124 	char *cap;  in mkcap()  local
136 	cap = emalloc(ncap);  in mkcap()
137 	snprint(cap, ncap, "%s@%s", from, to);  in mkcap()
139 	key = cap+nfrom+1+nto+1;  in mkcap()
143 	hmac_sha1((uchar*)cap, strlen(cap), (uchar*)key, strlen(key), hash, nil);  in mkcap()
148 		free(cap);  in mkcap()
152 	return cap;  in mkcap()
156 usecap(char *cap)  in usecap()  argument
163 	rv = write(fd, cap, strlen(cap));  in usecap()
171 	char *cap;  in becomeuser()  local
174 	cap = mkcap(getuser(), new);  in becomeuser()
175 	if(cap == nil)  in becomeuser()
177 	rv = usecap(cap);  in becomeuser()
178 	free(cap);  in becomeuser()