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1@TargetApi(23)
2fun createAndroidKeyStoreSymmetricKey(alias: String): SecretKey {
3    val keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore")
4    val builder = KeyGenParameterSpec.Builder(alias, KeyProperties.PURPOSE_ENCRYPT or KeyProperties.PURPOSE_DECRYPT)
5            .setBlockModes(KeyProperties.BLOCK_MODE_CBC)
6            .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_PKCS7)
7    keyGenerator.init(builder.build())
8    return keyGenerator.generateKey()
9}
10
11fun getAndroidKeyStoreSymmetricKey(alias: String): SecretKey? = keyStore.getKey(alias, null) as SecretKey?