bn_mp_get_bit.c

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Author : czurnieden
Date : 2018-05-04 00:01:45
Hash : 44ccca75
Message : the lost files from the last commit

bn_mp_get_bit.c

#include "tommath_private.h"
#ifdef BN_MP_GET_BIT_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.
 */

/* Checks the bit at position b and returns MP_YES
   if the bit is 1, MP_NO if it is 0 and MP_VAL
   in case of error */
int mp_get_bit(const mp_int *a, int b)
{
   int limb;
   mp_digit bit, isset;

   if (b < 0) {
      return MP_VAL;
   }

   limb = b / DIGIT_BIT;
   bit = (mp_digit)1 << ((mp_digit)b % DIGIT_BIT);
   isset = a->dp[limb] & bit;
   return (isset != 0) ? MP_YES : MP_NO;
}

#endif

kc3-lang/libtommath/bn_mp_get_bit.c

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