Mercurial > dropbear

annotate libtommath/bn_mp_toradix_n.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +0800
parents 5ff8218bcee9
children 60fc6476e044
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #include <tommath.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://math.libtomcrypt.com
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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) {
284
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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) == 0) {
389
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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
284
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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
389
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85
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86 /* $Source: /cvs/libtom/libtommath/bn_mp_toradix_n.c,v $ */
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87 /* $Revision: 1.4 $ */
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88 /* $Date: 2006/03/31 14:18:44 $ */