buf[0] = ((unsigned char *) e->ctx)[3];
buf[1] = ((unsigned char *) e->ctx)[2];
buf[2] = ((unsigned char *) e->ctx)[1];
buf[3] = ((unsigned char *) e->ctx)[0];
etag = php_http_etag_digest(buf, 4);
buf[0] = ((unsigned char *) e->ctx)[3];
buf[1] = ((unsigned char *) e->ctx)[2];
buf[2] = ((unsigned char *) e->ctx)[1];
buf[3] = ((unsigned char *) e->ctx)[0];
etag = php_http_etag_digest(buf, 4);