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annotate libtommath/bn_mp_neg.c @ 368:ed910547d449

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author Matt Johnston <matt@ucc.asn.au>
date Thu, 02 Nov 2006 14:49:20 +0000
parents eed26cff980b
children 5ff8218bcee9
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1 #include <tommath.h>
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2 #ifdef BN_MP_NEG_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 /* b = -a */
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19 int mp_neg (mp_int * a, mp_int * b)
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20 {
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21 int res;
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22 if (a != b) {
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23 if ((res = mp_copy (a, b)) != MP_OKAY) {
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24 return res;
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25 }
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26 }
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27
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28 if (mp_iszero(b) != MP_YES) {
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29 b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS;
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30 } else {
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31 b->sign = MP_ZPOS;
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32 }
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33
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34 return MP_OKAY;
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35 }
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36 #endif