gistfile1.txt

In IdempotentRedeliveryPolicy

    private String getIdForEvent(MuleEvent event) throws Exception
    {
        if (useSecureHash)
        {
            Object payload = event.getMessage().getPayload();
            byte[] bytes = (byte[]) objectToByteArray.transform(payload);
            if (payload instanceof InputStream)
            {
                // We've consumed the stream.
                event.getMessage().setPayload(bytes);
            }
            MessageDigest md = MessageDigest.getInstance(messageDigestAlgorithm);
            byte[] digestedBytes = md.digest(bytes);
            return (String)byteArrayToHexString.transform(digestedBytes);
        }
        else
        {
             return event.getMuleContext().getExpressionManager().parse(idExpression, event, true);
        }
    }