X-Git-Url: https://git.openssl.org/?p=openssl.git;a=blobdiff_plain;f=crypto%2Frand%2Frand_lib.c;h=84d6b5d6c7f03805a5bc218520e6f768685a84ea;hp=0f96e166e530a9fb8027a43c87a2115803df6ec7;hb=0ea155fc1c4e6ba3655f435164ea3f884883df29;hpb=17f389bbbfccf057a8bc04084ed068c4b368e751 diff --git a/crypto/rand/rand_lib.c b/crypto/rand/rand_lib.c index 0f96e166e5..84d6b5d6c7 100644 --- a/crypto/rand/rand_lib.c +++ b/crypto/rand/rand_lib.c @@ -1,97 +1,160 @@ -/* crypto/rand/rand_lib.c */ -/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) - * All rights reserved. +/* + * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. * - * This package is an SSL implementation written - * by Eric Young (eay@cryptsoft.com). - * The implementation was written so as to conform with Netscapes SSL. - * - * This library is free for commercial and non-commercial use as long as - * the following conditions are aheared to. The following conditions - * apply to all code found in this distribution, be it the RC4, RSA, - * lhash, DES, etc., code; not just the SSL code. The SSL documentation - * included with this distribution is covered by the same copyright terms - * except that the holder is Tim Hudson (tjh@cryptsoft.com). - * - * Copyright remains Eric Young's, and as such any Copyright notices in - * the code are not to be removed. - * If this package is used in a product, Eric Young should be given attribution - * as the author of the parts of the library used. - * This can be in the form of a textual message at program startup or - * in documentation (online or textual) provided with the package. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * "This product includes cryptographic software written by - * Eric Young (eay@cryptsoft.com)" - * The word 'cryptographic' can be left out if the rouines from the library - * being used are not cryptographic related :-). - * 4. If you include any Windows specific code (or a derivative thereof) from - * the apps directory (application code) you must include an acknowledgement: - * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" - * - * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * The licence and distribution terms for any publically available version or - * derivative of this code cannot be changed. i.e. this code cannot simply be - * copied and put under another distribution licence - * [including the GNU Public Licence.] + * 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 #include -#include +#include "internal/cryptlib.h" +#include +#include "internal/rand.h" +#include +#include "internal/thread_once.h" -#ifdef NO_RAND -static RAND_METHOD *rand_meth=NULL; -#else -extern RAND_METHOD rand_ssleay_meth; -static RAND_METHOD *rand_meth= &rand_ssleay_meth; +#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; -void RAND_set_rand_method(RAND_METHOD *meth) - { - rand_meth=meth; - } +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; +} -RAND_METHOD *RAND_get_rand_method(void) - { - return(rand_meth); - } +#ifndef OPENSSL_NO_ENGINE +int RAND_set_rand_engine(ENGINE *engine) +{ + const RAND_METHOD *tmp_meth = NULL; -void RAND_cleanup(void) - { - if (rand_meth != NULL) - rand_meth->cleanup(); - } + 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) - { - if (rand_meth != NULL) - rand_meth->seed(buf,num); - } +{ + const RAND_METHOD *meth = RAND_get_rand_method(); + if (meth && meth->seed) + meth->seed(buf, num); +} -void RAND_bytes(unsigned char *buf, int num) - { - if (rand_meth != NULL) - rand_meth->bytes(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); + RANDerr(RAND_F_RAND_BYTES, RAND_R_FUNC_NOT_IMPLEMENTED); + 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; +}