AH_FLENGTH
ah->ah_hl = (rplen + ahx->authsize - AH_FLENGTH) / sizeof(u_int32_t);
rplen = AH_FLENGTH + sizeof(u_int32_t);
if (hl * sizeof(u_int32_t) != ahx->authsize + rplen - AH_FLENGTH) {
rplen = AH_FLENGTH + sizeof(u_int32_t);
adjust = AH_FLENGTH + sizeof(u_int32_t);
AH_FLENGTH + sizeof(u_int32_t) + 32,