Features / packages and corresponding usages
The Calypso transaction API provides a high-level of abstraction to define functional commands to manage a secure session with a Calypso Portable Object, to update or authenticate its data.
The transaction API is defined on a low-level Calypso commands API which contains the builders of PO and SAM APDU commands, and the corresponding parsers of APDU responses. This internal library is deprecated, and will be refactorized for the version 2.0.0 of Keyple Calypso.
|org.eclipse.keyple.calypso.transaction||high||Calypso Portable Object commands and secure transaction management
|low||Calypso PO & SAM APDU commands' sets
Ticketing terminal applications must import only the high-level Calypso transaction package.
Calypso Portable Object Selection
Compared to the generic Card Selection API (cf. https://keyple.org/learn/architecture/keyple-core/#card-selection), a PO Selector could be defined to accept only non-invalidated Portable Object (in this cas an invalidated PO isn’t selected).
In addition, a PO Selection Request provides methods:
- to prepare Select File command (useful in particular to manage REV1 Calypso PO for which the select of the targeted DF is required).
- and to prepare simple read record command (useful to optimize the read of a file present on all targeted PO).
The matching SmartCard resulting from a PO Selection Request is a Calypso PO. In case file records have been read during the selection: the corresponding data could be recovered in the Calypso PO card image.
Calypso Portable Object Transaction
A Card Resource is a set of a Reader and a selected Card application.
- A Calypso Portable Object is the image of a selected Calypso PO.
- A Calypso SAM is the image of a selected Calypso SAM.
To operate a Calypso transaction:
- At least a Calypso Resource (CardResource<CalypsoPo>) is required.
- A SAM Resource ((CardResource<CalypsoSam>) is required too if security features are involved (Calypso secure session, Stored value transaction, PIN encryption, etc…).
A Calypso PO image provides public getters in order to recover the information of the selected PO (startup data, file data, … etc).
A transaction with a Calypso PO is fully managed through the PoTransaction object:
- First a set of PO commands could be defined through prepare commands.
- Next the prepared PO commands transmitted when operating a process command.
- The responses of the PO are then recovered through the Calypso PO image.
Calypso card image
When read commands have been exchanged with a Calypso PO, the corresponding data could be recovered by parsing the file structure of the PO card image.
Only the process methods generate communication with the Calypso PO and SAM.
- processPoCommands is used to transmit a set of prepared PO commands (outside or inside a secure session).
- processOpening issues an Open Secure Session followed by the prepared PO commands.
- processClosing issues the last prepared PO commands and transmits a Close Secure Session.
The prepareReleaseChannel method allows to the logical channel with the Calypso PO at the end of the processing of the next process method.