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#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);
void
main(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);
}
void
randombytes(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);
}
void
oldCBCencrypt(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);
}
void
oldCBCdecrypt(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 int
badname(char *s)
{
int n;
Rune r;
for (; *s != '\0'; s += n) {
n = chartorune(&r, s);
if (n == 1 && r == Runeerror)
return 1;
}
return 0;
}
int
convert(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;
}
void
usage(void)
{
fprint(2, "usage: convkeys keyfile\n");
exits("usage");
}
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