kc3-lang/libtommath/s_mp_get_bit.c

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• Hash : 448f35e2
  Author :
  Date : 2019-10-29T20:07:29
  

  simplifications: prime functions

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• s_mp_get_bit.c

• #include "tommath_private.h"
  #ifdef S_MP_GET_BIT_C
  
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* Get bit at position b and return true if the bit is 1, false if it is 0 */
  bool s_mp_get_bit(const mp_int *a, int b)
  {
     mp_digit bit;
     int limb = b / MP_DIGIT_BIT;
  
     if (limb < 0 || limb >= a->used) {
        return false;
     }
  
     bit = (mp_digit)1 << (b % MP_DIGIT_BIT);
     return ((a->dp[limb] & bit) != 0u);
  }
  
  #endif
  

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