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annotate libtommath/bn_mp_2expt.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
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rev   line source
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1 #include <tommath_private.h>
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2 #ifdef BN_MP_2EXPT_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 /* computes a = 2**b
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19 *
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20 * Simple algorithm which zeroes the int, grows it then just sets one bit
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21 * as required.
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22 */
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23 int
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24 mp_2expt (mp_int * a, int b)
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25 {
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26 int res;
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27
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28 /* zero a as per default */
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29 mp_zero (a);
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30
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31 /* grow a to accomodate the single bit */
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32 if ((res = mp_grow (a, (b / DIGIT_BIT) + 1)) != MP_OKAY) {
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33 return res;
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34 }
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36 /* set the used count of where the bit will go */
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37 a->used = (b / DIGIT_BIT) + 1;
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39 /* put the single bit in its place */
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40 a->dp[b / DIGIT_BIT] = ((mp_digit)1) << (b % DIGIT_BIT);
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41
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42 return MP_OKAY;
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43 }
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44 #endif
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45
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46 /* ref: $Format:%D$ */
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47 /* git commit: $Format:%H$ */
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48 /* commit time: $Format:%ai$ */