@Override
    protected void engineInit(byte[] bytes, String format) throws IOException {
        if ((format == null) || format.equals("ASN.1")) {
            engineInit(bytes);
        } else {
            throw new IOException("Unsupported format: " + format);
        }
    }
Returns a non-cloned version of the IV.
common/src/main/java/org/conscrypt/GCMParameters.java