P5DF081 datasheet(14/36 Pages) NXP

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P5DF081_SDS

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Objective short data sheet

PUBLIC

Rev. 1 — 12 August 2010

191710

14 of 36

NXP Semiconductors

P5DF081

MIFARE SAM AV2

SAM_IsoGetChallenge/

SAM_GetRandom

AV1 compatibility mode

In AV1 compatibility mode, this is the first part of an ISO compliant authentication sequence

returning a random number. The command can obviously also be used for simply generating a

random number but it has to be taken into account that the MIFARE SAM AV2 internally is set into

a state indicating that an authentication procedure is ongoing, if the requested random number

length is 8 byte or 16 byte. Consequently, the command called after getting the random number

will be aborted (except SAM_IsoExternalAuthenticate). After this abortion the MIFARE SAM AV2

resets its state and returns to normal operation.

For a complete and valid authentication procedure, the three commands SAM_IsoGetChallenge,

SAM_IsoExternalAuthenticate and SAM_IsoInternalAuthenticate have to be called in sequence

without interrupting the sequence by another command.

AV2 mode

In AV2 mode, this command is only available to get random numbers. In this case, there are no

special constraints on the expected length for the challenge.

SAM_IsoExternalAuthen

ticate

This command is part of an ISO compliant authentication procedure consisting of

SAM_IsoGetChallenge, SAM_IsoExternalAuthenticate and SAM_IsoInternalAuthenticate. It can

be used by a host for authenticating the MIFARE SAM AV2.

Note that this command is only available in AV1 compatibility mode.

Such an authentication proves that both the MIFARE SAM AV2 and the host contain the same

secret, namely a DES, TDEA or AES key, and generates a session key for further cryptographic

operations.

SAM_IsoInternalAuthent

icate

This command is part of an ISO compliant authentication procedure consisting of

SAM_IsoGetChallenge, SAM_IsoExternalAuthenticate and SAM_IsoInternalAuthenticate. It can

be used by a host for authenticating the MIFARE SAM AV2.

Note that this command is only available in AV1 compatibility mode.

Such an authentication proves that both the MIFARE SAM AV2 and the host contain the same

secret, namely a DES, TDEA or AES key, and generates a session key for further cryptographic

operations.

SAM_GetVersion

The SAM_GetVersion command returns manufacturing related data of the MIFARE SAM AV2.

The SAM_GetVersion command can be used to detect whether a SAM has been switched to the

MIFARE SAM AV2 mode.

SAM_Sleep

Will force the MIFARE SAM AV2 to put a connected RC222 into sleep mode and itself into idle

mode to reduce power consumption.

The MIFARE SAM AV2 will answer the command and afterwards switch to idle mode.

The MIFARE SAM AV2 will automatically return to normal operation after receiving the first

character of the next command. The RC222 will stay in sleep mode until a command is issued

which utilizes the reader IC. Then the MIFARE SAM AV2 automatically carries out the wake-up

sequence before starting the requested operation.

Table 6.

SAM security and configuration commands …continued

Command

Description

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