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X509V3_GET_EXT_BY_NID(3)	    OpenSSL	      X509V3_GET_EXT_BY_NID(3)

       X509v3_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

	#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);

       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

       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.

       These 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.

       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.


       Copyright 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

1.1.1k				  2021-03-25	      X509V3_GET_EXT_BY_NID(3)


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