NAME

       gnutls_pubkey_get_preferred_hash_algorithm - API function

SYNOPSIS

       #include <gnutls/abstract.h>

       int             gnutls_pubkey_get_preferred_hash_algorithm(gnutls_pubkey_t            key,
       gnutls_digest_algorithm_t * hash, unsigned int * mand);

ARGUMENTS

       gnutls_pubkey_t key
                   Holds the certificate

       gnutls_digest_algorithm_t * hash
                   The result of the call with the hash algorithm used for signature

       unsigned int * mand
                   If non zero it means that the algorithm MUST use this hash. May be NULL.

DESCRIPTION

       This function will read the certificate and return the appropriate digest algorithm to use
       for  signing with this certificate. Some certificates (i.e.  DSA might not be able to sign
       without the preferred algorithm).

       To get the signature algorithm instead of just the hash use gnutls_pk_to_sign()  with  the
       algorithm of the certificate/key and the provided  hash .

RETURNS

       the 0 if the hash algorithm is found. A negative error code is returned on error.

SINCE

       2.12.0

REPORTING BUGS

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

COPYRIGHT

       Copyright © 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 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/