Mercurial > dropbear

annotate libtommath/bn_mp_prime_is_prime.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_PRIME_IS_PRIME_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 *
389
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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 /* performs a variable number of rounds of Miller-Rabin
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19 *
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20 * Probability of error after t rounds is no more than
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21
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22 *
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23 * Sets result to 1 if probably prime, 0 otherwise
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24 */
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25 int mp_prime_is_prime (mp_int * a, int t, int *result)
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26 {
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27 mp_int b;
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28 int ix, err, res;
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29
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30 /* default to no */
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31 *result = MP_NO;
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32
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33 /* valid value of t? */
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34 if (t <= 0 || t > PRIME_SIZE) {
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35 return MP_VAL;
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36 }
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37
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38 /* is the input equal to one of the primes in the table? */
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39 for (ix = 0; ix < PRIME_SIZE; ix++) {
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40 if (mp_cmp_d(a, ltm_prime_tab[ix]) == MP_EQ) {
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41 *result = 1;
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42 return MP_OKAY;
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43 }
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44 }
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45
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46 /* first perform trial division */
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47 if ((err = mp_prime_is_divisible (a, &res)) != MP_OKAY) {
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48 return err;
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49 }
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50
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51 /* return if it was trivially divisible */
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52 if (res == MP_YES) {
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53 return MP_OKAY;
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54 }
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55
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56 /* now perform the miller-rabin rounds */
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57 if ((err = mp_init (&b)) != MP_OKAY) {
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58 return err;
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59 }
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60
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61 for (ix = 0; ix < t; ix++) {
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62 /* set the prime */
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63 mp_set (&b, ltm_prime_tab[ix]);
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64
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65 if ((err = mp_prime_miller_rabin (a, &b, &res)) != MP_OKAY) {
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66 goto LBL_B;
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67 }
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68
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69 if (res == MP_NO) {
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70 goto LBL_B;
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71 }
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72 }
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73
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74 /* passed the test */
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75 *result = MP_YES;
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76 LBL_B:mp_clear (&b);
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77 return err;
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78 }
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79 #endif
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80
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81 /* $Source: /cvs/libtom/libtommath/bn_mp_prime_is_prime.c,v $ */
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82 /* $Revision: 1.3 $ */
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83 /* $Date: 2006/03/31 14:18:44 $ */