kc3-lang/libtommath/bn_mp_clear.c

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• Hash : 61d9e528
  Author :
  Date : 2019-05-11T10:22:20
  

  hardening: add MP_ZERO_BUFFER, MP_ZERO_DIGITS
  
  * (!) Always zero buffer before freeing if MP_NO_ZERO_ON_FREE is not defined
  * Add MP_NO_ZERO_ON_FREE to disable hardening
  * Add MP_ZERO_BUFFER, MP_ZERO_DIGITS, MP_FREE_BUFFFER, MP_FREE_DIGITS
  * Never use MP_FREE directly, use MP_FREE_DIGITS or MP_FREE_BUFFER
  * Add MP_USE_MEMSET to use memset instead of loop
  * Disable astyle backups which are annonying in the times of git
  

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• bn_mp_clear.c

• #include "tommath_private.h"
  #ifdef BN_MP_CLEAR_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* clear one (frees)  */
  void mp_clear(mp_int *a)
  {
     /* only do anything if a hasn't been freed previously */
     if (a->dp != NULL) {
        /* free ram */
        MP_FREE_DIGITS(a->dp, a->alloc);
  
        /* reset members to make debugging easier */
        a->dp    = NULL;
        a->alloc = a->used = 0;
        a->sign  = MP_ZPOS;
     }
  }
  #endif
  

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