Citrix Systems 9.2 Benutzerhandbuch

certificate.
KEY_USAGE(string)

Returns a Boolean value to indicate whether the 
specified key usage extension bit value in the 
X.509 certificate is set. The string argument 
specifies which bit is checked. Following are valid 
arguments:

• DIGITAL_SIGNATURE. Returns TRUE if 

the digital signature bit is set; otherwise, it 
returns FALSE.

• NONREPUDIATION. Returns TRUE if the 

nonrepudiation bit is set; otherwise, it returns 
FALSE.

• KEYENCIPHERMENT. Returns TRUE if the 

key encipherment bit is set; otherwise, it 
returns FALSE.

• DATAENCIPHERMENT. Returns TRUE if the 

data encipherment bit is set; otherwise, it 
returns FALSE.

• KEYAGREEMENT. Returns TRUE if the key 

agreement bit is set; otherwise, it returns 
FALSE.

• KEYCERTSIGN. Returns TRUE if the key cert 

sign bit is set; otherwise, it returns FALSE.

• CRLSIGN. Returns TRUE if the CRL bit is 

set; otherwise, it returns FALSE.

• ENCIPHERONLY. Returns TRUE if the 

encipher only bit is set; otherwise, it returns 
FALSE.

• DECIPHERONLY. Returns TRUE if the 

decipher only bit is set; otherwise, it returns 
FALSE.

certificate.PK_ALGORITHM

Returns the name of the public key algorithm used 
by the certificate.

certificate.PK_SIZE

Returns the size of the public key used in the 
certificate.

certificate.SERIALNUMBER

Returns the serial number of the client certificate. 
If this is a non-SSL transaction or there is an error 
in the certificate, this operation returns an empty 
string.

certificate.
SIGNATURE_ALGORITHM

Returns the name of the cryptographic algorithm 
used by the CA to sign this certificate.