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kc3-lang/libtommath/bn_mp_2expt.c

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  • Author : Tom St Denis
    Date : 2003-02-28 16:08:34
    Hash : 57354e11
    Message : added libtommath-0.12

  • bn_mp_2expt.c 
  • /* LibTomMath, multiple-precision integer library -- Tom St Denis
 *
 * LibTomMath is library that provides for multiple-precision
 * integer arithmetic as well as number theoretic functionality.
 *
 * The library is 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, tomstdenis@iahu.ca, http://libtommath.iahu.ca
 */
#include <tommath.h>

/* computes a = 2^b */
int
mp_2expt (mp_int * a, int b)
{
  int       res;

  mp_zero (a);
  if ((res = mp_grow (a, b / DIGIT_BIT + 1)) != MP_OKAY) {
    return res;
  }
  a->used = b / DIGIT_BIT + 1;
  a->dp[b / DIGIT_BIT] = 1 << (b % DIGIT_BIT);

  return MP_OKAY;
}