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/*
* Copyright 2016-2021 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
*/
/*
* Licensed under the Apache License 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* https://www.openssl.org/source/license.html
* or in the file LICENSE in the source distribution.
*/
#ifndef OSSL_CRYPTO_RAND_H
# define OSSL_CRYPTO_RAND_H
# pragma once
# include <openssl/rand.h>
# include "crypto/rand_pool.h"
/*
* Defines related to seed sources
*/
#ifndef DEVRANDOM
/*
* set this to a comma-separated list of 'random' device files to try out. By
* default, we will try to read at least one of these files
*/
# define DEVRANDOM "/dev/urandom", "/dev/random", "/dev/hwrng", "/dev/srandom"
# if defined(__linux) && !defined(__ANDROID__)
# ifndef DEVRANDOM_WAIT
# define DEVRANDOM_WAIT "/dev/random"
# endif
/*
* Linux kernels 4.8 and later changes how their random device works and there
* is no reliable way to tell that /dev/urandom has been seeded -- getentropy(2)
* should be used instead.
*/
# ifndef DEVRANDOM_SAFE_KERNEL
# define DEVRANDOM_SAFE_KERNEL 4, 8
# endif
/*
* Some operating systems do not permit select(2) on their random devices,
* defining this to zero will force the use of read(2) to extract one byte
* from /dev/random.
*/
# ifndef DEVRANDM_WAIT_USE_SELECT
# define DEVRANDM_WAIT_USE_SELECT 1
# endif
/*
* Define the shared memory identifier used to indicate if the operating
* system has properly seeded the DEVRANDOM source.
*/
# ifndef OPENSSL_RAND_SEED_DEVRANDOM_SHM_ID
# define OPENSSL_RAND_SEED_DEVRANDOM_SHM_ID 114
# endif
# endif
#endif
#if !defined(OPENSSL_NO_EGD) && !defined(DEVRANDOM_EGD)
/*
* set this to a comma-separated list of 'egd' sockets to try out. These
* sockets will be tried in the order listed in case accessing the device
* files listed in DEVRANDOM did not return enough randomness.
*/
# define DEVRANDOM_EGD "/var/run/egd-pool", "/dev/egd-pool", "/etc/egd-pool", "/etc/entropy"
#endif
void rand_cleanup_int(void);
/*
* Initialise the random pool reseeding sources.
*
* Returns 1 on success and 0 on failure.
*/
int rand_pool_init(void);
/*
* Finalise the random pool reseeding sources.
*/
void rand_pool_cleanup(void);
/*
* Control the random pool use of open file descriptors.
*/
void rand_pool_keep_random_devices_open(int keep);
/*
* Configuration
*/
void ossl_random_add_conf_module(void);
/*
* Get and cleanup random seed material.
*/
size_t ossl_rand_get_entropy(ossl_unused OSSL_CORE_HANDLE *handle,
unsigned char **pout, int entropy,
size_t min_len, size_t max_len);
void ossl_rand_cleanup_entropy(ossl_unused OSSL_CORE_HANDLE *handle,
unsigned char *buf, size_t len);
size_t ossl_rand_get_nonce(ossl_unused OSSL_CORE_HANDLE *handle,
unsigned char **pout, size_t min_len, size_t max_len,
const void *salt, size_t salt_len);
void ossl_rand_cleanup_nonce(ossl_unused OSSL_CORE_HANDLE *handle,
unsigned char *buf, size_t len);
/*
* Get seeding material from the operating system sources.
*/
size_t ossl_pool_acquire_entropy(RAND_POOL *pool);
int ossl_pool_add_nonce_data(RAND_POOL *pool);
#endif
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