jglim / UnlockECU

Free, open-source ECU seed-key unlocking tool.
MIT License
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Crypto keys in CBF files #13

Open VladLupashevskyi opened 2 years ago

VladLupashevskyi commented 2 years ago

I've read on some forum that CBF files contain some information that helps to generate seed keys and decided to do a binary search.

I've just took DaimlerStandardSecurityAlgo as an example, reversed byte order for the key from db.json and here what I've found:

CR6NFZ:

image

MED177:

image

Also that might be helpful for IC204 #10, found the similar structure in CBF file (compared to CR6NFZ), i assume it must be somewhere here:

image

Also I found that Vediamo uses c32s.dll, which contains all different algorithms and you just need to get keys from CBF.

I hope this was helpful.

jglim commented 2 years ago

Hello VladLupashevskyi,

Happy holidays and thanks for sharing!

Indeed, from my understanding, CBF files can contain scripting elements for various tasks. Here's an example from the 204:

204_cbf_capabilities

These scripting elements are executed through _MIInterpreter in c32s.dll and there is quite a large set of opcodes. Apart from basic cpu-like features, a lot of these opcodes are for higher-level interactions, such as retrieving data from the CBF files, reading the VCI's serial number etc.

Here's a snippet of what _MIInterpreter looks like. Please ignore the comments for now as they might be incorrect:

miinterpreter

While working on CaesarSuite, I added a very minimal loader and did not use it as it was very unreliable. It is there as a reference, and I hope someone takes on the challenge to implement a usable interpreter :)

The bad news is that high-level unlocking capabilities are most likely not stored in the CBF (as far as I am aware), in the same way that high-level unlocking capabilities are also not included in SMR-D files.

Below is an example dump of a script's state, IC_204_WVC_FlashApplication_0 , as it should appear prior to execution. Shared variables are prefixed with Var: and functions are prefixed with Fn:.

Var: Char/Array [1050] @ 110 : STAR12_V01___SWIL
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

Var: Char/Array [20] @ 1160 : STAR12_V01___SWIL_SIGNATURE_DATA___DEVELOPMENT_KEY
360EE4686D1CAE4AA8F73DED27CDD60EDDE6AD84

Var: Char/Array [20] @ 1180 : STAR12_V01___SWIL_SIGNATURE_DATA___PRODUCTION_KEY
360EE4686D1CAE4AA8F73DED27CDD60EDDE6AD84

Var: Char/Array [100] @ 1200 : LNegRespMsg
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Var: Char/Array [80] @ 1300 : str
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Var: Char/Array [80] @ 1380 : sGlobalErrorText
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Var: DWord/Primitive [1] @ 46 : cGlobalErrorCode
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Var: Char/Pointer [1] @ 82 : pLRequest
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Var: Char/Pointer [1] @ 86 : pLResponse
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Var: Char/Pointer [1] @ 90 : pLGlobalDSIO
00000000

Var: Char/Primitive [1] @ 1 : cLRequestType
00

Var: Char/Array [4096] @ 1460 : sLRequestMessage
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Var: Char/Array [4096] @ 5556 : acUserServiceRequestBuffer
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Var: Char/Primitive [1] @ 2 : cLPALError
00

Var: Word/Primitive [1] @ 20 : wLRequestLength
0000

Var: Word/Primitive [1] @ 22 : wLRequestContextStart
0000

Var: Word/Primitive [1] @ 24 : wLRequestContextLength
0000

Var: Word/Primitive [1] @ 26 : wUserServiceRequestLength
0000

Var: Char/Primitive [1] @ 3 : cLResponseControl
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Var: Char/Primitive [1] @ 4 : cLResponseSourceAddress
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Var: Char/Primitive [1] @ 5 : cLResponseStatus
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Var: Char/Primitive [1] @ 6 : cLResponseType
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Var: Char/Pointer [1] @ 94 : pLResponseMessage
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Var: Char/Pointer [1] @ 98 : pLSResponsePtr
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Var: Char/Array [500] @ 9652 : aLSECUAddr
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Var: Char/Array [500] @ 10152 : aLSECUFlag
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Var: Char/Array [500] @ 10652 : aLSECUnext
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Var: Word/Primitive [1] @ 28 : wLResponseContextLength
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Var: Word/Primitive [1] @ 30 : wLResponseContextStart
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Var: Word/Primitive [1] @ 32 : wLResponseLength
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Var: Word/Primitive [1] @ 34 : wLSNameNumber
0000

Var: Word/Primitive [1] @ 36 : wLSNext
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Var: Word/Array [500] @ 15476 : awLSEcuContextLen
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Var: Word/Array [500] @ 16476 : awLSECUContextSart
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Var: Word/Array [500] @ 17476 : awLSECUBLen
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Var: Word/Array [500] @ 18476 : awLSECUResponseLen
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Var: Word/Primitive [1] @ 38 : wLSMalloc
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Var: Word/Primitive [1] @ 40 : wLSResponseLen
0000

Var: DWord/Array [500] @ 19476 : adwLSResponsePtr
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Var: Char/Primitive [1] @ 7 : cAnError
00

Var: Char/Primitive [1] @ 8 : cLGECUAddress
00

Var: Char/Primitive [1] @ 9 : cLGECUFlags
00

Var: Char/Array [4096] @ 11152 : sDataToDownload
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Var: Word/Primitive [1] @ 42 : wBlockSizeToTransfer
0000

Var: Char/Primitive [1] @ 10 : cActiveLogicalBlock
00

Var: Char/Primitive [1] @ 11 : currentBsc
00

Var: DWord/Primitive [1] @ 50 : lCRCLength
00000000

Var: DWord/Primitive [1] @ 54 : lSignatureLength
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Var: Char/Array [4] @ 15248 : sCRCData
00000000

Var: Char/Array [128] @ 15252 : sSignatureData
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Var: Char/Primitive [1] @ 12 : withLengthInformation
00

Var: DWord/Primitive [1] @ 58 : lSwilCRCLength
00000000

Var: DWord/Primitive [1] @ 62 : lSwilCRCValue
00000000

Var: DWord/Primitive [1] @ 66 : lSwilSignatureLength
00000000

Var: DWord/Primitive [1] @ 70 : lSwilStartAddress
00000000

Var: DWord/Primitive [1] @ 74 : lSwilLength
00000000

Var: Char/Pointer [1] @ 102 : pubSwilData
00000000

Var: Char/Pointer [1] @ 106 : pubSwilSignatureData
00000000

Var: Char/Primitive [1] @ 13 : cSecurityClass
00

Var: Char/Array [10] @ 15380 : Seed
00000000000000000000

Var: Char/Array [6] @ 15390 : Key
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Var: Char/Primitive [1] @ 14 : Seed_Length
00

Var: Char/Primitive [1] @ 15 : Key_Length
00

Var: DWord/Primitive [1] @ 78 : Key_Konstante
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Var: Char/Primitive [1] @ 16 : SignatureKeyType
00

Var: Char/Primitive [1] @ 17 : NegResponse
00

Var: Char/Primitive [1] @ 18 : NegResponseCode
00

Var: Word/Primitive [1] @ 44 : NegResponseErrorCode
0000

Var: Char/Array [80] @ 15396 : NegResponseErrorText
0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Fn: LGenerateServiceMessage Ordinal: 1 EP: 0x591E000E, InParam: 18 @ 0x5427, OutParam: 1 @ 0x22820
Fn: InitFlashjob Ordinal: 1 EP: 0x47A4, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: ProgrammingMode Ordinal: 2 EP: 0xA92, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: StandardSecModSecurityAccess Ordinal: 3 EP: 0x14C2, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: WriteFingerprint Ordinal: 4 EP: 0x19EC, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: SWIL_Schreiben Ordinal: 5 EP: 0x312E, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: CheckRoutine_SWIL Ordinal: 6 EP: 0x1B6E, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: EraseRoutine Ordinal: 7 EP: 0x2008, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: CheckRoutine_Flash Ordinal: 8 EP: 0x2462, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: EcuReset Ordinal: 9 EP: 0x2FA4, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: ExtendedSession Ordinal: 10 EP: 0xE6E, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: ReadActiveDiagnosticInformation Ordinal: 11 EP: 0x1242, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: SetEcuVariantParameters Ordinal: 12 EP: 0xC6, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: SendRequest Ordinal: 13 EP: 0x46F4, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: LGenerateServiceMessage Ordinal: 14 EP: 0x3136, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: LLReceiveCollectResponse Ordinal: 15 EP: 0xC4, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: LReceiveResponse Ordinal: 16 EP: 0x3E44, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: LRefuseMessageHandling Ordinal: 17 EP: 0x3F70, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: LFreeCollectResponse Ordinal: 18 EP: 0x4676, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: LCreateCollectResponse Ordinal: 19 EP: 0x46E2, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: FlashDownload Ordinal: 20 EP: 0x7CA, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: FlashProg Ordinal: 21 EP: 0x73C, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: FlashData Ordinal: 22 EP: 0x748, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: FlashApplication Ordinal: 23 EP: 0x754, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: FlashRessource1 Ordinal: 24 EP: 0x760, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: FlashRessource2 Ordinal: 25 EP: 0x76C, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: FlashBase Ordinal: 26 EP: 0x778, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: FlashExtension Ordinal: 27 EP: 0x784, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: SecurityAccess Ordinal: 28 EP: 0x790, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: SWIL_Download Ordinal: 29 EP: 0x7B6, InParam: 0 @ 0x0, OutParam: 0 @ 0x0
Fn: LReceiveCollectResponse Ordinal: 30 EP: 0x38BC, InParam: 0 @ 0x0, OutParam: 0 @ 0x0