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Merge pull request #199 from damz/patch-1

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PROTOCOL.md: Explain the source of the D2D salt
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Gregory K
2025-06-12 02:25:48 +03:00
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@@ -124,7 +124,7 @@ 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: 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 client key**, using the **next protocol secret** for input key material, `82AA55A0D397F88346CA1CEE8D3909B95F13FA7DEB1D4AB38376B8256DA85510` (`SHA256("D2D")`) for salt, and the string `client` for info
* **D2D server 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). 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).