NAME

       gnutls_privkey_sign_hash2 - API function

SYNOPSIS

       #include <gnutls/abstract.h>

       int   gnutls_privkey_sign_hash2(gnutls_privkey_t   signer,  gnutls_sign_algorithm_t  algo,
       unsigned int flags, const gnutls_datum_t * hash_data, gnutls_datum_t * signature);

ARGUMENTS

       gnutls_privkey_t signer
                   Holds the signer's key

       gnutls_sign_algorithm_t algo
                   The signature algorithm used

       unsigned int flags
                   Zero or one of gnutls_privkey_flags_t

       const gnutls_datum_t * hash_data
                   holds the data to be signed

       gnutls_datum_t * signature
                   will contain newly allocated signature

DESCRIPTION

       This function will sign the given hashed data using  the  specified  signature  algorithm.
       This  function  is  an enhancement of gnutls_privkey_sign_hash(), as it allows utilizing a
       alternative signature algorithm where possible (e.g, use an RSA key with RSA-PSS).

       The flags may be GNUTLS_PRIVKEY_SIGN_FLAG_TLS1_RSA.   In  that  case  this  function  will
       ignore   hash_algo  and  perform  a raw PKCS1 signature.  Note that this flag is supported
       since 3.6.9.

       Note also that, not all algorithm support signing already hashed data. When  signing  with
       Ed25519, gnutls_privkey_sign_data2() should be used instead.

RETURNS

       On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.

SINCE

       3.6.0

REPORTING BUGS

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

COPYRIGHT

       Copyright © 2001- 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 notice and this notice are preserved.

SEE ALSO

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

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