kc3-lang/libtommath/bn_mp_and.c

• Show log

  Commit

• Hash : 4534056c
  Author :
  Date : 2019-05-13T00:22:18
  

  use enums mp_err, mp_ord, mp_bool, mp_sign * MP_USE_ENUMS enables enums * Wc++-compat catches some implicit conversions if MP_USE_ENUMS is defined * 100% backwards compatible API/ABI if MP_USE_ENUMS is not defined

Download

• bn_mp_and.c

• #include "tommath_private.h"
  #ifdef BN_MP_AND_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* AND two ints together */
  mp_err mp_and(const mp_int *a, const mp_int *b, mp_int *c)
  {
     int ix, px;
     mp_err res;
     mp_int  t;
     const mp_int *x;
  
     if (a->used > b->used) {
        if ((res = mp_init_copy(&t, a)) != MP_OKAY) {
           return res;
        }
        px = b->used;
        x = b;
     } else {
        if ((res = mp_init_copy(&t, b)) != MP_OKAY) {
           return res;
        }
        px = a->used;
        x = a;
     }
  
     for (ix = 0; ix < px; ix++) {
        t.dp[ix] &= x->dp[ix];
     }
  
     /* zero digits above the last from the smallest mp_int */
     MP_ZERO_DIGITS(t.dp + ix, t.used - ix);
  
     mp_clamp(&t);
     mp_exch(c, &t);
     mp_clear(&t);
     return MP_OKAY;
  }
  #endif
  

Download