Mercurial > dropbear
annotate libtommath/bn_mp_mul.c @ 1629:258b57b208ae
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> |
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date | Wed, 20 Mar 2019 15:03:40 +0100 |
parents | 8bba51a55704 |
children | f52919ffd3b1 |
rev | line source |
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1436 | 1 #include <tommath_private.h> |
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2 #ifdef BN_MP_MUL_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 * |
1436 | 15 * Tom St Denis, [email protected], http://libtom.org |
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16 */ |
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17 |
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18 /* high level multiplication (handles sign) */ |
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19 int mp_mul (mp_int * a, mp_int * b, mp_int * c) |
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20 { |
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21 int res, neg; |
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22 neg = (a->sign == b->sign) ? MP_ZPOS : MP_NEG; |
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23 |
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24 /* use Toom-Cook? */ |
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25 #ifdef BN_MP_TOOM_MUL_C |
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26 if (MIN (a->used, b->used) >= TOOM_MUL_CUTOFF) { |
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27 res = mp_toom_mul(a, b, c); |
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28 } else |
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29 #endif |
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30 #ifdef BN_MP_KARATSUBA_MUL_C |
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31 /* use Karatsuba? */ |
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32 if (MIN (a->used, b->used) >= KARATSUBA_MUL_CUTOFF) { |
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33 res = mp_karatsuba_mul (a, b, c); |
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34 } else |
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35 #endif |
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36 { |
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37 /* can we use the fast multiplier? |
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38 * |
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39 * The fast multiplier can be used if the output will |
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40 * have less than MP_WARRAY digits and the number of |
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41 * digits won't affect carry propagation |
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42 */ |
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43 int digs = a->used + b->used + 1; |
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44 |
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45 #ifdef BN_FAST_S_MP_MUL_DIGS_C |
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46 if ((digs < MP_WARRAY) && |
1436 | 47 (MIN(a->used, b->used) <= |
48 (1 << ((CHAR_BIT * sizeof(mp_word)) - (2 * DIGIT_BIT))))) { | |
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49 res = fast_s_mp_mul_digs (a, b, c, digs); |
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50 } else |
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51 #endif |
1436 | 52 { |
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53 #ifdef BN_S_MP_MUL_DIGS_C |
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54 res = s_mp_mul (a, b, c); /* uses s_mp_mul_digs */ |
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55 #else |
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56 res = MP_VAL; |
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57 #endif |
1436 | 58 } |
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59 } |
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60 c->sign = (c->used > 0) ? neg : MP_ZPOS; |
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61 return res; |
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62 } |
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63 #endif |
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64 |
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65 /* ref: $Format:%D$ */ |
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66 /* git commit: $Format:%H$ */ |
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67 /* commit time: $Format:%ai$ */ |