mirror of
https://github.com/openssl/openssl.git
synced 2024-12-15 06:01:37 +08:00
e4468e6d8d
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/12226)
308 lines
7.7 KiB
C
308 lines
7.7 KiB
C
/*
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* Copyright 1995-2020 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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/* We need to use some engine deprecated APIs */
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#define OPENSSL_SUPPRESS_DEPRECATED
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#include <stdio.h>
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#include <time.h>
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#include "internal/cryptlib.h"
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#include <openssl/opensslconf.h>
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#include "crypto/rand.h"
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#include <openssl/engine.h>
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#include "internal/thread_once.h"
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#include "rand_local.h"
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#include "e_os.h"
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#ifndef FIPS_MODULE
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# include "prov/rand_pool.h"
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# include "prov/seeding.h"
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# ifndef OPENSSL_NO_ENGINE
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/* non-NULL if default_RAND_meth is ENGINE-provided */
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static ENGINE *funct_ref;
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static CRYPTO_RWLOCK *rand_engine_lock;
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# endif
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static CRYPTO_RWLOCK *rand_meth_lock;
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static const RAND_METHOD *default_RAND_meth;
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static CRYPTO_ONCE rand_init = CRYPTO_ONCE_STATIC_INIT;
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static int rand_inited = 0;
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DEFINE_RUN_ONCE_STATIC(do_rand_init)
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{
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# ifndef OPENSSL_NO_ENGINE
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rand_engine_lock = CRYPTO_THREAD_lock_new();
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if (rand_engine_lock == NULL)
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return 0;
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# endif
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rand_meth_lock = CRYPTO_THREAD_lock_new();
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if (rand_meth_lock == NULL)
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goto err;
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if (!rand_pool_init())
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goto err;
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rand_inited = 1;
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return 1;
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err:
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CRYPTO_THREAD_lock_free(rand_meth_lock);
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rand_meth_lock = NULL;
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# ifndef OPENSSL_NO_ENGINE
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CRYPTO_THREAD_lock_free(rand_engine_lock);
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rand_engine_lock = NULL;
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# endif
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return 0;
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}
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void rand_cleanup_int(void)
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{
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const RAND_METHOD *meth = default_RAND_meth;
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if (!rand_inited)
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return;
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if (meth != NULL && meth->cleanup != NULL)
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meth->cleanup();
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RAND_set_rand_method(NULL);
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rand_pool_cleanup();
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# ifndef OPENSSL_NO_ENGINE
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CRYPTO_THREAD_lock_free(rand_engine_lock);
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rand_engine_lock = NULL;
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# endif
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CRYPTO_THREAD_lock_free(rand_meth_lock);
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rand_meth_lock = NULL;
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rand_inited = 0;
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}
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/*
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* RAND_close_seed_files() ensures that any seed file descriptors are
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* closed after use. This only applies to libcrypto/default provider,
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* it does not apply to other providers.
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*/
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void RAND_keep_random_devices_open(int keep)
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{
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if (RUN_ONCE(&rand_init, do_rand_init))
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rand_pool_keep_random_devices_open(keep);
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}
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/*
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* RAND_poll() reseeds the default RNG using random input
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*
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* The random input is obtained from polling various entropy
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* sources which depend on the operating system and are
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* configurable via the --with-rand-seed configure option.
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*/
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int RAND_poll(void)
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{
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const RAND_METHOD *meth = RAND_get_rand_method();
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int ret = meth == RAND_OpenSSL();
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RAND_POOL *pool;
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if (meth == NULL)
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return 0;
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if (!ret) {
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/* fill random pool and seed the current legacy RNG */
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pool = rand_pool_new(RAND_DRBG_STRENGTH, 1,
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(RAND_DRBG_STRENGTH + 7) / 8,
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RAND_POOL_MAX_LENGTH);
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if (pool == NULL)
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return 0;
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if (prov_pool_acquire_entropy(pool) == 0)
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goto err;
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if (meth->add == NULL
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|| meth->add(rand_pool_buffer(pool),
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rand_pool_length(pool),
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(rand_pool_entropy(pool) / 8.0)) == 0)
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goto err;
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ret = 1;
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err:
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rand_pool_free(pool);
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}
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return ret;
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}
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int RAND_set_rand_method(const RAND_METHOD *meth)
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{
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if (!RUN_ONCE(&rand_init, do_rand_init))
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return 0;
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CRYPTO_THREAD_write_lock(rand_meth_lock);
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# ifndef OPENSSL_NO_ENGINE
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ENGINE_finish(funct_ref);
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funct_ref = NULL;
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# endif
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default_RAND_meth = meth;
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CRYPTO_THREAD_unlock(rand_meth_lock);
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return 1;
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}
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const RAND_METHOD *RAND_get_rand_method(void)
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{
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const RAND_METHOD *tmp_meth = NULL;
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if (!RUN_ONCE(&rand_init, do_rand_init))
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return NULL;
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CRYPTO_THREAD_write_lock(rand_meth_lock);
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if (default_RAND_meth == NULL) {
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# ifndef OPENSSL_NO_ENGINE
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ENGINE *e;
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/* If we have an engine that can do RAND, use it. */
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if ((e = ENGINE_get_default_RAND()) != NULL
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&& (tmp_meth = ENGINE_get_RAND(e)) != NULL) {
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funct_ref = e;
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default_RAND_meth = tmp_meth;
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} else {
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ENGINE_finish(e);
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default_RAND_meth = &rand_meth;
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}
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# else
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default_RAND_meth = &rand_meth;
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# endif
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}
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tmp_meth = default_RAND_meth;
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CRYPTO_THREAD_unlock(rand_meth_lock);
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return tmp_meth;
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}
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# if !defined(OPENSSL_NO_ENGINE)
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int RAND_set_rand_engine(ENGINE *engine)
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{
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const RAND_METHOD *tmp_meth = NULL;
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if (!RUN_ONCE(&rand_init, do_rand_init))
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return 0;
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if (engine != NULL) {
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if (!ENGINE_init(engine))
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return 0;
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tmp_meth = ENGINE_get_RAND(engine);
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if (tmp_meth == NULL) {
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ENGINE_finish(engine);
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return 0;
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}
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}
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CRYPTO_THREAD_write_lock(rand_engine_lock);
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/* This function releases any prior ENGINE so call it first */
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RAND_set_rand_method(tmp_meth);
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funct_ref = engine;
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CRYPTO_THREAD_unlock(rand_engine_lock);
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return 1;
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}
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# endif
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void RAND_seed(const void *buf, int num)
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{
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const RAND_METHOD *meth = RAND_get_rand_method();
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if (meth != NULL && meth->seed != NULL)
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meth->seed(buf, num);
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}
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void RAND_add(const void *buf, int num, double randomness)
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{
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const RAND_METHOD *meth = RAND_get_rand_method();
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if (meth != NULL && meth->add != NULL)
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meth->add(buf, num, randomness);
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}
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# if !defined(OPENSSL_NO_DEPRECATED_1_1_0)
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int RAND_pseudo_bytes(unsigned char *buf, int num)
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{
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const RAND_METHOD *meth = RAND_get_rand_method();
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if (meth != NULL && meth->pseudorand != NULL)
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return meth->pseudorand(buf, num);
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RANDerr(RAND_F_RAND_PSEUDO_BYTES, RAND_R_FUNC_NOT_IMPLEMENTED);
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return -1;
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}
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# endif
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int RAND_status(void)
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{
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RAND_DRBG *drbg;
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const RAND_METHOD *meth = RAND_get_rand_method();
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if (meth != NULL && meth != RAND_OpenSSL())
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return meth->status != NULL ? meth->status() : 0;
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if ((drbg = RAND_DRBG_get0_master()) == NULL || drbg->rand == NULL)
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return EVP_RAND_STATE_UNINITIALISED;
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return EVP_RAND_state(drbg->rand) == EVP_RAND_STATE_READY;
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}
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#else /* !FIPS_MODULE */
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const RAND_METHOD *RAND_get_rand_method(void)
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{
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return NULL;
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}
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#endif /* !FIPS_MODULE */
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/*
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* This function is not part of RAND_METHOD, so if we're not using
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* the default method, then just call RAND_bytes(). Otherwise make
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* sure we're instantiated and use the private DRBG.
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*/
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int RAND_priv_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num)
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{
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RAND_DRBG *drbg;
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const RAND_METHOD *meth = RAND_get_rand_method();
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if (meth != NULL && meth != RAND_OpenSSL()) {
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if (meth->bytes != NULL)
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return meth->bytes(buf, num);
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RANDerr(RAND_F_RAND_PRIV_BYTES_EX, RAND_R_FUNC_NOT_IMPLEMENTED);
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return -1;
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}
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drbg = OPENSSL_CTX_get0_private_drbg(ctx);
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if (drbg != NULL)
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return RAND_DRBG_bytes(drbg, buf, num);
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return 0;
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}
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int RAND_priv_bytes(unsigned char *buf, int num)
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{
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return RAND_priv_bytes_ex(NULL, buf, num);
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}
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int RAND_bytes_ex(OPENSSL_CTX *ctx, unsigned char *buf, int num)
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{
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RAND_DRBG *drbg;
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const RAND_METHOD *meth = RAND_get_rand_method();
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if (meth != NULL && meth != RAND_OpenSSL()) {
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if (meth->bytes != NULL)
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return meth->bytes(buf, num);
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RANDerr(RAND_F_RAND_BYTES_EX, RAND_R_FUNC_NOT_IMPLEMENTED);
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return -1;
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}
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drbg = OPENSSL_CTX_get0_public_drbg(ctx);
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if (drbg != NULL)
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return RAND_DRBG_bytes(drbg, buf, num);
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return 0;
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}
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int RAND_bytes(unsigned char *buf, int num)
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{
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return RAND_bytes_ex(NULL, buf, num);
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}
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