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annotate libtommath/bn_mp_invmod.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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1 #include <tommath_private.h>
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2 #ifdef BN_MP_INVMOD_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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18 /* hac 14.61, pp608 */
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19 int mp_invmod (mp_int * a, mp_int * b, mp_int * c)
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20 {
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21 /* b cannot be negative */
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22 if ((b->sign == MP_NEG) || (mp_iszero(b) == MP_YES)) {
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23 return MP_VAL;
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24 }
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26 #ifdef BN_FAST_MP_INVMOD_C
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27 /* if the modulus is odd we can use a faster routine instead */
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28 if ((mp_isodd(b) == MP_YES) && (mp_cmp_d(b, 1) != MP_EQ)) {
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29 return fast_mp_invmod (a, b, c);
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30 }
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31 #endif
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33 #ifdef BN_MP_INVMOD_SLOW_C
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34 return mp_invmod_slow(a, b, c);
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35 #else
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36 return MP_VAL;
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37 #endif
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38 }
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39 #endif
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40
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41 /* ref: $Format:%D$ */
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42 /* git commit: $Format:%H$ */
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43 /* commit time: $Format:%ai$ */