Mercurial > dropbear

annotate libtommath/bn_mp_lcm.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents 1051e4eea25a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
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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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20 }
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21
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parents: 1470
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22 /* divide the smallest by the GCD */
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23 if (mp_cmp_mag(a, b) == MP_LT) {
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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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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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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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36
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parents: 1470
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37 /* fix the sign to positive */
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38 c->sign = MP_ZPOS;
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40 LBL_T:
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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