gnutls_x509_privkey_sign_data(3)   gnutls   gnutls_x509_privkey_sign_data(3)

NAME         top

       gnutls_x509_privkey_sign_data - API function

SYNOPSIS         top

       #include <gnutls/x509.h>

       int gnutls_x509_privkey_sign_data(gnutls_x509_privkey_t key,
       gnutls_digest_algorithm_t digest, unsigned int flags, const
       gnutls_datum_t * data, void * signature, size_t * signature_size);

ARGUMENTS         top

       gnutls_x509_privkey_t key
                   a key

       gnutls_digest_algorithm_t digest
                   should be a digest algorithm

       unsigned int flags
                   should be 0 for now

       const gnutls_datum_t * data
                   holds the data to be signed

       void * signature
                   will contain the signature

       size_t * signature_size
                   holds the size of signature (and will be replaced by the
                   new size)

DESCRIPTION         top

       This function will sign the given data using a signature algorithm
       supported by the private key. Signature algorithms are always used
       together with a hash functions.  Different hash functions may be used
       for the RSA algorithm, but only SHA-1 for the DSA keys.

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

       Use gnutls_x509_crt_get_preferred_hash_algorithm() to determine the
       hash algorithm.

RETURNS         top

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

REPORTING BUGS         top

       Report bugs to <>.
       Home page:

COPYRIGHT         top

       Copyright © 2001-2017 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         top

       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 

COLOPHON         top

       This page is part of the GnuTLS (GnuTLS Transport Layer Security
       Library) project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
       tarball gnutls-3.6.1.tar.xz fetched from
       ⟨⟩ on 2018-02-02.  If you discover
       any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

gnutls                              3.6.1   gnutls_x509_privkey_sign_data(3)