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gnutls_privkey_import_ext4(3)	    gnutls	 gnutls_privkey_import_ext4(3)

NAME
       gnutls_privkey_import_ext4 - API	function

SYNOPSIS
       #include	<gnutls/abstract.h>

       int  gnutls_privkey_import_ext4(gnutls_privkey_t	pkey, void * userdata,
       gnutls_privkey_sign_data_func				 sign_data_fn,
       gnutls_privkey_sign_hash_func sign_hash_fn, gnutls_privkey_decrypt_func
       decrypt_fn,	      gnutls_privkey_deinit_func	    deinit_fn,
       gnutls_privkey_info_func	info_fn, unsigned int flags);

ARGUMENTS
       gnutls_privkey_t	pkey
		   The private key

       void * userdata
		   private data	to be provided to the callbacks

       gnutls_privkey_sign_data_func sign_data_fn
		   callback for	signature operations (may be NULL)

       gnutls_privkey_sign_hash_func sign_hash_fn
		   callback for	signature operations (may be NULL)

       gnutls_privkey_decrypt_func decrypt_fn
		   callback for	decryption operations (may be NULL)

       gnutls_privkey_deinit_func deinit_fn
		   a deinitialization function

       gnutls_privkey_info_func	info_fn
		   returns info	about the public key algorithm (should not  be
		   NULL)

       unsigned	int flags
		   Flags for the import

DESCRIPTION
       This   function	 will	associate   the	  given	  callbacks  with  the
       gnutls_privkey_t	type. At least one of the callbacks must be  non-null.
       If  a  deinitialization	function  is provided then flags is assumed to
       contain GNUTLS_PRIVKEY_IMPORT_AUTO_RELEASE.

       Note that in contrast with the signing function	of  gnutls_privkey_im-
       port_ext3(),  the  signing functions provided to	this function take ex-
       plicitly	the signature algorithm	as parameter and  different  functions
       are provided to sign the	data and hashes.

       The  sign_hash_fn is to be called to sign pre-hashed data. The input to
       the  callback  is the output of the hash	(such as SHA256) corresponding
       to the signature	algorithm. For RSA PKCS1 signatures, the signature al-
       gorithm can be set to GNUTLS_SIGN_RSA_RAW, and in that  case  the  data
       should be handled as if they were an RSA	PKCS1 DigestInfo structure.

       The   sign_data_fn is to	be called to sign data.	The input data will be
       he data to be signed (and hashed), with the  provided  signature	 algo-
       rithm.  This  function  is  to  be  used	 for signature algorithms like
       Ed25519 which cannot take pre-hashed data as input.

       When both  sign_data_fn and  sign_hash_fn functions are	provided  they
       must  be	able to	operate	on all the supported signature algorithms, un-
       less prohibited by the type of the algorithm (e.g., as with Ed25519).

       The  info_fn must provide information on	the signature algorithms  sup-
       ported	by   this   private   key,   and   should  support  the	 flags
       GNUTLS_PRIVKEY_INFO_PK_ALGO,   GNUTLS_PRIVKEY_INFO_HAVE_SIGN_ALGO   and
       GNUTLS_PRIVKEY_INFO_PK_ALGO_BITS.  It must return -1 on unknown flags.

RETURNS
       On  success, GNUTLS_E_SUCCESS (0) is returned, otherwise	a negative er-
       ror value.

SINCE
       3.6.0

REPORTING BUGS
       Report bugs to <bugs@gnutls.org>.
       Home page: https://www.gnutls.org

COPYRIGHT
       Copyright (C) 2001-2023 Free Software Foundation, Inc., and others.
       Copying and distribution	of this	file, with  or	without	 modification,
       are  permitted in any medium without royalty provided the copyright no-
       tice and	this notice are	preserved.

SEE ALSO
       The full	documentation for gnutls is maintained as  a  Texinfo  manual.
       If the /usr/local/share/doc/gnutls/ directory does not contain the HTML
       form visit

       https://www.gnutls.org/manual/

gnutls				     3.8.9	 gnutls_privkey_import_ext4(3)

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