mirror of
https://github.com/openssl/openssl.git
synced 2024-12-03 05:41:46 +08:00
3cb7c5cfef
Reviewed-by: Rich Salz <rsalz@openssl.org> GH: #6208
952 lines
28 KiB
C
952 lines
28 KiB
C
/*
|
|
* 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 "../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)
|
|
|
|
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,
|
|
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 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) > 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_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;
|
|
|
|
/* 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_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;
|
|
}
|
|
|
|
#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
|
|
|
|
/*
|
|
* This function only returns the entropy already added with RAND_add(),
|
|
* and does not get entropy from the OS.
|
|
*
|
|
* Returns 0 on failure and the size of the buffer on success.
|
|
*/
|
|
static size_t get_pool_entropy(RAND_DRBG *drbg,
|
|
unsigned char **pout,
|
|
int entropy, size_t min_len, size_t max_len,
|
|
int prediction_resistance)
|
|
{
|
|
if (drbg->pool == NULL)
|
|
return 0;
|
|
|
|
if (drbg->pool->entropy < (size_t)entropy || drbg->pool->len < min_len
|
|
|| drbg->pool->len > max_len)
|
|
return 0;
|
|
|
|
*pout = drbg->pool->buffer;
|
|
return drbg->pool->len;
|
|
}
|
|
|
|
/*
|
|
* Clean up the entropy that get_pool_entropy() returned.
|
|
*/
|
|
static void cleanup_pool_entropy(RAND_DRBG *drbg, unsigned char *out, size_t outlen)
|
|
{
|
|
OPENSSL_secure_clear_free(drbg->pool->buffer, drbg->pool->max_len);
|
|
OPENSSL_free(drbg->pool);
|
|
drbg->pool = NULL;
|
|
}
|
|
|
|
/*
|
|
* Test that instantiating works when OS entropy is not available and that
|
|
* RAND_add() is enough to reseed it.
|
|
*/
|
|
static int test_rand_add(void)
|
|
{
|
|
RAND_DRBG *master = RAND_DRBG_get0_master();
|
|
RAND_DRBG_get_entropy_fn old_get_entropy = master->get_entropy;
|
|
RAND_DRBG_cleanup_entropy_fn old_cleanup_entropy = master->cleanup_entropy;
|
|
int rv = 0;
|
|
unsigned char rand_add_buf[256];
|
|
|
|
master->get_entropy = get_pool_entropy;
|
|
master->cleanup_entropy = cleanup_pool_entropy;
|
|
master->reseed_counter++;
|
|
RAND_DRBG_uninstantiate(master);
|
|
memset(rand_add_buf, 0xCD, sizeof(rand_add_buf));
|
|
RAND_add(rand_add_buf, sizeof(rand_add_buf), sizeof(rand_add_buf));
|
|
if (!TEST_true(RAND_DRBG_instantiate(master, NULL, 0)))
|
|
goto error;
|
|
|
|
rv = 1;
|
|
|
|
error:
|
|
master->get_entropy = old_get_entropy;
|
|
master->cleanup_entropy = old_cleanup_entropy;
|
|
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);
|
|
ADD_TEST(test_rand_add);
|
|
#if defined(OPENSSL_THREADS)
|
|
ADD_TEST(test_multi_thread);
|
|
#endif
|
|
return 1;
|
|
}
|