Gurux.DLMS python decryption

Forum Rules

Before commenting read Forum rules

Don't comment the topic if you have a new question.

You can create a new topic selecting correct category from Gurux Forum and then create a new topic selecting "New Topic" from the top left.

By ravichandra99 , 14 June, 2022
Forums
Gurux.DLMS

Hi Mikko

Im using gurux python, Im able to get data and its encrypted and in xml format
im unable to decrypt

rawdata is in

https://pastebin.com/W2XtWtR4

and the code im using is

from gurux_dlms import GXDLMSTranslator
from gurux_dlms import GXByteBuffer
data = "data here"
t = GXDLMSTranslator()
t.comments = True
t.systemTitle = "TRI00000".encode()
t.blockCipherKey = bytearray((0x54, 0x72, 0x69, 0x5F, 0x5F, 0x5F, 0x55, 0x6E, 0x69, 0x63, 0x61, 0x73, 0x74, 0x41, 0x73, 0x63))
t.authenticationKey = bytearray((0x54, 0x72, 0x69, 0x5F, 0x5F, 0x5F, 0x55, 0x6E, 0x69, 0x63, 0x61, 0x73, 0x74, 0x41, 0x73, 0x63))
t.serverSystemTitle = GXByteBuffer.hexToBytes("4142434445464748")
print(t.messageToXml(data))

Kurumi

3 years 12 months ago

Hi,

Can you give the raw data in hex so I can check this from the bytes?

BR,
Mikko

ravichandra99

3 years 12 months ago

Hi

Cipher key and Authentication key are same

pls try from gurux_dlms import GXDLMSTranslator
from gurux_dlms import GXByteBuffer
data = "00 01 00 01 00 10 00 58 DB 08 41 42 43 44 45 46 47 48 4D 30 00 00 00 00 11 98 4B 30 35 F0 35 51 06 72 DA 54 93 70 8E 70 9B 3D BD 31 02 14 CE 10 A9 89 81 92 53 80 42 A9 19 D7 52 62 7B E6 70 B3 13 30 E1 53 B6 9D 0B 6D 14 8D 86 F9 D4 6F 6B C3 09 24 A8 4C 50 03 82 FF 05 77 A5 9B F1 1F CD 78"
t = GXDLMSTranslator()
t.comments = True
t.systemTitle = "TRI00000".encode()
t.blockCipherKey = bytearray(0x52, 0x45, 0x53, 0x5F, 0x55, 0x6E, 0x69, 0x63, 0x61, 0x73, 0x74, 0x41, 0x73, 0x73, 0x63, 0x30))
t.authenticationKey = bytearray((0x52, 0x45, 0x53, 0x5F, 0x55, 0x6E, 0x69, 0x63, 0x61, 0x73, 0x74, 0x41, 0x73, 0x73, 0x63, 0x30))
t.serverSystemTitle = GXByteBuffer.hexToBytes("4142434445464748")
print(t.messageToXml(data))

or 52 45 53 5F 55 6E 69 63 61 73 74 41 73 73 63 30 as cipher key and auth key

Kurumi

3 years 12 months ago

Hi,

Get the latest version (1.0.126). There was an issue with GXDLMSTranslator and ciphering.

BR,
Mikko

ravichandra99

3 years 12 months ago

Hi Mikko Ihad tried with the lastest version , still im not getting decrypted data
its working with Director GUI, but not working using python,

One more thing is earlier python client command used to work , but now its also not working
im using ipv6 to connect to meter ..

ravichandra99

3 years 12 months ago

from gurux_dlms import GXDLMSTranslator
from gurux_dlms import GXByteBuffer
data = "00 01 00 01 00 10 00 58 DB 08 41 42 43 44 45 46 47 48 4D 30 00 00 00 00 11 98 4B 30 35 F0 35 51 06 72 DA 54 93 70 8E 70 9B 3D BD 31 02 14 CE 10 A9 89 81 92 53 80 42 A9 19 D7 52 62 7B E6 70 B3 13 30 E1 53 B6 9D 0B 6D 14 8D 86 F9 D4 6F 6B C3 09 24 A8 4C 50 03 82 FF 05 77 A5 9B F1 1F CD 78"
t = GXDLMSTranslator()
t.comments = True
t.systemTitle = "TRI00000".encode()
t.blockCipherKey = bytearray((0x52, 0x45, 0x53, 0x5F, 0x55, 0x6E, 0x69, 0x63, 0x61, 0x73, 0x74, 0x41, 0x73, 0x73, 0x63, 0x30))
t.authenticationKey = bytearray((0x52, 0x45, 0x53, 0x5F, 0x55, 0x6E, 0x69, 0x63, 0x61, 0x73, 0x74, 0x41, 0x73, 0x73, 0x63, 0x30))
t.serverSystemTitle = GXByteBuffer.hexToBytes("4142434445464748")
print(t.messageToXml(data))

The above is code i had used

xml: https://pastebin.com/W2XtWtR4
encrypted: https://pastebin.com/feNYWbnm

Im stuck from last 2 weeks

Kurumi

3 years 12 months ago

Hi,

Your block and authentication keys are wrong. Use 54 72 69 5F 5F 5F 55 6E 69 63 61 73 74 41 73 63

BR,
Mikko