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1 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
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2 * |
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3 * LibTomMath is a library that provides multiple-precision |
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4 * integer arithmetic as well as number theoretic functionality. |
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5 * |
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6 * The library was designed directly after the MPI library by |
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7 * Michael Fromberger but has been written from scratch with |
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8 * additional optimizations in place. |
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9 * |
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10 * The library is free for all purposes without any express |
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11 * guarantee it works. |
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12 * |
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13 * Tom St Denis, [email protected], http://math.libtomcrypt.org |
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14 */ |
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15 #include <tommath.h> |
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16 |
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17 /* b = |a| |
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18 * |
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19 * Simple function copies the input and fixes the sign to positive |
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20 */ |
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21 int |
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22 mp_abs (mp_int * a, mp_int * b) |
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23 { |
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24 int res; |
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25 |
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26 /* copy a to b */ |
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27 if (a != b) { |
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28 if ((res = mp_copy (a, b)) != MP_OKAY) { |
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29 return res; |
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30 } |
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31 } |
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32 |
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33 /* force the sign of b to positive */ |
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34 b->sign = MP_ZPOS; |
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35 |
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36 return MP_OKAY; |
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37 } |
