all purposes without any express
+
− * guarantee it works.
+
− *
+
− * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
+
− */
+
−
+
−/**
+
−   @file ocb_ntz.c
+
−   OCB implementation, internal function, by Tom St Denis
+
−*/
+
−
+
−#include "tomcrypt.h"
+
−
+
−#ifdef LTC_OCB_MODE
+
−
+
−/**
+
−   Returns the number of leading zero bits [from lsb up]
+
−   @param x  The 32-bit value to observe
+
−   @return   The number of bits [from the lsb up] that are zero
+
−*/
+
−int ocb_ntz(unsigned long x)
+
−{
+
−   int c;
+
−   x &= 0xFFFFFFFFUL;
+
−   c = 0;
+
−   while ((x & 1) == 0) {
+
−      ++c;
+
−      x >>= 1;
+
−   }
+
−   return c;
+
−}
+
−
+
−#endif
+
−
+
−/* $Source$ */
+
−/* $Revision$ */
+
−/* $Date$ */