ATECC608A datasheet(44/81 Pages) MICROCHIP

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Table 5-50. Command Parameters

Opcode

(1 Byte)

Mode

(1 Byte)

Key ID

(2 Bytes)

Data Field (128 Bytes)

Comment

Signature

(64 Bytes)

Public Key

(64 Bytes)

0x45

0x02

0x00 04

R value

S value

X value

Y value

Message stored in TempKey

0x22

0x00 04

R value

S value

X value

Y value

Message stored in Message Digest Buffer

0xA2

0x00 04

R value

S value

X value

Y value

• Message stored in TempKey

• System Nonce stored in MDB[31:0]

• Validation MAC is returned

0x82

0x00 04

R value

S value

X value

Y value

• Message stored in Message Digest Buffer

• System Nonce stored in MDB[63:32]

• Validation MAC is returned

Table 5-51. Output Response - Verify External

Name

Mode

Size

Response

Response 0x02 or 0x22

1 byte

• 0x00 - If signature is verified

• 0x01 - If signature does not match

• Error code - If there is a failure due to some other reason

0x82 or 0xA2

1 byte or 32 bytes

• Validation MAC - If signature is verified

• 0x01 - If signature does not match

• Error code - If there is a failure due to some other reason

Table 5-52. Validation MAC - Verify External

Size

(Bytes)

Message in TempKey

Message in Message Digest Buffer

Contents of the IO protection key

Message stored in TempKey

Message stored in the first 32 bytes of the Message

Digest Buffer

System Nonce stored in the first 32 bytes of the

Message Digest Buffer

System Nonce stored in the second 32 bytes of the

Message Digest Buffer

R Data of the passed signature

S Data of the passed signature

Opcode

Mode

Param2 [LSB,MSB]

5.2.4.2

Verify - Stored Public Key Mode

When using the Verify command in Stored mode, the public key to be used is stored in a data slot and does not

need to be passed. Prior to this command being run, the message should be written to TempKey or the Message

Digest Buffer using the Nonce command.

ATECC608A-TNGLoRaWAN

Device Commands

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