#include <u.h>#include <libc.h>#include <ctype.h>#include <authsrv.h>#include <mp.h>#include <libsec.h>#include <bio.h>#include "authcmdlib.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 'p':		usepass = 1;		break;	case 'v':		verb = 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, nil, 0, 1);	} else		getauthkey(authkey);	if(!verb){		print("enter password to reencode with\n");		getpass(key, nil, 0, 1);	} 	fd = open(file, ORDWR);	if(fd < 0)		error("can't open %s: %r\n", file);	d = dirfstat(fd);	if(d == nil)		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(pwrite(fd, p, len, 0) != len)		error("can't write key file: %r\n");	close(fd);	exits(0);} voidrandombytes(uchar *p, int len){	int i, fd; 	fd = open("/dev/random", OREAD);	if(fd < 0){		fprint(2, "convkeys: can't open /dev/random, using rand()\n");		srand(time(0));		for(i = 0; i < len; i++)			p[i] = rand();		return;	}	read(fd, p, len);	close(fd);} voidoldCBCencrypt(char *key7, char *p, int len){	uchar ivec[8];	uchar key[8];	DESstate s; 	memset(ivec, 0, 8);	des56to64((uchar*)key7, key);	setupDESstate(&s, key, ivec);	desCBCencrypt((uchar*)p, len, &s);} voidoldCBCdecrypt(char *key7, char *p, int len){	uchar ivec[8];	uchar key[8];	DESstate s; 	memset(ivec, 0, 8);	des56to64((uchar*)key7, key);	setupDESstate(&s, key, ivec);	desCBCdecrypt((uchar*)p, len, &s); } static intbadname(char *s){	int n;	Rune r; 	for (; *s != '\0'; s += n) {		n = chartorune(&r, s);		if (n == 1 && r == Runeerror)			return 1;	}	return 0;} intconvert(char *p, char *key, int len){	int i; 	len -= KEYDBOFF;	if(len % KEYDBLEN){		fprint(2, "convkeys: file odd length; not converting %d bytes\n",			len % KEYDBLEN);		len -= len % KEYDBLEN;	}	len += KEYDBOFF;	oldCBCdecrypt(authkey, p, len);	for(i = KEYDBOFF; i < len; i += KEYDBLEN)		if (badname(&p[i])) {			print("bad name %.30s... - aborting\n", &p[i]);			return 0;		}	if(verb)		for(i = KEYDBOFF; i < len; i += KEYDBLEN)			print("%s\n", &p[i]); 	randombytes((uchar*)p, 8);	oldCBCencrypt(key, p, len);	return len;} voidusage(void){	fprint(2, "usage: convkeys keyfile\n");	exits("usage");}