AN2646 datasheet(24/43 Pages) STMICROELECTRONICS

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ISO 7816-4 – smartcard commands

AN2646 - Application note

24/43

Erase Binary

The Erase Binary command is used to clear bytes within a transparent EF on a card.

Similarly to the previous commands, the input parameters comprise an offset from the start

of the EF to the segment of bytes to be erased as well as the number of bytes to be erased.

Read Record

This command is used to read and return the contents of one or more records in an EF on a

card. Unlike the previous command, the EF for the Read Record command must be a

record-oriented file. If it is applied to a transparent EF, the command will abort and an error

will be returned to the reader.

The following may be returned from this command, depending on the input parameters:

●

A specified record

●

All the records from the beginning of the file to a specific record

●

All the records from a specific record to the end of the file

Write Record

This command is used to write a record into a record-oriented EF. As with the Write Binary

command, this command can be used to write a record into an EF, set or clear specific bits

within a specific record in an EF.

Append Record

The Append Record command is used to add a record to the end of a linear, record-oriented

EF or to write the first record to a cyclic, record-oriented EF on a card.

Update Record

This command writes a specific record into a record-oriented EF on a card. As with the

Update Binary command, the old record is erased and the new one is written into the EF.

Get Data

This command reads and returns the contents of a data object stored within the file system

on the card. The Get Data command is card-specific as the definition of a data object varies

between different cards.

Put Data

This command (as the name suggests) puts information into a data object on the card. As

with the previous command, this is a card-specific command.

5.2.4

Security API

Each component of the file system on a smartcard has an associated list of access

properties. The access properties ensure that only authorized parties are allowed to access

the particular component of the file system. The authentication can be simple, such as

requiring the reader to provide a predefined personal identification number (PIN).

Alternatively, it may be more complicated, such as requiring the reader to prove that it

possesses some shared secret with the card (for example a key) by encrypting or decrypting

a string of bytes provided by the card.

A few of the functions provided by the security API are briefly discussed below.

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