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annotate bn_mp_reduce_2k_setup_l.c @ 200:c5c969ed76f3 libtommath

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propagate from branch 'au.asn.ucc.matt.ltm-orig' (head 7fa10cba9535de3461cedb14b877c24858826204) to branch 'au.asn.ucc.matt.dropbear.ltm' (head fc26f60de0370ab0a281fa41a2d13fb17c9d90a8)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 11 May 2005 16:15:27 +0000
parents d8254fc979e9
children 97db060d0ef5
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d8254fc979e9 Initial import of libtommath 0.35
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1 #include <tommath.h>
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2 #ifdef BN_MP_REDUCE_2K_SETUP_L_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.org
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16 */
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17
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18 /* determines the setup value */
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19 int mp_reduce_2k_setup_l(mp_int *a, mp_int *d)
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20 {
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21 int res;
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22 mp_int tmp;
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23
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24 if ((res = mp_init(&tmp)) != 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_2expt(&tmp, mp_count_bits(a))) != MP_OKAY) {
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29 goto ERR;
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30 }
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31
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32 if ((res = s_mp_sub(&tmp, a, d)) != MP_OKAY) {
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33 goto ERR;
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34 }
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35
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36 ERR:
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37 mp_clear(&tmp);
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38 return res;
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39 }
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40 #endif