You can use the crypto-js library https://github.com/brix/crypto-js . Works fine in React Native app.
npm install crypto-js
var CryptoJS = require("crypto-js");
var ciphertext = CryptoJS.AES.encrypt('my message', 'secret key 123');
console.log("encrypted text", ciphertext.toString());
var bytes = CryptoJS.AES.decrypt(ciphertext.toString(), 'secret key 123');
var plaintext = bytes.toString(CryptoJS.enc.Utf8);
console.log("decrypted text", plaintext);
source
share