Defines Java API for credential import extension as defined in the
GSS-API Extensions document.
Some of the functions might not specify all the parameters as in the document.
option - The import type. The import type must be the same as the
option used to export the buffer.
lifetime - The number of seconds that credentials should remain valid. Use
GSSCredential.INDEFINITE_LIFETIME to request that the credentials have
the maximum permitted lifetime. Use GSSCredential.DEFAULT_LIFETIME to request
default credential lifetime.
mech - The desired mechanism for the imported credential, may be null to indicate system default.
usage - The intended usage for this credential object. The value of this parameter must be one of:
GSSCredential.INITIATE_AND_ACCEPT, GSSCredential.ACCEPT_ONLY, and GSSCredential.INITIATE_ONLY.
Throws:
GSSException - containing the following major error codes: GSSException.BAD_MECH,
GSSException.DEFECTIVE_TOKEN, GSSException.NO_CRED, GSSException.CREDENTIAL_EXPIRED,
GSSException.FAILURE