/*
 * Copyright 2021 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
 */

#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/bio.h>
#include <openssl/core_names.h>
#include "testutil.h"

static int test_rand(void)
{
    EVP_RAND_CTX *privctx;
    OSSL_PARAM params[2], *p = params;
    unsigned char entropy1[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05 };
    unsigned char entropy2[] = { 0xff, 0xfe, 0xfd };
    unsigned char outbuf[3];

    if (!TEST_ptr(privctx = RAND_get0_private(NULL)))
        return 0;

    *p++ = OSSL_PARAM_construct_octet_string(OSSL_RAND_PARAM_TEST_ENTROPY,
                                             entropy1, sizeof(entropy1));
    *p = OSSL_PARAM_construct_end();

    if (!TEST_ptr(privctx = RAND_get0_private(NULL))
            || !TEST_true(EVP_RAND_CTX_set_params(privctx, params))
            || !TEST_int_gt(RAND_priv_bytes(outbuf, sizeof(outbuf)), 0)
            || !TEST_mem_eq(outbuf, sizeof(outbuf), entropy1, sizeof(outbuf))
            || !TEST_int_le(RAND_priv_bytes(outbuf, sizeof(outbuf) + 1), 0)
            || !TEST_int_gt(RAND_priv_bytes(outbuf, sizeof(outbuf)), 0)
            || !TEST_mem_eq(outbuf, sizeof(outbuf),
                            entropy1 + sizeof(outbuf), sizeof(outbuf)))
        return 0;

    *params = OSSL_PARAM_construct_octet_string(OSSL_RAND_PARAM_TEST_ENTROPY,
                                                entropy2, sizeof(entropy2));
    if (!TEST_true(EVP_RAND_CTX_set_params(privctx, params))
            || !TEST_int_gt(RAND_priv_bytes(outbuf, sizeof(outbuf)), 0)
            || !TEST_mem_eq(outbuf, sizeof(outbuf), entropy2, sizeof(outbuf)))
        return 0;
    return 1;
}

int setup_tests(void)
{
    if (!TEST_true(RAND_set_DRBG_type(NULL, "TEST-RAND", NULL, NULL, NULL)))
        return 0;
    ADD_TEST(test_rand);
    return 1;
}