ATECC508A datasheet(62/109 Pages) MICROCHIP

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Table 9-10. Input Parameters

Name

Size

Notes

Opcode CheckMac

0x28

Param1

Mode

Bits 7–3: Must be zero.

Bit 2:

If Mode<0> or Mode<1> are set, then the value of this bit must match the

value in TempKey.SourceFlag or the command will return an error.

Bit 1:

0 = Use Slot<KeyID> in first SHA block.

1 = Use TempKey.

Bit 0:

0 = The second 32 bytes of the SHA message are taken from the input

ClientChal parameter.

1 = The second 32 bytes of the message are taken from TempKey.

Param2

KeyID

The internal key is to be used to generate the response. All except bits KeyID<3:0> are

ignored.

Data1

ClientChal

Challenge sent to client. If Mode<0> is one, then the value of this parameter will be

ignored. (These 32 bytes must still appear in the input stream).

Data2

ClientResp

Response generated by the client.

Data3

OtherData

Remaining constant data needed for response calculation.

Table 9-11. Output Parameter

Name Size

Notes

Result

Returns a single byte with a value of zero if ClientResp matches the internally computed digest; value

of one if there is a mismatch.

The message that will be hashed with the SHA-256 algorithm consists of the following information:

32 bytes

Slot<KeyID> or TempKey (depending on mode)

32 bytes

ClientChal or TempKey (depending on mode)

4 bytes

OtherData<0:3>

8 bytes

Zeros

3 bytes

OtherData<4:6>

1 byte

SN<8>

4 bytes

OtherData<7:10>

2 bytes

SN<0:1>

2 bytes

OtherData<11:12>

9.3

Counter Command

The Counter command reads the binary count value from one of the two monotonic counters located on

the device within the configuration zone. The maximum value that the counter may have is 2,097,151.

Any attempt to count beyond this value will result in an error code. The counter is designed to never lose

ATECC508A

Security Commands

Datasheet Complete

DS20005927A-page 62

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