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openssl/test/drbgtest.c
Pauli d69226a3fc Add the FIPS related continuous random number generator (CRNG) testing. 
Refer to FIPS 140-2 section 4.9.2 Conditional Tests for details.

The check is fairly simplistic, being for the entropy sources to not feed
the DRBG the same block of seed material twice in a row.  Only the first
DRBG in a chain is subject to this check, latter DRBGs are assumed to be
safely seeded via the earlier DRBGs.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8599)
2019-03-29 17:50:48 +10:00

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/*
* Copyright 2011-2018 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
*/
#include <string.h>
#include "internal/nelem.h"
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/obj_mac.h>
#include <openssl/evp.h>
#include <openssl/aes.h>
#include "../crypto/rand/rand_lcl.h"
#include "../crypto/include/internal/rand_int.h"
#if defined(_WIN32)
# include <windows.h>
#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;
}
/*
* Disable CRNG testing if it is enabled.
* If the DRBG is ready or in an error state, this means an instantiate cycle
* for which the default personalisation string is used.
*/
static int disable_crngt(RAND_DRBG *drbg)
{
static const char pers[] = DRBG_DEFAULT_PERS_STRING;
const int instantiate = drbg->state != DRBG_UNINITIALISED;
if (drbg->get_entropy != rand_crngt_get_entropy)
return 1;
if ((instantiate && !RAND_DRBG_uninstantiate(drbg))
|| !TEST_true(RAND_DRBG_set_callbacks(drbg, &rand_drbg_get_entropy,
&rand_drbg_cleanup_entropy,
&rand_drbg_get_nonce,
&rand_drbg_cleanup_nonce))
|| (instantiate
&& !RAND_DRBG_instantiate(drbg, (const unsigned char *)pers,
sizeof(pers) - 1)))
return 0;
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];
/*
* 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(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;
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))
|| !TEST_true(disable_crngt(drbg)))
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 (!instantiate(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 (!instantiate(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 (!instantiate(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
* |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 *master,
RAND_DRBG *public,
RAND_DRBG *private,
int expect_master_reseed,
int expect_public_reseed,
int expect_private_reseed,
time_t reseed_time
)
{
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
*/
if (reseed_time == 0)
reseed_time = time(NULL);
/* Generate random output from the public and private DRBG */
before_reseed = expect_master_reseed == 1 ? reseed_time : 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;
time_t before_reseed;
/* 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;
/* Disable CRNG testing for the master DRBG */
if (!TEST_true(disable_crngt(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, 0)))
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, 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, 0)))
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, 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, 0)))
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().
* The before_reseed time has to be measured here and passed into the
* test_drbg_reseed() test, because the master DRBG gets already reseeded
* in RAND_add(), whence the check for the condition
* before_reseed <= master->reseed_time 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, master, public, private, 1, 1, 1,
before_reseed)))
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, 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 = 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
/*
* 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 = NULL;
unsigned char rand_buf[256];
size_t rand_buflen;
size_t required_seed_buflen = 0;
if (!TEST_ptr(master = RAND_DRBG_get0_master())
|| !TEST_true(disable_crngt(master)))
return 0;
#ifdef OPENSSL_RAND_SEED_NONE
required_seed_buflen = rand_drbg_seedlen(master);
#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))
|| !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 *master = NULL, *public = NULL, *private = NULL;
/* Check the default type and flags for master, public and private */
return TEST_ptr(master = RAND_DRBG_get0_master())
&& TEST_ptr(public = RAND_DRBG_get0_public())
&& TEST_ptr(private = RAND_DRBG_get0_private())
&& 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));
}
/*
* 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(unsigned char *buf)
{
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 1;
}
static int test_crngt(int n)
{
const struct s_drgb_types *dt = drgb_types + n / crngt_num_cases;
RAND_DRBG *drbg = NULL;
unsigned char buff[100];
size_t ent;
int res = 0;
int expect;
if (!TEST_true(rand_crngt_single_init()))
return 0;
rand_crngt_cleanup();
if (!TEST_ptr(drbg = RAND_DRBG_new(dt->nid, dt->flags, NULL)))
return 0;
ent = (drbg->min_entropylen + CRNGT_BUFSIZ - 1) / CRNGT_BUFSIZ;
crngt_case = n % crngt_num_cases;
crngt_idx = 0;
crngt_get_entropy = &crngt_entropy_cb;
if (!TEST_true(rand_crngt_init()))
goto err;
#ifndef FIPS_MODE
if (!TEST_true(RAND_DRBG_set_callbacks(drbg, &rand_crngt_get_entropy,
&rand_crngt_cleanup_entropy,
&rand_drbg_get_nonce,
&rand_drbg_cleanup_nonce)))
goto err;
#endif
expect = crngt_case == 0 || crngt_case > ent;
if (!TEST_int_eq(RAND_DRBG_instantiate(drbg, NULL, 0), expect))
goto err;
if (!expect)
goto fin;
if (!TEST_true(RAND_DRBG_generate(drbg, buff, sizeof(buff), 0, NULL, 0)))
goto err;
expect = crngt_case == 0 || crngt_case > 2 * ent;
if (!TEST_int_eq(RAND_DRBG_reseed(drbg, NULL, 0, 0), expect))
goto err;
if (!expect)
goto fin;
if (!TEST_true(RAND_DRBG_generate(drbg, buff, sizeof(buff), 0, NULL, 0)))
goto err;
fin:
res = 1;
err:
if (!res)
TEST_note("DRBG %zd case %zd block %zd", n / crngt_num_cases,
crngt_case, crngt_idx);
uninstantiate(drbg);
RAND_DRBG_free(drbg);
crngt_get_entropy = &rand_crngt_get_entropy_cb;
return res;
}
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
ADD_ALL_TESTS(test_crngt, crngt_num_cases * OSSL_NELEM(drgb_types));
return 1;
}
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