view libtommath/bn_mp_neg.c @ 931:ac340d3e452e

Fix pubkey auth if the first key presented fails (infinite loop of auth requests). Regresssion in ff597bf2cfb0
author Matt Johnston <matt@ucc.asn.au>
date Wed, 23 Apr 2014 16:22:50 +0800
parents 5ff8218bcee9
children 60fc6476e044
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#include <tommath.h>
#ifdef BN_MP_NEG_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis
 *
 * LibTomMath is a library that provides multiple-precision
 * integer arithmetic as well as number theoretic functionality.
 *
 * The library was 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, [email protected], http://math.libtomcrypt.com
 */

/* b = -a */
int mp_neg (mp_int * a, mp_int * b)
{
  int     res;
  if (a != b) {
     if ((res = mp_copy (a, b)) != MP_OKAY) {
        return res;
     }
  }

  if (mp_iszero(b) != MP_YES) {
     b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS;
  } else {
     b->sign = MP_ZPOS;
  }

  return MP_OKAY;
}
#endif

/* $Source: /cvs/libtom/libtommath/bn_mp_neg.c,v $ */
/* $Revision: 1.3 $ */
/* $Date: 2006/03/31 14:18:44 $ */