Mercurial > dropbear

annotate libtommath/bn_mp_read_radix.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +0000
parents f52919ffd3b1
children 1051e4eea25a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* read a string [ASCII] in a given radix */
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16 int mp_read_radix(mp_int *a, const char *str, int radix)
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17 {
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18 int y, res, neg;
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19 unsigned pos;
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20 char ch;
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21
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22 /* zero the digit bignum */
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23 mp_zero(a);
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24
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25 /* make sure the radix is ok */
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26 if ((radix < 2) || (radix > 64)) {
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27 return MP_VAL;
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28 }
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29
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30 /* if the leading digit is a
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31 * minus set the sign to negative.
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32 */
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33 if (*str == '-') {
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34 ++str;
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35 neg = MP_NEG;
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36 } else {
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37 neg = MP_ZPOS;
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38 }
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39
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40 /* set the integer to the default of zero */
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41 mp_zero(a);
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42
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43 /* process each digit of the string */
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44 while (*str != '\0') {
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45 /* if the radix <= 36 the conversion is case insensitive
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46 * this allows numbers like 1AB and 1ab to represent the same value
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47 * [e.g. in hex]
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48 */
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49 ch = (radix <= 36) ? (char)toupper((int)*str) : *str;
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50 pos = (unsigned)(ch - '(');
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51 if (mp_s_rmap_reverse_sz < pos) {
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52 break;
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53 }
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54 y = (int)mp_s_rmap_reverse[pos];
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55
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56 /* if the char was found in the map
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57 * and is less than the given radix add it
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58 * to the number, otherwise exit the loop.
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59 */
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60 if ((y == 0xff) || (y >= radix)) {
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61 break;
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62 }
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63 if ((res = mp_mul_d(a, (mp_digit)radix, a)) != MP_OKAY) {
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64 return res;
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65 }
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66 if ((res = mp_add_d(a, (mp_digit)y, a)) != MP_OKAY) {
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67 return res;
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68 }
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69 ++str;
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70 }
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71
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72 /* if an illegal character was found, fail. */
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73 if (!((*str == '\0') || (*str == '\r') || (*str == '\n'))) {
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74 mp_zero(a);
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75 return MP_VAL;
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76 }
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77
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78 /* set the sign only if a != 0 */
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79 if (mp_iszero(a) != MP_YES) {
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80 a->sign = neg;
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81 }
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82 return MP_OKAY;
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83 }
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84 #endif
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85
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86 /* ref: HEAD -> master, tag: v1.1.0 */
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87 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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88 /* commit time: 2019-01-28 20:32:32 +0100 */