Mercurial > dropbear

annotate libtommath/bn_mp_to_radix.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +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)
Steffen Jaeckel <s@jaeckel.eu>
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_TO_RADIX_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 /* stores a bignum as a ASCII string in a given radix (2..64)
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7 *
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8 * Stores upto "size - 1" chars and always a NULL byte, puts the number of characters
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9 * written, including the '\0', in "written".
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10 */
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11 mp_err mp_to_radix(const mp_int *a, char *str, size_t maxlen, size_t *written, int radix)
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12 {
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13 size_t digs;
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14 mp_err err;
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15 mp_int t;
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16 mp_digit d;
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17 char *_s = str;
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18
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19 /* check range of radix and size*/
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20 if (maxlen < 2u) {
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21 return MP_BUF;
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22 }
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23 if ((radix < 2) || (radix > 64)) {
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24 return MP_VAL;
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25 }
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26
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27 /* quick out if its zero */
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28 if (MP_IS_ZERO(a)) {
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29 *str++ = '0';
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30 *str = '\0';
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31 if (written != NULL) {
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32 *written = 2u;
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33 }
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34 return MP_OKAY;
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35 }
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36
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37 if ((err = mp_init_copy(&t, a)) != MP_OKAY) {
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38 return err;
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39 }
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40
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41 /* if it is negative output a - */
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42 if (t.sign == MP_NEG) {
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43 /* we have to reverse our digits later... but not the - sign!! */
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44 ++_s;
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45
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46 /* store the flag and mark the number as positive */
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47 *str++ = '-';
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48 t.sign = MP_ZPOS;
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49
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50 /* subtract a char */
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51 --maxlen;
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52 }
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53 digs = 0u;
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54 while (!MP_IS_ZERO(&t)) {
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55 if (--maxlen < 1u) {
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56 /* no more room */
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57 err = MP_BUF;
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58 goto LBL_ERR;
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59 }
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60 if ((err = mp_div_d(&t, (mp_digit)radix, &t, &d)) != MP_OKAY) {
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61 goto LBL_ERR;
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62 }
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63 *str++ = mp_s_rmap[d];
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64 ++digs;
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65 }
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66 /* reverse the digits of the string. In this case _s points
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67 * to the first digit [exluding the sign] of the number
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68 */
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69 s_mp_reverse((unsigned char *)_s, digs);
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70
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71 /* append a NULL so the string is properly terminated */
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72 *str = '\0';
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73 digs++;
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74
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75 if (written != NULL) {
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76 *written = (a->sign == MP_NEG) ? (digs + 1u): digs;
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77 }
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78
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79 LBL_ERR:
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80 mp_clear(&t);
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81 return err;
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82 }
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83
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84 #endif