Mercurial > dropbear

annotate libtommath/etc/drprime.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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284
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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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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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12 mp_init(&a);
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13 mp_init(&b);
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14
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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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17 top:
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18 printf("Seeking a %d-bit safe prime\n", sizes[x] * DIGIT_BIT);
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19 mp_grow(&a, sizes[x]);
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20 mp_zero(&a);
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21 for (y = 1; y < sizes[x]; y++) {
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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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27 a.used = sizes[x];
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28
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29 /* now loop */
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30 res = 0;
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31 for (;;) {
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32 a.dp[0] += 4;
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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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38 mp_div_2(&b, &b);
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39 mp_prime_is_prime(&b, 3, &res);
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40 if (res == 0) continue;
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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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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 $ */