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annotate libtommath/bn_mp_prime_is_divisible.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 5ff8218bcee9
children 60fc6476e044
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1 #include <tommath.h>
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2 #ifdef BN_MP_PRIME_IS_DIVISIBLE_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://math.libtomcrypt.com
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16 */
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17
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18 /* determines if an integers is divisible by one
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19 * of the first PRIME_SIZE primes or not
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20 *
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21 * sets result to 0 if not, 1 if yes
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22 */
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23 int mp_prime_is_divisible (mp_int * a, int *result)
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24 {
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25 int err, ix;
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26 mp_digit res;
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28 /* default to not */
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29 *result = MP_NO;
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31 for (ix = 0; ix < PRIME_SIZE; ix++) {
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32 /* what is a mod LBL_prime_tab[ix] */
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33 if ((err = mp_mod_d (a, ltm_prime_tab[ix], &res)) != MP_OKAY) {
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34 return err;
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35 }
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37 /* is the residue zero? */
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38 if (res == 0) {
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39 *result = MP_YES;
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40 return MP_OKAY;
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41 }
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42 }
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44 return MP_OKAY;
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45 }
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46 #endif
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47
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48 /* $Source: /cvs/libtom/libtommath/bn_mp_prime_is_divisible.c,v $ */
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49 /* $Revision: 1.3 $ */
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50 /* $Date: 2006/03/31 14:18:44 $ */