Mercurial > dropbear

annotate libtommath/bn_mp_div_2.c @ 1629:258b57b208ae

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Fix for issue successfull login of disabled user (#78) This commit introduces fix for scenario: 1. Root login disabled on dropbear 2. PAM authentication model enabled While login as root user, after prompt for password user is being notified about login failrue, but after second attempt of prompt for password within same session, login becames succesfull. Signed-off-by: Pawel Rapkiewicz <[email protected]>
author vincentto13 <33652988+vincentto13@users.noreply.github.com>
date Wed, 20 Mar 2019 15:03:40 +0100
parents 8bba51a55704
children f52919ffd3b1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #include <tommath_private.h>
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2 #ifdef BN_MP_DIV_2_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://libtom.org
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16 */
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17
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18 /* b = a/2 */
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19 int mp_div_2(mp_int * a, mp_int * b)
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20 {
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21 int x, res, oldused;
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22
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23 /* copy */
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24 if (b->alloc < a->used) {
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25 if ((res = mp_grow (b, a->used)) != MP_OKAY) {
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26 return res;
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27 }
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28 }
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29
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30 oldused = b->used;
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31 b->used = a->used;
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32 {
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33 mp_digit r, rr, *tmpa, *tmpb;
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34
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35 /* source alias */
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36 tmpa = a->dp + b->used - 1;
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37
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38 /* dest alias */
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39 tmpb = b->dp + b->used - 1;
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40
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41 /* carry */
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42 r = 0;
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43 for (x = b->used - 1; x >= 0; x--) {
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44 /* get the carry for the next iteration */
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45 rr = *tmpa & 1;
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46
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47 /* shift the current digit, add in carry and store */
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48 *tmpb-- = (*tmpa-- >> 1) | (r << (DIGIT_BIT - 1));
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49
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50 /* forward carry to next iteration */
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51 r = rr;
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52 }
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53
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54 /* zero excess digits */
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55 tmpb = b->dp + b->used;
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56 for (x = b->used; x < oldused; x++) {
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57 *tmpb++ = 0;
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58 }
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59 }
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60 b->sign = a->sign;
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61 mp_clamp (b);
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62 return MP_OKAY;
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63 }
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64 #endif
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65
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66 /* ref: $Format:%D$ */
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67 /* git commit: $Format:%H$ */
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68 /* commit time: $Format:%ai$ */