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ATSHA204A 데이터시트(PDF) 48 Page - Microchip Technology

부품명 ATSHA204A
상세설명  ATSHA204A Microchip CryptoAuthentication Data Sheet
PDF  93 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATSHA204A 데이터시트(HTML) 48 Page - Microchip Technology

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Name
Size Notes
0: Slot<SlotID>
1: TempKey
Bit 0:
Source of the second 32-bytes of the SHA message.
0: ClientChal parameter
1: TempKey
Param2 SlotID
2
Which internal slot is to be used to generate the response. Only bits 3-0 are used.
Data1
ClientChal
32
Challenge sent to Client. (Must appear in the input stream).
Data2
ClientResp
32
Response generated by the Client.
Data3
OtherData
13
Remaining constant data needed for response calculation.
Table 8-9. Output parameter
Name Size Notes
Result
1
Returns a 1-byte value of zero if ClientResp matches the internally computed digest, one if there is a
mismatch.
The message that is hashed with the SHA-256 algorithm consists of the following information:
32 bytes
key<SlotID> or TempKey (depending on the mode)
32 bytes
ClientChal or TempKey (depending on the mode)
4 bytes
OtherData<0:3>
8 bytes
OTP<0:7> or zeros (depending on the mode)
3 bytes
OtherData<4:6>
1 byte
SN<8>
4 bytes
OtherData<7:10>
2 bytes
SN<0:1>
2 bytes
OtherData<11:12>
The purpose of OtherData is to construct a SHA-256 message that matches identically to the MAC
message that was used to produce ClientResp. By comparing the message used for the SHA-256 of the
MAC command, OtherData is parsed as follows:
Table 8-10. OtherData
Size CheckMac
MAC
Notes
1
OtherData<0>
OpCode
MAC OpCode = 0x08
1
OtherData<1>
Mode
Mode used for MAC command.
2
OtherData<2:3>
SlotID
SlotID used for MAC command.
3
OtherData<4:6>
OTP<8:10>
OTP<8:10> used for MAC command. (Useful for Legacy.)
4
OtherData<7:10>
SN<4:7>
SN<4:7> used for MAC command. (Unique per Client.)
2
OtherData<11:12>
SN<2:3>
SN<2:3> used for MAC command. (Unique per Client.)
ATSHA204A
Security Commands
© 2018 Microchip Technology Inc.
DS40002025A-page 48



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