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142
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1 #include <tommath.h> |
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2 #ifdef BN_MP_INIT_SIZE_C |
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2
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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 /* init an mp_init for a given size */ |
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19 int mp_init_size (mp_int * a, int size) |
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20 { |
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142
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21 int x; |
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22 |
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2
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23 /* pad size so there are always extra digits */ |
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24 size += (MP_PREC * 2) - (size % MP_PREC); |
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25 |
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26 /* alloc mem */ |
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142
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27 a->dp = OPT_CAST(mp_digit) XMALLOC (sizeof (mp_digit) * size); |
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2
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28 if (a->dp == NULL) { |
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29 return MP_MEM; |
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30 } |
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142
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31 |
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32 /* set the members */ |
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2
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33 a->used = 0; |
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34 a->alloc = size; |
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35 a->sign = MP_ZPOS; |
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36 |
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142
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37 /* zero the digits */ |
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38 for (x = 0; x < size; x++) { |
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39 a->dp[x] = 0; |
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40 } |
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41 |
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2
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42 return MP_OKAY; |
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43 } |
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142
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44 #endif |
