MF2DL1000DA4SLASH02 datasheet(44/132 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

44 / 132

• TMRIPrev: the ReaderID of the latest successful transaction. On successful execution

of CommitTransaction, TMRICur is stored on the PICC as TMRIPrev

During the next transaction, the TMRIPrev is returned encrypted using SesTMENCKey.

This is done via the EncTMRI parameter in the response of the CommitReaderID:

EncTMRI = ETM(SesTMENCKey, TMRIPrev)

using the AES block cipher according to the CBC mode of NIST SP800-38A [5] without

adding any padding. The zero byte IV is applied, i.e. 128 bits of 0.

The initial TMRIPrev, as configured during creation of the TransactionMAC, is set to all

zero bytes, see Section 11.7.6.

Note that even if the application is configured for LRP, standard AES encryption is used

for the EncTMRI calculation. LRP is only used for the session key generation. The exact

specification of the TMRI is out of scope for this document, but an example can be the 7-

byte SAM UID with padding.

10.3.3 Transaction MAC Enabling

For MF2DL(H)x0, the Transaction MAC feature is enabled by default due to the existence

of the TransactionMAC file. The Transaction MAC feature can be disabled for an

application by deleting the TransactionMAC file with DeleteTransactionMACFile. The

Transaction MAC feature can be re-enabled by creating the TransactionMAC file again

with CreateTransactionMACFile, see Section 11.7.6.

As soon as the Transaction MAC feature is enabled for a selected application, the

Transaction MAC will be calculated, as specified in the next section, for every transaction

within the currently selected application, starting with the next transaction.

MF2DL(H)x0 supports additional Transaction MAC-related configuration options which

can be set via ChangeFileSettings:

• enabling a Transaction MAC counter limit TMCLimit.

• excluding unauthenticated operations from Transaction MAC calculation.

The AppTransactionMACKey is not an application key. Instead it is fully specified and

set by the CreateTransactionMACFile. Therefore, if this key needs to be changed, the

TransactionMAC file needs to be deleted and re-created. Notice that by doing this, the

TMC is also reset to zero.

Note that for MF2DL(H)x0 it is highly recommended to delete the initial

TransactionMAC file and re-create a new TransactionMAC file using a confidential

AppTransactionMACKey.

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