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annotate libtommath/bn_mp_sub_d.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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1 #include "tommath_private.h"
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2 #ifdef BN_MP_SUB_D_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 /* single digit subtraction */
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7 mp_err mp_sub_d(const mp_int *a, mp_digit b, mp_int *c)
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8 {
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9 mp_digit *tmpa, *tmpc;
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10 mp_err err;
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11 int ix, oldused;
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13 /* grow c as required */
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14 if (c->alloc < (a->used + 1)) {
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15 if ((err = mp_grow(c, a->used + 1)) != MP_OKAY) {
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16 return err;
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17 }
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18 }
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20 /* if a is negative just do an unsigned
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21 * addition [with fudged signs]
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22 */
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23 if (a->sign == MP_NEG) {
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24 mp_int a_ = *a;
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25 a_.sign = MP_ZPOS;
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26 err = mp_add_d(&a_, b, c);
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27 c->sign = MP_NEG;
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28
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29 /* clamp */
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30 mp_clamp(c);
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31
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32 return err;
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33 }
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34
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35 /* setup regs */
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36 oldused = c->used;
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37 tmpa = a->dp;
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38 tmpc = c->dp;
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40 /* if a <= b simply fix the single digit */
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41 if (((a->used == 1) && (a->dp[0] <= b)) || (a->used == 0)) {
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42 if (a->used == 1) {
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43 *tmpc++ = b - *tmpa;
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44 } else {
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45 *tmpc++ = b;
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46 }
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47 ix = 1;
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49 /* negative/1digit */
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50 c->sign = MP_NEG;
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51 c->used = 1;
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52 } else {
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53 mp_digit mu = b;
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54
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55 /* positive/size */
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56 c->sign = MP_ZPOS;
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57 c->used = a->used;
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58
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59 /* subtract digits, mu is carry */
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60 for (ix = 0; ix < a->used; ix++) {
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61 *tmpc = *tmpa++ - mu;
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62 mu = *tmpc >> (MP_SIZEOF_BITS(mp_digit) - 1u);
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63 *tmpc++ &= MP_MASK;
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64 }
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65 }
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67 /* zero excess digits */
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68 MP_ZERO_DIGITS(tmpc, oldused - ix);
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69
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70 mp_clamp(c);
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71 return MP_OKAY;
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72 }
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74 #endif