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MF2DLX0 Datasheet(PDF) 24 Page - NXP Semiconductors |
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MF2DLX0 Datasheet(HTML) 24 Page - NXP Semiconductors |
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24 / 132 page  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. © NXP B.V. 2019. All rights reserved. Product data sheet Rev. 3.3 — 5 April 2019 COMPANY PUBLIC 430733 24 / 132 between standard AES authentication and LRP authentication based on the message length. On First Authentication, the PCD can choose between AES and LRP secure messaging by setting bit 1 of PCDCap2.1 in the issued command. The PD is configured for either AES or LRP secure messaging by the setting of bit 1 from PDCap2.1. This setting is defined with SetConfiguration, see Section 11.5.1. If the PCD chooses for AES secure messaging, it sends PCDCap2.1 equaling 00h (or no PCDCap2 at all). A MF2DL(H)x0 will accept the authentication if its PDCap2.1 bit 1 is not set, i.e. the MF2DL(H)x0 is configured for AES secure messaging. The command is interpreted as AuthenticateEV2First, see Section 9.1.5 for detailed specification. If PDCap2.1 bit 1 is set, i.e. the MF2DL(H)x0 is configured for LRP secure messaging, the authentication request is rejected. If the PCD chooses for LRP secure messaging, it sends PCDCap2.1 equaling 02h. MIFARE DESFire Light will accept the authentication if its PDCap2.1 bit 1 is set, i.e. the MF2DL(H)x0 is configured for LRP secure messaging. The command is interpreted as AuthenticateLRPFirst and replied with 18 bytes, i.e. ADDITIONAL_FRAME, followed by an additional AuthMode indicating LRP secure messaging, and 16 bytes of data, see Section 11.4.3 for detailed specification. If PDCap2.1 bit 1 is not set, i.e. the MF2DL(H)x0 is configured for AES secure messaging, the authentication request is also accepted, but responded with 17 bytes, i.e. the AuthenticateEV2First response composed of ADDITIONAL_FRAME, followed by 16 bytes of data, allowing the PCD to fall back to standard AES authentication as well. With Non-First Authentication, the PCD cannot choose between standard AES and LRP. If authenticated using AES mode, AuthenticateEV2NonFirst will be applied, see Section 9.1.6. If authenticated with LRP mode, AuthenticateLRPNonFirst will be applied, see Section 11.4.4. If not authenticated at all, e.g. if targeting one of the originality keys, only AuthenticateLRPNonFirst is supported. Below table provides possible negotiation outcomes on FirstAuthentication. Table 18. Secure messaging mode negotiation PCD PD Mode PCDCa p2.1 PDCap2.1 (Mode) RC resp PDCap2.1 resp PCDCap2.1 comment 00h (AES) ADDITIONAL_ FRAME: 17-byte response without AuthMode 00h 00h Matching, AES SM accepted and selected Requesting EV2 Secure Messaging 00h 02h (LRP) PERMISSION_ DENIED N/A N/A No match, AES SM rejected 00h (AES) ADDITIONAL_ FRAME 00h 02h No match, PD replies with AES response, allowing a PCD to fall back. Requesting LRP Secure Messaging 02h 02h (LRP) ADDITIONAL_ FRAME: 18-byte response with AuthMode set to 01h 02h 02h Matching, LRP SM accepted and selected |
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