fun decryptingInputStream(inputStream: InputStream): InputStream {
        val cipher = newEncryptionSession().decryptingCipher(inputStream::read)
        return CipherInputStream(inputStream, cipher)
    }

    private
    fun encryptingOutputStream(outputStream: OutputStream): OutputStream {
        val cipher = newEncryptionSession().encryptingCipher(outputStream::write)
        return CipherOutputStream(outputStream, cipher)