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annotate libtommath/bn_mp_toradix.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
parents f52919ffd3b1
children
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_TORADIX_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 int mp_toradix(const mp_int *a, char *str, int radix)
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17 {
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18 int res, digs;
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19 mp_int t;
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20 mp_digit d;
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21 char *_s = str;
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22
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23 /* check range of the radix */
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24 if ((radix < 2) || (radix > 64)) {
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25 return MP_VAL;
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26 }
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28 /* quick out if its zero */
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29 if (mp_iszero(a) == MP_YES) {
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30 *str++ = '0';
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31 *str = '\0';
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32 return MP_OKAY;
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33 }
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34
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35 if ((res = mp_init_copy(&t, a)) != MP_OKAY) {
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36 return res;
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37 }
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39 /* if it is negative output a - */
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40 if (t.sign == MP_NEG) {
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41 ++_s;
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42 *str++ = '-';
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43 t.sign = MP_ZPOS;
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44 }
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46 digs = 0;
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47 while (mp_iszero(&t) == MP_NO) {
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48 if ((res = mp_div_d(&t, (mp_digit)radix, &t, &d)) != MP_OKAY) {
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49 mp_clear(&t);
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50 return res;
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51 }
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52 *str++ = mp_s_rmap[d];
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53 ++digs;
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54 }
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55
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56 /* reverse the digits of the string. In this case _s points
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57 * to the first digit [exluding the sign] of the number]
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58 */
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59 bn_reverse((unsigned char *)_s, digs);
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60
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61 /* append a NULL so the string is properly terminated */
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62 *str = '\0';
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63
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64 mp_clear(&t);
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65 return MP_OKAY;
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66 }
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68 #endif
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70 /* ref: HEAD -> master, tag: v1.1.0 */
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71 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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72 /* commit time: 2019-01-28 20:32:32 +0100 */