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X509V3_GET_EXT_BY_NID(3) Library Functions Manual 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(X509_CRL *x);
X509_EXTENSION *
X509_CRL_get_ext(X509_CRL *x, int loc);
int
X509_CRL_get_ext_by_NID(X509_CRL *x, int nid, int lastpos);
int
X509_CRL_get_ext_by_OBJ(X509_CRL *x, ASN1_OBJECT *obj, int lastpos);
int
X509_CRL_get_ext_by_critical(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 returned.
X509v3_get_ext_by_critical() is similar to X509v3_get_ext_by_NID() except that it looks for an extension of criticality crit. A zero value for crit looks for a non-critical extension; a non-zero 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 an invalid index value, NULL is returned.
X509v3_add_ext() adds the extension ex to the 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 the 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 the 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_get_ext_d2i(3).
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 0, the initial extension will not be checked.

X509v3_get_ext_count() returns the extension count.
X509v3_get_ext() and X509v3_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 extension index or -1 if an error occurs.
X509v3_add_ext() returns a stack of extensions or NULL on error.

X509_EXTENSION_new(3), X509_REVOKED_new(3), X509V3_get_d2i(3)

These functions first appeared in SSLeay 0.8.0 and have been available since OpenBSD 2.4.
May 19, 2018 OpenBSD-current