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annotate libtommath/bn_mp_reduce_is_2k.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_REDUCE_IS_2K_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 mp_reduce_2k can be used */
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19 int mp_reduce_is_2k(mp_int *a)
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20 {
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21 int ix, iy, iw;
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22 mp_digit iz;
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23
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24 if (a->used == 0) {
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25 return MP_NO;
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26 } else if (a->used == 1) {
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27 return MP_YES;
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28 } else if (a->used > 1) {
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29 iy = mp_count_bits(a);
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30 iz = 1;
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31 iw = 1;
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33 /* Test every bit from the second digit up, must be 1 */
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34 for (ix = DIGIT_BIT; ix < iy; ix++) {
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35 if ((a->dp[iw] & iz) == 0) {
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36 return MP_NO;
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37 }
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38 iz <<= 1;
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39 if (iz > (mp_digit)MP_MASK) {
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40 ++iw;
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41 iz = 1;
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42 }
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43 }
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44 }
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45 return MP_YES;
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46 }
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47
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48 #endif
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49
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50 /* $Source: /cvs/libtom/libtommath/bn_mp_reduce_is_2k.c,v $ */
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51 /* $Revision: 1.3 $ */
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52 /* $Date: 2006/03/31 14:18:44 $ */