This is a pure C# implementation of the proprietary key encryption done by CdelEdu.
The WebAssembly firstly modifies the raw key a bit, base64 decodes it and then decrypts it using the custom cipher.
The resulting key/iv pair can be used to decrypt the video file using AES-CBC.
CdelEdu Key Decrypter by github.com/DevLARLEY
Usage: CdelEduDecrypt.exe [key]
dotnet publish