gnutls_x509_crt_get_extension_by_oid man page

gnutls_x509_crt_get_extension_by_oid — API function


#include <gnutls/x509.h>

int gnutls_x509_crt_get_extension_by_oid(gnutls_x509_crt_t cert, const char * oid, unsigned indx, void * buf, size_t * buf_size, unsigned int * critical);


gnutls_x509_crt_t cert
should contain a gnutls_x509_crt_t type
const char * oid
holds an Object Identified in null terminated string
unsigned indx
In case multiple same OIDs exist in the extensions, this specifies which to send. Use (0) to get the first one.
void * buf
a pointer to a structure to hold the name (may be null)
size_t * buf_size
initially holds the size of buf
unsigned int * critical
will be non-zero if the extension is marked as critical


This function will return the extension specified by the OID in the certificate. The extensions will be returned as binary data DER encoded, in the provided buffer.


On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error code is returned. If the certificate does not contain the specified extension GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.

Reporting Bugs

Report bugs to <bugs@gnutls.org>.
Home page: http://www.gnutls.org

See Also

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gnutls 3.5.4