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Document X509_get0_subject_key_id()

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Reviewed-by: Rich Salz <rsalz@openssl.org>
This commit is contained in:
Dr. Stephen Henson 2015-09-22 18:51:47 +01:00
parent d19a50c9fb
commit 69d492eac8
1 changed files with 18 additions and 3 deletions
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21
doc/crypto/X509_get_extension_flags.pod
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@ -12,6 +12,7 @@ retrieve certificate extension flags.
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
@ -90,11 +91,16 @@ B<id-kp-timeStamping>, B<id-kp-dvcs> and B<anyExtendedKeyUsage> respectively.
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
@ -103,10 +109,19 @@ extension is absent. Applications can additionally check the return value of
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