Configurator level password encryption by AES-GCM-128

By JavierDiaz , 26 August, 2024
Forums
Gurux.DLMS

Hi,
Please tell me, is there a ready tool for password encryption using aes gcm 128?
I need to encrypt the new password with the current password and pass it to the association method 2.
Thanks!

Kurumi

1 year 11 months ago

Hi,

The DLMS standard is very open for the high-level password update. Different manufacturers are using different ways to update it.
You can try with AES RFC3394 key-wrapping.
You can try to update the password with GXDLMSSecureClient.Encrypt method.

Send generated bytes to meter using GXDLMSAssociationLogicalName.UpdateSecret method.

BR,
Mikko

JavierDiaz

1 year 11 months ago

Thanks for the answer!
This method returns the encrypted password as a 24 byte array, our device expects 16 bytes, how can this be done?

Kurumi

1 year 11 months ago

Hi,

It seems that the password is only encrypted and AES RFC3394 key-wrapping is not used. What programming language are you using?

BR,
Mikko