+ <method name="EncryptPassphrase">
+ <arg type="s" name="passphrase" direction="in"/>
+ <arg type="s" name="enc_data" direction="out"/>
+ </method>
+ <method name="DecryptPassphrase">
+ <arg type="s" name="enc_data" direction="in"/>
+ <arg type="s" name="passphrase" direction="out"/>
+ </method>