Mercurial > dropbear

annotate libtommath/bn_mp_toradix_n.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +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_TORADIX_N_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 /* stores a bignum as a ASCII string in a given radix (2..64)
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19 *
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20 * Stores upto maxlen-1 chars and always a NULL byte
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21 */
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22 int mp_toradix_n(mp_int * a, char *str, int radix, int maxlen)
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23 {
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24 int res, digs;
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25 mp_int t;
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26 mp_digit d;
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27 char *_s = str;
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28
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29 /* check range of the maxlen, radix */
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30 if (maxlen < 2 || radix < 2 || radix > 64) {
284
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31 return MP_VAL;
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32 }
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33
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34 /* quick out if its zero */
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35 if (mp_iszero(a) == MP_YES) {
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36 *str++ = '0';
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37 *str = '\0';
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38 return MP_OKAY;
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39 }
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40
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41 if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
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42 return res;
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43 }
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44
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45 /* if it is negative output a - */
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46 if (t.sign == MP_NEG) {
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47 /* we have to reverse our digits later... but not the - sign!! */
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48 ++_s;
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49
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50 /* store the flag and mark the number as positive */
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51 *str++ = '-';
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52 t.sign = MP_ZPOS;
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53
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54 /* subtract a char */
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55 --maxlen;
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56 }
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57
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58 digs = 0;
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59 while (mp_iszero (&t) == 0) {
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60 if (--maxlen < 1) {
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61 /* no more room */
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62 break;
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63 }
284
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64 if ((res = mp_div_d (&t, (mp_digit) radix, &t, &d)) != MP_OKAY) {
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65 mp_clear (&t);
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66 return res;
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67 }
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68 *str++ = mp_s_rmap[d];
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69 ++digs;
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70 }
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71
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72 /* reverse the digits of the string. In this case _s points
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73 * to the first digit [exluding the sign] of the number
284
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74 */
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75 bn_reverse ((unsigned char *)_s, digs);
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76
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77 /* append a NULL so the string is properly terminated */
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78 *str = '\0';
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79
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80 mp_clear (&t);
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81 return MP_OKAY;
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82 }
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83
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84 #endif
389
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85
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86 /* $Source: /cvs/libtom/libtommath/bn_mp_toradix_n.c,v $ */
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87 /* $Revision: 1.4 $ */
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88 /* $Date: 2006/03/31 14:18:44 $ */