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annotate libtommath/bn_s_mp_add.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_S_MP_ADD_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 /* low level addition, based on HAC pp.594, Algorithm 14.7 */
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7 mp_err s_mp_add(const mp_int *a, const mp_int *b, mp_int *c)
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8 {
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9 const mp_int *x;
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10 mp_err err;
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11 int olduse, min, max;
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13 /* find sizes, we let |a| <= |b| which means we have to sort
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14 * them. "x" will point to the input with the most digits
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15 */
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16 if (a->used > b->used) {
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17 min = b->used;
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18 max = a->used;
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19 x = a;
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20 } else {
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21 min = a->used;
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22 max = b->used;
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23 x = b;
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24 }
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26 /* init result */
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27 if (c->alloc < (max + 1)) {
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28 if ((err = mp_grow(c, max + 1)) != MP_OKAY) {
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29 return err;
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30 }
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31 }
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33 /* get old used digit count and set new one */
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34 olduse = c->used;
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35 c->used = max + 1;
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37 {
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38 mp_digit u, *tmpa, *tmpb, *tmpc;
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39 int i;
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41 /* alias for digit pointers */
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42
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43 /* first input */
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44 tmpa = a->dp;
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45
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46 /* second input */
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47 tmpb = b->dp;
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49 /* destination */
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50 tmpc = c->dp;
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51
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52 /* zero the carry */
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53 u = 0;
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54 for (i = 0; i < min; i++) {
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55 /* Compute the sum at one digit, T[i] = A[i] + B[i] + U */
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56 *tmpc = *tmpa++ + *tmpb++ + u;
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57
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58 /* U = carry bit of T[i] */
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59 u = *tmpc >> (mp_digit)MP_DIGIT_BIT;
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60
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61 /* take away carry bit from T[i] */
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62 *tmpc++ &= MP_MASK;
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63 }
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64
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65 /* now copy higher words if any, that is in A+B
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66 * if A or B has more digits add those in
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67 */
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68 if (min != max) {
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69 for (; i < max; i++) {
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70 /* T[i] = X[i] + U */
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71 *tmpc = x->dp[i] + u;
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73 /* U = carry bit of T[i] */
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74 u = *tmpc >> (mp_digit)MP_DIGIT_BIT;
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75
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76 /* take away carry bit from T[i] */
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77 *tmpc++ &= MP_MASK;
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78 }
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79 }
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80
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81 /* add carry */
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82 *tmpc++ = u;
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83
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84 /* clear digits above oldused */
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85 MP_ZERO_DIGITS(tmpc, olduse - c->used);
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86 }
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87
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88 mp_clamp(c);
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89 return MP_OKAY;
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90 }
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91 #endif