Securing Android App with Encrypted SharedPreferences

Generally data is saved in this way in Android devices.

<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<map>
    <boolean name="googleMapShow" value="true" />
    <int name="dateFormat" value="7" />
    <boolean name="isShowTemperature" value="true" />
    <boolean name="isShowLevelIndicator" value="false" />
    <string name="language">en</string>
    <int name="latLongFormat" value="2" />
    <boolean name="isShowDate" value="true" />
    <int name="selectedTemplate" value="0" />
    <boolean name="isShowShortAddress" value="true" />
    <boolean name="firstTime" value="false" />
    <boolean name="isShowLongAddress" value="true" />
    <boolean name="isShowLatLong" value="true" />
    <boolean name="isShowTime" value="true" />
    <int name="temperatureFormat" value="1" />
    <int name="timeFormat" value="8" />
    <int name="googleMapType" value="1" />
</map>

But when we use Encrypted SharedPreferences.

<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<map>
    <string name="__androidx_security_crypto_encrypted_prefs_key_keyset__">12a901bc682e67316d97810d5c4ed741daaeddd8877e30137e1b60d4094b04a6ff0bd27c351334ece9568e0b6a3d4b0de494c5577cd71a614e4198c02b8ce62626579ff52740fb41336fe4b012861f5b0533668d2642db6c45025f4428cf6fcd1aba151e991a4e1785dbd0848c8ded29a7540ad8a31236fd40b8c4ec9fa08b5ddf07ed49d6ffb42dbfa98c1a9a06c929f46120bcc6c563e82714e2f4134915b989ed0e75036428bcec24d37d1a4408d2a9e1c304123c0a30747970652e676f6f676c65617069732e636f6d2f676f6f676c652e63727970746f2e74696e6b2e4165735369764b6579100118d2a9e1c3042001</string>
    <string name="AUh4VNJxfVMtKEShUAH66Y/Wd6tacepdmB51suathcQ+YCrsu4hZ0Xg=">ARpRaxiHZmU9NmpOYhXGsKFWh0Q5gfG1YtjOZ+/ET0vY/zU4Pe4=</string>
    <string name="AUh4VNJW7atm/QULrLCmY/d2aNzirJKQGNOA3WOPUb0=">ARpRaxipyG/6dldVpNFeXh4JEO+NjL6JxmH24TTQVBj1xDVt4YKpEK8=</string>
    <string name="AUh4VNJyHr2mLKGjNgD1KKyjYWNeUMCaUEwd9BTrIk/ycU9l">ARpRaxhaVtgbMw1OzeIB/+3Nywr2+DM4pzP8S9M3Jd0Qd3bvKtQXBN4=</string>
    <string name="__androidx_security_crypto_encrypted_prefs_value_keyset__">128801cb3c76b722706eeed2f367d681c440c160a4cad6d6279d87eb1ae86494ac213f596c289d9b677f1aff5d6152fbf777fe5e57319363213e1ad6dea868e104cc6c3772924516f3e6026e863dcf3a29547876e83c833e6d7a711c86fec53a9445c09bfbe47fb3bf3d3b5339ef9c80da7a7198a6c9a2736e9a55f2039a455ddaf7fce792200904df97921a440898d6c5d201123c0a30747970652e676f6f676c65617069732e636f6d2f676f6f676c652e63727970746f2e74696e6b2e41657347636d4b657910011898d6c5d2012001</string>
    <string name="AUh4VNLEMzO0ZEzywCdpX5nBzKTXdomqrA86p2Qz1hNg3DniJQw=">ARpRaxi7ULeVm2XWXKuSkU/0EzQKvdlou87SmUcBW4iaZMRvBgk=</string>
    <string name="AUh4VNLBzx1AEDT0DKye1uJvGOy0pDUu/+5L4EVNp6VeMFd7Ua8=">ARpRaxg8hP0mELpEOwh0nfVD6wd1K8FEt78EjzdWESkBk+nY0hE=</string>
    <string name="AUh4VNKRI5oaAyh3ukO1nrUvZOyznA8Wq1PUU0kZ1g==">ARpRaxi3ROeOi0fEMQ4i4Px+1ryY+adkx7aG5zBBWwD+9hPfv20=</string>
    <string name="AUh4VNJG2G6tiib4AgyC1Zyp+JB0fwinTJRyTkvooQ==">ARpRaxgClZXUx9+dAt8DPN/pWap8QTWm5cGiIMwB0OHDNPZJs2gMu60=</string>
    <string name="AUh4VNL4/Rv9MNzDJTM5VPM9seA71pP1sIqt13XGC5oSj60ToE/g">ARpRaxgk4Eg5Ssh8jV4w8BDdKjFDZ1pD3V6P6PJRtiJMpTXckmw=</string>
    <string name="AUh4VNLOvgbmqRDmi7BBk8+/1F/FJ7H6rsoNl2B3MBl/7g==">ARpRaxipnE2qdflE/X7dQYbNBtu7NxptAfmdz8+J/lBODO0kqSU=</string>
    <string name="AUh4VNK3nOPZuU3qgLFBAX1rs08LgLF3DKeCCbNK">ARpRaxghDuvQTvR+sH3qge7h9t7SZH4WITftmnA9jpZuizdDTzE=</string>
    <string name="AUh4VNJ6aLMPosbF9bIT1f8h3KkBDKsNjH3TNa/9">ARpRaxgTIDlUlcqBurlhjMIBiWdYd/Iv/XafyPYAX+4FbElm+b8yEys=</string>
</map>

Add the required dependencies to your build.gradle file:

dependencies {
    implementation("androidx.security:security-crypto:1.1.0-alpha06")
}

  fun init(context : Context) {
   
        val masterKeyAlias = MasterKey.Builder(context)
            .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
            .build()

        this.preferences = EncryptedSharedPreferences.create(
            context,
            SHARED_PREFERENCE_FILE_NAME,
            masterKeyAlias,
            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
        )

    }

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License

Copyright: 
~ Rossyn
~ Rohitraj Khorwal

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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