feat: implement end-to-end encryption for relay connections

packages/relay/src/base64.ts

@@ -0,0 +1,12 @@
+import { fromByteArray, toByteArray } from "base64-js";
+
+export function arrayBufferToBase64(buffer: ArrayBuffer): string {
+  return fromByteArray(new Uint8Array(buffer));
+}
+
+export function base64ToArrayBuffer(base64: string): ArrayBuffer {
+  const bytes = toByteArray(base64);
+  const out = new Uint8Array(bytes.byteLength);
+  out.set(bytes);
+  return out.buffer;
+}