Hi, Why we need null skcipher to copy AAD from src to dst buffer. We can do the same with some function,who can copy data from src sg list to dst sg list. Regards Harsh Jain -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html