Encrypt stream in chunks

src/crypto.ts

@@ -1,20 +1,33 @@
-import { Handshake } from "./handshake";
 import { Buffer } from "buffer";
+import { Handshake } from "./handshake";
 
 interface ReturnEncryptionWrapper {
   (source: Iterable<Uint8Array>): AsyncIterableIterator<Uint8Array>;
 }
 
+const maxPlaintextLength = 65519;
+
+
 // Returns generator that encrypts payload from the user
 export function encryptStream(handshake: Handshake): ReturnEncryptionWrapper {
   return async function * (source) {
     for await (const chunk of source) {
       const chunkBuffer = Buffer.from(chunk);
-      const data = await handshake.encrypt(chunkBuffer, handshake.session);
+
+
+      for (let i = 0; i < chunkBuffer.length; i += maxPlaintextLength) {
+        let end = i + maxPlaintextLength;
+        if (end > chunkBuffer.length) {
+          end = chunkBuffer.length;
+        }
+
+        const data = handshake.encrypt(chunkBuffer.slice(i, end), handshake.session);
         yield data;
       }
     }
   }
+}
+
 
 
 // Decrypt received payload to the user