/*
 * Copyright 1995-2021 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
 */

#ifndef OPENSSL_RAND_H
#define OPENSSL_RAND_H
#pragma once

#include <openssl/macros.h>
#ifndef OPENSSL_NO_DEPRECATED_3_0
#define HEADER_RAND_H
#endif

#include <stdlib.h>
#include <openssl/types.h>
#include <openssl/e_os2.h>
#include <openssl/randerr.h>
#include <openssl/evp.h>

#ifdef __cplusplus
extern "C"
{
#endif

/*
 * Default security strength (in the sense of [NIST SP 800-90Ar1])
 *
 * NIST SP 800-90Ar1 supports the strength of the DRBG being smaller than that
 * of the cipher by collecting less entropy. The current DRBG implementation
 * does not take RAND_DRBG_STRENGTH into account and sets the strength of the
 * DRBG to that of the cipher.
 */
#define RAND_DRBG_STRENGTH 256

#ifndef OPENSSL_NO_DEPRECATED_3_0
    struct rand_meth_st
    {
        int (*seed)(const void* buf, int num);
        int (*bytes)(unsigned char* buf, int num);
        void (*cleanup)(void);
        int (*add)(const void* buf, int num, double randomness);
        int (*pseudorand)(unsigned char* buf, int num);
        int (*status)(void);
    };

    OSSL_DEPRECATEDIN_3_0 int RAND_set_rand_method(const RAND_METHOD* meth);
    OSSL_DEPRECATEDIN_3_0 const RAND_METHOD* RAND_get_rand_method(void);
#ifndef OPENSSL_NO_ENGINE
    OSSL_DEPRECATEDIN_3_0 int RAND_set_rand_engine(ENGINE* engine);
#endif

    OSSL_DEPRECATEDIN_3_0 RAND_METHOD* RAND_OpenSSL(void);
#endif /* OPENSSL_NO_DEPRECATED_3_0 */

#ifndef OPENSSL_NO_DEPRECATED_1_1_0
#define RAND_cleanup() \
    while (0)          \
    continue
#endif
    int RAND_bytes(unsigned char* buf, int num);
    int RAND_priv_bytes(unsigned char* buf, int num);

    /*
     * Equivalent of RAND_priv_bytes() but additionally taking an OSSL_LIB_CTX and
     * a strength.
     */
    int RAND_priv_bytes_ex(OSSL_LIB_CTX* ctx, unsigned char* buf, size_t num, unsigned int strength);

    /*
     * Equivalent of RAND_bytes() but additionally taking an OSSL_LIB_CTX and
     * a strength.
     */
    int RAND_bytes_ex(OSSL_LIB_CTX* ctx, unsigned char* buf, size_t num, unsigned int strength);

#ifndef OPENSSL_NO_DEPRECATED_1_1_0
    OSSL_DEPRECATEDIN_1_1_0 int RAND_pseudo_bytes(unsigned char* buf, int num);
#endif

    EVP_RAND_CTX* RAND_get0_primary(OSSL_LIB_CTX* ctx);
    EVP_RAND_CTX* RAND_get0_public(OSSL_LIB_CTX* ctx);
    EVP_RAND_CTX* RAND_get0_private(OSSL_LIB_CTX* ctx);

    int RAND_set_DRBG_type(OSSL_LIB_CTX* ctx, const char* drbg, const char* propq, const char* cipher, const char* digest);
    int RAND_set_seed_source_type(OSSL_LIB_CTX* ctx, const char* seed, const char* propq);

    void RAND_seed(const void* buf, int num);
    void RAND_keep_random_devices_open(int keep);

#if defined(__ANDROID__) && defined(__NDK_FPABI__)
    __NDK_FPABI__ /* __attribute__((pcs("aapcs"))) on ARM */
#endif
        void
        RAND_add(const void* buf, int num, double randomness);
    int RAND_load_file(const char* file, long max_bytes);
    int RAND_write_file(const char* file);
    const char* RAND_file_name(char* file, size_t num);
    int RAND_status(void);

#ifndef OPENSSL_NO_EGD
    int RAND_query_egd_bytes(const char* path, unsigned char* buf, int bytes);
    int RAND_egd(const char* path);
    int RAND_egd_bytes(const char* path, int bytes);
#endif

    int RAND_poll(void);

#if defined(_WIN32) && (defined(BASETYPES) || defined(_WINDEF_H))
/* application has to include <windows.h> in order to use these */
#ifndef OPENSSL_NO_DEPRECATED_1_1_0
    OSSL_DEPRECATEDIN_1_1_0 void RAND_screen(void);
    OSSL_DEPRECATEDIN_1_1_0 int RAND_event(UINT, WPARAM, LPARAM);
#endif
#endif

#ifdef __cplusplus
}
#endif

#endif