X509V3_GET_EXT_BY_NID - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEX509v3_get_ext_count, X509v3_get_ext, X509v3_get_ext_by_NID, X509v3_get_ext_by_OBJ, X509v3_get_ext_by_critical, X509v3_delete_ext, X509v3_add_ext, X509_get_ext_count, X509_get_ext, X509_get_ext_by_NID, X509_get_ext_by_OBJ, X509_get_ext_by_critical, X509_delete_ext, X509_add_ext, X509_CRL_get_ext_count, X509_CRL_get_ext, X509_CRL_get_ext_by_NID, X509_CRL_get_ext_by_OBJ, X509_CRL_get_ext_by_critical, X509_CRL_delete_ext, X509_CRL_add_ext, X509_REVOKED_get_ext_count, X509_REVOKED_get_ext, X509_REVOKED_get_ext_by_NID, X509_REVOKED_get_ext_by_OBJ, X509_REVOKED_get_ext_by_critical, X509_REVOKED_delete_ext, X509_REVOKED_add_ext − extension stack utility functions
SYNOPSIS​ #include <openssl/x509.h> ​ ​ int X509v3_get_ext_count(const STACK_OF(X509_EXTENSION) *x); ​ X509_EXTENSION *X509v3_get_ext(const STACK_OF(X509_EXTENSION) *x, int loc); ​ ​ int X509v3_get_ext_by_NID(const STACK_OF(X509_EXTENSION) *x, ​ int nid, int lastpos); ​ int X509v3_get_ext_by_OBJ(const STACK_OF(X509_EXTENSION) *x, ​ const ASN1_OBJECT *obj, int lastpos); ​ int X509v3_get_ext_by_critical(const STACK_OF(X509_EXTENSION) *x, ​ int crit, int lastpos); ​ X509_EXTENSION *X509v3_delete_ext(STACK_OF(X509_EXTENSION) *x, int loc); ​ STACK_OF(X509_EXTENSION) *X509v3_add_ext(STACK_OF(X509_EXTENSION) **x, ​ X509_EXTENSION *ex, int loc); ​ ​ int X509_get_ext_count(const X509 *x); ​ X509_EXTENSION *X509_get_ext(const X509 *x, int loc); ​ int X509_get_ext_by_NID(const X509 *x, int nid, int lastpos); ​ int X509_get_ext_by_OBJ(const X509 *x, const ASN1_OBJECT *obj, int lastpos); ​ int X509_get_ext_by_critical(const X509 *x, int crit, int lastpos); ​ X509_EXTENSION *X509_delete_ext(X509 *x, int loc); ​ int X509_add_ext(X509 *x, X509_EXTENSION *ex, int loc); ​ ​ int X509_CRL_get_ext_count(const X509_CRL *x); ​ X509_EXTENSION *X509_CRL_get_ext(const X509_CRL *x, int loc); ​ int X509_CRL_get_ext_by_NID(const X509_CRL *x, int nid, int lastpos); ​ int X509_CRL_get_ext_by_OBJ(const X509_CRL *x, const ASN1_OBJECT *obj, int lastpos); ​ int X509_CRL_get_ext_by_critical(const X509_CRL *x, int crit, int lastpos); ​ X509_EXTENSION *X509_CRL_delete_ext(X509_CRL *x, int loc); ​ int X509_CRL_add_ext(X509_CRL *x, X509_EXTENSION *ex, int loc); ​ ​ int X509_REVOKED_get_ext_count(const X509_REVOKED *x); ​ X509_EXTENSION *X509_REVOKED_get_ext(const X509_REVOKED *x, int loc); ​ int X509_REVOKED_get_ext_by_NID(const X509_REVOKED *x, int nid, int lastpos); ​ int X509_REVOKED_get_ext_by_OBJ(const X509_REVOKED *x, const ASN1_OBJECT *obj, ​ int lastpos); ​ int X509_REVOKED_get_ext_by_critical(const X509_REVOKED *x, int crit, int lastpos); ​ X509_EXTENSION *X509_REVOKED_delete_ext(X509_REVOKED *x, int loc); ​ int X509_REVOKED_add_ext(X509_REVOKED *x, X509_EXTENSION *ex, int loc);
DESCRIPTION​X509v3_get_ext_count() retrieves the number of extensions in x. ​X509v3_get_ext() retrieves extension loc from x. The index loc can take any value from 0 to X509_get_ext_count(x) − 1. The returned extension is an internal pointer which must not be freed up by the application. ​X509v3_get_ext_by_NID() and X509v3_get_ext_by_OBJ() look for an extension with nid or obj from extension stack x. The search starts from the extension after lastpos or from the beginning if <lastpos> is −1. If the extension is found its index is returned otherwise −1 is returned. ​X509v3_get_ext_by_critical() is similar to X509v3_get_ext_by_NID() except it looks for an extension of criticality crit. A zero value for crit looks for a non-critical extension a nonzero value looks for a critical extension. ​X509v3_delete_ext() deletes the extension with index loc from x. The deleted extension is returned and must be freed by the caller. If loc is in invalid index value NULL is returned. ​X509v3_add_ext() adds extension ex to stack *x at position loc. If ​loc is −1 the new extension is added to the end. If *x is NULL a new stack will be allocated. The passed extension ex is duplicated internally so it must be freed after use. ​X509_get_ext_count(), X509_get_ext(), X509_get_ext_by_NID(), ​X509_get_ext_by_OBJ(), X509_get_ext_by_critical(), X509_delete_ext() and X509_add_ext() operate on the extensions of certificate x they are otherwise identical to the X509v3 functions. ​X509_CRL_get_ext_count(), X509_CRL_get_ext(), X509_CRL_get_ext_by_NID(), ​X509_CRL_get_ext_by_OBJ(), X509_CRL_get_ext_by_critical(), ​X509_CRL_delete_ext() and X509_CRL_add_ext() operate on the extensions of ​CRL x they are otherwise identical to the X509v3 functions. ​X509_REVOKED_get_ext_count(), X509_REVOKED_get_ext(), ​X509_REVOKED_get_ext_by_NID(), X509_REVOKED_get_ext_by_OBJ(), ​X509_REVOKED_get_ext_by_critical(), X509_REVOKED_delete_ext() and ​X509_REVOKED_add_ext() operate on the extensions of CRL entry x they are otherwise identical to the X509v3 functions.
NOTESThese functions are used to examine stacks of extensions directly. Many applications will want to parse or encode and add an extension: they should use the extension encode and decode functions instead such as ​X509_add1_ext_i2d() and X509_get_ext_d2i(). Extension indices start from zero, so a zero index return value is not an error. These search functions start from the extension after the lastpos parameter so it should initially be set to −1, if it is set to zero the initial extension will not be checked.
RETURN VALUES​X509v3_get_ext_count() returns the extension count. ​X509v3_get_ext(), X509v3_delete_ext() and X509_delete_ext() return an ​X509_EXTENSION pointer or NULL if an error occurs. ​X509v3_get_ext_by_NID() X509v3_get_ext_by_OBJ() and ​X509v3_get_ext_by_critical() return the an extension index or −1 if an error occurs. ​X509v3_add_ext() returns a stack of extensions or NULL on error. ​X509_add_ext() returns 1 on success and 0 on error.
SEE ALSO​X509V3_get_d2i (3)
COPYRIGHTCopyright 2015−2020 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>. 0
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