Mercurial > dropbear

annotate libtommath/bn_mp_radix_size.c @ 1792:2bf1e97ba3cd

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Update INSTALL (#113) Make Git/Mercurial instructions easier to understand
author Xenhat <commits@xenh.at>
date Thu, 17 Dec 2020 04:35:48 -0500
parents 1051e4eea25a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_RADIX_SIZE_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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5
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6 /* returns size of ASCII representation */
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7 mp_err mp_radix_size(const mp_int *a, int radix, int *size)
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8 {
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9 mp_err err;
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10 int digs;
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11 mp_int t;
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12 mp_digit d;
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13
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14 *size = 0;
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15
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16 /* make sure the radix is in range */
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17 if ((radix < 2) || (radix > 64)) {
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18 return MP_VAL;
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19 }
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20
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21 if (MP_IS_ZERO(a)) {
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22 *size = 2;
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23 return MP_OKAY;
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24 }
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26 /* special case for binary */
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27 if (radix == 2) {
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28 *size = (mp_count_bits(a) + ((a->sign == MP_NEG) ? 1 : 0) + 1);
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29 return MP_OKAY;
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30 }
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31
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32 /* digs is the digit count */
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33 digs = 0;
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34
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35 /* if it's negative add one for the sign */
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36 if (a->sign == MP_NEG) {
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37 ++digs;
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38 }
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39
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40 /* init a copy of the input */
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41 if ((err = mp_init_copy(&t, a)) != MP_OKAY) {
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42 return err;
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43 }
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44
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45 /* force temp to positive */
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46 t.sign = MP_ZPOS;
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47
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48 /* fetch out all of the digits */
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49 while (!MP_IS_ZERO(&t)) {
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50 if ((err = mp_div_d(&t, (mp_digit)radix, &t, &d)) != MP_OKAY) {
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51 goto LBL_ERR;
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52 }
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53 ++digs;
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54 }
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55
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56 /* return digs + 1, the 1 is for the NULL byte that would be required. */
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57 *size = digs + 1;
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58 err = MP_OKAY;
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59
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60 LBL_ERR:
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61 mp_clear(&t);
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62 return err;
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63 }
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65 #endif