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annotate bn_mp_mulmod.c @ 2:86e0b50a9b58 libtommath-orig ltm-0.30-orig

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ltm 0.30 orig import
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:25:22 +0000
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children d29b64170cf0
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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 /* d = a * b (mod c) */
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18 int
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19 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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24 if ((res = mp_init (&t)) != MP_OKAY) {
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25 return res;
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26 }
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27
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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 }