Fix authentication so it works with Mi Band 6 - Githubissues

gzalo / miband-6-heart-rate-monitor

Heart rate monitor website for Mi Band 6

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Fix authentication so it works with Mi Band 6 #1

Closed gzalo closed 2 years ago

gzalo commented 3 years ago

New auth method is much complex and uses ECDH

privateEC = 24 random bytes
publicEC = ecdh_generate_public(privateEc) (48 bytes)
sendPubkeyCommand: 0x04 0x02 0x00 0x02 + publicEC
writeToChunked2021 (0x82 endpoint) with that command (not encrpyted)
Listen to things in characteristic Chunked2021Read

How to fix:

[x] Port kokke/tiny-ECDH-c to wasm (I couldn't find any other browser JS library that implements NIST B-163 / sect163r2 elliptic curve)
[x] Validate port with random data similar to testAuth in InitOperation2021.java from GadgetBridge... Couldn't use JNI in an unit test so I ended up using the "run debug function" button in the app.
[x] Copy logic for reading and writing

gzalo commented 2 years ago

It's now working 😁