gnutls_x509_crt_get_key_id(3)

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: 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/