Mercurial > dropbear

annotate libtommath/etc/2kprime.c @ 712:bf0ac0512ef7

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Fix "-m none" case and ugly typo
author Matt Johnston <matt@ucc.asn.au>
date Wed, 20 Mar 2013 23:13:45 +0800
parents 5ff8218bcee9
children 60fc6476e044
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
284
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parents:
diff changeset
1 /* Makes safe primes of a 2k nature */
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diff changeset
2 #include <tommath.h>
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3 #include <time.h>
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4
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5 int sizes[] = {256, 512, 768, 1024, 1536, 2048, 3072, 4096};
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6
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7 int main(void)
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8 {
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9 char buf[2000];
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diff changeset
10 int x, y;
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diff changeset
11 mp_int q, p;
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diff changeset
12 FILE *out;
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diff changeset
13 clock_t t1;
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14 mp_digit z;
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15
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16 mp_init_multi(&q, &p, NULL);
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17
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18 out = fopen("2kprime.1", "w");
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19 for (x = 0; x < (int)(sizeof(sizes) / sizeof(sizes[0])); x++) {
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20 top:
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Matt Johnston <matt@ucc.asn.au>
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21 mp_2expt(&q, sizes[x]);
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22 mp_add_d(&q, 3, &q);
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23 z = -3;
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24
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25 t1 = clock();
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26 for(;;) {
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27 mp_sub_d(&q, 4, &q);
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28 z += 4;
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29
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30 if (z > MP_MASK) {
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31 printf("No primes of size %d found\n", sizes[x]);
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32 break;
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33 }
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34
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35 if (clock() - t1 > CLOCKS_PER_SEC) {
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36 printf("."); fflush(stdout);
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37 // sleep((clock() - t1 + CLOCKS_PER_SEC/2)/CLOCKS_PER_SEC);
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38 t1 = clock();
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39 }
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40
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41 /* quick test on q */
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42 mp_prime_is_prime(&q, 1, &y);
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43 if (y == 0) {
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44 continue;
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45 }
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46
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47 /* find (q-1)/2 */
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48 mp_sub_d(&q, 1, &p);
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49 mp_div_2(&p, &p);
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50 mp_prime_is_prime(&p, 3, &y);
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51 if (y == 0) {
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52 continue;
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53 }
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54
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55 /* test on q */
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56 mp_prime_is_prime(&q, 3, &y);
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57 if (y == 0) {
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58 continue;
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59 }
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60
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61 break;
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62 }
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63
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64 if (y == 0) {
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65 ++sizes[x];
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66 goto top;
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67 }
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68
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69 mp_toradix(&q, buf, 10);
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Matt Johnston <matt@ucc.asn.au>
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70 printf("\n\n%d-bits (k = %lu) = %s\n", sizes[x], z, buf);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
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71 fprintf(out, "%d-bits (k = %lu) = %s\n", sizes[x], z, buf); fflush(out);
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72 }
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73
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74 return 0;
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75 }
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80
389
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parents: 284
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81
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parents: 284
diff changeset
82 /* $Source: /cvs/libtom/libtommath/etc/2kprime.c,v $ */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
83 /* $Revision: 1.2 $ */
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diff changeset
84 /* $Date: 2005/05/05 14:38:47 $ */