Mercurial > dropbear
annotate libtommath/bn_mp_clear.c @ 374:87ae4565679d channel-fix
merge of 'a94c5265558121fe936519b5d9a5eb27f95e9d9d'
and 'd348546b80847bc0d42a7b5208bb31a54f1fdfaf'
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 05 Dec 2006 13:28:44 +0000 |
parents | eed26cff980b |
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284
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1 #include <tommath.h> |
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2 #ifdef BN_MP_CLEAR_C |
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
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4 * |
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5 * LibTomMath is a library that provides multiple-precision |
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6 * integer arithmetic as well as number theoretic functionality. |
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7 * |
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8 * The library was designed directly after the MPI library by |
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9 * Michael Fromberger but has been written from scratch with |
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10 * additional optimizations in place. |
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11 * |
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12 * The library is free for all purposes without any express |
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13 * guarantee it works. |
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14 * |
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.org |
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16 */ |
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17 |
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18 /* clear one (frees) */ |
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19 void |
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20 mp_clear (mp_int * a) |
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21 { |
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22 volatile mp_digit *p; |
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23 int len; |
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24 |
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25 /* only do anything if a hasn't been freed previously */ |
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26 if (a->dp != NULL) { |
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27 /* first zero the digits */ |
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28 len = a->alloc; |
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29 p = a->dp; |
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30 while (len--) { |
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31 *p++ = 0; |
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32 } |
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33 |
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34 /* free ram */ |
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35 XFREE(a->dp); |
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36 |
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37 /* reset members to make debugging easier */ |
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38 a->dp = NULL; |
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39 a->alloc = a->used = 0; |
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40 a->sign = MP_ZPOS; |
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41 } |
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42 } |
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43 #endif |