Our great sponsors
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aes-js
A pure JavaScript implementation of the AES block cipher and all common modes of operation for node.js or web browsers.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
If you wish to encrypt the user's session information, you can use aes-js and store the encryption key in Expo SecureStore. The aes-js library is a reputable JavaScript-only implementation of the AES encryption algorithm in CTR mode. A new 256-bit encryption key is generated using the react-native-get-random-valueslibrary. This key is stored inside Expo's SecureStore, while the value is encrypted and placed inside AsyncStorage.
Once we've set up the storage mechanism, building an email and password sign in flow becomes pretty straight forward. Install react-native-elements to get some nice cross platform button and input fields: