kc3-lang/libtommath/bn_mp_reduce_2k_setup.c

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• Hash : 9034e712
  Author :
  Date : 2018-05-02T21:43:17
  

  Do not use installed headers for building

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• bn_mp_reduce_2k_setup.c

• #include "tommath_private.h"
  #ifdef BN_MP_REDUCE_2K_SETUP_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.
   */
  
  /* determines the setup value */
  int mp_reduce_2k_setup(const mp_int *a, mp_digit *d)
  {
     int res, p;
     mp_int tmp;
  
     if ((res = mp_init(&tmp)) != MP_OKAY) {
        return res;
     }
  
     p = mp_count_bits(a);
     if ((res = mp_2expt(&tmp, p)) != MP_OKAY) {
        mp_clear(&tmp);
        return res;
     }
  
     if ((res = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) {
        mp_clear(&tmp);
        return res;
     }
  
     *d = tmp.dp[0];
     mp_clear(&tmp);
     return MP_OKAY;
  }
  #endif
  
  /* ref:         $Format:%D$ */
  /* git commit:  $Format:%H$ */
  /* commit time: $Format:%ai$ */
  

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