kc3-lang/libtommath/bn_mp_set_int.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_set_int.c

• #include "tommath_private.h"
  #ifdef BN_MP_SET_INT_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.
   */
  
  /* set a 32-bit const */
  int mp_set_int(mp_int *a, unsigned long b)
  {
     int     x, res;
  
     mp_zero(a);
  
     /* set four bits at a time */
     for (x = 0; x < 8; x++) {
        /* shift the number up four bits */
        if ((res = mp_mul_2d(a, 4, a)) != MP_OKAY) {
           return res;
        }
  
        /* OR in the top four bits of the source */
        a->dp[0] |= (mp_digit)(b >> 28) & 15uL;
  
        /* shift the source up to the next four bits */
        b <<= 4;
  
        /* ensure that digits are not clamped off */
        a->used += 1;
     }
     mp_clamp(a);
     return MP_OKAY;
  }
  #endif
  
  /* ref:         $Format:%D$ */
  /* git commit:  $Format:%H$ */
  /* commit time: $Format:%ai$ */
  

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