Mercurial > dropbear

annotate libtommath/bn_mp_sqrt.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)
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parents: 1470
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_SQRT_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 /* this function is less generic than mp_n_root, simpler and faster */
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7 mp_err mp_sqrt(const mp_int *arg, mp_int *ret)
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8 {
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9 mp_err err;
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10 mp_int t1, t2;
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11
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12 /* must be positive */
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13 if (arg->sign == MP_NEG) {
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14 return MP_VAL;
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15 }
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16
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17 /* easy out */
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18 if (MP_IS_ZERO(arg)) {
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19 mp_zero(ret);
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20 return MP_OKAY;
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21 }
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22
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23 if ((err = mp_init_copy(&t1, arg)) != MP_OKAY) {
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24 return err;
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25 }
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26
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27 if ((err = mp_init(&t2)) != MP_OKAY) {
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28 goto E2;
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29 }
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30
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31 /* First approx. (not very bad for large arg) */
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32 mp_rshd(&t1, t1.used/2);
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33
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34 /* t1 > 0 */
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35 if ((err = mp_div(arg, &t1, &t2, NULL)) != MP_OKAY) {
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36 goto E1;
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37 }
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38 if ((err = mp_add(&t1, &t2, &t1)) != MP_OKAY) {
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39 goto E1;
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40 }
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41 if ((err = mp_div_2(&t1, &t1)) != MP_OKAY) {
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42 goto E1;
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43 }
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44 /* And now t1 > sqrt(arg) */
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45 do {
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46 if ((err = mp_div(arg, &t1, &t2, NULL)) != MP_OKAY) {
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47 goto E1;
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48 }
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49 if ((err = mp_add(&t1, &t2, &t1)) != MP_OKAY) {
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50 goto E1;
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51 }
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52 if ((err = mp_div_2(&t1, &t1)) != MP_OKAY) {
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53 goto E1;
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54 }
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55 /* t1 >= sqrt(arg) >= t2 at this point */
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56 } while (mp_cmp_mag(&t1, &t2) == MP_GT);
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57
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58 mp_exch(&t1, ret);
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59
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60 E1:
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61 mp_clear(&t2);
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62 E2:
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63 mp_clear(&t1);
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64 return err;
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65 }
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67 #endif