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annotate libtommath/bn_mp_toradix_n.c @ 1671:5c8913b7464c

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Mention Ed25519 in dropbearkey man (#94)
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 18:28:27 +0500
parents f52919ffd3b1
children
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_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 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* stores a bignum as a ASCII string in a given radix (2..64)
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16 *
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17 * Stores upto maxlen-1 chars and always a NULL byte
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18 */
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19 int mp_toradix_n(const mp_int *a, char *str, int radix, int maxlen)
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20 {
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21 int res, digs;
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22 mp_int t;
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23 mp_digit d;
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24 char *_s = str;
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25
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26 /* check range of the maxlen, radix */
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27 if ((maxlen < 2) || (radix < 2) || (radix > 64)) {
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28 return MP_VAL;
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29 }
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30
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31 /* quick out if its zero */
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32 if (mp_iszero(a) == MP_YES) {
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33 *str++ = '0';
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34 *str = '\0';
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35 return MP_OKAY;
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36 }
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37
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38 if ((res = mp_init_copy(&t, a)) != MP_OKAY) {
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39 return res;
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40 }
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41
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42 /* if it is negative output a - */
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43 if (t.sign == MP_NEG) {
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44 /* we have to reverse our digits later... but not the - sign!! */
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45 ++_s;
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46
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47 /* store the flag and mark the number as positive */
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48 *str++ = '-';
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49 t.sign = MP_ZPOS;
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50
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51 /* subtract a char */
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52 --maxlen;
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53 }
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54
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55 digs = 0;
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56 while (mp_iszero(&t) == MP_NO) {
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57 if (--maxlen < 1) {
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58 /* no more room */
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59 break;
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60 }
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61 if ((res = mp_div_d(&t, (mp_digit)radix, &t, &d)) != MP_OKAY) {
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62 mp_clear(&t);
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63 return res;
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64 }
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65 *str++ = mp_s_rmap[d];
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66 ++digs;
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67 }
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68
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69 /* reverse the digits of the string. In this case _s points
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70 * to the first digit [exluding the sign] of the number
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71 */
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72 bn_reverse((unsigned char *)_s, digs);
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73
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74 /* append a NULL so the string is properly terminated */
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75 *str = '\0';
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76
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77 mp_clear(&t);
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78 return MP_OKAY;
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79 }
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81 #endif
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82
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83 /* ref: HEAD -> master, tag: v1.1.0 */
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84 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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85 /* commit time: 2019-01-28 20:32:32 +0100 */