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annotate libtommath/bn_mp_mul_2.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 1051e4eea25a
children
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_MUL_2_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 /* b = a*2 */
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7 mp_err mp_mul_2(const mp_int *a, mp_int *b)
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8 {
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9 int x, oldused;
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10 mp_err err;
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11
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12 /* grow to accomodate result */
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13 if (b->alloc < (a->used + 1)) {
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14 if ((err = mp_grow(b, a->used + 1)) != MP_OKAY) {
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15 return err;
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16 }
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17 }
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19 oldused = b->used;
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20 b->used = a->used;
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22 {
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23 mp_digit r, rr, *tmpa, *tmpb;
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25 /* alias for source */
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26 tmpa = a->dp;
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27
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28 /* alias for dest */
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29 tmpb = b->dp;
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31 /* carry */
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32 r = 0;
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33 for (x = 0; x < a->used; x++) {
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34
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35 /* get what will be the *next* carry bit from the
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36 * MSB of the current digit
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37 */
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38 rr = *tmpa >> (mp_digit)(MP_DIGIT_BIT - 1);
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39
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40 /* now shift up this digit, add in the carry [from the previous] */
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41 *tmpb++ = ((*tmpa++ << 1uL) | r) & MP_MASK;
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43 /* copy the carry that would be from the source
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44 * digit into the next iteration
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45 */
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46 r = rr;
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47 }
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49 /* new leading digit? */
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50 if (r != 0u) {
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51 /* add a MSB which is always 1 at this point */
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52 *tmpb = 1;
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53 ++(b->used);
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54 }
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55
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56 /* now zero any excess digits on the destination
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57 * that we didn't write to
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58 */
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59 MP_ZERO_DIGITS(b->dp + b->used, oldused - b->used);
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60 }
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61 b->sign = a->sign;
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62 return MP_OKAY;
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63 }
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64 #endif