MF2DL1000DA4SLASH02 datasheet(37/132 Pages) NXP

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NXP Semiconductors

MF2DL(H)x0

MIFARE DESFire Light contactless application IC

MF2DL_H_x0

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.3 — 5 April 2019

COMPANY PUBLIC

430733

37 / 132

10 Transaction Management

MIFARE DESFire Light supports the grouping of data management operations into

transactions. This allows for committing or aborting all previous write access to files

with integrated backup mechanisms within the selected application via a single atomic

operation.

How a transaction can be initiated and concluded, is detailed in Section 10.1 and

Section 10.2. On top of this, MF2DL(H)x0 supports a Transaction MAC feature which

allows proofing transaction execution toward a third party. This feature can be used if,

for example, a merchant needs to be reimbursed by a backend for the transaction he

executed. This way the backend is protected against the fraudulent merchant scenario.

The Transaction MAC feature is specified in Section 10.3.

10.1 Transaction Initiation

MF2DL(H)x0 does not provide a separate command for initiating a transaction. Instead, a

transaction is started by selecting the application with a ISOSelectFile command.

Next to this, a new transaction is also automatically initiated after conclusion of a

previous transaction, see Section 10.2.

Note that a transaction is not affected by the execution of an authentication. One can

have several authentications during the course of a single transaction.

10.2 Transaction Conclusion

A transaction can be concluded by successfully committing all write operations on

backup files, as detailed in Section 10.2.1, or by abortion which will cancel all changes,

as detailed in Section 10.2.2. For both operations, MF2DL(H)x0 supports a specific

command, but transaction abortion can also be triggered by other commands.

Note that some of the parameters and actions triggered by these commands are related

with the Transaction MAC feature, explained in Section 10.3. For a full understanding,

the description in that section should be referred to.

10.2.1 CommitTransaction

Validating all previous write access to back up files within the currently selected

application is possible with the command CommitTransaction as defined in

Section 11.9.1.

The CommitTransaction takes an optional parameter option, which indicates if the

Transaction MAC Counter (TMC) and Transaction MAC Value (TMV) of the calculated

Transaction MAC, see Section 10.3, are to be sent with the response. If this is requested

while the selected application does not support Transaction MAC calculation, i.e. no

TransactionMAC file is present, the command is rejected.

The CommitTransaction validates all preceding write access of the ongoing transaction to

files with integrated backup mechanisms:

• Value file

• CyclicRecord file

If the Transaction MAC feature is enabled, the TransactionMAC file is updated if the

Transaction MAC Input (TMI) is different from the empty string. The updated file holds the

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