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