POS_ATTRS
MD5Update(&ctx, &h->request[POS_ATTRS],
(MD5Len)(h->req_len - POS_ATTRS));
HMAC_Update(ctx, &h->request[POS_ATTRS],
(size_t)(h->req_len - POS_ATTRS));
if (h->resp_len < POS_ATTRS)
MD5Update(&ctx, &h->response[POS_ATTRS],
(MD5Len)(len - POS_ATTRS));
pos = POS_ATTRS;
HMAC_Update(hctx, &resp[POS_ATTRS],
(size_t)(h->resp_len - POS_ATTRS));
h->resp_pos = POS_ATTRS;
h->req_len = POS_ATTRS;