Mercurial > dropbear

annotate libtommath/bn_mp_read_radix.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_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