AT88SA10HS-TH-T データシートの表示（PDF） - Atmel Corporation

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AT88SA10HS-TH-T

Atmel CryptoAuthentication Host Security Chip

Atmel Corporation 

6.5 GenPersonalizationKey

Loads a personalization key into internal memory and then uses that key along with an input seed to generate a decryption

digest using SHA-256. Neither the key nor the decryption digest can be read from the chip. Upon completion, an internal bit is

set indicating that a secure personalization digest has been loaded and is ready to use by the BurnSecure command. This bit

is cleared (and the digest lost) when the watchdog timer expires or the power is cycled.

This command will fail if Fuse[87] has been burned.

Table 6-11. Input Parameters

Opcode

Param1

Param2

Data

Name

GenPers

Zero

KeyID

Seed

Size

1

1

2

16

Notes

0x20

Must be 0x00

Identification number of the personalization key to be loaded

Seed for digest generation. The least significant bit of the last byte is

ignored by AT88SA10HS

Table 6-12. Output Parameters

Name

Success

Size

1

Notes

Upon successful execution, a value of 0 will be returned by Atmel AT88SA10HS

The SHA-256 message body used to create the resulting digest internally stored in the chip consists of the following 512-bits:

256-bits

PersonalizeKey[KeyID]

64-bits

Fixed value of all ones

127-bits

Seed from input stream

1-bits

‘1’ pad

64-bits

length of message in bits, fixed at 447

Atmel AT88SA10HS [DATASHEET] 17

8595G−CRYPTO−9/11

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