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NAMECRYPTO_EX_new, CRYPTO_EX_free, CRYPTO_EX_dup, CRYPTO_free_ex_index, CRYPTO_get_ex_new_index, CRYPTO_set_ex_data, CRYPTO_get_ex_data, CRYPTO_free_ex_data, CRYPTO_new_ex_data - functions supporting application-specific data
SYNOPSIS#include <openssl/crypto.h> int CRYPTO_get_ex_new_index(int class_index, long argl, void *argp, CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func); typedef void CRYPTO_EX_new(void *parent, void *ptr, CRYPTO_EX_DATA *ad, int idx, long argl, void *argp); typedef void CRYPTO_EX_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad, int idx, long argl, void *argp); typedef int CRYPTO_EX_dup(CRYPTO_EX_DATA *to, const CRYPTO_EX_DATA *from, void *from_d, int idx, long argl, void *argp); int CRYPTO_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad) int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg); void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx); void CRYPTO_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *r); int CRYPTO_free_ex_index(int class_index, int idx);
DESCRIPTIONSeveral OpenSSL structures can have application-specific data attached to them, known as "exdata." The specific structures are: APP BIO DH DRBG DSA EC_KEY ENGINE RSA SSL SSL_CTX SSL_SESSION UI UI_METHOD X509 X509_STORE X509_STORE_CTX Each is identified by an CRYPTO_EX_INDEX_xxx define in the crypto.h header file. In addition, CRYPTO_EX_INDEX_APP is reserved for applications to use this facility for their own structures. The API described here is used by OpenSSL to manipulate exdata for specific structures. Since the application data can be anything at all it is passed and retrieved as a void * type. The CRYPTO_EX_DATA type is opaque. To initialize the exdata part of
a structure, call Exdata types are identified by an index, an integer guaranteed to be unique within structures for the lifetime of the program. Applications using exdata typically call CRYPTO_get_ex_new_index at startup, and store the result in a global variable, or write a wrapper function to provide lazy evaluation. The class_index should be one of the CRYPTO_EX_INDEX_xxx values. The argl and argp parameters are saved to be passed to the callbacks but are otherwise not used. In order to transparently manipulate exdata, three callbacks must be provided. The semantics of those callbacks are described below. When copying or releasing objects with exdata, the callback functions are called in increasing order of their index value. If a dynamic library can be unloaded, it should call To set or get the exdata on an object, the appropriate type-specific routine must be used. This is because the containing structure is opaque and the CRYPTO_EX_DATA field is not accessible. In both API's, the idx parameter should be an already-created index value. When setting exdata, the pointer specified with a particular index is saved, and returned on a subsequent "get" call. If the application is going to release the data, it must make sure to set a NULL value at the index, to avoid likely double-free crashes. The function CRYPTO_free_ex_data is used to free all exdata attached to a structure. The appropriate type-specific routine must be used. The class_index identifies the structure type, the obj is a pointer to the actual structure, and r is a pointer to the structure's exdata field.
Callback FunctionsThis section describes how the callback functions are used. Applications that are defining their own exdata using CYPRTO_EX_INDEX_APP must call them as described here. When a structure is initially allocated (such as RSA_new()) then the
When a structure is free'd (such as SSL_CTX_free()) then the
Both
RETURN VALUES
COPYRIGHTCopyright 2015-2019 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. |
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