+/**\r
+ This function fills the CHAP authentication information into the login PDU\r
+ during the security negotiation stage in the iSCSI connection login.\r
+\r
+ @param Conn[in] The iSCSI connection.\r
+\r
+ @param Pdu[in] The PDU to send out.\r
+\r
+ @retval EFI_SUCCESS All check passed and the phase-related CHAP\r
+ authentication info is filled into the iSCSI PDU.\r
+\r
+ @retval EFI_OUT_OF_RESOURCES Failed to allocate memory.\r
+\r
+ @retval EFI_PROTOCOL_ERROR Some kind of protocol error happend.\r
+\r
+**/\r