gnutls_x509_crt_get_key_usage man page on aLinux

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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 - This function returns the certificate's
       key usage

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 structure

       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_REPUDIA‐
       TION,	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_DECI‐
       PHER_ONLY.

       A negative value may be returned in case of parsing error.  If the cer‐
       tificate	   does	    not	    contain	the	keyUsage     extension
       GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.

REPORTING BUGS
       Report bugs to <bug-gnutls@gnu.org>.

COPYRIGHT
       Copyright © 2004 Free Software Foundation.
       Permission  is  granted	to make and distribute verbatim copies of this
       manual provided the copyright notice and	 this  permission  notice  are
       preserved on all copies.

SEE ALSO
       The  full  documentation	 for gnutls is maintained as a Texinfo manual.
       If the info and gnutls programs are properly installed  at  your	 site,
       the command

	      info gnutls

       should give you access to the complete manual.

gnutls				     1.4.4    gnutls_x509_crt_get_key_usage(3)
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