Mercurial > dropbear

annotate libtommath/bn_mp_prime_is_prime.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:
rev   line source
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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
389
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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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diff changeset
82 /* $Revision: 1.3 $ */
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83 /* $Date: 2006/03/31 14:18:44 $ */