=pod =head1 NAME OPENSSL_init_crypto, OPENSSL_cleanup, OPENSSL_atexit, OPENSSL_thread_stop - OpenSSL initialisation and deinitialisation functions =head1 SYNOPSIS #include void OPENSSL_cleanup(void); int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings); int OPENSSL_atexit(void (*handler)(void)); void OPENSSL_thread_stop(void); OPENSSL_INIT_SETTINGS *OPENSSL_init_new(void); OPENSSL_INIT_set_config_filename(OPENSSL_INIT_SETTINGS *init, const char* name); OPENSSL_INIT_free(OPENSSL_INIT_SETTINGS *init); =head1 DESCRIPTION During normal operation OpenSSL (libcrypto) will allocate various resources at start up that must, subsequently, be freed on close down of the library. Additionally some resources are allocated on a per thread basis (if the application is multi-threaded), and these resources must be freed prior to the thread closing. As of version 1.1.0 OpenSSL will automatically allocate all resources that it needs so no explicit initialisation is required. Similarly it will also automatically deinitialise as required. However, there way be situations when explicit initialisation is desirable or needed, for example when some non-default initialisation is required. The function OPENSSL_init_crypto() can be used for this purpose for libcrypto (see also L for the libssl equivalent). Numerous internal OpenSSL functions call OPENSSL_init_crypto(). Therefore, in order to perform non-default initialisation, OPENSSL_init_crypto() MUST be called by application code prior to any other OpenSSL function calls. The B parameter specifies which aspects of libcrypto should be initialised. Valid options are: =over 4 =item OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS Suppress automatic loading of the libcrypto error strings. This option is not a default option. Once selected subsequent calls to OPENSSL_init_crypto() with the option B will be ignored. =item OPENSSL_INIT_LOAD_CRYPTO_STRINGS Automatic loading of the libcrypto error strings. With this option the library will automatically load the libcrypto error strings. This option is a default option. Once selected subsequent calls to OPENSSL_init_crypto() with the option B will be ignored. =item OPENSSL_INIT_ADD_ALL_CIPHERS With this option the library will automatically load and make available all libcrypto ciphers. This option is a default option. Once selected subsequent calls to OPENSSL_init_crypto() with the option B will be ignored. =item OPENSSL_INIT_ADD_ALL_DIGESTS With this option the library will automatically load and make available all libcrypto digests. This option is a default option. Once selected subsequent calls to OPENSSL_init_crypto() with the option B will be ignored. =item OPENSSL_INIT_NO_ADD_ALL_CIPHERS With this option the library will suppress automatic loading of libcrypto ciphers. This option is not a default option. Once selected subsequent calls to OPENSSL_init_crypto() with the option B will be ignored. =item OPENSSL_INIT_NO_ADD_ALL_DIGESTS With this option the library will suppress automatic loading of libcrypto digests. This option is not a default option. Once selected subsequent calls to OPENSSL_init_crypto() with the option B will be ignored. =item OPENSSL_INIT_LOAD_CONFIG With this option an OpenSSL configuration file will be automatically loaded and used by calling OPENSSL_config(). This is not a default option. See the description of OPENSSL_init_new(), below. =item OPENSSL_INIT_NO_LOAD_CONFIG With this option the loading of OpenSSL configuration files will be suppressed. It is the equivalent of calling OPENSSL_no_config(). This is not a default option. =item OPENSSL_INIT_ASYNC With this option the library with automatically initialise the libcrypto async sub-library (see L). This is a default option. =item OPENSSL_INIT_ENGINE_RDRAND With this option the library will automatically load and initialise the RDRAND engine (if available). This not a default option. =item OPENSSL_INIT_ENGINE_DYNAMIC With this option the library will automatically load and initialise the dynamic engine. This not a default option. =item OPENSSL_INIT_ENGINE_OPENSSL With this option the library will automatically load and initialise the openssl engine. This not a default option. =item OPENSSL_INIT_ENGINE_CRYPTODEV With this option the library will automatically load and initialise the cryptodev engine (if available). This not a default option. =item OPENSSL_INIT_ENGINE_CAPI With this option the library will automatically load and initialise the CAPI engine (if available). This not a default option. =item OPENSSL_INIT_ENGINE_PADLOCK With this option the library will automatically load and initialise the padlock engine (if available). This not a default option. =item OPENSSL_INIT_ENGINE_DASYNC With this option the library will automatically load and initialise the DASYNC engine. This not a default option. =item OPENSSL_INIT_ENGINE_ALL_BUILTIN With this option the library will automatically load and initialise all the built in engines listed above with the exception of the openssl and dasync engines. This not a default option. =back Multiple options may be combined together in a single call to OPENSSL_init_crypto(). For example: OPENSSL_init_crypto(OPENSSL_INIT_NO_ADD_ALL_CIPHERS | OPENSSL_INIT_NO_ADD_ALL_DIGESTS, NULL); The OPENSSL_cleanup() function deinitialises OpenSSL (both libcrypto and libssl). All resources allocated by OpenSSL are freed. Typically there should be no need to call this function directly as it is initiated automatically on application exit. This is done via the standard C library L function. In the event that the application will close in a manner that will not call the registered atexit() handlers then the application should call OPENSSL_cleanup() directly. Developers of libraries using OpenSSL are discouraged from calling this function and should instead, typically, rely on auto-deinitialisation. This is to avoid error conditions where both an application and a library it depends on both use OpenSSL, and the library deinitialises it before the application has finished using it. Once OPENSSL_cleanup() has been called the library cannot be reinitialised. Attempts to call OPENSSL_init_crypto() will fail and an ERR_R_INIT_FAIL error will be added to the error stack. Note that because initialisation has failed OpenSSL error strings will not be available, only an error code. This code can be put through the openssl errstr command line application to produce a human readable error (see L). The OPENSSL_atexit() function enables the registration of a function to be called during OPENSSL_cleanup(). Stop handlers are called after deinitialisation of resources local to a thread, but before other process wide resources are freed. In the event that multiple stop handlers are registered, no guarantees are made about the order of execution. The OPENSSL_thread_stop() function deallocates resources associated with the current thread. Typically this function will be called automatically by the library when the thread exits. This should only be called directly if resources should be freed at an earlier time, or under the circumstances described in the NOTES section below. The B flag will load a default configuration file. To specify a different file, an B must be created and used. The routines OPENSSL_init_new() and OPENSSL_INIT_set_config_filename() can be used to allocate the object and set the configuration filename, and then the object can be released with OPENSSL_INIT_free() when done. =head1 NOTES Resources local to a thread are deallocated automatically when the thread exits (e.g. in a pthreads environment, when pthread_exit() is called). On Windows platforms this is done in response to a DLL_THREAD_DETACH message being sent to the libeay32.dll entry point. Some windows functions may cause threads to exit without sending this message (for example ExitProcess()). If the application uses such functions, then the application must free up OpenSSL resources directly via a call to OPENSSL_thread_stop(). Similarly this message will also not be sent if OpenSSL is linked statically, and therefore applications using static linking should also call OPENSSL_thread_stop(). =head1 RETURN VALUES The functions OPENSSL_init_crypto and OPENSSL_atexit() returns 1 on success or 0 on error. =head1 SEE ALSO L =head1 HISTORY The OPENSSL_init_crypto(), OPENSSL_cleanup(), OPENSSL_atexit(), and OPENSSL_thread_stop() functions were added in OpenSSL 1.1.0. =cut