AT88SA10HS-TH-T 데이터 시트보기 (PDF) - Atmel Corporation

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AT88SA10HS-TH-T

Atmel CryptoAuthentication Host Security Chip

Atmel Corporation 

6.2 HOST1

Completes the two block SHA-256 digest started by HOST0 and leaves the resulting digest within the internal memory of the

AT88SA10HS. This command returns an error if HOST0 has not been successfully run previously within this Wake cycle.

As a security precaution, this command does not return the digest. A subsequent command is required to compare the

response generated by the client with the one generated by the host.

Table 6-3. Input Parameters

Opcode

Param1

Param2

Data

Name

HOST1

Mode

Zero

OtherInfo

Size

1

1

2

13

Notes

0x40

Controls composition of message, see below for details

Must be 0x0000

Input portion of message to be digested

Table 6-4. Output Parameters

Name

Success

Size

1

Notes

Upon successful completion of HOST1, a value of zero will be returned by AT88SA10HS

The contents of the second block to be digested are listed below.

Note:

To simplify this documentation; the bit addresses for OtherInfo are listed in the table below

Size

32-bits

64-bits

24-bits

8-bits

32-bits

16-bits

16-bits

Source

OtherInfo[0-31]

Fuse[0-63]

OtherInfo[32-55]

Fuse[88-95]

OtherInfo[56-87]

ROM MfrID

OtherInfo[88-103]

Notes

Opcode, param1 and param2 values sent to AT88SA100S/AT88SA102S

If enabled by bit five of the input mode parameter and if Fuse[87] is burned, else forced to

zero

Status fuse values from ATSA100S/AT88SA102S, or zeros

Fuse MfrID, should match between AT88SA10HS and AT88SA100S/AT88SA102S

Fuse SN from AT88SA100S/AT88SA102S (Fuse[96-127]), or zeros

Should match between AT88SA10HS and AT88SA100S/AT88SA102S

ROM SN from AT88SA100S/AT88SA102S, or zeros

These bits are followed by the necessary ‘1’ bit, ‘0’ padding and 64-bit length as specified in the SHA-256 specification.

6.2.1.1 Mode Encoding

Bit five of the mode is used to indicate whether or not the secret fuse bits are to be included in the calculation. The remaining

bits of the mode field are ignored by AT88SA10HS and should be zero.

Table 6-5. Mode Encoding

Bit[5]

Fuse Block

0

No fuse values inserted

1

Insert the values of Fuse[0-63] in the message

If Fuse[87] has not been burned, then the values of Fuse[0-63] will be replaced by zeros in the above message generation

step as a security measure.

Atmel AT88SA10HS [DATASHEET] 14

8595G−CRYPTO−9/11

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