kc3-lang/libtommath/bn_mp_reduce_setup.c

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• Hash : ff561404
  Author :
  Date : 2019-04-07T15:29:11
  

  shorter headers

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• bn_mp_reduce_setup.c

• #include "tommath_private.h"
  #ifdef BN_MP_REDUCE_SETUP_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* pre-calculate the value required for Barrett reduction
   * For a given modulus "b" it calulates the value required in "a"
   */
  int mp_reduce_setup(mp_int *a, const mp_int *b)
  {
     int     res;
  
     if ((res = mp_2expt(a, b->used * 2 * DIGIT_BIT)) != MP_OKAY) {
        return res;
     }
     return mp_div(a, b, a, NULL);
  }
  #endif
  

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