ATECC608A datasheet(47/81 Pages) MICROCHIP

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Table 5-57. AES-ECB Encrypt

Opcode

(1 Byte)

Mode

(1 Byte)

KeyID

(2 Bytes)

Data

(16 Bytes)

Comments

0x51

0x00

0x40

0x80

0xC0

0x00 0[Slot]

Any 16 bytes of ClearText data

Encrypt key in Position 0

Encrypt key in Position 1

Encrypt key in Position 2

Encrypt key in Position 3

0x00

0xFF FF

Any 16 bytes of ClearText data

Encryption key located in TempKey

Table 5-58. AES Encrypt Output Response

Name

Size (Bytes)

Notes

Response

If the operation fails, the ouptut is a one byte error code.

If the operation is successful, the device will output 16 bytes of encrypted text.

5.3.1.2

AES-GFM

The GFM operation is often used as part of various AES cryptographic operations. This function has been provided to

aid in the creation of operations that are not directly supported by the ATECC608A-TNGLoRaWAN. The output of this

operation can be used in the AES-GCM AEAD functionality. This mode does not involve secrets or anything stored

on the chip. If this mode is selected, the remaining mode bits are ignored.

Table 5-59. AES Galois FIeld Multiply (GFM)

Opcode

(1 Byte)

Mode

(1 Byte)

KeyID

(2 Bytes)

Data

(32 Bytes)

Description

0x51

0x03

0x00 00

• First 16 bytes - H-Field

• Second 16 bytes input data

Table 5-60. AES GFM Output Response

Name

Size (Bytes)

Notes

Response 1

If the operation fails, the output is a one-byte error code.

If the operation is successful, the device will output 16 bytes result of the GFM

calculation.

5.3.2

CheckMac Command

The CheckMac command calculates a MAC response that would have been generated on a different

CryptoAuthentication™ (ATECC608A, ATECC508A, ATSHA204A) device and then compares the result with the input

value. The command returns a boolean result to indicate the success or failure of the comparison.

If a value in TempKey is used as an input to the CheckMac, then a Nonce and/or GenDig command must be run

prior to the CheckMac command.

ATECC608A-TNGLoRaWAN

Device Commands

Complete Datasheet

DS40002154B-page 47

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