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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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 <stdio.h>
#include <time.h>
#include "internal/cryptlib.h"
#include <openssl/opensslconf.h>
#include "internal/rand.h"
#include <openssl/engine.h>
#include "internal/thread_once.h"
#ifdef OPENSSL_FIPS
# include <openssl/fips.h>
# include <openssl/fips_rand.h>
#endif
#ifndef OPENSSL_NO_ENGINE
/* non-NULL if default_RAND_meth is ENGINE-provided */
static ENGINE *funct_ref = NULL;
static CRYPTO_RWLOCK *rand_engine_lock = NULL;
#endif
static const RAND_METHOD *default_RAND_meth = NULL;
static CRYPTO_RWLOCK *rand_meth_lock = NULL;
static CRYPTO_ONCE rand_lock_init = CRYPTO_ONCE_STATIC_INIT;
DEFINE_RUN_ONCE_STATIC(do_rand_lock_init)
{
int ret = 1;
#ifndef OPENSSL_NO_ENGINE
rand_engine_lock = CRYPTO_THREAD_lock_new();
ret &= rand_engine_lock != NULL;
#endif
rand_meth_lock = CRYPTO_THREAD_lock_new();
ret &= rand_meth_lock != NULL;
return ret;
}
int RAND_set_rand_method(const RAND_METHOD *meth)
{
if (!RUN_ONCE(&rand_lock_init, do_rand_lock_init))
return 0;
CRYPTO_THREAD_write_lock(rand_meth_lock);
#ifndef OPENSSL_NO_ENGINE
ENGINE_finish(funct_ref);
funct_ref = NULL;
#endif
default_RAND_meth = meth;
CRYPTO_THREAD_unlock(rand_meth_lock);
return 1;
}
const RAND_METHOD *RAND_get_rand_method(void)
{
const RAND_METHOD *tmp_meth = NULL;
if (!RUN_ONCE(&rand_lock_init, do_rand_lock_init))
return NULL;
CRYPTO_THREAD_write_lock(rand_meth_lock);
if (!default_RAND_meth) {
#ifndef OPENSSL_NO_ENGINE
ENGINE *e = ENGINE_get_default_RAND();
if (e) {
default_RAND_meth = ENGINE_get_RAND(e);
if (default_RAND_meth == NULL) {
ENGINE_finish(e);
e = NULL;
}
}
if (e)
funct_ref = e;
else
#endif
default_RAND_meth = RAND_OpenSSL();
}
tmp_meth = default_RAND_meth;
CRYPTO_THREAD_unlock(rand_meth_lock);
return tmp_meth;
}
#ifndef OPENSSL_NO_ENGINE
int RAND_set_rand_engine(ENGINE *engine)
{
const RAND_METHOD *tmp_meth = NULL;
if (!RUN_ONCE(&rand_lock_init, do_rand_lock_init))
return 0;
if (engine) {
if (!ENGINE_init(engine))
return 0;
tmp_meth = ENGINE_get_RAND(engine);
if (tmp_meth == NULL) {
ENGINE_finish(engine);
return 0;
}
}
CRYPTO_THREAD_write_lock(rand_engine_lock);
/* This function releases any prior ENGINE so call it first */
RAND_set_rand_method(tmp_meth);
funct_ref = engine;
CRYPTO_THREAD_unlock(rand_engine_lock);
return 1;
}
#endif
void rand_cleanup_int(void)
{
const RAND_METHOD *meth = default_RAND_meth;
if (meth && meth->cleanup)
meth->cleanup();
RAND_set_rand_method(NULL);
CRYPTO_THREAD_lock_free(rand_meth_lock);
#ifndef OPENSSL_NO_ENGINE
CRYPTO_THREAD_lock_free(rand_engine_lock);
#endif
}
void RAND_seed(const void *buf, int num)
{
const RAND_METHOD *meth = RAND_get_rand_method();
if (meth && meth->seed)
meth->seed(buf, num);
}
void RAND_add(const void *buf, int num, double entropy)
{
const RAND_METHOD *meth = RAND_get_rand_method();
if (meth && meth->add)
meth->add(buf, num, entropy);
}
int RAND_bytes(unsigned char *buf, int num)
{
const RAND_METHOD *meth = RAND_get_rand_method();
if (meth && meth->bytes)
return meth->bytes(buf, num);
return (-1);
}
#if OPENSSL_API_COMPAT < 0x10100000L
int RAND_pseudo_bytes(unsigned char *buf, int num)
{
const RAND_METHOD *meth = RAND_get_rand_method();
if (meth && meth->pseudorand)
return meth->pseudorand(buf, num);
return (-1);
}
#endif
int RAND_status(void)
{
const RAND_METHOD *meth = RAND_get_rand_method();
if (meth && meth->status)
return meth->status();
return 0;
}
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