Mercurial > dropbear

annotate libtommath/bn_mp_div_2d.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
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_2D_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 /* shift right by a certain bit count (store quotient in c, optional remainder in d) */
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16 int mp_div_2d(const mp_int *a, int b, mp_int *c, mp_int *d)
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17 {
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18 mp_digit D, r, rr;
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19 int x, res;
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20
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21 /* if the shift count is <= 0 then we do no work */
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22 if (b <= 0) {
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23 res = mp_copy(a, c);
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24 if (d != NULL) {
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25 mp_zero(d);
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26 }
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27 return res;
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28 }
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30 /* copy */
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31 if ((res = mp_copy(a, c)) != MP_OKAY) {
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32 return res;
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33 }
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34 /* 'a' should not be used after here - it might be the same as d */
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35
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36 /* get the remainder */
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37 if (d != NULL) {
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38 if ((res = mp_mod_2d(a, b, d)) != MP_OKAY) {
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39 return res;
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40 }
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41 }
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42
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43 /* shift by as many digits in the bit count */
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44 if (b >= DIGIT_BIT) {
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45 mp_rshd(c, b / DIGIT_BIT);
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46 }
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48 /* shift any bit count < DIGIT_BIT */
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49 D = (mp_digit)(b % DIGIT_BIT);
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50 if (D != 0u) {
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51 mp_digit *tmpc, mask, shift;
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52
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53 /* mask */
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54 mask = ((mp_digit)1 << D) - 1uL;
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55
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56 /* shift for lsb */
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57 shift = (mp_digit)DIGIT_BIT - D;
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58
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59 /* alias */
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60 tmpc = c->dp + (c->used - 1);
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61
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62 /* carry */
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63 r = 0;
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64 for (x = c->used - 1; x >= 0; x--) {
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65 /* get the lower bits of this word in a temp */
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66 rr = *tmpc & mask;
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67
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68 /* shift the current word and mix in the carry bits from the previous word */
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69 *tmpc = (*tmpc >> D) | (r << shift);
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70 --tmpc;
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71
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72 /* set the carry to the carry bits of the current word found above */
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73 r = rr;
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74 }
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75 }
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76 mp_clamp(c);
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77 return MP_OKAY;
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78 }
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79 #endif
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80
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81 /* ref: HEAD -> master, tag: v1.1.0 */
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82 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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83 /* commit time: 2019-01-28 20:32:32 +0100 */