/* * Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the OpenSSL license (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 */ #include #include "internal/nelem.h" #include #include #include #include #include #include #include "../crypto/rand/rand_lcl.h" #include "../crypto/include/internal/rand_int.h" #if defined(_WIN32) # 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[] = { 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), 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), }; static int app_data_index; /* * 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_ex_data(drbg, app_data_index); 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_ex_data(drbg, app_data_index); t->noncecnt++; *pout = (unsigned char *)t->nonce; return t->noncelen; } 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]; /* * 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))) { failures++; goto err; } memset(&t, 0, sizeof(t)); t.entropy = td->entropy; t.entropylen = td->entropylen; t.nonce = td->nonce; t.noncelen = td->noncelen; RAND_DRBG_set_ex_data(drbg, app_data_index, &t); 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))) failures++; RAND_DRBG_set_ex_data(drbg, app_data_index, &t); 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_ex_data(drbg, app_data_index, 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) { static char zero[sizeof(RAND_DRBG)]; 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))) goto err; /* * Personalisation string tests */ /* Test detection of too large personlisation string */ if (!init(drbg, td, &t) || RAND_DRBG_instantiate(drbg, td->pers, drbg->max_perslen + 1) > 0) goto err; /* * Entropy source tests */ /* Test entropy source failure detection: i.e. returns no data */ t.entropylen = 0; if (TEST_int_le(RAND_DRBG_instantiate(drbg, td->pers, td->perslen), 0)) 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 */ t.entropylen = drbg->min_entropylen - 1; if (!init(drbg, td, &t) || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0 || !uninstantiate(drbg)) goto err; /* Test too much entropy */ t.entropylen = drbg->max_entropylen + 1; if (!init(drbg, td, &t) || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0 || !uninstantiate(drbg)) goto err; /* * Nonce tests */ /* Test too small nonce */ if (drbg->min_noncelen) { t.noncelen = drbg->min_noncelen - 1; if (!init(drbg, td, &t) || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0 || !uninstantiate(drbg)) goto err; } /* Test too large nonce */ if (drbg->max_noncelen) { t.noncelen = drbg->max_noncelen + 1; if (!init(drbg, td, &t) || RAND_DRBG_instantiate(drbg, td->pers, td->perslen) > 0 || !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, drbg->max_request + 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, drbg->max_adinlen + 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 = drbg->reseed_gen_counter; drbg->reseed_gen_counter = drbg->reseed_interval; /* 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(drbg->reseed_gen_counter, 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 = drbg->reseed_gen_counter; drbg->reseed_gen_counter = drbg->reseed_interval; /* 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(drbg->reseed_gen_counter, reseed_counter_tmp + 1) || !uninstantiate(drbg)) goto err; /* * Explicit reseed tests */ /* Test explicit reseed with too large additional input */ if (!init(drbg, td, &t) || RAND_DRBG_reseed(drbg, td->adin, drbg->max_adinlen + 1, 0) > 0) goto err; /* Test explicit reseed with entropy source failure */ t.entropylen = 0; if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0), 0) || !uninstantiate(drbg)) goto err; /* Test explicit reseed with too much entropy */ if (!init(drbg, td, &t)) goto err; t.entropylen = drbg->max_entropylen + 1; if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0), 0) || !uninstantiate(drbg)) goto err; /* Test explicit reseed with too little entropy */ if (!init(drbg, td, &t)) goto err; t.entropylen = drbg->min_entropylen - 1; if (!TEST_int_le(RAND_DRBG_reseed(drbg, td->adin, td->adinlen, 0), 0) || !uninstantiate(drbg)) goto err; /* Standard says we have to check uninstantiate really zeroes */ if (!TEST_mem_eq(zero, sizeof(drbg->data), &drbg->data, sizeof(drbg->data))) 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 (error_check(td)) goto err; rv = 1; err: return rv; } /* * Hook context data, attached as EXDATA to the RAND_DRBG */ typedef struct hook_ctx_st { RAND_DRBG *drbg; /* * Currently, all DRBGs use the same get_entropy() callback. * The tests however, don't assume this and store * the original callback for every DRBG separately. */ RAND_DRBG_get_entropy_fn get_entropy; /* forces a failure of the get_entropy() call if nonzero */ int fail; /* counts successful reseeds */ int reseed_count; } HOOK_CTX; static HOOK_CTX master_ctx, public_ctx, private_ctx; static HOOK_CTX *get_hook_ctx(RAND_DRBG *drbg) { return (HOOK_CTX *)RAND_DRBG_get_ex_data(drbg, app_data_index); } /* Intercepts and counts calls to the get_entropy() callback */ static size_t get_entropy_hook(RAND_DRBG *drbg, unsigned char **pout, int entropy, size_t min_len, size_t max_len, int prediction_resistance) { size_t ret; HOOK_CTX *ctx = get_hook_ctx(drbg); if (ctx->fail != 0) return 0; ret = ctx->get_entropy(drbg, pout, entropy, min_len, max_len, prediction_resistance); if (ret != 0) ctx->reseed_count++; return ret; } /* Installs a hook for the get_entropy() callback of the given drbg */ static void hook_drbg(RAND_DRBG *drbg, HOOK_CTX *ctx) { memset(ctx, 0, sizeof(*ctx)); ctx->drbg = drbg; ctx->get_entropy = drbg->get_entropy; drbg->get_entropy = get_entropy_hook; RAND_DRBG_set_ex_data(drbg, app_data_index, ctx); } /* Installs the hook for the get_entropy() callback of the given drbg */ static void unhook_drbg(RAND_DRBG *drbg) { HOOK_CTX *ctx = get_hook_ctx(drbg); drbg->get_entropy = ctx->get_entropy; CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DRBG, drbg, &drbg->ex_data); } /* Resets the given hook context */ static void reset_hook_ctx(HOOK_CTX *ctx) { ctx->fail = 0; ctx->reseed_count = 0; } /* Resets all drbg hook contexts */ static void reset_drbg_hook_ctx(void) { reset_hook_ctx(&master_ctx); reset_hook_ctx(&public_ctx); reset_hook_ctx(&private_ctx); } /* * 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()) * |master|, |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 */ static int test_drbg_reseed(int expect_success, RAND_DRBG *master, RAND_DRBG *public, RAND_DRBG *private, int expect_master_reseed, int expect_public_reseed, int expect_private_reseed ) { unsigned char buf[32]; time_t before_reseed, after_reseed; int expected_state = (expect_success ? DRBG_READY : DRBG_ERROR); /* * step 1: check preconditions */ /* Test whether seed propagation is enabled */ if (!TEST_int_ne(master->reseed_prop_counter, 0) || !TEST_int_ne(public->reseed_prop_counter, 0) || !TEST_int_ne(private->reseed_prop_counter, 0)) return 0; /* Check whether the master DRBG's reseed counter is the largest one */ if (!TEST_int_le(public->reseed_prop_counter, master->reseed_prop_counter) || !TEST_int_le(private->reseed_prop_counter, master->reseed_prop_counter)) return 0; /* * step 2: generate random output */ /* Generate random output from the public and private DRBG */ before_reseed = expect_master_reseed == 1 ? time(NULL) : 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(master->state, expected_state) || !TEST_int_eq(public->state, expected_state) || !TEST_int_eq(private->state, expected_state)) return 0; if (expect_master_reseed >= 0) { /* Test whether master DRBG was reseeded as expected */ if (!TEST_int_eq(master_ctx.reseed_count, expect_master_reseed)) return 0; } if (expect_public_reseed >= 0) { /* Test whether public DRBG was reseeded as expected */ if (!TEST_int_eq(public_ctx.reseed_count, expect_public_reseed)) return 0; } if (expect_private_reseed >= 0) { /* Test whether public DRBG was reseeded as expected */ if (!TEST_int_eq(private_ctx.reseed_count, expect_private_reseed)) return 0; } if (expect_success == 1) { /* Test whether all three reseed counters are synchronized */ if (!TEST_int_eq(public->reseed_prop_counter, master->reseed_prop_counter) || !TEST_int_eq(private->reseed_prop_counter, master->reseed_prop_counter)) return 0; /* Test whether reseed time of master DRBG is set correctly */ if (!TEST_time_t_le(before_reseed, master->reseed_time) || !TEST_time_t_le(master->reseed_time, after_reseed)) return 0; /* Test whether reseed times of child DRBGs are synchronized with master */ if (!TEST_time_t_ge(public->reseed_time, master->reseed_time) || !TEST_time_t_ge(private->reseed_time, master->reseed_time)) return 0; } else { ERR_clear_error(); } return 1; } /* * 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 *master, *public, *private; unsigned char rand_add_buf[256]; int rv=0; /* 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(master = 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 master */ if (!TEST_ptr_ne(public, private) || !TEST_ptr_ne(public, master) || !TEST_ptr_ne(private, master) || !TEST_ptr_eq(public->parent, master) || !TEST_ptr_eq(private->parent, master)) return 0; /* uninstantiate the three global DRBGs */ RAND_DRBG_uninstantiate(private); RAND_DRBG_uninstantiate(public); RAND_DRBG_uninstantiate(master); /* Install hooks for the following tests */ hook_drbg(master, &master_ctx); hook_drbg(public, &public_ctx); hook_drbg(private, &private_ctx); /* * Test initial seeding of shared DRBGs */ if (!TEST_true(test_drbg_reseed(1, master, public, private, 1, 1, 1))) goto error; reset_drbg_hook_ctx(); /* * Test initial state of shared DRBGs */ if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 0, 0))) goto error; reset_drbg_hook_ctx(); /* * Test whether the public and private DRBG are both reseeded when their * reseed counters differ from the master's reseed counter. */ master->reseed_prop_counter++; if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 1, 1))) goto error; reset_drbg_hook_ctx(); /* * Test whether the public DRBG is reseeded when its reseed counter differs * from the master's reseed counter. */ master->reseed_prop_counter++; private->reseed_prop_counter++; if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 1, 0))) goto error; reset_drbg_hook_ctx(); /* * Test whether the private DRBG is reseeded when its reseed counter differs * from the master's reseed counter. */ master->reseed_prop_counter++; public->reseed_prop_counter++; if (!TEST_true(test_drbg_reseed(1, master, public, private, 0, 0, 1))) goto error; reset_drbg_hook_ctx(); /* fill 'randomness' buffer with some arbitrary data */ memset(rand_add_buf, 'r', sizeof(rand_add_buf)); /* * Test whether all three DRBGs are reseeded by RAND_add() */ RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf)); if (!TEST_true(test_drbg_reseed(1, master, public, private, 1, 1, 1))) goto error; reset_drbg_hook_ctx(); /* * Test whether none of the DRBGs is reseed if the master fails to reseed */ master_ctx.fail = 1; master->reseed_prop_counter++; RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf)); if (!TEST_true(test_drbg_reseed(0, master, public, private, 0, 0, 0))) goto error; reset_drbg_hook_ctx(); rv = 1; error: /* Remove hooks */ unhook_drbg(master); unhook_drbg(public); unhook_drbg(private); 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, *private; public = RAND_DRBG_get0_public(); private = RAND_DRBG_get0_private(); RAND_DRBG_set_reseed_time_interval(public, 1); RAND_DRBG_set_reseed_time_interval(private, 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(); 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(); 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 #ifdef OPENSSL_RAND_SEED_NONE /* * Calculates the minimum buffer length which needs to be * provided to RAND_seed() in order to successfully * instantiate the DRBG. * * Copied from rand_drbg_seedlen() in rand_drbg.c */ static size_t rand_drbg_seedlen(RAND_DRBG *drbg) { /* * If no os entropy source is available then RAND_seed(buffer, bufsize) * is expected to succeed if and only if the buffer length satisfies * the following requirements, which follow from the calculations * in RAND_DRBG_instantiate(). */ size_t min_entropy = drbg->strength; size_t min_entropylen = drbg->min_entropylen; /* * Extra entropy for the random nonce in the absence of a * get_nonce callback, see comment in RAND_DRBG_instantiate(). */ if (drbg->min_noncelen > 0 && drbg->get_nonce == NULL) { min_entropy += drbg->strength / 2; min_entropylen += drbg->min_noncelen; } /* * Convert entropy requirement from bits to bytes * (dividing by 8 without rounding upwards, because * all entropy requirements are divisible by 8). */ min_entropy >>= 3; /* Return a value that satisfies both requirements */ return min_entropy > min_entropylen ? min_entropy : min_entropylen; } #endif /*OPENSSL_RAND_SEED_NONE*/ /* * Test that instantiation with RAND_seed() works as expected * * If no os entropy source is available then RAND_seed(buffer, bufsize) * is expected to succeed if and only if the buffer length is at least * rand_drbg_seedlen(master) bytes. * * If an os entropy source is available then RAND_seed(buffer, bufsize) * is expected to succeed always. */ static int test_rand_seed(void) { RAND_DRBG *master = RAND_DRBG_get0_master(); unsigned char rand_buf[256]; size_t rand_buflen; #ifdef OPENSSL_RAND_SEED_NONE size_t required_seed_buflen = rand_drbg_seedlen(master); #else size_t required_seed_buflen = 0; #endif memset(rand_buf, 0xCD, sizeof(rand_buf)); for ( rand_buflen = 256 ; rand_buflen > 0 ; --rand_buflen ) { RAND_DRBG_uninstantiate(master); RAND_seed(rand_buf, rand_buflen); if (!TEST_int_eq(RAND_status(), (rand_buflen >= required_seed_buflen))) return 0; } return 1; } /* * Test that adding additional data with RAND_add() works as expected * when the master DRBG is instantiated (and below its reseed limit). * * This should succeed regardless of whether an os entropy source is * available or not. */ static int test_rand_add(void) { unsigned char rand_buf[256]; size_t rand_buflen; memset(rand_buf, 0xCD, sizeof(rand_buf)); /* make sure it's instantiated */ RAND_seed(rand_buf, sizeof(rand_buf)); if (!TEST_true(RAND_status())) return 0; for ( rand_buflen = 256 ; rand_buflen > 0 ; --rand_buflen ) { RAND_add(rand_buf, rand_buflen, 0.0); if (!TEST_true(RAND_status())) return 0; } return 1; } static int test_multi_set(void) { int rv = 0; RAND_DRBG *drbg = NULL; /* init drbg with default CTR initializer */ if (!TEST_ptr(drbg = RAND_DRBG_new(0, 0, NULL))) 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 *master, *public, *private; master = RAND_DRBG_get0_master(); public = RAND_DRBG_get0_public(); private = RAND_DRBG_get0_private(); /* Check the default type and flags for master, public and private */ return TEST_int_eq(master->type, RAND_DRBG_TYPE) && TEST_int_eq(master->flags, RAND_DRBG_FLAGS | RAND_DRBG_FLAG_MASTER) && 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 master DRBG and check again */ && TEST_true(RAND_DRBG_set_defaults(NID_sha256, RAND_DRBG_FLAG_MASTER)) && TEST_true(RAND_DRBG_uninstantiate(master)) && TEST_int_eq(master->type, NID_sha256) && TEST_int_eq(master->flags, RAND_DRBG_FLAG_MASTER) && 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(master->type, NID_sha256) && TEST_int_eq(master->flags, RAND_DRBG_FLAG_MASTER) && 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(master->type, NID_sha256) && TEST_int_eq(master->flags, RAND_DRBG_FLAG_MASTER) && 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) /* Change DRBG defaults and change master and check again */ && TEST_true(RAND_DRBG_set_defaults(NID_aes_256_ctr, RAND_DRBG_FLAG_CTR_NO_DF)) && TEST_true(RAND_DRBG_uninstantiate(master)) && TEST_int_eq(master->type, NID_aes_256_ctr) && TEST_int_eq(master->flags, RAND_DRBG_FLAG_MASTER|RAND_DRBG_FLAG_CTR_NO_DF) /* Reset back to the standard defaults */ && TEST_true(RAND_DRBG_set_defaults(RAND_DRBG_TYPE, RAND_DRBG_FLAGS | RAND_DRBG_FLAG_MASTER | RAND_DRBG_FLAG_PUBLIC | RAND_DRBG_FLAG_PRIVATE)) && TEST_true(RAND_DRBG_uninstantiate(master)) && TEST_true(RAND_DRBG_uninstantiate(public)) && TEST_true(RAND_DRBG_uninstantiate(private)); } int setup_tests(void) { app_data_index = RAND_DRBG_get_ex_new_index(0L, NULL, NULL, NULL, NULL); ADD_ALL_TESTS(test_kats, OSSL_NELEM(drbg_test)); ADD_ALL_TESTS(test_error_checks, OSSL_NELEM(drbg_test)); ADD_TEST(test_rand_drbg_reseed); ADD_TEST(test_rand_seed); ADD_TEST(test_rand_add); ADD_TEST(test_multi_set); ADD_TEST(test_set_defaults); #if defined(OPENSSL_THREADS) ADD_TEST(test_multi_thread); #endif return 1; }