/* * Copyright 2011-2020 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ /* * RAND_DRBG_set is deprecated for public use, but still ok for * internal use. */ #include "internal/deprecated.h" #include #include "internal/nelem.h" #include #include #include #include #include #include #include "../crypto/rand/rand_local.h" #include "../include/crypto/rand.h" #include "../providers/implementations/rands/drbg_local.h" #include "../crypto/evp/evp_local.h" #if defined(_WIN32) # include #endif #if defined(OPENSSL_SYS_UNIX) # include # include # include #endif #include "testutil.h" #include "drbgtest.h" typedef struct drbg_selftest_data_st { int post; int nid; unsigned int flags; /* KAT data for no PR */ const unsigned char *entropy; size_t entropylen; const unsigned char *nonce; size_t noncelen; const unsigned char *pers; size_t perslen; const unsigned char *adin; size_t adinlen; const unsigned char *entropyreseed; size_t entropyreseedlen; const unsigned char *adinreseed; size_t adinreseedlen; const unsigned char *adin2; size_t adin2len; const unsigned char *expected; size_t exlen; const unsigned char *kat2; size_t kat2len; /* KAT data for PR */ const unsigned char *entropy_pr; size_t entropylen_pr; const unsigned char *nonce_pr; size_t noncelen_pr; const unsigned char *pers_pr; size_t perslen_pr; const unsigned char *adin_pr; size_t adinlen_pr; const unsigned char *entropypr_pr; size_t entropyprlen_pr; const unsigned char *ading_pr; size_t adinglen_pr; const unsigned char *entropyg_pr; size_t entropyglen_pr; const unsigned char *kat_pr; size_t katlen_pr; const unsigned char *kat2_pr; size_t kat2len_pr; } DRBG_SELFTEST_DATA; #define make_drbg_test_data(nid, flag, pr, post) {\ post, nid, flag, \ pr##_entropyinput, sizeof(pr##_entropyinput), \ pr##_nonce, sizeof(pr##_nonce), \ pr##_personalizationstring, sizeof(pr##_personalizationstring), \ pr##_additionalinput, sizeof(pr##_additionalinput), \ pr##_entropyinputreseed, sizeof(pr##_entropyinputreseed), \ pr##_additionalinputreseed, sizeof(pr##_additionalinputreseed), \ pr##_additionalinput2, sizeof(pr##_additionalinput2), \ pr##_int_returnedbits, sizeof(pr##_int_returnedbits), \ pr##_returnedbits, sizeof(pr##_returnedbits), \ pr##_pr_entropyinput, sizeof(pr##_pr_entropyinput), \ pr##_pr_nonce, sizeof(pr##_pr_nonce), \ pr##_pr_personalizationstring, sizeof(pr##_pr_personalizationstring), \ pr##_pr_additionalinput, sizeof(pr##_pr_additionalinput), \ pr##_pr_entropyinputpr, sizeof(pr##_pr_entropyinputpr), \ pr##_pr_additionalinput2, sizeof(pr##_pr_additionalinput2), \ pr##_pr_entropyinputpr2, sizeof(pr##_pr_entropyinputpr2), \ pr##_pr_int_returnedbits, sizeof(pr##_pr_int_returnedbits), \ pr##_pr_returnedbits, sizeof(pr##_pr_returnedbits) \ } #define make_drbg_test_data_use_df(nid, pr, p) \ make_drbg_test_data(nid, 0, pr, p) #define make_drbg_test_data_no_df(nid, pr, p) \ make_drbg_test_data(nid, RAND_DRBG_FLAG_CTR_NO_DF, pr, p) #define make_drbg_test_data_hash(nid, pr, p) \ make_drbg_test_data(nid, RAND_DRBG_FLAG_HMAC, hmac_##pr, p), \ make_drbg_test_data(nid, 0, pr, p) static DRBG_SELFTEST_DATA drbg_test[] = { #ifndef FIPS_MODULE /* FIPS mode doesn't support CTR DRBG without a derivation function */ make_drbg_test_data_no_df (NID_aes_128_ctr, aes_128_no_df, 0), make_drbg_test_data_no_df (NID_aes_192_ctr, aes_192_no_df, 0), make_drbg_test_data_no_df (NID_aes_256_ctr, aes_256_no_df, 1), #endif make_drbg_test_data_use_df(NID_aes_128_ctr, aes_128_use_df, 0), make_drbg_test_data_use_df(NID_aes_192_ctr, aes_192_use_df, 0), make_drbg_test_data_use_df(NID_aes_256_ctr, aes_256_use_df, 1), make_drbg_test_data_hash(NID_sha1, sha1, 0), make_drbg_test_data_hash(NID_sha224, sha224, 0), make_drbg_test_data_hash(NID_sha256, sha256, 1), make_drbg_test_data_hash(NID_sha384, sha384, 0), make_drbg_test_data_hash(NID_sha512, sha512, 0), }; /* * DRBG query functions */ static int state(RAND_DRBG *drbg) { return EVP_RAND_state(drbg->rand); } static size_t query_rand_size_t(RAND_DRBG *drbg, const char *name) { OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; size_t n; *params = OSSL_PARAM_construct_size_t(name, &n); if (EVP_RAND_get_ctx_params(drbg->rand, params)) return n; return 0; } static unsigned int query_rand_uint(RAND_DRBG *drbg, const char *name) { OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; unsigned int n; *params = OSSL_PARAM_construct_uint(name, &n); if (EVP_RAND_get_ctx_params(drbg->rand, params)) return n; return 0; } #define DRBG_SIZE_T(name) \ static size_t name(RAND_DRBG *drbg) \ { \ return query_rand_size_t(drbg, #name); \ } DRBG_SIZE_T(min_entropylen) DRBG_SIZE_T(max_entropylen) DRBG_SIZE_T(min_noncelen) DRBG_SIZE_T(max_noncelen) DRBG_SIZE_T(max_perslen) DRBG_SIZE_T(max_adinlen) DRBG_SIZE_T(max_request) #define DRBG_UINT(name) \ static unsigned int name(RAND_DRBG *drbg) \ { \ return query_rand_uint(drbg, #name); \ } DRBG_UINT(reseed_requests) DRBG_UINT(reseed_counter) static PROV_DRBG *prov_rand(RAND_DRBG *drbg) { return (PROV_DRBG *)drbg->rand->data; } static void set_reseed_counter(RAND_DRBG *drbg, unsigned int n) { PROV_DRBG *p = prov_rand(drbg); p->reseed_counter = n; } static void inc_reseed_counter(RAND_DRBG *drbg) { set_reseed_counter(drbg, reseed_counter(drbg) + 1); } static time_t reseed_time(RAND_DRBG *drbg) { OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END }; time_t t; *params = OSSL_PARAM_construct_time_t(OSSL_DRBG_PARAM_RESEED_TIME, &t); if (EVP_RAND_get_ctx_params(drbg->rand, params)) return t; return 0; } /* * Test context data, attached as EXDATA to the RAND_DRBG */ typedef struct test_ctx_st { const unsigned char *entropy; size_t entropylen; int entropycnt; const unsigned char *nonce; size_t noncelen; int noncecnt; } TEST_CTX; static size_t kat_entropy(RAND_DRBG *drbg, unsigned char **pout, int entropy, size_t min_len, size_t max_len, int prediction_resistance) { TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_callback_data(drbg); t->entropycnt++; *pout = (unsigned char *)t->entropy; return t->entropylen; } static size_t kat_nonce(RAND_DRBG *drbg, unsigned char **pout, int entropy, size_t min_len, size_t max_len) { TEST_CTX *t = (TEST_CTX *)RAND_DRBG_get_callback_data(drbg); t->noncecnt++; *pout = (unsigned char *)t->nonce; return t->noncelen; } /* * When building the FIPS module, it isn't possible to disable the continuous * RNG tests. Tests that require this are skipped. */ static int crngt_skip(void) { #ifdef FIPS_MODULE return 1; #else return 0; #endif } /* * Disable CRNG testing if it is enabled. * This stub remains to indicate the calling locations where it is necessary. * Once the RNG infrastructure is able to disable these tests, it should be * reconstituted. */ static int disable_crngt(RAND_DRBG *drbg) { return 1; } static int uninstantiate(RAND_DRBG *drbg) { int ret = drbg == NULL ? 1 : RAND_DRBG_uninstantiate(drbg); ERR_clear_error(); return ret; } /* * Do a single KAT test. Return 0 on failure. */ static int single_kat(DRBG_SELFTEST_DATA *td) { RAND_DRBG *drbg = NULL; TEST_CTX t; int failures = 0; unsigned char buff[1024]; if (crngt_skip()) return TEST_skip("CRNGT cannot be disabled"); /* * Test without PR: Instantiate DRBG with test entropy, nonce and * personalisation string. */ if (!TEST_ptr(drbg = RAND_DRBG_new(td->nid, td->flags, NULL))) return 0; if (!TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL, kat_nonce, NULL)) || !TEST_true(RAND_DRBG_set_callback_data(drbg, &t)) || !TEST_true(disable_crngt(drbg))) { failures++; goto err; } memset(&t, 0, sizeof(t)); t.entropy = td->entropy; t.entropylen = td->entropylen; t.nonce = td->nonce; t.noncelen = td->noncelen; if (!TEST_true(RAND_DRBG_instantiate(drbg, td->pers, td->perslen)) || !TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0, td->adin, td->adinlen)) || !TEST_mem_eq(td->expected, td->exlen, buff, td->exlen)) failures++; /* Reseed DRBG with test entropy and additional input */ t.entropy = td->entropyreseed; t.entropylen = td->entropyreseedlen; if (!TEST_true(RAND_DRBG_reseed(drbg, td->adinreseed, td->adinreseedlen, 0) || !TEST_true(RAND_DRBG_generate(drbg, buff, td->kat2len, 0, td->adin2, td->adin2len)) || !TEST_mem_eq(td->kat2, td->kat2len, buff, td->kat2len))) failures++; uninstantiate(drbg); /* * Now test with PR: Instantiate DRBG with test entropy, nonce and * personalisation string. */ if (!TEST_true(RAND_DRBG_set(drbg, td->nid, td->flags)) || !TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL, kat_nonce, NULL)) || !TEST_true(RAND_DRBG_set_callback_data(drbg, &t))) failures++; t.entropy = td->entropy_pr; t.entropylen = td->entropylen_pr; t.nonce = td->nonce_pr; t.noncelen = td->noncelen_pr; t.entropycnt = 0; t.noncecnt = 0; if (!TEST_true(RAND_DRBG_instantiate(drbg, td->pers_pr, td->perslen_pr))) failures++; /* * Now generate with PR: we need to supply entropy as this will * perform a reseed operation. */ t.entropy = td->entropypr_pr; t.entropylen = td->entropyprlen_pr; if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->katlen_pr, 1, td->adin_pr, td->adinlen_pr)) || !TEST_mem_eq(td->kat_pr, td->katlen_pr, buff, td->katlen_pr)) failures++; /* * Now generate again with PR: supply new entropy again. */ t.entropy = td->entropyg_pr; t.entropylen = td->entropyglen_pr; if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->kat2len_pr, 1, td->ading_pr, td->adinglen_pr)) || !TEST_mem_eq(td->kat2_pr, td->kat2len_pr, buff, td->kat2len_pr)) failures++; err: uninstantiate(drbg); RAND_DRBG_free(drbg); return failures == 0; } /* * Initialise a DRBG based on selftest data */ static int init(RAND_DRBG *drbg, DRBG_SELFTEST_DATA *td, TEST_CTX *t) { if (!TEST_true(RAND_DRBG_set(drbg, td->nid, td->flags)) || !TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL, kat_nonce, NULL))) return 0; RAND_DRBG_set_callback_data(drbg, t); t->entropy = td->entropy; t->entropylen = td->entropylen; t->nonce = td->nonce; t->noncelen = td->noncelen; t->entropycnt = 0; t->noncecnt = 0; return 1; } /* * Initialise and instantiate DRBG based on selftest data */ static int instantiate(RAND_DRBG *drbg, DRBG_SELFTEST_DATA *td, TEST_CTX *t) { if (!TEST_true(init(drbg, td, t)) || !TEST_true(RAND_DRBG_instantiate(drbg, td->pers, td->perslen))) return 0; return 1; } /* * Perform extensive error checking as required by SP800-90. * Induce several failure modes and check an error condition is set. */ static int error_check(DRBG_SELFTEST_DATA *td) { RAND_DRBG *drbg = NULL; TEST_CTX t; unsigned char buff[1024]; unsigned int reseed_counter_tmp; int ret = 0; if (!TEST_ptr(drbg = RAND_DRBG_new(td->nid, td->flags, NULL)) || !TEST_true(disable_crngt(drbg))) goto err; /* * Personalisation string tests */ /* Test detection of too large personalisation string */ if (!init(drbg, td, &t) || !TEST_false(RAND_DRBG_instantiate(drbg, td->pers, max_perslen(drbg) + 1))) goto err; /* * Entropy source tests */ /* Test entropy source failure detection: i.e. returns no data */ t.entropylen = 0; if (!TEST_false(RAND_DRBG_instantiate(drbg, td->pers, td->perslen))) goto err; /* Try to generate output from uninstantiated DRBG */ if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 0, td->adin, td->adinlen)) || !uninstantiate(drbg)) goto err; /* Test insufficient entropy */ if (!init(drbg, td, &t)) goto err; t.entropylen = min_entropylen(drbg) - 1; if (!TEST_false(RAND_DRBG_instantiate(drbg, td->pers, td->perslen)) || !uninstantiate(drbg)) goto err; /* Test too much entropy */ if (!init(drbg, td, &t)) goto err; t.entropylen = max_entropylen(drbg) + 1; if (!TEST_false(RAND_DRBG_instantiate(drbg, td->pers, td->perslen)) || !uninstantiate(drbg)) goto err; /* * Nonce tests */ /* Test too small nonce */ if (min_noncelen(drbg) != 0) { if (!init(drbg, td, &t)) goto err; t.noncelen = min_noncelen(drbg) - 1; if (!TEST_false(RAND_DRBG_instantiate(drbg, td->pers, td->perslen)) || !uninstantiate(drbg)) goto err; } /* Test too large nonce */ if (max_noncelen(drbg) != 0) { if (!init(drbg, td, &t)) goto err; t.noncelen = max_noncelen(drbg) + 1; if (!TEST_false(RAND_DRBG_instantiate(drbg, td->pers, td->perslen)) || !uninstantiate(drbg)) goto err; } /* Instantiate with valid data, Check generation is now OK */ if (!instantiate(drbg, td, &t) || !TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0, td->adin, td->adinlen))) goto err; /* Request too much data for one request */ if (!TEST_false(RAND_DRBG_generate(drbg, buff, max_request(drbg) + 1, 0, td->adin, td->adinlen))) goto err; /* Try too large additional input */ if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 0, td->adin, max_adinlen(drbg) + 1))) goto err; /* * Check prediction resistance request fails if entropy source * failure. */ t.entropylen = 0; if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 1, td->adin, td->adinlen)) || !uninstantiate(drbg)) goto err; /* Instantiate again with valid data */ if (!instantiate(drbg, td, &t)) goto err; reseed_counter_tmp = reseed_counter(drbg); set_reseed_counter(drbg, reseed_requests(drbg) + 1); /* Generate output and check entropy has been requested for reseed */ t.entropycnt = 0; if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0, td->adin, td->adinlen)) || !TEST_int_eq(t.entropycnt, 1) || !TEST_int_eq(reseed_counter(drbg), reseed_counter_tmp + 1) || !uninstantiate(drbg)) goto err; /* * Check prediction resistance request fails if entropy source * failure. */ t.entropylen = 0; if (!TEST_false(RAND_DRBG_generate(drbg, buff, td->exlen, 1, td->adin, td->adinlen)) || !uninstantiate(drbg)) goto err; /* Test reseed counter works */ if (!instantiate(drbg, td, &t)) goto err; reseed_counter_tmp = reseed_counter(drbg); set_reseed_counter(drbg, reseed_requests(drbg) + 1); /* Generate output and check entropy has been requested for reseed */ t.entropycnt = 0; if (!TEST_true(RAND_DRBG_generate(drbg, buff, td->exlen, 0, td->adin, td->adinlen)) || !TEST_int_eq(t.entropycnt, 1) || !TEST_int_eq(reseed_counter(drbg), reseed_counter_tmp + 1) || !uninstantiate(drbg)) goto err; /* * Explicit reseed tests */ /* Test explicit reseed with too large additional input */ if (!instantiate(drbg, td, &t) || !TEST_false(RAND_DRBG_reseed(drbg, td->adin, max_adinlen(drbg) + 1, 0))) goto err; /* Test explicit reseed with entropy source failure */ t.entropylen = 0; if (!TEST_false(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0)) || !uninstantiate(drbg)) goto err; /* Test explicit reseed with too much entropy */ if (!instantiate(drbg, td, &t)) goto err; t.entropylen = max_entropylen(drbg) + 1; if (!TEST_false(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0)) || !uninstantiate(drbg)) goto err; /* Test explicit reseed with too little entropy */ if (!instantiate(drbg, td, &t)) goto err; t.entropylen = min_entropylen(drbg) - 1; if (!TEST_false(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0)) || !uninstantiate(drbg)) goto err; /* Standard says we have to check uninstantiate really zeroes */ if (!TEST_true(EVP_RAND_verify_zeroization(drbg->rand))) goto err; ret = 1; err: uninstantiate(drbg); RAND_DRBG_free(drbg); return ret; } static int test_kats(int i) { DRBG_SELFTEST_DATA *td = &drbg_test[i]; int rv = 0; if (!single_kat(td)) goto err; rv = 1; err: return rv; } static int test_error_checks(int i) { DRBG_SELFTEST_DATA *td = &drbg_test[i]; int rv = 0; if (crngt_skip()) return TEST_skip("CRNGT cannot be disabled"); if (!error_check(td)) goto err; rv = 1; err: return rv; } /* * Generates random output using RAND_bytes() and RAND_priv_bytes() * and checks whether the three shared DRBGs were reseeded as * expected. * * |expect_success|: expected outcome (as reported by RAND_status()) * |primary|, |public|, |private|: pointers to the three shared DRBGs * |expect_xxx_reseed| = * 1: it is expected that the specified DRBG is reseeded * 0: it is expected that the specified DRBG is not reseeded * -1: don't check whether the specified DRBG was reseeded or not * |reseed_time|: if nonzero, used instead of time(NULL) to set the * |before_reseed| time. */ static int test_drbg_reseed(int expect_success, RAND_DRBG *primary, RAND_DRBG *public, RAND_DRBG *private, int expect_primary_reseed, int expect_public_reseed, int expect_private_reseed, time_t reseed_when ) { unsigned char buf[32]; time_t before_reseed, after_reseed; int expected_state = (expect_success ? DRBG_READY : DRBG_ERROR); unsigned int primary_reseed, public_reseed, private_reseed; /* * step 1: check preconditions */ /* Test whether seed propagation is enabled */ if (!TEST_int_ne(primary_reseed = reseed_counter(primary), 0) || !TEST_int_ne(public_reseed = reseed_counter(public), 0) || !TEST_int_ne(private_reseed = reseed_counter(private), 0)) return 0; /* * step 2: generate random output */ if (reseed_when == 0) reseed_when = time(NULL); /* Generate random output from the public and private DRBG */ before_reseed = expect_primary_reseed == 1 ? reseed_when : 0; if (!TEST_int_eq(RAND_bytes(buf, sizeof(buf)), expect_success) || !TEST_int_eq(RAND_priv_bytes(buf, sizeof(buf)), expect_success)) return 0; after_reseed = time(NULL); /* * step 3: check postconditions */ /* Test whether reseeding succeeded as expected */ if (/*!TEST_int_eq(state(primary), expected_state) || */!TEST_int_eq(state(public), expected_state) || !TEST_int_eq(state(private), expected_state)) return 0; if (expect_primary_reseed >= 0) { /* Test whether primary DRBG was reseeded as expected */ if (!TEST_int_ge(reseed_counter(primary), primary_reseed)) return 0; } if (expect_public_reseed >= 0) { /* Test whether public DRBG was reseeded as expected */ if (!TEST_int_ge(reseed_counter(public), public_reseed) || !TEST_uint_ge(reseed_counter(public), reseed_counter(primary))) return 0; } if (expect_private_reseed >= 0) { /* Test whether public DRBG was reseeded as expected */ if (!TEST_int_ge(reseed_counter(private), private_reseed) || !TEST_uint_ge(reseed_counter(private), reseed_counter(primary))) return 0; } if (expect_success == 1) { /* Test whether reseed time of primary DRBG is set correctly */ if (!TEST_time_t_le(before_reseed, reseed_time(primary)) || !TEST_time_t_le(reseed_time(primary), after_reseed)) return 0; /* Test whether reseed times of child DRBGs are synchronized with primary */ if (!TEST_time_t_ge(reseed_time(public), reseed_time(primary)) || !TEST_time_t_ge(reseed_time(private), reseed_time(primary))) return 0; } else { ERR_clear_error(); } return 1; } #if defined(OPENSSL_SYS_UNIX) /* * Test whether primary, public and private DRBG are reseeded after * forking the process. */ static int test_drbg_reseed_after_fork(RAND_DRBG *primary, RAND_DRBG *public, RAND_DRBG *private) { pid_t pid; int status=0; pid = fork(); if (!TEST_int_ge(pid, 0)) return 0; if (pid > 0) { /* I'm the parent; wait for the child and check its exit code */ return TEST_int_eq(waitpid(pid, &status, 0), pid) && TEST_int_eq(status, 0); } /* I'm the child; check whether all three DRBGs reseed. */ if (!TEST_true(test_drbg_reseed(1, primary, public, private, 1, 1, 1, 0))) status = 1; exit(status); } #endif /* * Test whether the default rand_method (RAND_OpenSSL()) is * setup correctly, in particular whether reseeding works * as designed. */ static int test_rand_drbg_reseed(void) { RAND_DRBG *primary, *public, *private; unsigned char rand_add_buf[256]; int rv = 0; time_t before_reseed; if (crngt_skip()) return TEST_skip("CRNGT cannot be disabled"); /* Check whether RAND_OpenSSL() is the default method */ if (!TEST_ptr_eq(RAND_get_rand_method(), RAND_OpenSSL())) return 0; /* All three DRBGs should be non-null */ if (!TEST_ptr(primary = RAND_DRBG_get0_master()) || !TEST_ptr(public = RAND_DRBG_get0_public()) || !TEST_ptr(private = RAND_DRBG_get0_private())) return 0; /* There should be three distinct DRBGs, two of them chained to primary */ if (!TEST_ptr_ne(public, private) || !TEST_ptr_ne(public, primary) || !TEST_ptr_ne(private, primary) || !TEST_ptr_eq(public->parent, primary) || !TEST_ptr_eq(private->parent, primary)) return 0; /* Disable CRNG testing for the primary DRBG */ if (!TEST_true(disable_crngt(primary))) return 0; /* uninstantiate the three global DRBGs */ RAND_DRBG_uninstantiate(primary); RAND_DRBG_uninstantiate(private); RAND_DRBG_uninstantiate(public); /* * Test initial seeding of shared DRBGs */ if (!TEST_true(test_drbg_reseed(1, primary, public, private, 1, 1, 1, 0))) goto error; /* * Test initial state of shared DRBGs */ if (!TEST_true(test_drbg_reseed(1, primary, public, private, 0, 0, 0, 0))) goto error; /* * Test whether the public and private DRBG are both reseeded when their * reseed counters differ from the primary's reseed counter. */ inc_reseed_counter(primary); if (!TEST_true(test_drbg_reseed(1, primary, public, private, 0, 1, 1, 0))) goto error; /* * Test whether the public DRBG is reseeded when its reseed counter differs * from the primary's reseed counter. */ inc_reseed_counter(primary); inc_reseed_counter(private); if (!TEST_true(test_drbg_reseed(1, primary, public, private, 0, 1, 0, 0))) goto error; /* * Test whether the private DRBG is reseeded when its reseed counter differs * from the primary's reseed counter. */ inc_reseed_counter(primary); inc_reseed_counter(public); if (!TEST_true(test_drbg_reseed(1, primary, public, private, 0, 0, 1, 0))) goto error; #if defined(OPENSSL_SYS_UNIX) if (!TEST_true(test_drbg_reseed_after_fork(primary, public, private))) goto error; #endif /* fill 'randomness' buffer with some arbitrary data */ memset(rand_add_buf, 'r', sizeof(rand_add_buf)); #ifndef FIPS_MODULE /* * Test whether all three DRBGs are reseeded by RAND_add(). * The before_reseed time has to be measured here and passed into the * test_drbg_reseed() test, because the primary DRBG gets already reseeded * in RAND_add(), whence the check for the condition * before_reseed <= reseed_time(primary) will fail if the time value happens * to increase between the RAND_add() and the test_drbg_reseed() call. */ before_reseed = time(NULL); RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf)); if (!TEST_true(test_drbg_reseed(1, primary, public, private, 1, 1, 1, before_reseed))) goto error; #else /* FIPS_MODULE */ /* * In FIPS mode, random data provided by the application via RAND_add() * is not considered a trusted entropy source. It is only treated as * additional_data and no reseeding is forced. This test assures that * no reseeding occurs. */ before_reseed = time(NULL); RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf)); if (!TEST_true(test_drbg_reseed(1, primary, public, private, 0, 0, 0, before_reseed))) goto error; #endif rv = 1; error: return rv; } #if defined(OPENSSL_THREADS) static int multi_thread_rand_bytes_succeeded = 1; static int multi_thread_rand_priv_bytes_succeeded = 1; static void run_multi_thread_test(void) { unsigned char buf[256]; time_t start = time(NULL); RAND_DRBG *public = NULL, *private = NULL; if (!TEST_ptr(public = RAND_DRBG_get0_public()) || !TEST_ptr(private = RAND_DRBG_get0_private())) { multi_thread_rand_bytes_succeeded = 0; return; } RAND_DRBG_set_reseed_time_interval(private, 1); RAND_DRBG_set_reseed_time_interval(public, 1); do { if (RAND_bytes(buf, sizeof(buf)) <= 0) multi_thread_rand_bytes_succeeded = 0; if (RAND_priv_bytes(buf, sizeof(buf)) <= 0) multi_thread_rand_priv_bytes_succeeded = 0; } while(time(NULL) - start < 5); } # if defined(OPENSSL_SYS_WINDOWS) typedef HANDLE thread_t; static DWORD WINAPI thread_run(LPVOID arg) { run_multi_thread_test(); /* * Because we're linking with a static library, we must stop each * thread explicitly, or so says OPENSSL_thread_stop(3) */ OPENSSL_thread_stop(); return 0; } static int run_thread(thread_t *t) { *t = CreateThread(NULL, 0, thread_run, NULL, 0, NULL); return *t != NULL; } static int wait_for_thread(thread_t thread) { return WaitForSingleObject(thread, INFINITE) == 0; } # else typedef pthread_t thread_t; static void *thread_run(void *arg) { run_multi_thread_test(); /* * Because we're linking with a static library, we must stop each * thread explicitly, or so says OPENSSL_thread_stop(3) */ OPENSSL_thread_stop(); return NULL; } static int run_thread(thread_t *t) { return pthread_create(t, NULL, thread_run, NULL) == 0; } static int wait_for_thread(thread_t thread) { return pthread_join(thread, NULL) == 0; } # endif /* * The main thread will also run the test, so we'll have THREADS+1 parallel * tests running */ # define THREADS 3 static int test_multi_thread(void) { thread_t t[THREADS]; int i; for (i = 0; i < THREADS; i++) run_thread(&t[i]); run_multi_thread_test(); for (i = 0; i < THREADS; i++) wait_for_thread(t[i]); if (!TEST_true(multi_thread_rand_bytes_succeeded)) return 0; if (!TEST_true(multi_thread_rand_priv_bytes_succeeded)) return 0; return 1; } #endif static int test_rand_drbg_prediction_resistance(void) { RAND_DRBG *x = NULL, *y = NULL, *z = NULL; unsigned char buf1[51], buf2[sizeof(buf1)]; int ret = 0, xreseed, yreseed, zreseed; if (crngt_skip()) return TEST_skip("CRNGT cannot be disabled"); /* Initialise a three long DRBG chain */ if (!TEST_ptr(x = RAND_DRBG_new(0, 0, NULL)) || !TEST_true(disable_crngt(x)) || !TEST_true(RAND_DRBG_instantiate(x, NULL, 0)) || !TEST_ptr(y = RAND_DRBG_new(0, 0, x)) || !TEST_true(RAND_DRBG_instantiate(y, NULL, 0)) || !TEST_ptr(z = RAND_DRBG_new(0, 0, y)) || !TEST_true(RAND_DRBG_instantiate(z, NULL, 0))) goto err; /* * During a normal reseed, only the last DRBG in the chain should * be reseeded. */ inc_reseed_counter(y); xreseed = reseed_counter(x); yreseed = reseed_counter(y); zreseed = reseed_counter(z); if (!TEST_true(RAND_DRBG_reseed(z, NULL, 0, 0)) || !TEST_int_eq(reseed_counter(x), xreseed) || !TEST_int_eq(reseed_counter(y), yreseed) || !TEST_int_gt(reseed_counter(z), zreseed)) goto err; /* * When prediction resistance is requested, the request should be * propagated to the primary, so that the entire DRBG chain reseeds. */ zreseed = reseed_counter(z); if (!TEST_true(RAND_DRBG_reseed(z, NULL, 0, 1)) || !TEST_int_gt(reseed_counter(x), xreseed) || !TEST_int_gt(reseed_counter(y), yreseed) || !TEST_int_gt(reseed_counter(z), zreseed)) goto err; /* * During a normal generate, only the last DRBG should be reseed */ inc_reseed_counter(y); xreseed = reseed_counter(x); yreseed = reseed_counter(y); zreseed = reseed_counter(z); if (!TEST_true(RAND_DRBG_generate(z, buf1, sizeof(buf1), 0, NULL, 0)) || !TEST_int_eq(reseed_counter(x), xreseed) || !TEST_int_eq(reseed_counter(y), yreseed) || !TEST_int_gt(reseed_counter(z), zreseed)) goto err; /* * When a prediction resistant generate is requested, the request * should be propagated to the primary, reseeding the entire DRBG chain. */ zreseed = reseed_counter(z); if (!TEST_true(RAND_DRBG_generate(z, buf2, sizeof(buf2), 1, NULL, 0)) || !TEST_int_gt(reseed_counter(x), xreseed) || !TEST_int_gt(reseed_counter(y), yreseed) || !TEST_int_gt(reseed_counter(z), zreseed) || !TEST_mem_ne(buf1, sizeof(buf1), buf2, sizeof(buf2))) goto err; /* Verify that a normal reseed still only reseeds the last DRBG */ inc_reseed_counter(y); xreseed = reseed_counter(x); yreseed = reseed_counter(y); zreseed = reseed_counter(z); if (!TEST_true(RAND_DRBG_reseed(z, NULL, 0, 0)) || !TEST_int_eq(reseed_counter(x), xreseed) || !TEST_int_eq(reseed_counter(y), yreseed) || !TEST_int_gt(reseed_counter(z), zreseed)) goto err; ret = 1; err: RAND_DRBG_free(z); RAND_DRBG_free(y); RAND_DRBG_free(x); return ret; } static int test_multi_set(void) { int rv = 0; RAND_DRBG *drbg = NULL; if (crngt_skip()) return TEST_skip("CRNGT cannot be disabled"); /* init drbg with default CTR initializer */ if (!TEST_ptr(drbg = RAND_DRBG_new(0, 0, NULL)) || !TEST_true(disable_crngt(drbg))) goto err; /* change it to use hmac */ if (!TEST_true(RAND_DRBG_set(drbg, NID_sha1, RAND_DRBG_FLAG_HMAC))) goto err; /* use same type */ if (!TEST_true(RAND_DRBG_set(drbg, NID_sha1, RAND_DRBG_FLAG_HMAC))) goto err; /* change it to use hash */ if (!TEST_true(RAND_DRBG_set(drbg, NID_sha256, 0))) goto err; /* use same type */ if (!TEST_true(RAND_DRBG_set(drbg, NID_sha256, 0))) goto err; /* change it to use ctr */ if (!TEST_true(RAND_DRBG_set(drbg, NID_aes_192_ctr, 0))) goto err; /* use same type */ if (!TEST_true(RAND_DRBG_set(drbg, NID_aes_192_ctr, 0))) goto err; if (!TEST_int_gt(RAND_DRBG_instantiate(drbg, NULL, 0), 0)) goto err; rv = 1; err: uninstantiate(drbg); RAND_DRBG_free(drbg); return rv; } static int test_set_defaults(void) { RAND_DRBG *primary = NULL, *public = NULL, *private = NULL; /* Check the default type and flags for primary, public and private */ return TEST_ptr(primary = RAND_DRBG_get0_master()) && TEST_ptr(public = RAND_DRBG_get0_public()) && TEST_ptr(private = RAND_DRBG_get0_private()) && TEST_int_eq(primary->type, RAND_DRBG_TYPE) && TEST_int_eq(primary->flags, RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PRIMARY) && TEST_int_eq(public->type, RAND_DRBG_TYPE) && TEST_int_eq(public->flags, RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PUBLIC) && TEST_int_eq(private->type, RAND_DRBG_TYPE) && TEST_int_eq(private->flags, RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PRIVATE) /* change primary DRBG and check again */ && TEST_true(RAND_DRBG_set_defaults(NID_sha256, RAND_DRBG_FLAG_PRIMARY)) && TEST_true(RAND_DRBG_uninstantiate(primary)) && TEST_int_eq(primary->type, NID_sha256) && TEST_int_eq(primary->flags, RAND_DRBG_FLAG_PRIMARY) && TEST_int_eq(public->type, RAND_DRBG_TYPE) && TEST_int_eq(public->flags, RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PUBLIC) && TEST_int_eq(private->type, RAND_DRBG_TYPE) && TEST_int_eq(private->flags, RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PRIVATE) /* change private DRBG and check again */ && TEST_true(RAND_DRBG_set_defaults(NID_sha256, RAND_DRBG_FLAG_PRIVATE|RAND_DRBG_FLAG_HMAC)) && TEST_true(RAND_DRBG_uninstantiate(private)) && TEST_int_eq(primary->type, NID_sha256) && TEST_int_eq(primary->flags, RAND_DRBG_FLAG_PRIMARY) && TEST_int_eq(public->type, RAND_DRBG_TYPE) && TEST_int_eq(public->flags, RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PUBLIC) && TEST_int_eq(private->type, NID_sha256) && TEST_int_eq(private->flags, RAND_DRBG_FLAG_PRIVATE | RAND_DRBG_FLAG_HMAC) /* change public DRBG and check again */ && TEST_true(RAND_DRBG_set_defaults(NID_sha1, RAND_DRBG_FLAG_PUBLIC | RAND_DRBG_FLAG_HMAC)) && TEST_true(RAND_DRBG_uninstantiate(public)) && TEST_int_eq(primary->type, NID_sha256) && TEST_int_eq(primary->flags, RAND_DRBG_FLAG_PRIMARY) && TEST_int_eq(public->type, NID_sha1) && TEST_int_eq(public->flags, RAND_DRBG_FLAG_PUBLIC | RAND_DRBG_FLAG_HMAC) && TEST_int_eq(private->type, NID_sha256) && TEST_int_eq(private->flags, RAND_DRBG_FLAG_PRIVATE | RAND_DRBG_FLAG_HMAC) /* Change DRBG defaults and change public and check again */ && TEST_true(RAND_DRBG_set_defaults(NID_sha256, 0)) && TEST_true(RAND_DRBG_uninstantiate(public)) && TEST_int_eq(public->type, NID_sha256) && TEST_int_eq(public->flags, RAND_DRBG_FLAG_PUBLIC) /* FIPS mode doesn't support CTR DRBG without a derivation function */ #ifndef FIPS_MODULE /* Change DRBG defaults and change primary and check again */ && TEST_true(RAND_DRBG_set_defaults(NID_aes_256_ctr, RAND_DRBG_FLAG_CTR_NO_DF)) && TEST_true(RAND_DRBG_uninstantiate(primary)) && TEST_int_eq(primary->type, NID_aes_256_ctr) && TEST_int_eq(primary->flags, RAND_DRBG_FLAG_PRIMARY|RAND_DRBG_FLAG_CTR_NO_DF) #endif /* Reset back to the standard defaults */ && TEST_true(RAND_DRBG_set_defaults(RAND_DRBG_TYPE, RAND_DRBG_FLAGS | RAND_DRBG_FLAG_PRIMARY | RAND_DRBG_FLAG_PUBLIC | RAND_DRBG_FLAG_PRIVATE)) && TEST_true(RAND_DRBG_uninstantiate(primary)) && TEST_true(RAND_DRBG_uninstantiate(public)) && TEST_true(RAND_DRBG_uninstantiate(private)); } #if 0 /* * A list of the FIPS DRGB types. * Because of the way HMAC DRGBs are implemented, both the NID and flags * are required. */ static const struct s_drgb_types { int nid; int flags; } drgb_types[] = { { NID_aes_128_ctr, 0 }, { NID_aes_192_ctr, 0 }, { NID_aes_256_ctr, 0 }, { NID_sha1, 0 }, { NID_sha224, 0 }, { NID_sha256, 0 }, { NID_sha384, 0 }, { NID_sha512, 0 }, { NID_sha512_224, 0 }, { NID_sha512_256, 0 }, { NID_sha3_224, 0 }, { NID_sha3_256, 0 }, { NID_sha3_384, 0 }, { NID_sha3_512, 0 }, { NID_sha1, RAND_DRBG_FLAG_HMAC }, { NID_sha224, RAND_DRBG_FLAG_HMAC }, { NID_sha256, RAND_DRBG_FLAG_HMAC }, { NID_sha384, RAND_DRBG_FLAG_HMAC }, { NID_sha512, RAND_DRBG_FLAG_HMAC }, { NID_sha512_224, RAND_DRBG_FLAG_HMAC }, { NID_sha512_256, RAND_DRBG_FLAG_HMAC }, { NID_sha3_224, RAND_DRBG_FLAG_HMAC }, { NID_sha3_256, RAND_DRBG_FLAG_HMAC }, { NID_sha3_384, RAND_DRBG_FLAG_HMAC }, { NID_sha3_512, RAND_DRBG_FLAG_HMAC }, }; /* Six cases for each covers seed sizes up to 32 bytes */ static const size_t crngt_num_cases = 6; static size_t crngt_case, crngt_idx; static int crngt_entropy_cb(OPENSSL_CTX *ctx, RAND_POOL *pool, unsigned char *buf, unsigned char *md, unsigned int *md_size) { size_t i, z; if (!TEST_int_lt(crngt_idx, crngt_num_cases)) return 0; /* Generate a block of unique data unless this is the duplication point */ z = crngt_idx++; if (z > 0 && crngt_case == z) z--; for (i = 0; i < CRNGT_BUFSIZ; i++) buf[i] = (unsigned char)(i + 'A' + z); return EVP_Digest(buf, CRNGT_BUFSIZ, md, md_size, EVP_sha256(), NULL); } #endif int setup_tests(void) { ADD_ALL_TESTS(test_kats, 1); ADD_ALL_TESTS(test_error_checks, OSSL_NELEM(drbg_test)); ADD_TEST(test_rand_drbg_reseed); ADD_TEST(test_rand_drbg_prediction_resistance); ADD_TEST(test_multi_set); ADD_TEST(test_set_defaults); #if defined(OPENSSL_THREADS) ADD_TEST(test_multi_thread); #endif return 1; }