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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, tomstdenis@gmail.com, http://math.libtomcrypt.com |
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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 |
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37 | |
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38 | /* $Source: /cvsroot/tcl/libtommath/bn_mp_neg.c,v $ */ |
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39 | /* $Revision: 1.1.1.4 $ */ |
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40 | /* $Date: 2006/12/01 00:08:11 $ */ |
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