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annotate libtomcrypt/tests/prng_test.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9 #include <tomcrypt_test.h>
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10
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11 #ifdef LTC_PRNG_ENABLE_LTC_RNG
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12
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13 static unsigned long my_test_rng_read;
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14
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15 static unsigned long my_test_rng(unsigned char *buf, unsigned long len,
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16 void (*callback)(void))
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17 {
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18 unsigned long n;
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19 LTC_UNUSED_PARAM(callback);
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20 for (n = 0; n < len; ++n) {
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21 buf[n] = 4;
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22 }
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23 my_test_rng_read += n;
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24 return n;
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25 }
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26
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27 #endif
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28
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29 int prng_test(void)
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30 {
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31 int err = CRYPT_NOP;
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32 int x;
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33 unsigned char buf[4096] = { 0 };
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34 unsigned long n, one;
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35 prng_state nprng;
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36
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37 #ifdef LTC_PRNG_ENABLE_LTC_RNG
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38 unsigned long before;
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39
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40 unsigned long (*previous)(unsigned char *, unsigned long , void (*)(void)) = ltc_rng;
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41 ltc_rng = my_test_rng;
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42
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43 before = my_test_rng_read;
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44
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45 if ((err = rng_make_prng(128, find_prng("yarrow"), &yarrow_prng, NULL)) != CRYPT_OK) {
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46 fprintf(stderr, "rng_make_prng with 'my_test_rng' failed: %s\n", error_to_string(err));
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47 exit(EXIT_FAILURE);
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48 }
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49
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50 if (before == my_test_rng_read) {
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51 fprintf(stderr, "somehow there was no read from the ltc_rng! %lu == %lu\n", before, my_test_rng_read);
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52 exit(EXIT_FAILURE);
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53 }
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54
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55 ltc_rng = previous;
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56 #endif
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57
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58 /* test prngs (test, import/export) */
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59 for (x = 0; prng_descriptor[x].name != NULL; x++) {
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60 if(strstr(prng_descriptor[x].name, "no_prng") == prng_descriptor[x].name) continue;
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61 err = CRYPT_OK;
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62 DOX(prng_descriptor[x].test(), prng_descriptor[x].name);
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63 DOX(prng_descriptor[x].start(&nprng), prng_descriptor[x].name);
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64 DOX(prng_descriptor[x].add_entropy((unsigned char *)"helloworld12", 12, &nprng), prng_descriptor[x].name);
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65 DOX(prng_descriptor[x].ready(&nprng), prng_descriptor[x].name);
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66 n = sizeof(buf);
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67 if (strcmp(prng_descriptor[x].name, "sprng")) {
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68 one = 1;
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69 if (prng_descriptor[x].pexport(buf, &one, &nprng) != CRYPT_BUFFER_OVERFLOW) {
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70 fprintf(stderr, "Error testing pexport with a short buffer (%s)\n", prng_descriptor[x].name);
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71 return CRYPT_ERROR;
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72 }
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73 }
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74 DOX(prng_descriptor[x].pexport(buf, &n, &nprng), prng_descriptor[x].name);
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75 prng_descriptor[x].done(&nprng);
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76 DOX(prng_descriptor[x].pimport(buf, n, &nprng), prng_descriptor[x].name);
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77 DOX(prng_descriptor[x].pimport(buf, 4096, &nprng), prng_descriptor[x].name); /* try to import larger data */
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78 DOX(prng_descriptor[x].ready(&nprng), prng_descriptor[x].name);
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79 if (prng_descriptor[x].read(buf, 100, &nprng) != 100) {
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80 fprintf(stderr, "Error reading from imported PRNG (%s)!\n", prng_descriptor[x].name);
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81 return CRYPT_ERROR;
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82 }
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83 prng_descriptor[x].done(&nprng);
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84 }
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85 return err;
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86 }
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87
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88 /* ref: $Format:%D$ */
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89 /* git commit: $Format:%H$ */
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90 /* commit time: $Format:%ai$ */