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annotate libtommath/bn_mp_mulmod.c @ 1493:72fd994fe7bd

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Update build instructions for localoptions, and tidy
author Matt Johnston <matt@ucc.asn.au>
date Wed, 14 Feb 2018 00:24:32 +0800
parents 8bba51a55704
children f52919ffd3b1
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1 #include <tommath_private.h>
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2 #ifdef BN_MP_MULMOD_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://libtom.org
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16 */
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17
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18 /* d = a * b (mod c) */
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19 int mp_mulmod (mp_int * a, mp_int * b, mp_int * c, mp_int * d)
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20 {
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21 int res;
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22 mp_int t;
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23
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4fbf9a7556ed Use mp_init_size() to avoid some mp_grow()s
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24 if ((res = mp_init_size (&t, c->used)) != MP_OKAY) {
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25 return res;
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26 }
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28 if ((res = mp_mul (a, b, &t)) != MP_OKAY) {
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29 mp_clear (&t);
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30 return res;
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31 }
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32 res = mp_mod (&t, c, d);
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33 mp_clear (&t);
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34 return res;
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35 }
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36 #endif
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37
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38 /* ref: $Format:%D$ */
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39 /* git commit: $Format:%H$ */
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40 /* commit time: $Format:%ai$ */