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annotate libtommath/bn_mp_expt_u32.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_EXPT_U32_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 /* calculate c = a**b using a square-multiply algorithm */
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7 mp_err mp_expt_u32(const mp_int *a, uint32_t b, mp_int *c)
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8 {
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9 mp_err err;
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10
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11 mp_int g;
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12
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13 if ((err = mp_init_copy(&g, a)) != MP_OKAY) {
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14 return err;
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15 }
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16
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17 /* set initial result */
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18 mp_set(c, 1uL);
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19
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20 while (b > 0u) {
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21 /* if the bit is set multiply */
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22 if ((b & 1u) != 0u) {
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23 if ((err = mp_mul(c, &g, c)) != 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
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28 /* square */
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29 if (b > 1u) {
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30 if ((err = mp_sqr(&g, &g)) != MP_OKAY) {
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31 goto LBL_ERR;
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32 }
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33 }
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34
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35 /* shift to next bit */
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36 b >>= 1;
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37 }
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38
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39 err = MP_OKAY;
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40
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41 LBL_ERR:
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42 mp_clear(&g);
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43 return err;
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44 }
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45
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46 #endif