143 lines
6.4 KiB
Text
143 lines
6.4 KiB
Text
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=pod
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=head1 NAME
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X509v3_get_ext_count, X509v3_get_ext, X509v3_get_ext_by_NID,
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X509v3_get_ext_by_OBJ, X509v3_get_ext_by_critical, X509v3_delete_ext,
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X509v3_add_ext, X509_get0_extensions, X509_CRL_get0_extensions,
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X509_REVOKED_get0_extensions, X509_get_ext_count, X509_get_ext,
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X509_get_ext_by_NID, X509_get_ext_by_OBJ, X509_get_ext_by_critical,
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X509_delete_ext, X509_add_ext, X509_CRL_get_ext_count, X509_CRL_get_ext,
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X509_CRL_get_ext_by_NID, X509_CRL_get_ext_by_OBJ, X509_CRL_get_ext_by_critical,
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X509_CRL_delete_ext, X509_CRL_add_ext, X509_REVOKED_get_ext_count,
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X509_REVOKED_get_ext, X509_REVOKED_get_ext_by_NID, X509_REVOKED_get_ext_by_OBJ,
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X509_REVOKED_get_ext_by_critical, X509_REVOKED_delete_ext,
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X509_REVOKED_add_ext - extension stack utility functions.
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=head1 SYNOPSIS
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#include <openssl/x509.h>
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int X509v3_get_ext_count(const STACK_OF(X509_EXTENSION) *x);
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X509_EXTENSION *X509v3_get_ext(const STACK_OF(X509_EXTENSION) *x, int loc);
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int X509v3_get_ext_by_NID(const STACK_OF(X509_EXTENSION) *x,
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int nid, int lastpos);
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int X509v3_get_ext_by_OBJ(const STACK_OF(X509_EXTENSION) *x,
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ASN1_OBJECT *obj, int lastpos);
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int X509v3_get_ext_by_critical(const STACK_OF(X509_EXTENSION) *x,
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int crit, int lastpos);
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X509_EXTENSION *X509v3_delete_ext(STACK_OF(X509_EXTENSION) *x, int loc);
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STACK_OF(X509_EXTENSION) *X509v3_add_ext(STACK_OF(X509_EXTENSION) **x,
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X509_EXTENSION *ex, int loc);
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STACK_OF(X509_EXTENSION) *X509_get0_extensions(const X509 *x);
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STACK_OF(X509_EXTENSION) *X509_CRL_get0_extensions(X509_CRL *crl);
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STACK_OF(X509_EXTENSION) *X509_REVOKED_get0_extensions(X509_REVOKED *r);
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int X509_get_ext_count(X509 *x);
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X509_EXTENSION *X509_get_ext(X509 *x, int loc);
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int X509_get_ext_by_NID(X509 *x, int nid, int lastpos);
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int X509_get_ext_by_OBJ(X509 *x, ASN1_OBJECT *obj, int lastpos);
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int X509_get_ext_by_critical(X509 *x, int crit, int lastpos);
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X509_EXTENSION *X509_delete_ext(X509 *x, int loc);
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int X509_add_ext(X509 *x, X509_EXTENSION *ex, int loc);
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int X509_CRL_get_ext_count(X509_CRL *x);
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X509_EXTENSION *X509_CRL_get_ext(X509_CRL *x, int loc);
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int X509_CRL_get_ext_by_NID(X509_CRL *x, int nid, int lastpos);
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int X509_CRL_get_ext_by_OBJ(X509_CRL *x, ASN1_OBJECT *obj, int lastpos);
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int X509_CRL_get_ext_by_critical(X509_CRL *x, int crit, int lastpos);
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X509_EXTENSION *X509_CRL_delete_ext(X509_CRL *x, int loc);
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int X509_CRL_add_ext(X509_CRL *x, X509_EXTENSION *ex, int loc);
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int X509_REVOKED_get_ext_count(X509_REVOKED *x);
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X509_EXTENSION *X509_REVOKED_get_ext(X509_REVOKED *x, int loc);
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int X509_REVOKED_get_ext_by_NID(X509_REVOKED *x, int nid, int lastpos);
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int X509_REVOKED_get_ext_by_OBJ(X509_REVOKED *x, ASN1_OBJECT *obj,
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int lastpos);
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int X509_REVOKED_get_ext_by_critical(X509_REVOKED *x, int crit, int lastpos);
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X509_EXTENSION *X509_REVOKED_delete_ext(X509_REVOKED *x, int loc);
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int X509_REVOKED_add_ext(X509_REVOKED *x, X509_EXTENSION *ex, int loc);
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=head1 DESCRIPTION
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X509v3_get_ext_count() retrieves the number of extensions in B<x>.
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X509v3_get_ext() retrieves extension B<loc> from B<x>. The index B<loc>
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can take any value from B<0> to X509_get_ext_count(x) - 1. The returned
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extension is an internal pointer which B<must not> be freed up by the
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application.
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X509v3_get_ext_by_NID() and X509v3_get_ext_by_OBJ() look for an extension
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with B<nid> or B<obj> from extension stack B<x>. The search starts from the
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extension after B<lastpos> or from the beginning if <lastpos> is B<-1>. If
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the extension is found its index is returned otherwise B<-1> is returned.
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X509v3_get_ext_by_critical() is similar to X509v3_get_ext_by_NID() except it
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looks for an extension of criticality B<crit>. A zero value for B<crit>
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looks for a non-critical extension a non-zero value looks for a critical
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extension.
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X509v3_delete_ext() deletes the extension with index B<loc> from B<x>. The
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deleted extension is returned and must be freed by the caller. If B<loc>
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is in invalid index value B<NULL> is returned.
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X509v3_add_ext() adds extension B<ex> to stack B<*x> at position B<loc>. If
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B<loc> is B<-1> the new extension is added to the end. If B<*x> is B<NULL>
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a new stack will be allocated. The passed extension B<ex> is duplicated
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internally so it must be freed after use.
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X509_get0_extensions(), X509_CRL_get0_extensions() and
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X509_REVOKED_get0_extensions() retrieve the extensions from a certificate
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a CRL or a CRL entry respectively.
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X509_get_ext_count(), X509_get_ext(), X509_get_ext_by_NID(),
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X509_get_ext_by_OBJ(), X509_get_ext_by_critical(), X509_delete_ext()
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and X509_add_ext() operate on the extensions of certificate B<x> they are
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otherwise identical to the X509v3 functions.
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X509_CRL_get_ext_count(), X509_CRL_get_ext(), X509_CRL_get_ext_by_NID(),
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X509_CRL_get_ext_by_OBJ(), X509_CRL_get_ext_by_critical(),
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X509_CRL_delete_ext() and X509_CRL_add_ext() operate on the extensions of
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CRL B<x> they are otherwise identical to the X509v3 functions.
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X509_REVOKED_get_ext_count(), X509_REVOKED_get_ext(),
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X509_REVOKED_get_ext_by_NID(), X509_REVOKED_get_ext_by_OBJ(),
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X509_REVOKED_get_ext_by_critical(), X509_REVOKED_delete_ext() and
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X509_REVOKED_add_ext() operate on the extensions of CRL entry B<x>
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they are otherwise identical to the X509v3 functions.
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=head1 NOTES
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These functions are used to examine stacks of extensions directly. Many
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applications will want to parse or encode and add an extension: they should
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use the extension encode and decode functions instead such as
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X509_add1_ext_i2d() and X509_get_ext_d2i().
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Extension indices start from zero, so a zero index return value is B<not> an
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error. These search functions start from the extension B<after> the B<lastpos>
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parameter so it should initially be set to B<-1>, if it is set to zero the
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initial extension will not be checked.
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=head1 RETURN VALUES
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X509v3_get_ext_count() returns the extension count.
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X509v3_get_ext() and X509v3_delete_ext() return an B<X509_EXTENSION> pointer
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or B<NULL> if an error occurs.
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X509v3_get_ext_by_NID() X509v3_get_ext_by_OBJ() and
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X509v3_get_ext_by_critical() return the an extension index or B<-1> if an
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error occurs.
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X509v3_add_ext() returns a stack of extensions or B<NULL> on error.
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X509_get0_extensions(), X509_CRL_get0_extensions() and
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X509_REVOKED_get0_extensions() return a stack of extensions. If the extensions
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field is absent it will return B<NULL>: this is B<not> an error condition.
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=head1 SEE ALSO
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L<X509V3_get_d2i(3)>
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