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gnutls_x509_crt_get_key_usage(3)     gnutls	gnutls_x509_crt_get_key_usage(3)

NAME
     gnutls_x509_crt_get_key_usage - API function

SYNOPSIS
     #include <gnutls/x509.h>

     int  gnutls_x509_crt_get_key_usage(gnutls_x509_crt_t  cert,  unsigned int *
     key_usage, unsigned int * critical);

ARGUMENTS
     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

DESCRIPTION
     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.

RETURNS
     zero on success, or a negative error code in case of parsing error.  If the
     certificate   does   not	contain   the  keyUsage  extension  GNUTLS_E_RE-
     QUESTED_DATA_NOT_AVAILABLE will be returned.

REPORTING BUGS
     Report bugs to <bugs@gnutls.org>.
     Home page: https://www.gnutls.org

COPYRIGHT
     Copyright (C) 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/local/share/doc/gnutls/	directory does not contain the HTML form
     visit

     https://www.gnutls.org/manual/

gnutls				     3.8.13	gnutls_x509_crt_get_key_usage(3)

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