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kc3-lang/libtommath/bn_mp_clamp.c

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  • Author : Tom St Denis
    Date : 2003-03-29 18:16:01
    Hash : 14161e84
    Message : added libtommath-0.16

  • bn_mp_clamp.c 
  • /* LibTomMath, multiple-precision integer library -- Tom St Denis
 *
 * LibTomMath is library that provides for multiple-precision
 * integer arithmetic as well as number theoretic functionality.
 *
 * The library is designed directly after the MPI library by
 * Michael Fromberger but has been written from scratch with
 * additional optimizations in place.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org
 */
#include <tommath.h>

/* trim unused digits 
 *
 * This is used to ensure that leading zero digits are
 * trimed and the leading "used" digit will be non-zero
 * Typically very fast.  Also fixes the sign if there
 * are no more leading digits
 */
void
mp_clamp (mp_int * a)
{
  while (a->used > 0 && a->dp[a->used - 1] == 0) {
    --(a->used);
  }
  if (a->used == 0) {
    a->sign = MP_ZPOS;
  }
}