MF2DL1000DA4SLASH02 datasheet(45/132 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

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10.3.4 Transaction MAC Calculation

10.3.4.1 Transaction MAC Initiation

A Transaction MAC calculation is initiated on transaction start, if the TransactionMAC

file is present. Next to this, a new Transaction MAC calculation is initiated each time a

transaction with ongoing Transaction MAC calculation is committed successfully with

CommitTransaction, or aborted, as described in Section 10.2.

Initiating a Transaction MAC calculation consists of the following steps:

• Set TMI to the empty byte string.

• Set TMRICur to the empty byte string.

Note that AbortTransaction can be used to exclude data read (ReadData, ReadRecords

or GetValue) from the Transaction MAC calculation if this data does not need to be

authenticated via the Transaction MAC toward the backend.

10.3.4.2 Transaction MAC Update

If the Transaction MAC Input TMI is still empty, the Transaction MAC Session Keys

(SesTMMACKey and SesTMENCKey), as defined in Section 10.3.2.3, are calculated.

Note that the calculation of SesTMENCKey may be delayed until CommitReaderID.

Once a Transaction MAC calculation is ongoing, the Transaction MAC Input TMI gets

updated on each following data manipulation command targeting a file of any file type

within the application, except TransactionMAC file itself.

The affected commands are listed below including the exact TMI updates. The following

holds for all commands:

ZeroPadding is the minimal number of zero bytes added such that the length of the TMI

up to and including the ZeroPadding is a multiple of 16 bytes. Note that this padding is

also added if this TMI update is not the last one before CommitTransaction.

Note that if executed while in not authenticated state (in case the access rights allow),

the command can be excluded from Transaction MAC processing, according to the

TransactionMAC configuration as can be done with ChangeFileSettings. In that case,

TMI is not updated at all.

Note that for each of these commands always the plain data are added, independently

from the actual communication settings and secure messaging (i.e. plain data without

any MAC, CRC, padding,. . . ). In case of command chaining, the chaining overhead is

ignored for the Transaction MAC computation. Data is the complete response data of all

frames with a total byte length of Length.

Except otherwise noted in the commands, all parameters are exactly as they appear on

the command interface.

If TMCLimit was reached, see Section 10.3.2.2, the command is rejected.

ReadData command TMI update

TMI = TMI || Cmd || FileNo || Offset || Length || ZeroPadding || Data ||

ZeroPadding

If Length is set to 000000h in the command, meaning that the whole file is read, the

actual length value is filled in with the number of bytes read for the Transaction MAC

calculation.

MF2DL1000DA4/02 Datasheet(PDF) 45 Page - NXP Semiconductors

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