Mercurial > dropbear

annotate libtommath/bn_mp_and.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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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_AND_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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5
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6 /* two complement and */
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7 mp_err mp_and(const mp_int *a, const mp_int *b, mp_int *c)
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8 {
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9 int used = MP_MAX(a->used, b->used) + 1, i;
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10 mp_err err;
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11 mp_digit ac = 1, bc = 1, cc = 1;
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12 mp_sign csign = ((a->sign == MP_NEG) && (b->sign == MP_NEG)) ? MP_NEG : MP_ZPOS;
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13
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14 if (c->alloc < used) {
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15 if ((err = mp_grow(c, used)) != MP_OKAY) {
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16 return err;
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17 }
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18 }
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19
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20 for (i = 0; i < used; i++) {
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21 mp_digit x, y;
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22
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23 /* convert to two complement if negative */
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24 if (a->sign == MP_NEG) {
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25 ac += (i >= a->used) ? MP_MASK : (~a->dp[i] & MP_MASK);
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26 x = ac & MP_MASK;
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27 ac >>= MP_DIGIT_BIT;
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28 } else {
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29 x = (i >= a->used) ? 0uL : a->dp[i];
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30 }
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31
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32 /* convert to two complement if negative */
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33 if (b->sign == MP_NEG) {
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34 bc += (i >= b->used) ? MP_MASK : (~b->dp[i] & MP_MASK);
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35 y = bc & MP_MASK;
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36 bc >>= MP_DIGIT_BIT;
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37 } else {
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38 y = (i >= b->used) ? 0uL : b->dp[i];
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39 }
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40
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41 c->dp[i] = x & y;
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42
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43 /* convert to to sign-magnitude if negative */
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44 if (csign == MP_NEG) {
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45 cc += ~c->dp[i] & MP_MASK;
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46 c->dp[i] = cc & MP_MASK;
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47 cc >>= MP_DIGIT_BIT;
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48 }
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49 }
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50
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51 c->used = used;
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52 c->sign = csign;
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53 mp_clamp(c);
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54 return MP_OKAY;
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55 }
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56 #endif