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https://github.com/clearml/dropbear
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2481693cf2
* bn_mp_clear.c is changed so that some vars are volatile, so that the compiler won't optimise away --HG-- branch : libtommath-dropbear extra : convert_revision : 6c790cad5a7fa866ad062cb3a0c279f7ba788583
44 lines
998 B
C
44 lines
998 B
C
#include <tommath.h>
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#ifdef BN_MP_CLEAR_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
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*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
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*
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* The library was designed directly after the MPI library by
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* Michael Fromberger but has been written from scratch with
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* additional optimizations in place.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org
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*/
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/* clear one (frees) */
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void
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mp_clear (mp_int * a)
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{
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volatile mp_digit *p;
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int len;
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/* only do anything if a hasn't been freed previously */
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if (a->dp != NULL) {
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/* first zero the digits */
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len = a->alloc;
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p = a->dp;
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while (len--) {
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*p++ = 0;
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}
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/* free ram */
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XFREE(a->dp);
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/* reset members to make debugging easier */
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a->dp = NULL;
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a->alloc = a->used = 0;
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a->sign = MP_ZPOS;
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}
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}
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#endif
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