Doggy OS File system encryption API

-- cryptoAPI.lua

local cryptoAPI = {}

local key = 123 -- Define a key for XOR encryption/decryption

-- Function to encrypt/decrypt a string using XOR
local function xorEncryptDecrypt(data, key)
    local result = ""
    for i = 1, #data do
        result = result .. string.char(bit.bxor(data:byte(i), key))
    end
    return result
end

-- Encrypt function
function cryptoAPI.Encrypt(directory)
    local function encryptDirectory(directory)
        local files = fs.list(directory)
        for _, file in ipairs(files) do
            local path = fs.combine(directory, file)
            if fs.isDir(path) then
                -- Recursively encrypt directories
                encryptDirectory(path)
            else
                local fileHandle = fs.open(path, "r")
                local content = fileHandle.readAll()
                fileHandle.close()
                local encryptedContent = xorEncryptDecrypt(content, key)
                fileHandle = fs.open(path, "w")
                fileHandle.write(encryptedContent)
                fileHandle.close()
                print("Encrypted: " .. path)
            end
        end
    end

    -- Start encryption
    encryptDirectory(directory)
    print("Encryption completed.")
end

-- Decrypt function
function cryptoAPI.Decrypt(directory)
    local function decryptDirectory(directory)
        local files = fs.list(directory)
        for _, file in ipairs(files) do
            local path = fs.combine(directory, file)
            if fs.isDir(path) then
                -- Recursively decrypt directories
                decryptDirectory(path)
            else
                local fileHandle = fs.open(path, "r")
                local content = fileHandle.readAll()
                fileHandle.close()
                local decryptedContent = xorEncryptDecrypt(content, key)
                fileHandle = fs.open(path, "w")
                fileHandle.write(decryptedContent)
                fileHandle.close()
                print("Decrypted: " .. path)
            end
        end
    end

    -- Start decryption
    decryptDirectory(directory)
    print("Decryption completed.")
end

return cryptoAPI