Mercurial > dropbear

annotate libtommath/bn_mp_lcm.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)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
1 #include "tommath_private.h"
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2 #ifdef BN_MP_LCM_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 /* computes least common multiple as |a*b|/(a, b) */
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7 mp_err mp_lcm(const mp_int *a, const mp_int *b, mp_int *c)
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8 {
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9 mp_err err;
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parents: 1470
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10 mp_int t1, t2;
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12
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13 if ((err = mp_init_multi(&t1, &t2, NULL)) != MP_OKAY) {
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14 return err;
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parents: 1470
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15 }
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16
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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17 /* t1 = get the GCD of the two inputs */
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18 if ((err = mp_gcd(a, b, &t1)) != MP_OKAY) {
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19 goto LBL_T;
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parents: 1470
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20 }
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21
1655
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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22 /* divide the smallest by the GCD */
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parents: 1470
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23 if (mp_cmp_mag(a, b) == MP_LT) {
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parents: 1470
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24 /* store quotient in t2 such that t2 * b is the LCM */
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25 if ((err = mp_div(a, &t1, &t2, NULL)) != MP_OKAY) {
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parents: 1470
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26 goto LBL_T;
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27 }
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28 err = mp_mul(b, &t2, c);
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parents: 1470
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29 } else {
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parents: 1470
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30 /* store quotient in t2 such that t2 * a is the LCM */
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31 if ((err = mp_div(b, &t1, &t2, NULL)) != MP_OKAY) {
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parents: 1470
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32 goto LBL_T;
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parents: 1470
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33 }
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34 err = mp_mul(a, &t2, c);
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parents: 1470
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35 }
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parents:
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36
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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37 /* fix the sign to positive */
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parents: 1470
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38 c->sign = MP_ZPOS;
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40 LBL_T:
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parents: 1470
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41 mp_clear_multi(&t1, &t2, NULL);
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42 return err;
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43 }
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44 #endif