DLMS_ERROR_CODE_INVALID_DECIPHERING_ERROR

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By MetersGuru , 26 January, 2023
Forums
Gurux.DLMS

Hello,

We are trying to establish a secured connection with security suite 1 and we filled the "Secured Connections" window with the following parameters:
Security : authenticationEncryption
System Title: 41 42 43 44 45 46 47 48
Block cipher key: 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
Authentication key: D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF

The connection is not working for us, I have a DLMS_ERROR_CODE_INVALID_DECIPHERING_ERROR for the "cip_decrypt" function inside the "apdu_parseUserInformation" function.

following the GXDLMSDirector log:

GXDLMSDirector 9.0.2210.0401
Log created 16:30:45
16:30:47 Initializing serial connection.
16:30:48 Send SNRM request.
7E A0 21 44 D1 03 93 6A 21 81 80 14 05 02 04 00 06 02 04 00 07 04 00 00 00 01 08 04 00 00 00 01 72 E3 7E

16:30:48
7E A0 1F 03 44 D1 73 D4 EE 81 80 12 05 01 80 06 01 80 07 04 00 00 00 01 08 04 00 00 00 01 53 3B 7E

16:30:48 Parsing UA reply succeeded.
16:30:48 Send AARQ request.
7E A0 6C 44 D1 03 10 AF 2A E6 E6 00 60 5D A1 09 06 07 60 85 74 05 08 01 03 A6 0A 04 08 41 42 43 44 45 46 47 48 8A 02 07 80 8B 07 60 85 74 05 08 02 05 AC 12 80 10 74 5A 42 17 61 07 60 1E 52 27 02 01 18 22 78 12 BE 23 04 21 21 1F 31 00 00 00 00 1F 58 4B 30 32 AF 28 57 07 12 C6 0D 7E 8F 63 B7 D6 63 02 F7 BE 75 89 C1 44 6B D2 18 7E

16:30:48
7E A0 10 03 44 D1 30 B7 F4 E6 E7 00 D8 02 05 70 2F 7E

16:30:48 Disconnect request
16:30:48
7E A0 1F 03 44 D1 73 D4 EE 81 80 12 05 01 80 06 01 80 07 04 00 00 00 01 08 04 00 00 00 01 53 3B 7E

Gurux.DLMS.GXDLMSExceptionResponse: Exception response. "Service unknown"-exception. Deciphering failed
in Gurux.DLMS.GXDLMS.HandleExceptionResponse(GXReplyData data)
in Gurux.DLMS.GXDLMS.GetPdu(GXDLMSSettings settings, GXReplyData data)
in Gurux.DLMS.GXDLMS.GetData(GXDLMSSettings settings, GXByteBuffer reply, GXReplyData data, GXReplyData notify)
in Gurux.DLMS.GXDLMSClient.GetData(GXByteBuffer reply, GXReplyData data, GXReplyData notify)
in GXDLMSDirector.GXDLMSCommunicator.ReadDLMSPacket(Byte[] data, Int32 tryCount, GXReplyData reply)
in GXDLMSDirector.GXDLMSCommunicator.ReadDataBlock(Byte[] data, String text, Int32 multiplier, Int32 tryCount, GXReplyData reply)
in GXDLMSDirector.GXDLMSCommunicator.ReadDataBlock(Byte[] data, String text, Int32 multiplier, GXReplyData reply)
in GXDLMSDirector.GXDLMSCommunicator.ReadDataBlock(Byte[] data, String text, GXReplyData reply)
in GXDLMSDirector.GXDLMSCommunicator.ReadDataBlock(Byte[][] data, String text, GXReplyData reply)
in GXDLMSDirector.GXDLMSCommunicator.InitializeConnection(Boolean force)
in GXDLMSDirector.GXDLMSDevice.InitializeConnection()
in GXDLMSDirector.MainForm.Connect(Object sender, GXAsyncWork work, Object[] parameters)

Best Regards,

Gianluca

Kurumi

3 years 4 months ago

Hi Gianluca,

Your meter returns Deciphering failed error. It means that your ciphering settings (block cipher or/and authentication keys) are different in the client and the meter.

Check those values.

BR,
Mikko

MetersGuru

3 years 4 months ago

Hi Mikko,
thank you for your answer but I unfortunately have the same issue also executing the "GuruxDLMSSimpleServerExample" that, as much as I see, uses the default cipher & auth keys. I've found that "cip_crypt" inside "apdu_parseUserInformation" fails returning "DLMS_ERROR_CODE_INVALID_TAG" due to "memcmp(NONSE, input->data + input->size, 12)".

Following I have reported the server log and attached a screenshot with my GXDLMSDirector settings.

RX: 7E A0 21 02 03 21 93 73 56 81 80 14 05 02 04 00 06 02 04 00 07 04 00 00 00 01 08 04 00 00 00 01 72 E3 7E
svr_isTarget.

Connecting without authentication.

svr_connected to HDLC level.

TX 7E A0 1F 21 02 03 73 D5 E4 81 80 12 05 01 80 06 01 80 07 04 00 00 00 01 08 04 00 00 00 01 53 3B 7E

RX: 7E A0 2C 02 03 21 10 94 9C E6 E6 00 60 1D A1 09 06 07 60 85 74 05 08 01 01 BE 10 04 0E 01 00 00 00 06 5F 1F 04 00 62 1E 5D FF FF 88 55 7E
svr_validateAuthentication

findObject 15 0.0.40.0.0.255

svr_connected DLMS level.

TX 7E A0 38 21 02 03 30 07 C4 E6 E7 00 61 29 A1 09 06 07 60 85 74 05 08 01 01 A2 03 02 01 00 A3 05 A1 03 02 01 00 BE 10 04 0E 08 00 06 5F 1F 04 00 00 00 10 02 00 00 07 1C EA 7E

RX: 7E A0 1A 02 03 21 32 CD 71 E6 E6 00 C0 01 C1 00 01 00 00 2B 01 00 FF 02 00 7D 8F 7E
svr_getAttributeAccess

svr_preRead: 1 0.0.43.1.0.255

svr_postRead: 1 0.0.43.1.0.255

TX 7E A0 16 21 02 03 52 3A 85 E6 E7 00 C4 01 C1 00 06 00 00 00 01 F4 09 7E

RX: 7E A0 08 02 03 21 53 8A A1 7E
svr_disconnected

TX 7E A0 1F 21 02 03 73 D5 E4 81 80 12 05 01 80 06 01 80 07 04 00 00 00 01 08 04 00 00 00 01 53 3B 7E

RX: 7E A0 21 02 03 03 93 F0 46 81 80 14 05 02 04 00 06 02 04 00 07 04 00 00 00 01 08 04 00 00 00 01 72 E3 7E
svr_isTarget.

Connecting using High authentication.

svr_connected to HDLC level.

TX 7E A0 1F 03 02 03 73 F0 52 81 80 12 05 01 80 06 01 80 07 04 00 00 00 01 08 04 00 00 00 01 53 3B 7E

RX: 7E A0 6C 02 03 03 10 35 4D E6 E6 00 60 5D A1 09 06 07 60 85 74 05 08 01 03 A6 0A 04 08 41 42 43 44 45 46 47 48 8A 02 07 80 8B 07 60 85 74 05 08 02 05 AC 12 80 10 00 49 3A 03 79 09 3D 65 6D 64 39 24 33 4E 6D 69 BE 23 04 21 21 1F 31 00 00 00 02 23 7F E0 A9 FA 32 2D DC 9B 2F A1 E3 F6 09 C8 9C 1E 18 3A 16 BB DA 6D 0A 39 6D FE E9 7E
TX 7E A0 10 03 02 03 30 93 48 E6 E7 00 D8 02 05 70 2F 7E

RX: 7E A0 08 02 03 03 53 09 B1 7E
svr_disconnected

TX 7E A0 1F 03 02 03 73 F0 52 81 80 12 05 01 80 06 01 80 07 04 00 00 00 01 08 04 00 00 00 01 53 3B 7E

svr_preAction: 40 0.0.25.9.0.255

sendPush 40 0.0.25.9.0.255
Thu Feb 2 17:23:00 2023
30 seconds before next invoke Thu Feb 2 17:23:30 2023

svr_preAction: 40 0.0.25.9.0.255

sendPush 40 0.0.25.9.0.255
Thu Feb 2 17:23:30 2023
30 seconds before next invoke Thu Feb 2 17:24:00 2023

svr_preAction: 40 0.0.25.9.0.255

sendPush 40 0.0.25.9.0.255
Thu Feb 2 17:24:00 2023
30 seconds before next invoke Thu Feb 2 17:24:30 2023

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