Understanding React Native Encryption Libraries

In this article, we will explore the usage of encryption libraries in React Native apps. We will be using Expo to set up our apps.

RSA Encryption

RSA encryption is a well-known cryptography algorithm. It is used by protocols like HTTPS and SSH due to its robustness. RSA encryption relies on the use of large prime numbers for security. The encryption process involves generating a public key and a private key. The public key is used to encrypt the message, while the private key is used to decrypt it.

Initialization Vectors

Initialization vectors (IVs) are important in encryption algorithms. If the same IV is used for multiple encryption operations, it can make it easier for attackers to decrypt the ciphertext without knowing the secret key. IVs add randomness to the encryption starting point, making it more secure.

Salts

Salts are random strings of characters that are added to passwords before they are hashed. This adds an extra layer of security by making it harder for attackers to crack passwords, even if they have pre-computed hashes (such as rainbow tables). Salts change the output of the hashing function, making different hashed passwords for the same input.

Expo SecureStore

Expo SecureStore is a library provided by the Expo team. It allows developers to encrypt and store key-value pairs in device storage. SecureStore is easy to use and has clear documentation. It is actively maintained and supported by the Expo team. However, it has a limitation of storing key-value pairs up to 2MB in size.

React Native MMKV Storage

React Native MMKV Storage is another option for saving data locally in React Native apps. This library is not compatible with recent versions of React Native and requires an upgrade to the project's React Native version.

React Native Keychain

React Native Keychain is a library developed by Oblador. It provides a secure way to store credentials in React Native apps. It is frequently updated and supports biometrics like FaceID or fingerprints. React Native Keychain also has support for access control, allowing data to be decrypted only in specific situations.

RNES

RNES (React Native Encryption Service) is an encryption library that provides an asynchronous interface for encryption. It is considered a secure alternative to async storage. However, one drawback is that the project is not frequently updated.

Overall, there are several encryption libraries available for React Native apps. Each library has its own advantages and limitations, so it's important to choose the one that best fits your project's requirements.