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       gnutls_x509_crt_get_dn_by_oid - API function


       #include <gnutls/x509.h>

       int  gnutls_x509_crt_get_dn_by_oid(gnutls_x509_crt_t  cert,  const  char  * oid, int indx,
       unsigned int raw_flag, void * buf, size_t * sizeof_buf);


       gnutls_x509_crt_t cert
                   should contain a gnutls_x509_crt_t structure

       const char * oid
                   holds an Object Identified in null terminated string

       int indx    In case multiple same OIDs exist in the RDN, this specifies which to send. Use
                   zero to get the first one.

       unsigned int raw_flag
                   If non zero returns the raw DER data of the DN part.

       void * buf  a pointer where the DN part will be copied (may be null).

       size_t * sizeof_buf
                   initially holds the size of buf


       This  function  will  extract the part of the name of the Certificate subject specified by
       the given OID. The output, if the raw flag is not used, will be encoded  as  described  in
       RFC2253. Thus a string that is ASCII or UTF-8 encoded, depending on the certificate data.

       Some  helper  macros  with popular OIDs can be found in gnutls/x509.h If raw flag is zero,
       this function will only return known OIDs as text. Other OIDs  will  be  DER  encoded,  as
       described in RFC2253 -- in hex format with a 'using gnutls_x509_dn_oid_known().

       If buf is null then only the size will be filled.


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


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