static int test_rand_drbg_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_prop_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_prop_counter++;
    private->reseed_prop_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_prop_counter++;
    public->reseed_prop_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_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)))
        goto error;
    reset_drbg_hook_ctx();

    rv = 1;

error:
    /* Remove hooks  */
    unhook_drbg(master);
    unhook_drbg(public);
    unhook_drbg(private);

    return rv;
}