Mercurial > dropbear

annotate libtommath/bn_mp_reduce_is_2k.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +0000
parents f52919ffd3b1
children 1051e4eea25a
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1 #include "tommath_private.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 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* determines if mp_reduce_2k can be used */
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16 int mp_reduce_is_2k(const mp_int *a)
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17 {
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18 int ix, iy, iw;
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19 mp_digit iz;
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20
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21 if (a->used == 0) {
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22 return MP_NO;
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23 } else if (a->used == 1) {
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24 return MP_YES;
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25 } else if (a->used > 1) {
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26 iy = mp_count_bits(a);
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27 iz = 1;
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28 iw = 1;
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29
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30 /* Test every bit from the second digit up, must be 1 */
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31 for (ix = DIGIT_BIT; ix < iy; ix++) {
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32 if ((a->dp[iw] & iz) == 0u) {
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33 return MP_NO;
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34 }
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35 iz <<= 1;
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36 if (iz > (mp_digit)MP_MASK) {
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37 ++iw;
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38 iz = 1;
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39 }
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40 }
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41 }
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42 return MP_YES;
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43 }
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44
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45 #endif
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46
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47 /* ref: HEAD -> master, tag: v1.1.0 */
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48 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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49 /* commit time: 2019-01-28 20:32:32 +0100 */