Mercurial > dropbear

annotate libtommath/etc/2kprime.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
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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diff changeset
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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diff changeset
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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diff changeset
14 mp_digit z;
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15
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diff changeset
16 mp_init_multi(&q, &p, NULL);
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17
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diff changeset
18 out = fopen("2kprime.1", "w");
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diff changeset
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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diff changeset
21 mp_2expt(&q, sizes[x]);
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Matt Johnston <matt@ucc.asn.au>
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22 mp_add_d(&q, 3, &q);
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Matt Johnston <matt@ucc.asn.au>
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23 z = -3;
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24
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diff changeset
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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diff changeset
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
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
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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>
parents:
diff changeset
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)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
71 fprintf(out, "%d-bits (k = %lu) = %s\n", sizes[x], z, buf); fflush(out);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
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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Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
82 /* $Source: /cvs/libtom/libtommath/etc/2kprime.c,v $ */
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Matt Johnston <matt@ucc.asn.au>
parents: 284
diff changeset
83 /* $Revision: 1.2 $ */
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parents: 284
diff changeset
84 /* $Date: 2005/05/05 14:38:47 $ */