Mercurial > dropbear

annotate libtommath/bn_mp_radix_size.c @ 1674:ba6fc7afe1c5

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author Matt Johnston <matt@ucc.asn.au>
date Mon, 06 Apr 2020 23:18:26 +0800
parents f52919ffd3b1
children 1051e4eea25a
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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 *
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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 /* returns size of ASCII reprensentation */
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16 int mp_radix_size(const mp_int *a, int radix, int *size)
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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
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22 *size = 0;
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23
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24 /* make sure the radix is in range */
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25 if ((radix < 2) || (radix > 64)) {
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26 return MP_VAL;
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27 }
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28
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29 if (mp_iszero(a) == MP_YES) {
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30 *size = 2;
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31 return MP_OKAY;
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32 }
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33
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34 /* special case for binary */
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35 if (radix == 2) {
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36 *size = mp_count_bits(a) + ((a->sign == MP_NEG) ? 1 : 0) + 1;
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37 return MP_OKAY;
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38 }
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39
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40 /* digs is the digit count */
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41 digs = 0;
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42
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43 /* if it's negative add one for the sign */
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44 if (a->sign == MP_NEG) {
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45 ++digs;
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46 }
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47
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48 /* init a copy of the input */
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49 if ((res = mp_init_copy(&t, a)) != MP_OKAY) {
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50 return res;
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51 }
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52
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53 /* force temp to positive */
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54 t.sign = MP_ZPOS;
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55
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56 /* fetch out all of the digits */
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57 while (mp_iszero(&t) == MP_NO) {
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58 if ((res = mp_div_d(&t, (mp_digit)radix, &t, &d)) != MP_OKAY) {
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59 mp_clear(&t);
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60 return res;
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61 }
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62 ++digs;
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63 }
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64 mp_clear(&t);
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65
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66 /* return digs + 1, the 1 is for the NULL byte that would be required. */
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67 *size = digs + 1;
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68 return MP_OKAY;
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69 }
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70
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71 #endif
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73 /* ref: HEAD -> master, tag: v1.1.0 */
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74 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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75 /* commit time: 2019-01-28 20:32:32 +0100 */