title: Cipher.updateAAD() below Java 7
body: <p>How can one use <code>cipher.updateAAD()</code> below API 19 (Java 7)? I know I can use BouncyCastle but it does not provide a backport for AEAD encryption and decryption. Are there any third-party libraries? I am using <code>AES/GCM/NoPadding</code>.</p>