Smart Cards and the Open Terminal Architecture

Smart Cards and the Open Terminal Architecture

By Edward K. Conklin

Dr. Dobb's Journal December 1998

:INIT-PURCHASE   ( S: -- )
 ( Initialize the purchase transaction. Perform all common steps for 
     online and offline transactions. )
 NEEDS-UPLOADING? ERR-DENIED ?THROW     \ Transaction log full ?
 LOAD-APPLICATION-DATA                  \ Load application data
 5 TRS-TRANSACTION-AMOUNT               \ Determine transaction amount
 EMV-INITIATE-APPLICATION               \ Initiate application on card
 EMV-PROCESS-COMPLETE?                  \ $9000 returned ?
 GET-CURRENT-BALANCE                    \ Get current balance from card
 MSG-BALANCE TRS-CONSTRUCT-CH-MESSAGE   \ Display balance for cardholder
 [ FLG-SECONDARY-DISPLAY ] [IF]
   MSG-PLEASE-WAIT TRS-CONSTRUCT-MRCH-MESSAGE   \ Ask merchant to wait
 [THEN]
 EMV-READ-APPLICATION-DATA              \ Read data from the card
 EMV-PROCESS-COMPLETE?                  \ $9000 returned ?
 ICC-PUBLIC-KEY-AUTH                    \ Authenticate ICC public key
 EMV-PROCESSING-RESTRICTIONS            \ Check restrictions
 TRS-CHECK-STATUS                       \ Check transaction has not                                                                 
                                        \       been canceled
;

Example 2: A sample OTA application.