SAM AV2 ChangeKeyEntry error 0x6982

[Hugo]

I’ trying load new AES-128 keys into a SAM AV2 (not converted to AV2 mode) and I get some problems with the ChangeKeyEntry command.
The AuthenticationHost command is executed successfully using a AES-128 key and a session key is generated. The Authentication is done using the KeyChangeNo required to change the requested key.

The problem occurs in the ChangeKeyEntry command that always returns 0x6982. I think that the problem is the CRC32… I’m not sure which data must be used to calculate the CRC32.

Can you indicate which data must be used to calculate the CRC32?
Where I can found a sample of the CRC32 algorithm used by SAM AV2 (SAM not converted to AV2 mode)?

Below you can find a sample of my CRC32:
KeyNo: 0x01
ProMask: 0xff
KeyEntryData: 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000FF2001000102
CRC32: 0x37c54191

Thanks,
Hugo

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[TapLinx Support]

Hi Hugo,

Your CRC32 calculation is correct! I get the same result.

Please note: you must successfully authenticate to the key entry before you can change the key! This is a protection mechanism to prevent unintended changing of keys. Take in mind: you cannot readout key values.

The TapLinx team

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[Hugo]

I do an authentication with the key required to change this keyentry. I believe that the authentication is performed correctly.
Below you can find the steps executed. Can you verify if the steps are correct?

Thanks in advance.

AutheticationHost AES-128
Key : 6E40CAFEC6AB18BCB41FFA3F379ACDF6
KeyNo : 0x00
KeyVer : 0x00

CAPDU (8): 80A4000002000000
RAPDU (18): 8573385F5644106B3985FF45EA110B9590AF

Random B ENC (16): 8573385F5644106B3985FF45EA110B95
Random B (16): 272C63E00A540A04F46F60B36AC2EA8A
Random B' (16): 2C63E00A540A04F46F60B36AC2EA8A27
Random A (16): C94F85B6F8ABA21424A044A8FA36347F
Random AB' (32): C94F85B6F8ABA21424A044A8FA36347F2C63E00A540A04F46F60B36AC2EA8A27
Random AB' ENC (32): E9D492D45A4751DB452EE7536DCD0A466DCC004FB8EADAA86F0AB7FFF75144DC

CAPDU (38): 80A4000020E9D492D45A4751DB452EE7536DCD0A466DCC004FB8EADAA86F0AB7FFF75144DC00
RAPDU (18): AB6F8E07EC73588845C5133420B959BD9000

Random A' ENC (16): AB6F8E07EC73588845C5133420B959BD
Random A' (16): 4F85B6F8ABA21424A044A8FA36347FC9
Random A' INT (16): 4F85B6F8ABA21424A044A8FA36347FC9 (calculated internally based on Random A)
Session Key AES (16): C94F85B6272C63E0FA36347F6AC2EA8A
Session IV (16): 00000000000000000000000000000000
AuthenticateHostAES_AV1 OK

ChangeKeyEntry
KeyNo : 0x01
ProMask : 0xFF
Current CEKeyNo : 0x00
Current CEKeyV : 0x00

DataToCRC32 (60): 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000FF2001000102
CRC32 value (4) : 37C54191
DataToEncrypt (64): 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000FF200100010237C54191
CipheredData (64): 2CE7A49BDEACCCB2D54E3BC9A1529BA019BB2376BE663757D651758E9BF85CDAABB9D6B7EB83D01C68DDD3C8A8602DF47EA022B6CF1B5E9708C6C4841A15F0B7

CAPDU (69): 80C101FF402CE7A49BDEACCCB2D54E3BC9A1529BA019BB2376BE663757D651758E9BF85CDAABB9D6B7EB83D01C68DDD3C8A8602DF47EA022B6CF1B5E9708C6C4841A15F0B7
RAPDU (2): 6982

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