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| [25] | 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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