gnutls_x509_crt_get_extension_oid man page

gnutls_x509_crt_get_extension_oid — API function


#include <gnutls/x509.h>

int gnutls_x509_crt_get_extension_oid(gnutls_x509_crt_t cert, unsigned indx, void * oid, size_t * oid_size);


gnutls_x509_crt_t cert

should contain a gnutls_x509_crt_t type

unsigned indx

Specifies which extension OID to send. Use (0) to get the first one.

void * oid

a pointer to a structure to hold the OID (may be null)

size_t * oid_size

initially holds the size of  oid


This function will return the requested extension OID in the certificate. The extension OID will be stored as a string in the provided buffer.

The  oid returned will be null terminated, although  oid_size will not account for the trailing null.


On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error code is returned.  If you have reached the last extension available GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.

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3.6.2 gnutls