/interview-mobile

Encryption

  1. clone this repo
  2. create a new branch yourName-solution
  3. Write a one screen Flutter app that encrypts a user given text
  4. Submit a PR into master with your solution

encrypt

Requirements

  • The Generate Key Pair button should generate a proper RSA Key Pair
  • The View Private Key and View Public Key buttons should display the private key in the Display Text Box in PEM Key Format

Ex:

-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDMYfnvWtC8Id5bPKae5yXSxQTt
+Zpul6AnnZWfI2TtIarvjHBFUtXRo96y7hoL4VWOPKGCsRqMFDkrbeUjRrx8iL91
4/srnyf6sh9c8Zk04xEOpK1ypvBz+Ks4uZObtjnnitf0NBGdjMKxveTq+VE7BWUI
yQjtQ8mbDOsiLLvh7wIDAQAB
-----END PUBLIC KEY-----
  • The text to encrypt field should accept max 60 characters long.
  • The Encrypt Text button should encrypt the given text and display the encrypted text in the Display Text Box
  • The private key pair should be saved to Shared Preferences on initial creation
  • On app restart, if Key Pair is present in Shared Preferences, the Generate Key Pair button should be disabled and Key Pairs should be restored
  • Use any libraries you want

Bonus

Generate a random String and use this to encrypt the private key itself. How can you recover the private key if the device is lost?