WebRtc encryption in Flutter

[wilmakelcey]

Hello friends
Please answer, it is very important to me

1- Is it possible to have arbitrary encryption in Webrtc in the web or mobile version?
If possible, how is it?

2- If you cannot have a desired encryption, how can you change the encryption key?
For example, the page: https://webrtc.github.io/samples/src/content/insertable-streams/endtoend-encryption/
This is possible
How can I change the encryption key as desired?

These 2 questions are very important to me and I have been having problems in my program for a long time, please guide me

Thank you very much