kc3-lang/libtommath/mp_reduce_2k_setup.c

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• Hash : 7a68f128
  Author :
  Date : 2019-10-19T16:24:39
  

  Execute move.sh - Rename files from bn_* to match the function names. * git blame <renamed-file> is not affected * git log --follow <renamed-file> can be used to show log across renames

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• mp_reduce_2k_setup.c

• #include "tommath_private.h"
  #ifdef MP_REDUCE_2K_SETUP_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* determines the setup value */
  mp_err mp_reduce_2k_setup(const mp_int *a, mp_digit *d)
  {
     mp_err err;
     mp_int tmp;
     int    p;
  
     if ((err = mp_init(&tmp)) != MP_OKAY) {
        return err;
     }
  
     p = mp_count_bits(a);
     if ((err = mp_2expt(&tmp, p)) != MP_OKAY) {
        mp_clear(&tmp);
        return err;
     }
  
     if ((err = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) {
        mp_clear(&tmp);
        return err;
     }
  
     *d = tmp.dp[0];
     mp_clear(&tmp);
     return MP_OKAY;
  }
  #endif
  

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