Mercurial > dropbear
view bn_mp_clear.c @ 163:8e94663164c6 libtommath LTM_DB_0.44
make pointers volatile so that memory zeroing won't get optimised away
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 02 Jan 2005 17:09:26 +0000 |
parents | d29b64170cf0 |
children |
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#include <tommath.h> #ifdef BN_MP_CLEAR_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, [email protected], http://math.libtomcrypt.org */ /* clear one (frees) */ void mp_clear (mp_int * a) { volatile mp_digit *p; int len; /* only do anything if a hasn't been freed previously */ if (a->dp != NULL) { /* first zero the digits */ len = a->alloc; p = a->dp; while (len--) { *p++ = 0; } /* free ram */ XFREE(a->dp); /* reset members to make debugging easier */ a->dp = NULL; a->alloc = a->used = 0; a->sign = MP_ZPOS; } } #endif