release/src/router/dropbear/libtommath/bn_reverse.c

   1 #include <tommath.h>
   2 #ifdef BN_REVERSE_C
   3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
   4  *
   5  * LibTomMath is a library that provides multiple-precision
   6  * integer arithmetic as well as number theoretic functionality.
   7  *
   8  * The library was designed directly after the MPI library by
   9  * Michael Fromberger but has been written from scratch with
  10  * additional optimizations in place.
  11  *
  12  * The library is free for all purposes without any express
  13  * guarantee it works.
  14  *
  15  * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com
  16  */
  17
  18 /* reverse an array, used for radix code */
  19 void
  20 bn_reverse (unsigned char *s, int len)
  21 {
  22   int     ix, iy;
  23   unsigned char t;
  24
  25   ix = 0;
  26   iy = len - 1;
  27   while (ix < iy) {
  28     t     = s[ix];
  29     s[ix] = s[iy];
  30     s[iy] = t;
  31     ++ix;
  32     --iy;
  33   }
  34 }
  35 #endif
  36
  37 /* $Source: /cvs/libtom/libtommath/bn_reverse.c,v $ */
  38 /* $Revision: 1.3 $ */
  39 /* $Date: 2006/03/31 14:18:44 $ */