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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURNS | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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gnutls_x509_crt_get_key_usage(3) gnutls gnutls_x509_crt_get_key_usage(3)
gnutls_x509_crt_get_key_usage - API function
#include <gnutls/x509.h>
int gnutls_x509_crt_get_key_usage(gnutls_x509_crt_t cert, unsigned
int * key_usage, unsigned int * critical);
gnutls_x509_crt_t cert
should contain a gnutls_x509_crt_t type
unsigned int * key_usage
where the key usage bits will be stored
unsigned int * critical
will be non-zero if the extension is marked as
critical
This function will return certificate's key usage, by reading the
keyUsage X.509 extension (2.5.29.15). The key usage value will
ORed values of the: GNUTLS_KEY_DIGITAL_SIGNATURE,
GNUTLS_KEY_NON_REPUDIATION, GNUTLS_KEY_KEY_ENCIPHERMENT,
GNUTLS_KEY_DATA_ENCIPHERMENT, GNUTLS_KEY_KEY_AGREEMENT,
GNUTLS_KEY_KEY_CERT_SIGN, GNUTLS_KEY_CRL_SIGN,
GNUTLS_KEY_ENCIPHER_ONLY, GNUTLS_KEY_DECIPHER_ONLY.
zero on success, or a negative error code in case of parsing
error. If the certificate does not contain the keyUsage extension
GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.
Report bugs to <[email protected]>.
Home page: https://www.gnutls.org
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.
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/
This page is part of the GnuTLS (GnuTLS Transport Layer Security
Library) project. Information about the project can be found at
⟨http://www.gnutls.org/⟩. If you have a bug report for this
manual page, send it to [email protected]. This page was obtained
from the tarball fetched from
⟨https://www.gnupg.org/ftp/gcrypt/gnutls/⟩ on 2025-08-11. If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for the
page, or you have corrections or improvements to the information
in this COLOPHON (which is not part of the original manual page),
send a mail to [email protected]
gnutls 3.8.10 gnutls_x509_crt_get_key_usage(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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