AT88SA10HS-TSU-T(2010) データシートの表示（PDF） - Atmel Corporation

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AT88SA10HS-TSU-T
(Rev.:2010)

Atmel CryptoAuthentication Host Security Chip

Atmel Corporation 

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

Source

Notes

32-bits OtherInfo[0-31]

Opcode, param1 & param 2 values sent to Atmel AT88SA100S/AT88SA102S

64-bits Fuse[0-63]

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

zero

24-bits OtherInfo[32-55] Status fuse values from Atmel ATSA100S/AT88SA102S, or zeros

8-bits Fuse[88-95]

Fuse MfrID, should match between Atmel AT88SA10HS and Atmel

AT88SA100S/AT88SA102S

32-bits OtherInfo[56-87] Fuse SN from Atmel AT88SA100S/AT88SA102S (Fuse[96-127]), or zeros

1 6-bits ROM MfrID

Should match between Atmel AT88SA10HS and Atmel AT88SA100S/AT88SA102S

16-bits OtherInfo[88-103] ROM SN from Atmel 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.

5.2.1.1. 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 Atmel® AT88SA10HS and should be zero.

Table 5-5. 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.

5.3.

HOST2

Compares the value previously generated by the AT88SA10HS using HOST0 and HOST1 with that on the input

stream coming from the client and returns status to indicate whether or not the two matched. This command

returns an error if HOST1 has not been previously successfully run within this Wake cycle.

If the two digests do not match, the AT88SA10HS provides no information as to the source of the mismatch,

which must be deduced from the inputs to the three HOSTX commands. On a match failure, the entire set of

HOST0, HOST1 & HOST2 commands must be re-executed – HOST2 cannot be repeatedly executed.

14 Atmel AT88SA10HS Host Authentication Chip

8595F–SMEM–8/10

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