/*

 * Copyright 2011-2019 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_local.h"

#include "../include/crypto/rand.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"

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;

}

 /*

 * 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(0, 0, NULL))

	|| !TEST_true(disable_crngt(drbg)))

        goto err;

    /*

     * Personalisation string tests

     */

    /* Test detection of too large personalisation 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;

}

#if defined(OPENSSL_SYS_UNIX)

/*

 * Test whether master, public and private DRBG are reseeded after

 * forking the process.

 */

static int test_drbg_reseed_after_fork(RAND_DRBG *master,

                                       RAND_DRBG *public,

                                       RAND_DRBG *private)

{

    pid_t pid;

    int status=0;

    pid = fork();

    if (!TEST_int_ge(pid, 0))

        return 0;

    if (pid > 0) {

        /* I'm the parent; wait for the child and check its exit code */

        return TEST_int_eq(waitpid(pid, &status, 0), pid) && TEST_int_eq(status, 0);

    }

    /* I'm the child; check whether all three DRBGs reseed. */

    if (!TEST_true(test_drbg_reseed(1, master, public, private, 1, 1, 1, 0)))

        status = 1;

    /* Remove hooks  */

    unhook_drbg(master);

    unhook_drbg(public);

    unhook_drbg(private);

    exit(status);

}

#endif

/*

 * 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();

#if defined(OPENSSL_SYS_UNIX)

    if (!TEST_true(test_drbg_reseed_after_fork(master, public, private)))

        goto error;

#endif

    /* 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)

{