Mercurial > dropbear

annotate libtommath/bn_mp_toradix_n.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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60fc6476e044 Update to libtommath v1.0
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1 #include <tommath_private.h>
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2 #ifdef BN_MP_TORADIX_N_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 /* stores a bignum as a ASCII string in a given radix (2..64)
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19 *
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20 * Stores upto maxlen-1 chars and always a NULL byte
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21 */
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22 int mp_toradix_n(mp_int * a, char *str, int radix, int maxlen)
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23 {
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24 int res, digs;
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25 mp_int t;
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26 mp_digit d;
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27 char *_s = str;
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28
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29 /* check range of the maxlen, radix */
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30 if ((maxlen < 2) || (radix < 2) || (radix > 64)) {
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31 return MP_VAL;
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32 }
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33
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34 /* quick out if its zero */
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35 if (mp_iszero(a) == MP_YES) {
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36 *str++ = '0';
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37 *str = '\0';
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38 return MP_OKAY;
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39 }
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40
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41 if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
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42 return res;
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43 }
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44
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45 /* if it is negative output a - */
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46 if (t.sign == MP_NEG) {
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47 /* we have to reverse our digits later... but not the - sign!! */
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48 ++_s;
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49
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50 /* store the flag and mark the number as positive */
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51 *str++ = '-';
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52 t.sign = MP_ZPOS;
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53
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54 /* subtract a char */
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55 --maxlen;
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56 }
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57
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58 digs = 0;
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59 while (mp_iszero (&t) == MP_NO) {
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60 if (--maxlen < 1) {
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61 /* no more room */
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62 break;
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63 }
284
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64 if ((res = mp_div_d (&t, (mp_digit) radix, &t, &d)) != MP_OKAY) {
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65 mp_clear (&t);
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66 return res;
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67 }
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68 *str++ = mp_s_rmap[d];
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69 ++digs;
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70 }
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71
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72 /* reverse the digits of the string. In this case _s points
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73 * to the first digit [exluding the sign] of the number
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74 */
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75 bn_reverse ((unsigned char *)_s, digs);
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76
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77 /* append a NULL so the string is properly terminated */
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78 *str = '\0';
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79
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80 mp_clear (&t);
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81 return MP_OKAY;
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82 }
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83
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84 #endif
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85
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86 /* ref: $Format:%D$ */
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87 /* git commit: $Format:%H$ */
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88 /* commit time: $Format:%ai$ */