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annotate libtommath/bn_mp_rshd.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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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_RSHD_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 right a certain amount of digits */
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7 void mp_rshd(mp_int *a, int b)
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8 {
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9 int x;
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10 mp_digit *bottom, *top;
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11
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12 /* if b <= 0 then ignore it */
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13 if (b <= 0) {
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14 return;
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15 }
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16
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17 /* if b > used then simply zero it and return */
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18 if (a->used <= b) {
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19 mp_zero(a);
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20 return;
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21 }
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23 /* shift the digits down */
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24
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25 /* bottom */
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26 bottom = a->dp;
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28 /* top [offset into digits] */
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29 top = a->dp + b;
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31 /* this is implemented as a sliding window where
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32 * the window is b-digits long and digits from
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33 * the top of the window are copied to the bottom
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34 *
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35 * e.g.
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37 b-2 | b-1 | b0 | b1 | b2 | ... | bb | ---->
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38 /\ | ---->
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39 \-------------------/ ---->
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40 */
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41 for (x = 0; x < (a->used - b); x++) {
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42 *bottom++ = *top++;
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43 }
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44
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45 /* zero the top digits */
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46 MP_ZERO_DIGITS(bottom, a->used - x);
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47
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48 /* remove excess digits */
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49 a->used -= b;
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50 }
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51 #endif