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       gnutls_x509_privkey_export_pkcs8   -  This  function  will  export  the
       private key to PKCS8 format


       #include <gnutls/x509.h>

       int     gnutls_x509_privkey_export_pkcs8(gnutls_x509_privkey_t     key,
       gnutls_x509_crt_fmt_t  format,  const  char  *  password,  unsigned int
       flags, void * output_data, size_t * output_data_size);


       gnutls_x509_privkey_t key
                   Holds the key

       gnutls_x509_crt_fmt_t format
                   the format of output params. One of PEM or DER.

       const char * password
                   the password that will be used to encrypt the key.

       unsigned int flags
                   an ORed sequence of gnutls_pkcs_encrypt_flags_t

       void * output_data
                   will contain a private key PEM or DER encoded

       size_t * output_data_size
                   holds the size of output_data (and will be replaced by  the
                   actual size of parameters)


       This  function  will export the private key to a PKCS8 structure.  Both
       RSA and DSA keys  can  be  exported.  For  DSA  keys  we  use  PKCS  11
       definitions.  If  the  flags do not specify the encryption cipher, then
       the default 3DES (PBES2) will be used.

       The password can  be  either  ASCII  or  UTF-8  in  the  default  PBES2
       encryption schemas, or ASCII for the PKCS12 schemas.

       If  the  buffer  provided  is  not long enough to hold the output, then
       *output_data_size is updated and GNUTLS_E_SHORT_MEMORY_BUFFER  will  be

       If  the  structure  is  PEM  encoded,  it  will have a header of "BEGIN
       ENCRYPTED PRIVATE KEY" or "BEGIN PRIVATE  KEY"  if  encryption  is  not


       In case of failure a negative value will be returned, and 0 on success.


       Report   bugs   to    <>.     GnuTLS    home    page:  General  help  using GNU software:


       Copyright © 2008 Free Software Foundation.
       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.