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annotate libtommath/bn_mp_pack.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:
rev   line source
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_PACK_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 /* based on gmp's mpz_export.
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7 * see http://gmplib.org/manual/Integer-Import-and-Export.html
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8 */
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9 mp_err mp_pack(void *rop, size_t maxcount, size_t *written, mp_order order, size_t size,
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10 mp_endian endian, size_t nails, const mp_int *op)
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11 {
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12 mp_err err;
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13 size_t odd_nails, nail_bytes, i, j, count;
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14 unsigned char odd_nail_mask;
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15
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16 mp_int t;
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17
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18 count = mp_pack_count(op, nails, size);
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19
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20 if (count > maxcount) {
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21 return MP_BUF;
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22 }
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23
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24 if ((err = mp_init_copy(&t, op)) != MP_OKAY) {
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25 return err;
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26 }
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27
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28 if (endian == MP_NATIVE_ENDIAN) {
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29 MP_GET_ENDIANNESS(endian);
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30 }
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31
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32 odd_nails = (nails % 8u);
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33 odd_nail_mask = 0xff;
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34 for (i = 0u; i < odd_nails; ++i) {
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35 odd_nail_mask ^= (unsigned char)(1u << (7u - i));
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36 }
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37 nail_bytes = nails / 8u;
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38
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39 for (i = 0u; i < count; ++i) {
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40 for (j = 0u; j < size; ++j) {
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41 unsigned char *byte = (unsigned char *)rop +
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42 (((order == MP_LSB_FIRST) ? i : ((count - 1u) - i)) * size) +
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43 ((endian == MP_LITTLE_ENDIAN) ? j : ((size - 1u) - j));
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44
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45 if (j >= (size - nail_bytes)) {
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46 *byte = 0;
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47 continue;
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48 }
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49
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50 *byte = (unsigned char)((j == ((size - nail_bytes) - 1u)) ? (t.dp[0] & odd_nail_mask) : (t.dp[0] & 0xFFuL));
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51
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52 if ((err = mp_div_2d(&t, (j == ((size - nail_bytes) - 1u)) ? (int)(8u - odd_nails) : 8, &t, NULL)) != MP_OKAY) {
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53 goto LBL_ERR;
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54 }
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55
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56 }
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57 }
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58
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59 if (written != NULL) {
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60 *written = count;
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61 }
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62 err = MP_OKAY;
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63
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64 LBL_ERR:
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65 mp_clear(&t);
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66 return err;
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67 }
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68
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69 #endif