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package me.texx.Texx
import android.content.Context
import android.preference.PreferenceManager
import android.util.Base64
import com.kazakago.cryptore.CipherAlgorithm
import com.kazakago.cryptore.Cryptore
import com.madapps.prefrences.EasyPrefrences
/**
* Class for saving data securely in SharedPreferences
*/
class SecureStorage(private val context: Context) {
/**
* Encrypts and saves the [value] with [key] as index
*/
fun set(key: String, value: String) {
sharedPrefs.putString(key, encryptAES(value))
}
/**
* Finds the encrypted value by [key], decrypts it and returns the value as string
*/
fun get(key: String): String? {
return try {
decryptAES(sharedPrefs.getString(key))
} catch (e: Exception) {
null
}
}
private val sharedPrefs = EasyPrefrences(context)
private enum class Alias(val value: String) {
RSA("CIPHER_RSA"),
AES("CIPHER_AES")
}
private val cryptoreAES: Cryptore by lazy {
val builder = Cryptore.Builder(alias = Alias.AES.value, type = CipherAlgorithm.AES)
builder.build()
}
private fun encryptAES(plainStr: String): String {
val plainByte = plainStr.toByteArray()
val result = cryptoreAES.encrypt(plainByte = plainByte)
cipherIV = result.cipherIV
return Base64.encodeToString(result.bytes, Base64.DEFAULT)
}
private fun decryptAES(encryptedStr: String): String {
val encryptedByte = Base64.decode(encryptedStr, Base64.DEFAULT)
val result = cryptoreAES.decrypt(encryptedByte = encryptedByte, cipherIV = cipherIV)
return String(result.bytes)
}
private var cipherIV: ByteArray?
get() {
val preferences = PreferenceManager.getDefaultSharedPreferences(this.context)
preferences.getString("cipher_iv", null)?.let {
return Base64.decode(it, Base64.DEFAULT)
}
return null
}
set(value) {
val preferences = PreferenceManager.getDefaultSharedPreferences(this.context)
val editor = preferences.edit()
editor.putString("cipher_iv", Base64.encodeToString(value, Base64.DEFAULT))
editor.apply()
}
}
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