Mercurial > dropbear

annotate libtommath/bn_mp_read_radix.c @ 1771:af9ed0815818

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Use SSH packet mutator for preauth too Get rid of separate client mutator. Have 0.1% chance of llvm random mutation Add comments
author Matt Johnston <matt@ucc.asn.au>
date Thu, 29 Oct 2020 22:41:37 +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