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gnutls_x509_crt_get_key_purpose_oid(3)	      gnutls	   gnutls_x509_crt_get_key_purpose_oid(3)

       gnutls_x509_crt_get_key_purpose_oid - API function

       #include <gnutls/x509.h>

       int  gnutls_x509_crt_get_key_purpose_oid(gnutls_x509_crt_t  cert,  int  indx,  void * oid,
       size_t * oid_size, unsigned int * critical);

       gnutls_x509_crt_t cert
		   should contain a gnutls_x509_crt_t structure

       int indx    This specifies which OID to return. Use (0) to get the first one.

       void * oid  a pointer to a buffer to hold the OID (may be null)

       size_t * oid_size
		   initially holds the size of	oid

       unsigned int * critical
		   output flag to indicate criticality of extension

       This function will extract the key purpose OIDs of the Certificate specified by the  given
       index.	These  are  stored  in	the  Extended  Key  Usage  extension  ( See the
       GNUTLS_KP_* definitions for human readable names.

       If  oid is null then only the size will be filled. The  oid returned will be  null  termi-
       nated, although	oid_size will not account for the trailing null.

       GNUTLS_E_SHORT_MEMORY_BUFFER  if  the provided buffer is not long enough, and in that case
       the *oid_size will be updated with the required size.  On success 0 is returned.

       Report bugs to <bug-gnutls@gnu.org>.
       General guidelines for reporting bugs: http://www.gnu.org/gethelp/
       GnuTLS home page: http://www.gnu.org/software/gnutls/

       Copyright (C) 2012 Free Software Foundation, Inc..
       Copying and distribution of this file, with or without modification, are permitted in  any
       medium without royalty provided the copyright notice and this notice are preserved.

       The  full  documentation  for  gnutls  is maintained as a Texinfo manual.  If the info and
       gnutls programs are properly installed at your site, the command

	      info gnutls

       should give you access to the complete manual.  As an alternative you may obtain the  man-
       ual from:


gnutls					      3.1.15	   gnutls_x509_crt_get_key_purpose_oid(3)
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