#include <u.h>#include <libc.h>#include <auth.h>#include "authsrv.h" char	authkey[DESKEYLEN];int	verb;int	usepass; int	convert(char*, char*, int);int	dofcrypt(int, char*, char*, int);void	usage(void); voidmain(int argc, char *argv[]){	Dir d;	char *p, *file, key[DESKEYLEN];	int fd, len; 	ARGBEGIN{	case 'v':		verb = 1;		break;	case 'p':		usepass = 1;		break;	default:		usage();	}ARGEND 	if(argc != 1)		usage();	file = argv[0]; 	/* get original key */	if(usepass){		print("enter password file is encoded with\n");		getpass(authkey, 0);	} else		getauthkey(authkey);	print("enter password to reencode with\n");	getpass(key, 0); 	fd = open(file, ORDWR);	if(fd < 0)		error("can't open %s: %r\n", file);	if(dirfstat(fd, &d) < 0)		error("can't stat %s: %r\n", file);	len = d.length;	p = malloc(len);	if(!p)		error("out of memory");	if(read(fd, p, len) != len)		error("can't read key file: %r\n");	len = convert(p, key, len);	if(verb)		exits(0);	if(seek(fd, 0, 0) < 0 || write(fd, p, len) != len)		error("can't write key file: %r\n");	close(fd);	exits(0);} intconvert(char *p, char *key, int len){	int i; 	if(len % KEYDBLEN){		fprint(2, "file odd length; not converting %d bytes\n", len % KEYDBLEN);		len -= len % KEYDBLEN;	}	for(i = 0; i < len; i += KEYDBLEN){		decrypt(authkey, &p[i], KEYDBLEN);		if(verb)			print("%s\n", &p[i]);		else			encrypt(key, &p[i], KEYDBLEN);	}	return len;} voidusage(void){	fprint(2, "usage: convkeys keyfile\n");	exits("usage");}