Created
April 22, 2023 13:16
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Websocket with encryption
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package main | |
import ( | |
"crypto/aes" | |
"crypto/cipher" | |
"encoding/base64" | |
"log" | |
"net/http" | |
"github.com/gorilla/websocket" | |
) | |
var upgrader = websocket.Upgrader{ | |
ReadBufferSize: 1024, | |
WriteBufferSize: 1024, | |
} | |
var aesKey = []byte("0123456789012345") // 16 bytes AES key | |
func main() { | |
http.HandleFunc("/", handleWebSocket) | |
log.Fatal(http.ListenAndServe(":8080", nil)) | |
} | |
func handleWebSocket(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() | |
// Generate a new AES cipher block using the key | |
block, err := aes.NewCipher(aesKey) | |
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 | |
} | |
} | |
} |
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