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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>
- #ifndef OPENSSL_NO_ENGINE
- /* non-NULL if default_RAND_meth is ENGINE-provided */
- static ENGINE *funct_ref = NULL;
- #endif
- static const RAND_METHOD *default_RAND_meth = NULL;
- int RAND_set_rand_method(const RAND_METHOD *meth)
- {
- #ifndef OPENSSL_NO_ENGINE
- ENGINE_finish(funct_ref);
- funct_ref = NULL;
- #endif
- default_RAND_meth = meth;
- return 1;
- }
- const RAND_METHOD *RAND_get_rand_method(void)
- {
- 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();
- }
- return default_RAND_meth;
- }
- #ifndef OPENSSL_NO_ENGINE
- int RAND_set_rand_engine(ENGINE *engine)
- {
- const RAND_METHOD *tmp_meth = NULL;
- if (engine) {
- if (!ENGINE_init(engine))
- return 0;
- tmp_meth = ENGINE_get_RAND(engine);
- if (tmp_meth == NULL) {
- ENGINE_finish(engine);
- return 0;
- }
- }
- /* This function releases any prior ENGINE so call it first */
- RAND_set_rand_method(tmp_meth);
- funct_ref = engine;
- return 1;
- }
- #endif
- void rand_cleanup_int(void)
- {
- const RAND_METHOD *meth = RAND_get_rand_method();
- if (meth && meth->cleanup)
- meth->cleanup();
- RAND_set_rand_method(NULL);
- }
- 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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