66 lines
2.4 KiB
Kotlin
66 lines
2.4 KiB
Kotlin
package org.mosad.teapod.preferences
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import android.content.Context
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import android.content.SharedPreferences
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import android.security.keystore.KeyGenParameterSpec
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import android.security.keystore.KeyProperties
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import android.util.Log
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import androidx.security.crypto.EncryptedSharedPreferences
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import androidx.security.crypto.MasterKey
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import org.mosad.teapod.R
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object EncryptedPreferences {
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var login = ""
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internal set
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var password = ""
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internal set
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fun saveCredentials(login: String, password: String, context: Context) {
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this.login = login
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this.password = password
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with(getEncryptedPreferences(context)?.edit()) {
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this?.putString(context.getString(R.string.save_key_user_login), login)
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this?.putString(context.getString(R.string.save_key_user_password), password)
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this?.apply()
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}
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}
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fun readCredentials(context: Context) {
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with(getEncryptedPreferences(context)) {
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login = this?.getString(context.getString(R.string.save_key_user_login), "").toString()
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password = this?.getString(context.getString(R.string.save_key_user_password), "").toString()
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}
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}
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/**
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* create a encrypted shared preference
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*/
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private fun getEncryptedPreferences(context: Context): SharedPreferences? {
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return try {
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val spec = KeyGenParameterSpec.Builder(
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MasterKey.DEFAULT_MASTER_KEY_ALIAS,
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KeyProperties.PURPOSE_ENCRYPT or KeyProperties.PURPOSE_DECRYPT)
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.setBlockModes(KeyProperties.BLOCK_MODE_GCM)
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.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE)
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.setKeySize(MasterKey.DEFAULT_AES_GCM_MASTER_KEY_SIZE)
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.build()
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val masterKey = MasterKey.Builder(context)
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.setKeyGenParameterSpec(spec)
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.build()
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EncryptedSharedPreferences.create(
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context,
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context.getString(R.string.encrypted_preference_file_key),
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masterKey,
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EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
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EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
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)
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} catch (ex: Exception) {
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Log.e(javaClass.name, "Could not create encrypted shared preference.", ex)
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null
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}
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}
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} |