Mercurial > dropbear

annotate libtommath/bn_mp_reduce_2k_setup_l.c @ 585:d194db6f9453

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Use system libtomcrypt/libtommath if available. Doesn't currently build due to clash in rsa_key identifier.
author Matt Johnston <matt@ucc.asn.au>
date Wed, 21 Jul 2010 12:38:46 +0000
parents 5ff8218bcee9
children 60fc6476e044
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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.com
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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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24 if ((res = mp_init(&tmp)) != MP_OKAY) {
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25 return res;
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26 }
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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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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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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
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42 /* $Source: /cvs/libtom/libtommath/bn_mp_reduce_2k_setup_l.c,v $ */
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43 /* $Revision: 1.3 $ */
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44 /* $Date: 2006/03/31 14:18:44 $ */