Created
April 22, 2023 13:34
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websocket async encription
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| package main | |
| import ( | |
| "crypto/aes" | |
| "crypto/cipher" | |
| "encoding/base64" | |
| "log" | |
| "net/http" | |
| "sync" | |
| "github.com/gorilla/websocket" | |
| ) | |
| var upgrader = websocket.Upgrader{ | |
| ReadBufferSize: 1024, | |
| WriteBufferSize: 1024, | |
| } | |
| type UserKey struct { | |
| sync.RWMutex | |
| Key []byte | |
| } | |
| func main() { | |
| userKeys := make(map[string]*UserKey) | |
| http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { | |
| // Upgrade the HTTP connection to a WebSocket connection | |
| conn, err := upgrader.Upgrade(w, r, nil) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| defer conn.Close() | |
| // Get the user key from the HTTP headers | |
| userKeyStr := r.Header.Get("X-User-Key") | |
| if userKeyStr == "" { | |
| log.Println("User key not found") | |
| return | |
| } | |
| userKey := []byte(userKeyStr) | |
| // Create or get the user key from the userKeys map | |
| var mu sync.Mutex | |
| key, ok := userKeys[userKeyStr] | |
| if !ok { | |
| mu.Lock() | |
| key = &UserKey{} | |
| userKeys[userKeyStr] = key | |
| mu.Unlock() | |
| } | |
| // Generate a new AES cipher block using the user key | |
| block, err := aes.NewCipher(userKey) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| // Generate a new GCM AEAD cipher using the block | |
| aead, err := cipher.NewGCM(block) | |
| if err != nil { | |
| log.Println(err) | |
| return | |
| } | |
| // Read and write messages on the WebSocket connection | |
| for { | |
| // Read a message from the WebSocket connection | |
| _, msg, err := conn.ReadMessage() | |
| if err != nil { | |
| log.Println(err) | |
| break | |
| } | |
| // Decrypt the message using the AEAD cipher | |
| nonceSize := aead.NonceSize() | |
| if len(msg) < nonceSize { | |
| log.Println("Invalid message length") | |
| break | |
| } | |
| nonce, ciphertext := msg[:nonceSize], msg[nonceSize:] | |
| plaintext, err := aead.Open(nil, nonce, ciphertext, nil) | |
| if err != nil { | |
| log.Println(err) | |
| break | |
| } | |
| log.Printf("Received message: %s", plaintext) | |
| // Encrypt a message using the AEAD cipher | |
| nonce = make([]byte, nonceSize) | |
| if _, err := rand.Read(nonce); err != nil { | |
| log.Println(err) | |
| break | |
| } | |
| ciphertext = aead.Seal(nonce, nonce, plaintext, nil) | |
| msg = append(nonce, ciphertext...) | |
| log.Printf("Sending message: %s", msg) | |
| // Write the encrypted message to the WebSocket connection | |
| err = conn.WriteMessage(websocket.TextMessage, msg) | |
| if err != nil { | |
| log.Println(err) | |
| break | |
| } | |
| } | |
| // Delete the user key from the userKeys map when the connection is closed | |
| key.Lock() | |
| delete(userKeys, userKeyStr) | |
| key.Unlock() | |
| }) | |
| log.Fatal(http.ListenAndServe(":8080", nil)) | |
| } |
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