Mercurial > dropbear

annotate libtommath/bn_mp_mod_2d.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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parents: 1470
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_MOD_2D_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 /* calc a value mod 2**b */
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7 mp_err mp_mod_2d(const mp_int *a, int b, mp_int *c)
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8 {
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9 int x;
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10 mp_err err;
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12 /* if b is <= 0 then zero the int */
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13 if (b <= 0) {
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14 mp_zero(c);
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15 return MP_OKAY;
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16 }
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18 /* if the modulus is larger than the value than return */
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19 if (b >= (a->used * MP_DIGIT_BIT)) {
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20 return mp_copy(a, c);
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21 }
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23 /* copy */
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24 if ((err = mp_copy(a, c)) != MP_OKAY) {
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25 return err;
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26 }
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28 /* zero digits above the last digit of the modulus */
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29 x = (b / MP_DIGIT_BIT) + (((b % MP_DIGIT_BIT) == 0) ? 0 : 1);
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30 MP_ZERO_DIGITS(c->dp + x, c->used - x);
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32 /* clear the digit that is not completely outside/inside the modulus */
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33 c->dp[b / MP_DIGIT_BIT] &=
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34 ((mp_digit)1 << (mp_digit)(b % MP_DIGIT_BIT)) - (mp_digit)1;
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35 mp_clamp(c);
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36 return MP_OKAY;
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37 }
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38 #endif