A cryptography library and a SharedPreferences wrapper for Android that encrypts the content with 256 bit AES encryption. The Encryption key is securely stored in device's KeyStore.
there's a concurrency issue while decrypting/encrypting something by keystore keys at the same time like below. So I added some code fragments that you can test it and added synchronization and retry logic to resolve the issue. Please review it seriously.
It is my app's most important issue.
2018-12-27 14:12:20.278 14509-14624/devliving.online.securedpreferencestoresample W/System.err: javax.crypto.IllegalBlockSizeException
2018-12-27 14:12:20.278 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at android.security.keystore.AndroidKeyStoreCipherSpiBase.engineDoFinal(AndroidKeyStoreCipherSpiBase.java:519)
2018-12-27 14:12:20.278 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at javax.crypto.Cipher.doFinal(Cipher.java:1736)
2018-12-27 14:12:20.278 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at devliving.online.securedpreferencestore.EncryptionManager.encryptAES(EncryptionManager.java:404)
2018-12-27 14:12:20.278 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at devliving.online.securedpreferencestore.EncryptionManager.encrypt(EncryptionManager.java:245)
2018-12-27 14:12:20.279 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at devliving.online.securedpreferencestore.EncryptionManager.tryEncrypt(EncryptionManager.java:178)
2018-12-27 14:12:20.279 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at devliving.online.securedpreferencestore.EncryptionManager.encrypt(EncryptionManager.java:290)
2018-12-27 14:12:20.279 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at devliving.online.securedpreferencestore.SecuredPreferenceStore$Editor.putString(SecuredPreferenceStore.java:299)
2018-12-27 14:12:20.279 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at devliving.online.securedpreferencestoresample.MainActivity.saveData(MainActivity.java:161)
2018-12-27 14:12:20.279 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at devliving.online.securedpreferencestoresample.MainActivity$3$1.run(MainActivity.java:84)
2018-12-27 14:12:20.279 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at java.lang.Thread.run(Thread.java:764)
2018-12-27 14:12:20.279 14509-14624/devliving.online.securedpreferencestoresample W/System.err: Caused by: android.security.KeyStoreException: Invalid operation handle
2018-12-27 14:12:20.279 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at android.security.KeyStore.getKeyStoreException(KeyStore.java:1137)
2018-12-27 14:12:20.280 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at android.security.keystore.KeyStoreCryptoOperationChunkedStreamer.update(KeyStoreCryptoOperationChunkedStreamer.java:132)
2018-12-27 14:12:20.280 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at android.security.keystore.KeyStoreCryptoOperationChunkedStreamer.doFinal(KeyStoreCryptoOperationChunkedStreamer.java:217)
2018-12-27 14:12:20.280 14509-14624/devliving.online.securedpreferencestoresample W/System.err: at android.security.keystore.AndroidKeyStoreCipherSpiBase.engineDoFinal(AndroidKeyStoreCipherSpiBase.java:506)
2018-12-27 14:12:20.280 14509-14624/devliving.online.securedpreferencestoresample W/System.err: ... 9 more
there's a concurrency issue while decrypting/encrypting something by keystore keys at the same time like below. So I added some code fragments that you can test it and added synchronization and retry logic to resolve the issue. Please review it seriously. It is my app's most important issue.