Mercurial > dropbear

annotate libtommath/bn_mp_read_radix.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:
rev   line source
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1 #include <tommath.h>
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2 #ifdef BN_MP_READ_RADIX_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
284
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16 */
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17
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18 /* read a string [ASCII] in a given radix */
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19 int mp_read_radix (mp_int * a, const char *str, int radix)
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20 {
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21 int y, res, neg;
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22 char ch;
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23
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24 /* zero the digit bignum */
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25 mp_zero(a);
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26
284
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27 /* make sure the radix is ok */
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28 if (radix < 2 || radix > 64) {
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29 return MP_VAL;
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30 }
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31
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32 /* if the leading digit is a
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33 * minus set the sign to negative.
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34 */
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35 if (*str == '-') {
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36 ++str;
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37 neg = MP_NEG;
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38 } else {
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39 neg = MP_ZPOS;
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40 }
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41
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42 /* set the integer to the default of zero */
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43 mp_zero (a);
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44
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45 /* process each digit of the string */
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46 while (*str) {
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47 /* if the radix < 36 the conversion is case insensitive
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48 * this allows numbers like 1AB and 1ab to represent the same value
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49 * [e.g. in hex]
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50 */
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51 ch = (char) ((radix < 36) ? toupper (*str) : *str);
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52 for (y = 0; y < 64; y++) {
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53 if (ch == mp_s_rmap[y]) {
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54 break;
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55 }
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56 }
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57
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58 /* if the char was found in the map
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59 * and is less than the given radix add it
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60 * to the number, otherwise exit the loop.
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61 */
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62 if (y < radix) {
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63 if ((res = mp_mul_d (a, (mp_digit) radix, a)) != MP_OKAY) {
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64 return res;
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65 }
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66 if ((res = mp_add_d (a, (mp_digit) y, a)) != MP_OKAY) {
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67 return res;
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68 }
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69 } else {
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70 break;
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71 }
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72 ++str;
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73 }
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74
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75 /* set the sign only if a != 0 */
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76 if (mp_iszero(a) != 1) {
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77 a->sign = neg;
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78 }
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79 return MP_OKAY;
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80 }
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81 #endif
389
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82
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83 /* $Source: /cvs/libtom/libtommath/bn_mp_read_radix.c,v $ */
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84 /* $Revision: 1.4 $ */
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85 /* $Date: 2006/03/31 14:18:44 $ */