Update brook-server-protocol.md

docs/brook-server-protocol.md

@@ -23,6 +23,10 @@
         - `Password`: User-defined password
         - `Nonce`: 12 bytes
         - `Info`: [0x62, 0x72, 0x6f, 0x6f, 0x6b]
+- **`HKDF`**: Defined in RFC 5869
+- **`SHA256`**: Defined in FIPS 180-4
+- **`AES`**: Defined in U.S. Federal Information Processing Standards Publication 197
+- **`AES-GCM`**: Defined in RFC 5246, 5869
 
 ## Client --TCP--> Server
 
@@ -33,9 +37,7 @@ Client Nonce + [AES_GCM(Fragment Length) + AES_GCM(Fragment)]...
 > The maximum length of `AES_GCM(Fragment Length) + AES_GCM(Fragment)` is 2048 bytes
 
 - `Client Nonce`: 12 bytes, randomly generated
-
-> The nonce should be recalculated when it is not used for the first time, the calculation method: add `1` to the first 8 bytes according to the Little Endian 64-bit unsigned integer
-
+    - The nonce should be recalculated when it is not used for the first time, the calculation method: add `1` to the first 8 bytes according to the Little Endian 64-bit unsigned integer
 - `Fragment Length`: Big Endian 16-bit unsigned integer
 - `Fragment`: Actual data being proxied
     - The first Fragment should be:
@@ -53,9 +55,7 @@ Server Nonce + [AES_GCM(Fragment Length) + AES_GCM(Fragment)]...
 > The maximum length of `AES_GCM(Fragment Length) + AES_GCM(Fragment)` is 2048 bytes
 
 - Server Nonce: 12 bytes, randomly generated
-
-> The nonce should be recalculated when it is not used for the first time, the calculation method: add `1` to the first 8 bytes according to the Little Endian 64-bit unsigned integer
-
+    - The nonce should be recalculated when it is not used for the first time, the calculation method: add `1` to the first 8 bytes according to the Little Endian 64-bit unsigned integer
 - `Fragment Length`: Big Endian 16-bit unsigned integer
 - `Fragment`: Actual data being proxied