Introduce useCrypto composable for encryption and decryption with RSA

src/composables/useCrypto.ts

@@ -0,0 +1,18 @@
+import { JSEncrypt } from 'jsencrypt';
+const secret = import.meta.env.VITE_SECRET;
+
+if (!secret) {
+  throw new Error('VITE_SECRET is not set');
+}
+const crypt = new JSEncrypt();
+crypt.setPrivateKey(secret);
+
+export function useCrypto() {
+  const encrypt = (value: string) => crypt.encrypt(value);
+  const decrypt = (value: string) => crypt.decrypt(value);
+
+  return {
+    encrypt,
+    decrypt,
+  };
+}