Mercurial > dropbear

annotate libtommath/bn_mp_reduce_2k_l.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_REDUCE_2K_L_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 /* reduces a modulo n where n is of the form 2**p - d
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7 This differs from reduce_2k since "d" can be larger
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8 than a single digit.
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9 */
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10 mp_err mp_reduce_2k_l(mp_int *a, const mp_int *n, const mp_int *d)
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11 {
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12 mp_int q;
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13 mp_err err;
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14 int p;
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15
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16 if ((err = mp_init(&q)) != MP_OKAY) {
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17 return err;
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18 }
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19
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20 p = mp_count_bits(n);
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21 top:
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22 /* q = a/2**p, a = a mod 2**p */
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23 if ((err = mp_div_2d(a, p, &q, a)) != MP_OKAY) {
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24 goto LBL_ERR;
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25 }
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26
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27 /* q = q * d */
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28 if ((err = mp_mul(&q, d, &q)) != MP_OKAY) {
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29 goto LBL_ERR;
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30 }
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31
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32 /* a = a + q */
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33 if ((err = s_mp_add(a, &q, a)) != MP_OKAY) {
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34 goto LBL_ERR;
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35 }
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36
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37 if (mp_cmp_mag(a, n) != MP_LT) {
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38 if ((err = s_mp_sub(a, n, a)) != MP_OKAY) {
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39 goto LBL_ERR;
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40 }
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41 goto top;
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42 }
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43
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44 LBL_ERR:
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45 mp_clear(&q);
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46 return err;
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47 }
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49 #endif