P5DF081 datasheet(17/36 Pages) NXP

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P5DF081_SDS

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Objective short data sheet

PUBLIC

Rev. 1 — 12 August 2010

191710

17 of 36

NXP Semiconductors

P5DF081

MIFARE SAM AV2

SAM_Verify_MAC

The SAM_Verify_MAC command verifies the MAC which was sent by the DESFire PICC or any

other system based on the given MACed plain text data and the currently valid cryptographic key.

The valid key has been activated using a valid PICC authentication (SAM_AuthenticatePICC,

SAM_ISOAuthenticatePICC) in case of a PICC Key or using a valid key activation

(SAM_ActivateOfflineKey) in case of an OfflineCrypto Key.

The applied MAC algorithm depends on the key type. In case of the AES key types and the

(3)DES key types 3 and 6, the standard CMAC algorithm is applied.

SAM_Generate_MAC

The SAM_Generate_MAC command creates a MAC which is meant to be sent to the DESFire

PICC or any other system based on the given plain text data and the currently valid cryptographic

key. The valid key has been activated using a valid PICC authentication (SAM_AuthenticatePICC,

SAM_ISOAuthenticatePICC) in case of a PICC Key or using a valid key activation

(SAM_ActivateOfflineKey) in case of an OfflineCrypto Key.

The applied MAC algorithm depends on the key type. In case of the AES key types and the

(3)DES key types 3 and 6, the standard CMAC algorithm is applied.

SAM_Decipher_Data

Same operation as in MIFARE SAM AV1 compatibility mode performed with either a

valid PICC authentication (SAM_AuthenticatePICC, SAM_ISOAuthenticatePICC or

SAM_AuthenticateMIFARE) in case of a PICC Key or a valid key activation

(SAM_ActivateOfflineKey) in case of an OfflineCrypto Key.

SAM_Encipher_Data

Same operation as in AV1 compatibility mode and same description.

SAM_DecipherOffline_

Data

The new SAM_DecipherOffline_Data command decrypts data received from any other system

based on the given cipher text data and the currently valid cryptographic OfflineCrypto Key. The

valid key has been activated using a valid key activation (SAM_ActivateOfflineKey).

The applied decryption is the block cipher algorithm depending on the key type in CBC mode. The

IV needs to be loaded via the SAM_LoadInitVector command before issuing this command. If no

IV was loaded, the zero byte IV is applied. No padding is removed from the decrypted plain text, so

the output length equals the input length.

The total input size must be a multiple of the block size of the underlying block cipher (depending

on the key type). In case of command chaining, the SAM immediately starts returning decrypted

data for the received blocks.

The new SAM_EncipherOffline_Data command encrypts data received from any other system

based on the given cipher text data and the currently valid cryptographic OfflineCrypto Key. The

valid key has been activated using a valid key activation (SAM_ActivateOfflineKey).

The applied decryption is the block cipher algorithm depending on the key type in CBC mode. The

IV needs to be loaded via the SAM_LoadInitVector command before issuing this command. If no

IV was loaded, the zero byte IV is applied. No padding is added to the plain text, so the output

length equals the input length.

As a consequence, the total input size must be a multiple of the block size of the underlying block

cipher (depending on the key type). In case of command chaining, the SAM immediately starts

returning encrypted data for the received blocks.

Table 8.

Data processing commands …continued

Command

Description

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