aegis_aes_round
m ^= aegis_aes_round(st.v[4]);
st.v[4] ^= aegis_aes_round(st.v[3]);
st.v[3] ^= aegis_aes_round(st.v[2]);
st.v[2] ^= aegis_aes_round(st.v[1]);
st.v[1] ^= aegis_aes_round(st.v[0]);