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annotate libtommath/bn_mp_xor.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_XOR_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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5
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6 /* two complement xor */
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7 mp_err mp_xor(const mp_int *a, const mp_int *b, mp_int *c)
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8 {
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9 int used = MP_MAX(a->used, b->used) + 1, i;
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10 mp_err err;
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11 mp_digit ac = 1, bc = 1, cc = 1;
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12 mp_sign csign = (a->sign != b->sign) ? MP_NEG : MP_ZPOS;
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13
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14 if (c->alloc < used) {
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15 if ((err = mp_grow(c, used)) != MP_OKAY) {
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16 return err;
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17 }
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18 }
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19
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20 for (i = 0; i < used; i++) {
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21 mp_digit x, y;
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22
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23 /* convert to two complement if negative */
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24 if (a->sign == MP_NEG) {
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25 ac += (i >= a->used) ? MP_MASK : (~a->dp[i] & MP_MASK);
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26 x = ac & MP_MASK;
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27 ac >>= MP_DIGIT_BIT;
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28 } else {
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29 x = (i >= a->used) ? 0uL : a->dp[i];
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30 }
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31
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32 /* convert to two complement if negative */
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33 if (b->sign == MP_NEG) {
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34 bc += (i >= b->used) ? MP_MASK : (~b->dp[i] & MP_MASK);
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35 y = bc & MP_MASK;
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36 bc >>= MP_DIGIT_BIT;
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37 } else {
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38 y = (i >= b->used) ? 0uL : b->dp[i];
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39 }
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40
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41 c->dp[i] = x ^ y;
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42
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43 /* convert to to sign-magnitude if negative */
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44 if (csign == MP_NEG) {
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45 cc += ~c->dp[i] & MP_MASK;
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46 c->dp[i] = cc & MP_MASK;
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47 cc >>= MP_DIGIT_BIT;
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48 }
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49 }
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50
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51 c->used = used;
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52 c->sign = csign;
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53 mp_clamp(c);
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54 return MP_OKAY;
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55 }
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56 #endif