MF2DLX0 datasheet(28/132 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

28 / 132

targeted key is the OriginalityKey. For the rest, the behavior is exactly the same as for

AuthenticateEV2First, except for the following differences:

• No PCDcap2 and PDcap2 are exchanged and validated.

• Transaction Identifier TI is not reset and not exchanged.

• Command Counter CmdCtr is not reset.

After successful authentication, the PICC remains in EV2 authenticated state. On any

failure during the protocol, the PICC ends up in not authenticated state.

9.1.7 Session Key Generation

At the end of a valid authentication with AuthenticateEV2First or

AuthenticateEV2NonFirst, both the PICC and the PCD generate two session keys for

secure messaging, as shown in Figure 7:

• SesAuthMACKey for MACing of messages

• SesAuthENCKey for encryption and decryption of messages

Note that these identifiers are also used in context of the LRP protocol, though the actual

calculation of the session keys is different, see Section 9.2.7.

aaa-032191

SesAuthENCKey = AES

Session Key for encryption

SesAuthMACKey = AES

Session Key for MAC

RndA

MIFARE DESFire Light Authentication

RndB

KDF

SesAuthENCKey = AES

Session Key for encryption

SesAuthMACKey = AES

Session Key for MAC

RndA

AES Key Kx

PICC

PCD

RndB

KDF

Figure 7. Session key generation for Secure Messaging

The session key generation is according to NIST SP 800-108 [8] in counter mode.

The Pseudo Random Function PRF(key; message) applied during the key generation

is the CMAC algorithm described in NIST Special Publication 800-38B [6]. The

key derivation key is the key Kx that was applied during authentication. As the

authentications are restricted to target AES keys, the generated session keys are also of

AES.

The input data is constructed using the following fields as defined by [8]. Note that NIST

SP 800-108 allows defining a different order than proposed by the standard as long as it

is unambiguously defined.

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