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Grishka
2023-04-13 22:26:55 +03:00
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PROTOCOL.md
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@@ -119,7 +119,7 @@ The **next protocol secret** is further processed to obtain the two 32-byte AES
Derive two 32-byte "device to device" keys using HKDF-SHA256:
* **D2D client key**, using the **next protocol secret** for input key material, `82AA55A0D397F88346CA1CEE8D3909B95F13FA7DEB1D4AB38376B8256DA85510` for salt, and the string `client` for info
* **D2D cerver key**, using the same parameters, except **info** is `server`
* **D2D server key**, using the same parameters, except **info** is `server`
Next, derive the four keys you will use for the actual encryption. All four use the same value of salt, which is `SHA256("SecureMessage")`, or `BF9D2A53C63616D75DB0A7165B91C1EF73E537F2427405FA23610A4BE657642E`. These keys are from the server POV; if you're the client, they need to be swapped around (decrypt/receive shoud use the server key and vice versa).