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/* crypto/engine/eng_init.c */
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/* ====================================================================
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* Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include "eng_int.h"
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/* Initialise a engine type for use (or up its functional reference count
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* if it's already in use). This version is only used internally. */
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EXPORT_C int engine_unlocked_init(ENGINE *e)
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{
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int to_return = 1;
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if((e->funct_ref == 0) && e->init)
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/* This is the first functional reference and the engine
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* requires initialisation so we do it now. */
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to_return = e->init(e);
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if(to_return)
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{
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/* OK, we return a functional reference which is also a
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* structural reference. */
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e->struct_ref++;
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e->funct_ref++;
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engine_ref_debug(e, 0, 1)
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engine_ref_debug(e, 1, 1)
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}
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return to_return;
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}
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/* Free a functional reference to a engine type. This version is only used
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* internally. */
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EXPORT_C int engine_unlocked_finish(ENGINE *e, int unlock_for_handlers)
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{
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int to_return = 1;
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/* Reduce the functional reference count here so if it's the terminating
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* case, we can release the lock safely and call the finish() handler
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* without risk of a race. We get a race if we leave the count until
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* after and something else is calling "finish" at the same time -
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* there's a chance that both threads will together take the count from
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* 2 to 0 without either calling finish(). */
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e->funct_ref--;
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engine_ref_debug(e, 1, -1);
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if((e->funct_ref == 0) && e->finish)
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{
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if(unlock_for_handlers)
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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to_return = e->finish(e);
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if(unlock_for_handlers)
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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if(!to_return)
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return 0;
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}
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#ifdef REF_CHECK
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if(e->funct_ref < 0)
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{
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fprintf(stderr,"ENGINE_finish, bad functional reference count\n");
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abort();
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}
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#endif
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/* Release the structural reference too */
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if(!engine_free_util(e, 0))
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{
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ENGINEerr(ENGINE_F_ENGINE_UNLOCKED_FINISH,ENGINE_R_FINISH_FAILED);
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return 0;
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}
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return to_return;
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}
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/* The API (locked) version of "init" */
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EXPORT_C int ENGINE_init(ENGINE *e)
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{
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int ret;
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if(e == NULL)
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{
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ENGINEerr(ENGINE_F_ENGINE_INIT,ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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ret = engine_unlocked_init(e);
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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return ret;
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}
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/* The API (locked) version of "finish" */
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EXPORT_C int ENGINE_finish(ENGINE *e)
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{
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int to_return = 1;
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if(e == NULL)
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{
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ENGINEerr(ENGINE_F_ENGINE_FINISH,ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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to_return = engine_unlocked_finish(e, 1);
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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if(!to_return)
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{
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ENGINEerr(ENGINE_F_ENGINE_FINISH,ENGINE_R_FINISH_FAILED);
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return 0;
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}
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return to_return;
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}
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