Mercurial > dropbear

annotate libtommath/bn_mp_cnt_lsb.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)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_CNT_LSB_C
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1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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4 /* SPDX-License-Identifier: Unlicense */
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5
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parents: 1470
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6 static const int lnz[16] = {
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7 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0
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8 };
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9
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10 /* Counts the number of lsbs which are zero before the first zero bit */
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents: 1470
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11 int mp_cnt_lsb(const mp_int *a)
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12 {
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13 int x;
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14 mp_digit q, qq;
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16 /* easy out */
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17 if (MP_IS_ZERO(a)) {
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18 return 0;
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19 }
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21 /* scan lower digits until non-zero */
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parents: 1470
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22 for (x = 0; (x < a->used) && (a->dp[x] == 0u); x++) {}
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23 q = a->dp[x];
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24 x *= MP_DIGIT_BIT;
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26 /* now scan this digit until a 1 is found */
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parents: 1470
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27 if ((q & 1u) == 0u) {
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28 do {
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29 qq = q & 15u;
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30 x += lnz[qq];
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31 q >>= 4;
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parents: 1470
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32 } while (qq == 0u);
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33 }
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34 return x;
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35 }
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37 #endif