Mercurial > dropbear

annotate libtommath/bn_mp_radix_size.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +0800
parents 5ff8218bcee9
children 60fc6476e044
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include <tommath.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 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.com
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16 */
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17
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18 /* returns size of ASCII reprensentation */
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19 int mp_radix_size (mp_int * a, int radix, int *size)
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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
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25 *size = 0;
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26
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27 /* special case for binary */
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28 if (radix == 2) {
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29 *size = mp_count_bits (a) + (a->sign == MP_NEG ? 1 : 0) + 1;
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30 return MP_OKAY;
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31 }
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32
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33 /* make sure the radix is in range */
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34 if (radix < 2 || radix > 64) {
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35 return MP_VAL;
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36 }
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37
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38 if (mp_iszero(a) == MP_YES) {
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39 *size = 2;
284
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40 return MP_OKAY;
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41 }
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42
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43 /* digs is the digit count */
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44 digs = 0;
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45
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46 /* if it's negative add one for the sign */
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47 if (a->sign == MP_NEG) {
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48 ++digs;
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49 }
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50
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51 /* init a copy of the input */
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52 if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
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53 return res;
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54 }
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55
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56 /* force temp to positive */
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57 t.sign = MP_ZPOS;
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58
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59 /* fetch out all of the digits */
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60 while (mp_iszero (&t) == MP_NO) {
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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 ++digs;
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66 }
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67 mp_clear (&t);
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68
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69 /* return digs + 1, the 1 is for the NULL byte that would be required. */
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70 *size = digs + 1;
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71 return MP_OKAY;
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72 }
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73
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74 #endif
389
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75
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76 /* $Source: /cvs/libtom/libtommath/bn_mp_radix_size.c,v $ */
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77 /* $Revision: 1.4 $ */
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78 /* $Date: 2006/03/31 14:18:44 $ */