Document X509_get0_subject_key_id()

   uint32_t X509_get_extension_flags(X509 *x);

   uint32_t X509_get_key_usage(X509 *x);

   uint32_t X509_get_extended_key_usage(X509 *x);

   const ASN1_OCTET_STRING *X509_get0_subject_key_id(X509 *x);

=head1 DESCRIPTION

Additionally B<XKU_SGC> is set if either Netscape or Microsoft SGC OIDs are

present.

X509_get_extended_key_usage() return an internal pointer to the subject key

identifier of B<x> as an B<ASN1_OCTET_STRING> or B<NULL> if the extension

is not present or cannot be parsed.

=head1 NOTES

The value of the flags correspond to extension values which are cached

in the B<X509> structure. If the flags returned do not provide sufficient

information an application should examine extension values directly.

information an application should examine extension values directly

for example using X509_get_ext_d2i().

If the key usage or extended key usage extension is absent then typically usage

is unrestricted. For this reason X509_get_key_usage() and

X509_get_extension_flags() and take appropriate action is an extension is

absent.

If X509_get0_subject_key_id() returns B<NULL> then the extension may be

absent or malformed. Applications can determine the precise reason using

X509_get_ext_d2i().

=head1 RETURN VALUE

These functions all return sets of flags corresponding to the certificate

extension values.

X509_get_extension_flags(), X509_get_key_usage() and

X509_get_extended_key_usage() return sets of flags corresponding to the

certificate extension values.

X509_get0_subject_key_id() returns the subject key identifier as a

pointer to an B<ASN1_OCTET_STRING> structure or B<NULL> if the extension

is absent or an error occured during parsing.

=head1 SEE ALSO