Mercurial > dropbear

annotate libtommath/bn_mp_mul_2.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 1051e4eea25a
children
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_MUL_2_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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6 /* b = a*2 */
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7 mp_err mp_mul_2(const mp_int *a, mp_int *b)
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8 {
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9 int x, oldused;
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10 mp_err err;
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11
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12 /* grow to accomodate result */
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13 if (b->alloc < (a->used + 1)) {
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14 if ((err = mp_grow(b, a->used + 1)) != MP_OKAY) {
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15 return err;
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16 }
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17 }
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19 oldused = b->used;
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20 b->used = a->used;
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21
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22 {
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23 mp_digit r, rr, *tmpa, *tmpb;
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24
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25 /* alias for source */
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26 tmpa = a->dp;
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27
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28 /* alias for dest */
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29 tmpb = b->dp;
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30
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31 /* carry */
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32 r = 0;
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33 for (x = 0; x < a->used; x++) {
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34
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35 /* get what will be the *next* carry bit from the
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36 * MSB of the current digit
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37 */
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38 rr = *tmpa >> (mp_digit)(MP_DIGIT_BIT - 1);
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39
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40 /* now shift up this digit, add in the carry [from the previous] */
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41 *tmpb++ = ((*tmpa++ << 1uL) | r) & MP_MASK;
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42
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43 /* copy the carry that would be from the source
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44 * digit into the next iteration
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45 */
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46 r = rr;
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47 }
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49 /* new leading digit? */
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50 if (r != 0u) {
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51 /* add a MSB which is always 1 at this point */
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52 *tmpb = 1;
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53 ++(b->used);
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54 }
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55
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56 /* now zero any excess digits on the destination
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57 * that we didn't write to
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58 */
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59 MP_ZERO_DIGITS(b->dp + b->used, oldused - b->used);
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60 }
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61 b->sign = a->sign;
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62 return MP_OKAY;
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63 }
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64 #endif