.\" DO NOT MODIFY THIS FILE!  It was generated by gdoc.
.TH "gnutls_pubkey_get_key_id" 3 "2.12.6.1" "gnutls" "gnutls"
.SH NAME
gnutls_pubkey_get_key_id \- API function
.SH SYNOPSIS
.B #include <gnutls/gnutls.h>
.sp
.BI "int gnutls_pubkey_get_key_id(gnutls_pubkey_t " key ", unsigned int " flags ", unsigned char * " output_data ", size_t * " output_data_size ");"
.SH ARGUMENTS
.IP "gnutls_pubkey_t key" 12
Holds the public key
.IP "unsigned int flags" 12
should be 0 for now
.IP "unsigned char * output_data" 12
will contain the key ID
.IP "size_t * output_data_size" 12
holds the size of output_data (and will be
replaced by the actual size of parameters)
.SH "DESCRIPTION"
This function will return a unique ID the depends on the public
key parameters. This ID can be used in checking whether a
certificate corresponds to the given public 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.
.SH "RETURN VALUE"
In case of failure a negative value will be
returned, and 0 on success.
.SH "REPORTING BUGS"
Report bugs to <bug-gnutls@gnu.org>.
GnuTLS home page: http://www.gnu.org/software/gnutls/
General help using GNU software: http://www.gnu.org/gethelp/
.SH COPYRIGHT
Copyright \(co 2008 Free Software Foundation.
.br
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.
.SH "SEE ALSO"
The full documentation for
.B gnutls
is maintained as a Texinfo manual.  If the
.B info
and
.B gnutls
programs are properly installed at your site, the command
.IP
.B info gnutls
.PP
should give you access to the complete manual.