Mercurial > dropbear

annotate libtommath/bn_mp_read_radix.c @ 1629:258b57b208ae

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Fix for issue successfull login of disabled user (#78) This commit introduces fix for scenario: 1. Root login disabled on dropbear 2. PAM authentication model enabled While login as root user, after prompt for password user is being notified about login failrue, but after second attempt of prompt for password within same session, login becames succesfull. Signed-off-by: Pawel Rapkiewicz <[email protected]>
author vincentto13 <33652988+vincentto13@users.noreply.github.com>
date Wed, 20 Mar 2019 15:03:40 +0100
parents 8bba51a55704
children f52919ffd3b1
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 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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15 * Tom St Denis, [email protected], http://libtom.org
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16 */
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17
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18 /* read a string [ASCII] in a given radix */
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19 int mp_read_radix (mp_int * a, const char *str, int radix)
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20 {
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21 int y, res, neg;
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22 char ch;
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23
389
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24 /* zero the digit bignum */
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25 mp_zero(a);
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26
284
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27 /* make sure the radix is ok */
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28 if ((radix < 2) || (radix > 64)) {
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29 return MP_VAL;
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30 }
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31
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32 /* if the leading digit is a
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33 * minus set the sign to negative.
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34 */
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35 if (*str == '-') {
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36 ++str;
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37 neg = MP_NEG;
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38 } else {
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39 neg = MP_ZPOS;
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40 }
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41
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42 /* set the integer to the default of zero */
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43 mp_zero (a);
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44
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45 /* process each digit of the string */
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46 while (*str != '\0') {
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47 /* if the radix <= 36 the conversion is case insensitive
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48 * this allows numbers like 1AB and 1ab to represent the same value
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49 * [e.g. in hex]
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50 */
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51 ch = (radix <= 36) ? (char)toupper((int)*str) : *str;
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52 for (y = 0; y < 64; y++) {
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53 if (ch == mp_s_rmap[y]) {
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54 break;
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55 }
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56 }
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57
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58 /* if the char was found in the map
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59 * and is less than the given radix add it
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60 * to the number, otherwise exit the loop.
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61 */
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62 if (y < radix) {
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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 } else {
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70 break;
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71 }
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72 ++str;
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73 }
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74
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75 /* set the sign only if a != 0 */
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76 if (mp_iszero(a) != MP_YES) {
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77 a->sign = neg;
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78 }
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79 return MP_OKAY;
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80 }
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81 #endif
389
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82
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83 /* ref: $Format:%D$ */
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84 /* git commit: $Format:%H$ */
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85 /* commit time: $Format:%ai$ */