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77 / 133 page NXP Semiconductors NTP53x2 NTAG 5 link - NFC Forum-compliant I2C bridge NTP53x2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved. Product data sheet Rev. 3.3 — 3 July 2020 COMPANY PUBLIC 544533 77 / 133 • Mutual Authentication (MAM1, MAM2) After receiving a valid AUTHENTICATE command, NTAG 5 link calculates the response and as soon as the calculation is finalized, the response with the result of the crypto calculation (b3 flag is set) is sent. Only for tag authentication the calculation result is additionally stored in the response buffer (b2 flag is set). NTAG 5 link supports the Crypto Suite AES128 as defined in ISO/IEC 29167-10. Option_flag = 0b and Option_flag = 1b is supported and is in accordance with ISO/IEC 15693 write-alike commands. Table 156. AUTHENTICATE request format Flags AUTHENTICATE UID CSI Message CRC16 8 bits 8 bits 64 bits (optional) 8 bits Depending on TAM1 (96 bit), MAM1 (96 bit) or MAM2 (136 bit) 16 bits Table 157 defines the response of NTAG 5 link to an AUTHENTICATE command. For more detailed information, refer to ISO/IEC 29167-10. Table 157. AUTHENTICATE response format when Error_flag is NOT set(in process reply) Flags Barker Code TResponse CRC16 8 bits (b2 and b3 is set) 8 bits (Done flag is set) Depending on TAM1 (128 bit), MAM1(176 bit) or MAM2 (0 bit) 16 bits Table 158. AUTHENTICATE response format when Error_flag is set Flags Error Code CRC16 8 bits 8 bits 16 bits Tag Authentication (TAM1) Table 159 defines the message within the AUTHENTICATE command for tag authentication (TAM1). For more detailed information, refer to ISO/IEC 29167-10. Table 159. Message format for TAM1 AuthMethode CustomData TAM1_RFU KeyID IChallenge_TAM1 # of bits 2 1 5 8 80 Description 00b 0b 00000b [7:0] random interrogator challenge Table 160 defines the response of NTAG 5 link to an AUTHENTICATE command. For more detailed information, refer to ISO/IEC 29167-10. Table 160. TResponse for TAM1 TResponse TAM1 (128 bit) AES-ECB-ENC(Key[KeyID].ENC_key,C_TAM1[15:0] || TRnd_TAM1[31:0] || IChallenge_TAM1[79:0]) |
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