@Override
    public SSLEngineResult unwrap(ByteBuffer src, ByteBuffer dst) throws SSLException {
        synchronized (ssl) {
            try {
                return unwrap(singleSrcBuffer(src), singleDstBuffer(dst));
            } finally {
                resetSingleSrcBuffer();
                resetSingleDstBuffer();
            }
        }
    }
Work-around to allow this method to be called on older versions of Android.
common/src/main/java/org/conscrypt/ConscryptEngine.java