ATECC508A datasheet(78/109 Pages) MICROCHIP

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Input. If operated in this mode and with a repeated input number value, the device provides no protection

against replay attacks.

Prior to the configuration zone being locked, the RNG produces a value of 0xFF FF 00 00 FF FF 00

00 to facilitate testing. This test value is combined with the input value in the manner described above.

Table 9-35. Input Parameters

Name

Size

Notes

Opcode NONCE

0x16

Param1

Mode

Controls the mechanism of the internal RNG and seed update.

Param2

Zero

Bit 15:

0 = OutData is either the output of the RNG or a single byte of zero.

1= RandOut is replaced by TempKey in both the hash calculation input

(message) and the command output parameter.

Bits 14-0: Must be zero

Data

NumIn 20, 32 Input value from system.

Table 9-36. Output Parameter

Name

Size

Notes

OutData 1 or 32 The output of the RNG, calculated nonce or a single byte with a value of zero if Mode<0:1> is

three.

If Mode<1:0> is 0b00 or 0b01 and Param2<15> is zero, then the input NumIn parameter must be 20

bytes long and the SHA-256 message body used to create the nonce stored internally in TempKey

consists of the following. Upon completion of the command, TempKey.SourceFlag is set to Rand. If

Mode<1:0> is 0b01, the automatic random number seed update is suppressed. See Section Random

Number Generator (RNG).

32 bytes

RandOut

20 bytes

NumIn from input stream

1 byte

Opcode (always 0x16)

1 byte

Mode

1 byte

LSB of Param2 (should always be 0x00)

If Mode<1:0> is 0b00 or 0b01 and Param2<15> is one, then the input NumIn parameter must be 20

bytes long and the SHA-256 message body used to create the nonce stored internally in TempKey

consists of the following. TempKey must be valid prior to execution of this command and the values of the

remaining TempKey flags remain unchanged.

32 bytes

TempKey

20 bytes

NumIn from input stream

1 byte

Opcode (always 0x16)

1 byte

Mode

1 byte

LSB of Param2 (should always be 0x00)

ATECC508A

Security Commands

Datasheet Complete

DS20005927A-page 78

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