1 #include <tommath.h> 2 #ifdef BN_MP_CLEAR_C 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis 4 * 5 * LibTomMath is a library that provides multiple-precision 6 * integer arithmetic as well as number theoretic functionality. 7 * 8 * The library was designed directly after the MPI library by 9 * Michael Fromberger but has been written from scratch with 10 * additional optimizations in place. 11 * 12 * The library is free for all purposes without any express 13 * guarantee it works. 14 * 15 * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com 16 */ 17 18 /* clear one (frees) */ 19 void mp_clear(mp_int * a)20mp_clear (mp_int * a) 21 { 22 volatile mp_digit *p; 23 int len; 24 25 /* only do anything if a hasn't been freed previously */ 26 if (a->dp != NULL) { 27 /* first zero the digits */ 28 len = a->alloc; 29 p = a->dp; 30 while (len--) { 31 *p++ = 0; 32 } 33 34 /* free ram */ 35 XFREE(a->dp); 36 37 /* reset members to make debugging easier */ 38 a->dp = NULL; 39 a->alloc = a->used = 0; 40 a->sign = MP_ZPOS; 41 } 42 } 43 #endif 44 45 /* $Source: /cvs/libtom/libtommath/bn_mp_clear.c,v $ */ 46 /* $Revision: 1.3 $ */ 47 /* $Date: 2006/03/31 14:18:44 $ */ 48