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openssl/test/drbgtest.c
Dr. Matthias St. Pierre 8164d91d18 DRBG: make the derivation function the default for ctr_drbg 
The NIST standard presents two alternative ways for seeding the
CTR DRBG, depending on whether a derivation function is used or not.
In Section 10.2.1 of NIST SP800-90Ar1 the following is assessed:

  The use of the derivation function is optional if either an
  approved RBG or an entropy source provides full entropy output
  when entropy input is requested by the DRBG mechanism.
  Otherwise, the derivation function shall be used.

Since the OpenSSL DRBG supports being reseeded from low entropy random
sources (using RAND_POOL), the use of a derivation function is mandatory.
For that reason we change the default and replace the opt-in flag
RAND_DRBG_FLAG_CTR_USE_DF with an opt-out flag RAND_DRBG_FLAG_CTR_NO_DF.
This change simplifies the RAND_DRBG_new() calls.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5294)
2018-02-13 17:32:54 +01:00

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/*
* 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 <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 "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)
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),
};
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)
{
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)
|| !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 generate_counter_tmp;
int ret = 0;
if (!TEST_ptr(drbg = RAND_DRBG_new(0, 0, 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 detecion: 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;
generate_counter_tmp = drbg->generate_counter;
drbg->generate_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->generate_counter, generate_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;
generate_counter_tmp = drbg->generate_counter;
drbg->generate_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->generate_counter, generate_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)
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)
|| !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)
|| !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)
|| !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)
{
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);
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()
{
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_counter, 0)
|| !TEST_int_ne(public->reseed_counter, 0)
|| !TEST_int_ne(private->reseed_counter, 0))
return 0;
/* Check whether the master DRBG's reseed counter is the largest one */
if (!TEST_int_le(public->reseed_counter, master->reseed_counter)
|| !TEST_int_le(private->reseed_counter, master->reseed_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_counter, master->reseed_counter)
|| !TEST_int_eq(private->reseed_counter, master->reseed_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_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;
/* Install hooks for the following tests */
hook_drbg(master, &master_ctx);
hook_drbg(public, &public_ctx);
hook_drbg(private, &private_ctx);
/*
* Test initial state of shared DRBs
*/
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_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_counter++;
private->reseed_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_counter++;
public->reseed_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_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;
}
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_reseed);
return 1;
}
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