c3-lang/libtommath/bn_mp_reduce_is_2k_l.c

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• Hash : 4e3f1344
  Author :
  Date : 2015-11-12T01:49:07
  

  provide tommath_private.h tommath.h contains declarations for the public part of the library. tommath_private.h contains the functions which are private to ltm and should not be exposed to the public.

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• bn_mp_reduce_is_2k_l.c

• #include <tommath_private.h>
  #ifdef BN_MP_REDUCE_IS_2K_L_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.
   *
   * Tom St Denis, tstdenis82@gmail.com, http://libtom.org
   */
  
  /* determines if reduce_2k_l can be used */
  int mp_reduce_is_2k_l(mp_int *a)
  {
     int ix, iy;
     
     if (a->used == 0) {
        return MP_NO;
     } else if (a->used == 1) {
        return MP_YES;
     } else if (a->used > 1) {
        /* if more than half of the digits are -1 we're sold */
        for (iy = ix = 0; ix < a->used; ix++) {
            if (a->dp[ix] == MP_MASK) {
                ++iy;
            }
        }
        return (iy >= (a->used/2)) ? MP_YES : MP_NO;
        
     }
     return MP_NO;
  }
  
  #endif
  
  /* $Source$ */
  /* $Revision$ */
  /* $Date$ */
  

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