NAME

       gnutls_x509_crt_get_key_id - API function

SYNOPSIS

       #include <gnutls/x509.h>

       int  gnutls_x509_crt_get_key_id(gnutls_x509_crt_t crt, unsigned int flags, unsigned char *
       output_data, size_t * output_data_size);

ARGUMENTS

       gnutls_x509_crt_t crt
                   Holds the certificate

       unsigned int flags
                   should be one of the flags from gnutls_keyid_flags_t

       unsigned char * output_data
                   will contain the key ID

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

DESCRIPTION

       This  function  will return a unique ID that depends on the public key parameters. This ID
       can be used in checking whether a certificate corresponds to the given private key.

       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 returned.  The output will normally be a
       SHA-1 hash output, which is 20 bytes.

RETURNS

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

REPORTING BUGS

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

COPYRIGHT

       Copyright © 2001-2021 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

       http://www.gnutls.org/manual/