Mercurial > dropbear

annotate libtommath/bn_mp_read_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:
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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_READ_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 #define MP_TOUPPER(c) ((((c) >= 'a') && ((c) <= 'z')) ? (((c) + 'A') - 'a') : (c))
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8 /* read a string [ASCII] in a given radix */
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9 mp_err mp_read_radix(mp_int *a, const char *str, int radix)
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10 {
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11 mp_err err;
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12 int y;
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13 mp_sign neg;
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14 unsigned pos;
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15 char ch;
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16
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17 /* zero the digit bignum */
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18 mp_zero(a);
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19
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20 /* make sure the radix is ok */
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21 if ((radix < 2) || (radix > 64)) {
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22 return MP_VAL;
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23 }
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24
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25 /* if the leading digit is a
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26 * minus set the sign to negative.
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27 */
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28 if (*str == '-') {
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29 ++str;
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30 neg = MP_NEG;
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31 } else {
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32 neg = MP_ZPOS;
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33 }
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34
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35 /* set the integer to the default of zero */
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36 mp_zero(a);
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37
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38 /* process each digit of the string */
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39 while (*str != '\0') {
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40 /* if the radix <= 36 the conversion is case insensitive
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41 * this allows numbers like 1AB and 1ab to represent the same value
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42 * [e.g. in hex]
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43 */
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44 ch = (radix <= 36) ? (char)MP_TOUPPER((int)*str) : *str;
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45 pos = (unsigned)(ch - '(');
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46 if (mp_s_rmap_reverse_sz < pos) {
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47 break;
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48 }
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49 y = (int)mp_s_rmap_reverse[pos];
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50
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51 /* if the char was found in the map
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52 * and is less than the given radix add it
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53 * to the number, otherwise exit the loop.
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54 */
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55 if ((y == 0xff) || (y >= radix)) {
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56 break;
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57 }
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58 if ((err = mp_mul_d(a, (mp_digit)radix, a)) != MP_OKAY) {
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59 return err;
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60 }
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61 if ((err = mp_add_d(a, (mp_digit)y, a)) != MP_OKAY) {
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62 return err;
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63 }
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64 ++str;
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65 }
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66
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67 /* if an illegal character was found, fail. */
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68 if (!((*str == '\0') || (*str == '\r') || (*str == '\n'))) {
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69 mp_zero(a);
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70 return MP_VAL;
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71 }
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72
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73 /* set the sign only if a != 0 */
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74 if (!MP_IS_ZERO(a)) {
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75 a->sign = neg;
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76 }
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77 return MP_OKAY;
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78 }
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79 #endif