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openssl/test/drbgtest.c
Dr. Matthias St. Pierre 09e76c5dd3 test/drbgtest: improve the reseed after fork test 
Issue #12377 demonstrated that it is not sufficient to verify that
after a fork a reseeding is triggered in the child. This commit
enhances the test by collecting the output of the public and private
drbg for the parent and all children and checking for duplicates.
In case of duplicates, it prints an error message and displays a
sorted output.

The analysis of #12377 (see [1]) showed that due to an error in the
resetting of the AES-CTR (issue #12405, fixed by #12413), it could
happen that only the first n bytes (n=1,...15) of the children's
random output were identical.

This test is optimized to detect this issue by only comparing the first
byte of the sampled data (i.e., the first 'column' of the output).
The number of samples is chosen high enough to keep the chance of false
positives low. The test is executed sixteen times, each time advancing
the internal counter by requesting a single extra byte of random data.

Another, more general test splits the entire sampled random data into
two-byte chunks and counts their collisions. If a certain threshold
is exceeded, it reports an error.

[1] https://github.com/openssl/openssl/issues/12377#issuecomment-656207334

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12407)
2020-09-05 11:07:55 +02:00

912 lines
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/*
* 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 <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_local.h"
#include "../include/crypto/rand.h"
#include "../providers/implementations/rands/drbg_local.h"
#include "../crypto/evp/evp_local.h"
#if defined(_WIN32)
# include <windows.h>
#endif
#if defined(OPENSSL_SYS_UNIX)
# include <sys/types.h>
# include <sys/wait.h>
# include <unistd.h>
#endif
#include "testutil.h"
#include "drbgtest.h"
/*
* DRBG generate wrappers
*/
static int gen_bytes(EVP_RAND_CTX *drbg, unsigned char *buf, int num)
{
const RAND_METHOD *meth = RAND_get_rand_method();
if (meth != NULL && meth != RAND_OpenSSL()) {
if (meth->bytes != NULL)
return meth->bytes(buf, num);
return -1;
}
if (drbg != NULL)
return EVP_RAND_generate(drbg, buf, num, 0, 0, NULL, 0);
return 0;
}
static int rand_bytes(unsigned char *buf, int num)
{
return gen_bytes(RAND_get0_public(NULL), buf, num);
}
static int rand_priv_bytes(unsigned char *buf, int num)
{
return gen_bytes(RAND_get0_private(NULL), buf, num);
}
/* size of random output generated in test_drbg_reseed() */
#define RANDOM_SIZE 16
/*
* DRBG query functions
*/
static int state(EVP_RAND_CTX *drbg)
{
return EVP_RAND_state(drbg);
}
static unsigned int query_rand_uint(EVP_RAND_CTX *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, params))
return n;
return 0;
}
#define DRBG_UINT(name) \
static unsigned int name(EVP_RAND_CTX *drbg) \
{ \
return query_rand_uint(drbg, #name); \
}
DRBG_UINT(reseed_counter)
static PROV_DRBG *prov_rand(EVP_RAND_CTX *drbg)
{
return (PROV_DRBG *)drbg->data;
}
static void set_reseed_counter(EVP_RAND_CTX *drbg, unsigned int n)
{
PROV_DRBG *p = prov_rand(drbg);
p->reseed_counter = n;
}
static void inc_reseed_counter(EVP_RAND_CTX *drbg)
{
set_reseed_counter(drbg, reseed_counter(drbg) + 1);
}
static time_t reseed_time(EVP_RAND_CTX *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, params))
return t;
return 0;
}
/*
* 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(EVP_RAND_CTX *drbg)
{
return 1;
}
/*
* 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
* |public_random|, |private_random|: generated random output
* |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_when|: if nonzero, used instead of time(NULL) to set the
* |before_reseed| time.
*/
static int test_drbg_reseed(int expect_success,
EVP_RAND_CTX *primary,
EVP_RAND_CTX *public,
EVP_RAND_CTX *private,
unsigned char *public_random,
unsigned char *private_random,
int expect_primary_reseed,
int expect_public_reseed,
int expect_private_reseed,
time_t reseed_when
)
{
time_t before_reseed, after_reseed;
int expected_state = (expect_success ? DRBG_READY : DRBG_ERROR);
unsigned int primary_reseed, public_reseed, private_reseed;
unsigned char dummy[RANDOM_SIZE];
if (public_random == NULL)
public_random = dummy;
if (private_random == NULL)
private_random = dummy;
/*
* 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((unsigned char*)public_random,
RANDOM_SIZE), expect_success)
|| !TEST_int_eq(rand_priv_bytes((unsigned char*) private_random,
RANDOM_SIZE), 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)
/* number of children to fork */
#define DRBG_FORK_COUNT 9
/* two results per child, two for the parent */
#define DRBG_FORK_RESULT_COUNT (2 * (DRBG_FORK_COUNT + 1))
typedef struct drbg_fork_result_st {
unsigned char random[RANDOM_SIZE]; /* random output */
int pindex; /* process index (0: parent, 1,2,3...: children)*/
pid_t pid; /* process id */
int private; /* true if the private drbg was used */
char name[10]; /* 'parent' resp. 'child 1', 'child 2', ... */
} drbg_fork_result;
/*
* Sort the drbg_fork_result entries in lexicographical order
*
* This simplifies finding duplicate random output and makes
* the printout in case of an error more readable.
*/
static int compare_drbg_fork_result(const void * left, const void * right)
{
int result;
const drbg_fork_result *l = left;
const drbg_fork_result *r = right;
/* separate public and private results */
result = l->private - r->private;
if (result == 0)
result = memcmp(l->random, r->random, RANDOM_SIZE);
if (result == 0)
result = l->pindex - r->pindex;
return result;
}
/*
* Sort two-byte chunks of random data
*
* Used for finding collisions in two-byte chunks
*/
static int compare_rand_chunk(const void * left, const void * right)
{
return memcmp(left, right, 2);
}
/*
* Test whether primary, public and private DRBG are reseeded
* in the child after forking the process. Collect the random
* output of the public and private DRBG and send it back to
* the parent process.
*/
static int test_drbg_reseed_in_child(EVP_RAND_CTX *primary,
EVP_RAND_CTX *public,
EVP_RAND_CTX *private,
drbg_fork_result result[2])
{
int rv = 0, status;
int fd[2];
pid_t pid;
unsigned char random[2 * RANDOM_SIZE];
if (!TEST_int_ge(pipe(fd), 0))
return 0;
if (!TEST_int_ge(pid = fork(), 0)) {
close(fd[0]);
close(fd[1]);
return 0;
} else if (pid > 0) {
/* I'm the parent; close the write end */
close(fd[1]);
/* wait for children to terminate and collect their random output */
if (TEST_int_eq(waitpid(pid, &status, 0), pid)
&& TEST_int_eq(status, 0)
&& TEST_true(read(fd[0], &random[0], sizeof(random))
== sizeof(random))) {
/* random output of public drbg */
result[0].pid = pid;
result[0].private = 0;
memcpy(result[0].random, &random[0], RANDOM_SIZE);
/* random output of private drbg */
result[1].pid = pid;
result[1].private = 1;
memcpy(result[1].random, &random[RANDOM_SIZE], RANDOM_SIZE);
rv = 1;
}
/* close the read end */
close(fd[0]);
return rv;
} else {
/* I'm the child; close the read end */
close(fd[0]);
/* check whether all three DRBGs reseed and send output to parent */
if (TEST_true(test_drbg_reseed(1, primary, public, private,
&random[0], &random[RANDOM_SIZE],
1, 1, 1, 0))
&& TEST_true(write(fd[1], random, sizeof(random))
== sizeof(random))) {
rv = 1;
}
/* close the write end */
close(fd[1]);
/* convert boolean to exit code */
exit(rv == 0);
}
}
static int test_rand_reseed_on_fork(EVP_RAND_CTX *primary,
EVP_RAND_CTX *public,
EVP_RAND_CTX *private)
{
unsigned int i;
pid_t pid = getpid();
int verbose = (getenv("V") != NULL);
int success = 1;
int duplicate[2] = {0, 0};
unsigned char random[2 * RANDOM_SIZE];
unsigned char sample[DRBG_FORK_RESULT_COUNT * RANDOM_SIZE];
unsigned char *psample = &sample[0];
drbg_fork_result result[DRBG_FORK_RESULT_COUNT];
drbg_fork_result *presult = &result[2];
memset(&result, 0, sizeof(result));
for (i = 1 ; i <= DRBG_FORK_COUNT ; ++i) {
presult[0].pindex = presult[1].pindex = i;
sprintf(presult[0].name, "child %d", i);
strcpy(presult[1].name, presult[0].name);
/* collect the random output of the children */
if (!TEST_true(test_drbg_reseed_in_child(primary,
public,
private,
presult)))
return 0;
presult += 2;
}
/* collect the random output of the parent */
if (!TEST_true(test_drbg_reseed(1,
primary, public, private,
&random[0], &random[RANDOM_SIZE],
0, 0, 0, 0)))
return 0;
strcpy(result[0].name, "parent");
strcpy(result[1].name, "parent");
/* output of public drbg */
result[0].pid = pid;
result[0].private = 0;
memcpy(result[0].random, &random[0], RANDOM_SIZE);
/* output of private drbg */
result[1].pid = pid;
result[1].private = 1;
memcpy(result[1].random, &random[RANDOM_SIZE], RANDOM_SIZE);
/* collect all sampled random data in a single buffer */
for (i = 0 ; i < DRBG_FORK_RESULT_COUNT ; ++i) {
memcpy(psample, &result[i].random[0], RANDOM_SIZE);
psample += RANDOM_SIZE;
}
/* sort the results... */
qsort(result, DRBG_FORK_RESULT_COUNT, sizeof(drbg_fork_result),
compare_drbg_fork_result);
/* ...and count duplicate prefixes by looking at the first byte only */
for (i = 1 ; i < DRBG_FORK_RESULT_COUNT ; ++i) {
if (result[i].random[0] == result[i-1].random[0]) {
/* count public and private duplicates separately */
++duplicate[result[i].private];
}
}
if (duplicate[0] >= DRBG_FORK_COUNT - 1) {
/* just too many duplicates to be a coincidence */
TEST_note("ERROR: %d duplicate prefixes in public random output", duplicate[0]);
success = 0;
}
if (duplicate[1] >= DRBG_FORK_COUNT - 1) {
/* just too many duplicates to be a coincidence */
TEST_note("ERROR: %d duplicate prefixes in private random output", duplicate[1]);
success = 0;
}
duplicate[0] = 0;
/* sort the two-byte chunks... */
qsort(sample, sizeof(sample)/2, 2, compare_rand_chunk);
/* ...and count duplicate chunks */
for (i = 2, psample = sample + 2 ; i < sizeof(sample) ; i += 2, psample += 2) {
if (compare_rand_chunk(psample - 2, psample) == 0)
++duplicate[0];
}
if (duplicate[0] >= DRBG_FORK_COUNT - 1) {
/* just too many duplicates to be a coincidence */
TEST_note("ERROR: %d duplicate chunks in random output", duplicate[0]);
success = 0;
}
if (verbose || !success) {
for (i = 0 ; i < DRBG_FORK_RESULT_COUNT ; ++i) {
char *rand_hex = OPENSSL_buf2hexstr(result[i].random, RANDOM_SIZE);
TEST_note(" random: %s, pid: %d (%s, %s)",
rand_hex,
result[i].pid,
result[i].name,
result[i].private ? "private" : "public"
);
OPENSSL_free(rand_hex);
}
}
return success;
}
static int test_rand_fork_safety(int i)
{
int success = 1;
unsigned char random[1];
EVP_RAND_CTX *primary, *public, *private;
/* All three DRBGs should be non-null */
if (!TEST_ptr(primary = RAND_get0_primary(NULL))
|| !TEST_ptr(public = RAND_get0_public(NULL))
|| !TEST_ptr(private = RAND_get0_private(NULL)))
return 0;
/* run the actual test */
if (!TEST_true(test_rand_reseed_on_fork(primary, public, private)))
success = 0;
/* request a single byte from each of the DRBGs before the next run */
if (!TEST_true(RAND_bytes(random, 1) && RAND_priv_bytes(random, 1)))
success = 0;
return success;
}
#endif
/*
* Test whether the default rand_method (RAND_OpenSSL()) is
* setup correctly, in particular whether reseeding works
* as designed.
*/
static int test_rand_reseed(void)
{
EVP_RAND_CTX *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_get0_primary(NULL))
|| !TEST_ptr(public = RAND_get0_public(NULL))
|| !TEST_ptr(private = RAND_get0_private(NULL)))
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(prov_rand(public)->parent, prov_rand(primary))
|| !TEST_ptr_eq(prov_rand(private)->parent, prov_rand(primary)))
return 0;
/* Disable CRNG testing for the primary DRBG */
if (!TEST_true(disable_crngt(primary)))
return 0;
/* uninstantiate the three global DRBGs */
EVP_RAND_uninstantiate(primary);
EVP_RAND_uninstantiate(private);
EVP_RAND_uninstantiate(public);
/*
* Test initial seeding of shared DRBGs
*/
if (!TEST_true(test_drbg_reseed(1,
primary, public, private,
NULL, NULL,
1, 1, 1, 0)))
goto error;
/*
* Test initial state of shared DRBGs
*/
if (!TEST_true(test_drbg_reseed(1,
primary, public, private,
NULL, NULL,
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,
NULL, NULL,
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,
NULL, NULL,
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,
NULL, NULL,
0, 0, 1, 0)))
goto error;
/* 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,
NULL, NULL,
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,
NULL, NULL,
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 int set_reseed_time_interval(EVP_RAND_CTX *drbg, int t)
{
OSSL_PARAM params[2];
params[0] = OSSL_PARAM_construct_int(OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL,
&t);
params[1] = OSSL_PARAM_construct_end();
return EVP_RAND_set_ctx_params(drbg, params);
}
static void run_multi_thread_test(void)
{
unsigned char buf[256];
time_t start = time(NULL);
EVP_RAND_CTX *public = NULL, *private = NULL;
if (!TEST_ptr(public = RAND_get0_public(NULL))
|| !TEST_ptr(private = RAND_get0_private(NULL))
|| !TEST_true(set_reseed_time_interval(private, 1))
|| !TEST_true(set_reseed_time_interval(public, 1))) {
multi_thread_rand_bytes_succeeded = 0;
return;
}
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 EVP_RAND_CTX *new_drbg(EVP_RAND_CTX *parent)
{
OSSL_PARAM params[2];
EVP_RAND *rand = NULL;
EVP_RAND_CTX *drbg = NULL;
params[0] = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_CIPHER,
"AES-256-CTR", 0);
params[1] = OSSL_PARAM_construct_end();
if (!TEST_ptr(rand = EVP_RAND_fetch(NULL, "CTR-DRBG", NULL))
|| !TEST_ptr(drbg = EVP_RAND_CTX_new(rand, parent))
|| !TEST_true(EVP_RAND_set_ctx_params(drbg, params))) {
EVP_RAND_CTX_free(drbg);
drbg = NULL;
}
EVP_RAND_free(rand);
return drbg;
}
static int test_rand_prediction_resistance(void)
{
EVP_RAND_CTX *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 = new_drbg(NULL))
|| !TEST_true(disable_crngt(x))
|| !TEST_true(EVP_RAND_instantiate(x, 0, 0, NULL, 0))
|| !TEST_ptr(y = new_drbg(x))
|| !TEST_true(EVP_RAND_instantiate(y, 0, 0, NULL, 0))
|| !TEST_ptr(z = new_drbg(y))
|| !TEST_true(EVP_RAND_instantiate(z, 0, 0, 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(EVP_RAND_reseed(z, 0, NULL, 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 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(EVP_RAND_reseed(z, 1, NULL, 0, NULL, 0))
|| !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(EVP_RAND_generate(z, buf1, sizeof(buf1), 0, 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(EVP_RAND_generate(z, buf2, sizeof(buf2), 0, 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(EVP_RAND_reseed(z, 0, NULL, 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;
ret = 1;
err:
EVP_RAND_CTX_free(z);
EVP_RAND_CTX_free(y);
EVP_RAND_CTX_free(x);
return ret;
}
int setup_tests(void)
{
ADD_TEST(test_rand_reseed);
#if defined(OPENSSL_SYS_UNIX)
ADD_ALL_TESTS(test_rand_fork_safety, RANDOM_SIZE);
#endif
ADD_TEST(test_rand_prediction_resistance);
#if defined(OPENSSL_THREADS)
ADD_TEST(test_multi_thread);
#endif
return 1;
}
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