Mercurial > dropbear

annotate libtommath/etc/drprime.c @ 1060:4c733310c21d nocircbuffer

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reword comment for clarity
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Mar 2015 23:26:42 +0800
parents 5ff8218bcee9
children 60fc6476e044
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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284
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 /* Makes safe primes of a DR nature */
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2 #include <tommath.h>
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3
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4 int sizes[] = { 1+256/DIGIT_BIT, 1+512/DIGIT_BIT, 1+768/DIGIT_BIT, 1+1024/DIGIT_BIT, 1+2048/DIGIT_BIT, 1+4096/DIGIT_BIT };
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5 int main(void)
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6 {
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diff changeset
7 int res, x, y;
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8 char buf[4096];
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9 FILE *out;
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10 mp_int a, b;
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11
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Matt Johnston <matt@ucc.asn.au>
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12 mp_init(&a);
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13 mp_init(&b);
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14
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Matt Johnston <matt@ucc.asn.au>
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15 out = fopen("drprimes.txt", "w");
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16 for (x = 0; x < (int)(sizeof(sizes)/sizeof(sizes[0])); x++) {
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Matt Johnston <matt@ucc.asn.au>
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17 top:
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Matt Johnston <matt@ucc.asn.au>
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18 printf("Seeking a %d-bit safe prime\n", sizes[x] * DIGIT_BIT);
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Matt Johnston <matt@ucc.asn.au>
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19 mp_grow(&a, sizes[x]);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
20 mp_zero(&a);
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Matt Johnston <matt@ucc.asn.au>
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21 for (y = 1; y < sizes[x]; y++) {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
22 a.dp[y] = MP_MASK;
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23 }
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24
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25 /* make a DR modulus */
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26 a.dp[0] = -1;
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
27 a.used = sizes[x];
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28
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29 /* now loop */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
30 res = 0;
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31 for (;;) {
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32 a.dp[0] += 4;
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Matt Johnston <matt@ucc.asn.au>
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33 if (a.dp[0] >= MP_MASK) break;
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34 mp_prime_is_prime(&a, 1, &res);
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35 if (res == 0) continue;
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36 printf("."); fflush(stdout);
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37 mp_sub_d(&a, 1, &b);
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Matt Johnston <matt@ucc.asn.au>
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38 mp_div_2(&b, &b);
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Matt Johnston <matt@ucc.asn.au>
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39 mp_prime_is_prime(&b, 3, &res);
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Matt Johnston <matt@ucc.asn.au>
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40 if (res == 0) continue;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
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41 mp_prime_is_prime(&a, 3, &res);
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42 if (res == 1) break;
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43 }
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44
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45 if (res != 1) {
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46 printf("Error not DR modulus\n"); sizes[x] += 1; goto top;
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47 } else {
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48 mp_toradix(&a, buf, 10);
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49 printf("\n\np == %s\n\n", buf);
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50 fprintf(out, "%d-bit prime:\np == %s\n\n", mp_count_bits(&a), buf); fflush(out);
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51 }
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52 }
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53 fclose(out);
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54
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55 mp_clear(&a);
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56 mp_clear(&b);
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57
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58 return 0;
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59 }
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60
389
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parents: 284
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61
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62 /* $Source: /cvs/libtom/libtommath/etc/drprime.c,v $ */
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63 /* $Revision: 1.2 $ */
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64 /* $Date: 2005/05/05 14:38:47 $ */