Encrypt in React Native, decrypt in Java

Question

I need an easy solution for encrypt a string in AES from my React Native app, send to the server and the decrypt from there with Java. I found some solutions but I am not able to make it works... Thanks a lot!

I found some solutions but I am not able to make it works... please provide more details (e. g. code in React and in Java), otherwise we're guessing. Regardless that - are you trying something where https in not enough? — gusto2
– gusto2, Commented Jul 15, 2021 at 15:18

P. Brew · Accepted Answer · 2021-07-08 16:28:27Z

1

For the Javascript/React Native side I've used crypto-js before which should just be a couple lines of code to implement.

npm install crypto-js

Then in your code

import AES from 'crypto-js/aes'

const stringToEncrypt = 'my string';
const secretKey = 'secret key 123';
const encryptedString = AES.encrypt(stringToEncrypt, secretKey).toString();

Then you can send encryptedString to your server, prefereably via https using something like Axios or Fetch

edited Jul 8, 2021 at 16:28

answered Jul 8, 2021 at 15:42

P. Brew

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3 Comments

Flavio Spugna Over a year ago

Thx, almost all the examples I found with AES are using a secret key with salt and an Initialization vector. I try to replicate the same then in Java, but the encrypted strings I get are different. In your example, do you know how to read that in Java?

P. Brew Over a year ago

On reflection yes you will need a key to encrypt via AES. You could store this securely on the server and in your React Native code using environment variables to keep it secure. I have updated my answer accordingly. My Java isn't great so I would suggest looking up decryption using Cypher (import javax.crypto.Cipher) docs.oracle.com/javase/7/docs/api/javax/crypto/Cipher.html

Rahul.S Over a year ago

In my case secret key is placed in a keystore file, how can i read and access key from it in order to use in react native to encrypt my plain text

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