text: #include <tommath_private.h>
  #ifdef BN_MP_SQR_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.
   */
  
  /* computes b = a*a */
  int mp_sqr(const mp_int *a, mp_int *b)
  {
     int     res;
  
  #ifdef BN_MP_TOOM_SQR_C
     /* use Toom-Cook? */
     if (a->used >= TOOM_SQR_CUTOFF) {
        res = mp_toom_sqr(a, b);
        /* Karatsuba? */
     } else
  #endif
  #ifdef BN_MP_KARATSUBA_SQR_C
        if (a->used >= KARATSUBA_SQR_CUTOFF) {
           res = mp_karatsuba_sqr(a, b);
        } else
  #endif
        {
  #ifdef BN_FAST_S_MP_SQR_C
           /* can we use the fast comba multiplier? */
           if ((((a->used * 2) + 1) < (int)MP_WARRAY) &&
               (a->used <
                (int)(1u << (((sizeof(mp_word) * (size_t)CHAR_BIT) - (2u * (size_t)DIGIT_BIT)) - 1u)))) {
              res = fast_s_mp_sqr(a, b);
           } else
  #endif
           {
  #ifdef BN_S_MP_SQR_C
              res = s_mp_sqr(a, b);
  #else
              res = MP_VAL;
  #endif
           }
        }
     b->sign = MP_ZPOS;
     return res;
  }
  #endif
  
  /* ref:         $Format:%D$ */
  /* git commit:  $Format:%H$ */
  /* commit time: $Format:%ai$ */
  