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AT88SA10HS-TSU-T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
Atmel AT88SA10HS [DATASHEET] 13
8595H−CRYPTO−9/2012
6.1 HOST0
Concatenates the key stored in AT88SA10HS with an input 256-bit challenge and generates the digest of this message. The
result is left in internal memory and cannot be read. In general, the challenge should be a random number generated by the
host system, which will be sent to both the host (AT88SA10HS) and client (AT88SA100S or AT88SA102S).
Table 6-1. Input Parameters
Name Size Notes
Opcode
HOST0 1 0x08
Param1
Overwrite 1 If non-zero, overwrite part of internally generated key with secret fuses.
Param2
KeyID 2 The internal key to be used to generate the digest.
Data
Challenge 32 Challenge to be sent to the client AT88SA100S or AT88SA102S.
Table 6-2. Output Parameters
Name
Size
Notes
Success 1 Upon successful completion of HOST0, a value of zero will be returned by AT88SA10HS.
The 512-bit message block that will be hashed with the SHA-256 algorithm will consist of:
256-bits key[KeyID]
256-bits challenge
If the overwrite parameter is 0, then the 512-bit message block that will be hashed using the SHA-256 algorithm will consist of:
256-bits key[KeyID]
256-bits challenge
If the overwrite parameter has a value of 0x01, then the 512-bit message block that will be hashed using the SHA-256
algorithm will consist of:
192-bits key[KeyID]
64-bits Fuse[0-63]
256-bits challenge
All other values of the overwrite parameter are not recommended for use.
Atmel AT88SA10HS [DATASHEET] 14
8595H−CRYPTO−9/2012
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
Name Size Notes
Opcode
HOST1 1 0x40
Param1
Mode 1 Controls composition of message, see below for details.
Param2
Zero 2 Must be 0x0000.
Data
OtherInfo 13 Input portion of message to be digested.
Table 6-4. Output Parameters
Name Size Notes
Success 1 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
Source
Notes
32-bits OtherInfo[0-31] Opcode, param1 and param2 values sent to 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 ATSA100S/AT88SA102S, or zeros.
8-bits Fuse[88-95] Fuse MfrID, should match between AT88SA10HS and AT88SA100S/AT88SA102S.
32-bits OtherInfo[56-87] Fuse SN from AT88SA100S/AT88SA102S (Fuse[96-127]), or zeros.
16-bits ROM MfrID Should match between AT88SA10HS and AT88SA100S/AT88SA102S.
16-bits OtherInfo[88-103] 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] 15
8595H−CRYPTO−9/2012
6.3 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, and HOST2
commands must be re-executed – HOST2 cannot be repeatedly executed.
Table 6-6. Input Parameters
Name Size Notes
Opcode
HOST2 1 0x80
Param1
Zero1 1 Must be 0x00.
Param2
Zero2 2 Must be 0x0000.
Data
ClientResponse 32 Response from the client.
Table 6-7. Output Parameters
Name Size Notes
Success 1 If the input ClientResponse matches the internally generated response, a value of zero will be
returned by AT88SA10HS after a T
HOST
delay. If the two digests do not match, a value of 0x0F
will be returned after a T
HOST
delay
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

AT88SA10HS-TSU-T

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Buy AT88SA10HS-TSU-T
Manufacturer:
Microchip Technology / Atmel
Description:
Security ICs / Authentication ICs Host Auth. IC CryptoAuth SHA-256
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