Mercurial > dropbear

annotate libtommath/bn_mp_mul_2d.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +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
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_MUL_2D_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 /* shift left by a certain bit count */
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7 mp_err mp_mul_2d(const mp_int *a, int b, mp_int *c)
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8 {
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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9 mp_digit d;
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10 mp_err err;
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11
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12 /* copy */
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13 if (a != c) {
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14 if ((err = mp_copy(a, c)) != MP_OKAY) {
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15 return err;
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16 }
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17 }
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18
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19 if (c->alloc < (c->used + (b / MP_DIGIT_BIT) + 1)) {
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20 if ((err = mp_grow(c, c->used + (b / MP_DIGIT_BIT) + 1)) != MP_OKAY) {
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21 return err;
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22 }
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23 }
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24
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25 /* shift by as many digits in the bit count */
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26 if (b >= MP_DIGIT_BIT) {
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27 if ((err = mp_lshd(c, b / MP_DIGIT_BIT)) != MP_OKAY) {
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28 return err;
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29 }
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30 }
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31
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32 /* shift any bit count < MP_DIGIT_BIT */
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33 d = (mp_digit)(b % MP_DIGIT_BIT);
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34 if (d != 0u) {
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35 mp_digit *tmpc, shift, mask, r, rr;
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36 int x;
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38 /* bitmask for carries */
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39 mask = ((mp_digit)1 << d) - (mp_digit)1;
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41 /* shift for msbs */
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42 shift = (mp_digit)MP_DIGIT_BIT - d;
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44 /* alias */
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45 tmpc = c->dp;
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47 /* carry */
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48 r = 0;
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49 for (x = 0; x < c->used; x++) {
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50 /* get the higher bits of the current word */
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51 rr = (*tmpc >> shift) & mask;
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53 /* shift the current word and OR in the carry */
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54 *tmpc = ((*tmpc << d) | r) & MP_MASK;
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55 ++tmpc;
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56
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57 /* set the carry to the carry bits of the current word */
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58 r = rr;
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59 }
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61 /* set final carry */
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62 if (r != 0u) {
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63 c->dp[(c->used)++] = r;
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64 }
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65 }
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66 mp_clamp(c);
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67 return MP_OKAY;
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68 }
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69 #endif