gnutls_x509_crt_get_key_id(3) — Linux manual page


gnutls_x509_crt_get_key_id(3)      gnutls      gnutls_x509_crt_get_key_id(3)

NAME         top

       gnutls_x509_crt_get_key_id - API function

SYNOPSIS         top

       #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         top

       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         top

       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         top

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

REPORTING BUGS         top

       Report bugs to <>.
       Home page:

COPYRIGHT         top

       Copyright © 2001-2019 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-3.6.9.tar.xz fetched from
       ⟨⟩ on 2020-09-18.  If you discover
       any rendering problems in this HTML version of the page, or you
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gnutls                              3.6.9      gnutls_x509_crt_get_key_id(3)