gnutls_x509_crt_get_key_purpose_oid man page on Archlinux

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       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  terminated, 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 <>.
       Home page:

       Copyright © 2001-2014 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 /usr/share/doc/gnutls/ directory does not contain the HTML form

gnutls				     3.3gnutls_x509_crt_get_key_purpose_oid(3)

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