CryptoManager.kt

class CryptoManager(context: Context) {
    private val aead = AndroidKeysetManager.Builder()
        .withSharedPref(context, "master_keyset", "master_key_preference")
        .withKeyTemplate(KeyTemplates.get("AES128_GCM_HKDF_4KB"))
        .withMasterKeyUri("android-keystore://master_key")
        .build()
        .keysetHandle
        .getPrimitive(StreamingAead::class.java)
    fun encrypt(outputStream: OutputStream): OutputStream {
        return aead.newEncryptingStream(outputStream, ByteArray(0))
    }
    fun decrypt(inputStream: InputStream): InputStream {
        return aead.newDecryptingStream(inputStream, ByteArray(0))
    }
}