2 * Copyright 2001-2023 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /* We need to use some engine deprecated APIs */
11 #define OPENSSL_SUPPRESS_DEPRECATED
13 #include "internal/e_os.h"
14 #include "eng_local.h"
17 * Initialise an engine type for use (or up its functional reference count if
18 * it's already in use). This version is only used internally.
20 int engine_unlocked_init(ENGINE *e)
24 if ((e->funct_ref == 0) && e->init)
26 * This is the first functional reference and the engine requires
27 * initialisation so we do it now.
29 to_return = e->init(e);
34 * OK, we return a functional reference which is also a structural
37 if (!CRYPTO_UP_REF(&e->struct_ref, &ref)) {
42 ENGINE_REF_PRINT(e, 0, 1);
43 ENGINE_REF_PRINT(e, 1, 1);
49 * Free a functional reference to an engine type. This version is only used
52 int engine_unlocked_finish(ENGINE *e, int unlock_for_handlers)
57 * Reduce the functional reference count here so if it's the terminating
58 * case, we can release the lock safely and call the finish() handler
59 * without risk of a race. We get a race if we leave the count until
60 * after and something else is calling "finish" at the same time -
61 * there's a chance that both threads will together take the count from 2
62 * to 0 without either calling finish().
65 ENGINE_REF_PRINT(e, 1, -1);
66 if ((e->funct_ref == 0) && e->finish) {
67 if (unlock_for_handlers)
68 CRYPTO_THREAD_unlock(global_engine_lock);
69 to_return = e->finish(e);
70 if (unlock_for_handlers)
71 if (!CRYPTO_THREAD_write_lock(global_engine_lock))
76 REF_ASSERT_ISNT(e->funct_ref < 0);
77 /* Release the structural reference too */
78 if (!engine_free_util(e, 0)) {
79 ERR_raise(ERR_LIB_ENGINE, ENGINE_R_FINISH_FAILED);
85 /* The API (locked) version of "init" */
86 int ENGINE_init(ENGINE *e)
90 ERR_raise(ERR_LIB_ENGINE, ERR_R_PASSED_NULL_PARAMETER);
93 if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {
94 /* Maybe this should be raised in do_engine_lock_init() */
95 ERR_raise(ERR_LIB_ENGINE, ERR_R_CRYPTO_LIB);
98 if (!CRYPTO_THREAD_write_lock(global_engine_lock))
100 ret = engine_unlocked_init(e);
101 CRYPTO_THREAD_unlock(global_engine_lock);
105 /* The API (locked) version of "finish" */
106 int ENGINE_finish(ENGINE *e)
112 if (!CRYPTO_THREAD_write_lock(global_engine_lock))
114 to_return = engine_unlocked_finish(e, 1);
115 CRYPTO_THREAD_unlock(global_engine_lock);
117 ERR_raise(ERR_LIB_ENGINE, ENGINE_R_FINISH_FAILED);