Mercurial > dropbear

annotate libtommath/bn_mp_radix_size.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +0000
parents f52919ffd3b1
children 1051e4eea25a
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 *
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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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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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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 */