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#include <u.h>
#include <libc.h>
#include <mp.h>
#include <libsec.h>
#include <authsrv.h>
#include <bio.h>
#include "authcmdlib.h"
char authkey[DESKEYLEN];
int verb;
int usepass;
int convert(char*, char*, char*, int);
int dofcrypt(int, char*, char*, int);
void usage(void);
void randombytes(uchar*, int);
void
main(int argc, char *argv[])
{
Dir *d;
char *p, *np, *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, nil, 0, 1);
} else
getauthkey(authkey);
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");
np = malloc((len/OKEYDBLEN)*KEYDBLEN + KEYDBOFF);
if(!np)
error("out of memory");
if(read(fd, p, len) != len)
error("can't read key file: %r\n");
len = convert(p, np, key, len);
if(verb)
exits(0);
if(pwrite(fd, np, len, 0) != len)
error("can't write key file: %r\n");
close(fd);
exits(0);
}
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);
}
int
convert(char *p, char *np, char *key, int len)
{
int i, off, noff;
if(len % OKEYDBLEN)
fprint(2, "convkeys2: file odd length; not converting %d bytes\n",
len % KEYDBLEN);
len /= OKEYDBLEN;
for(i = 0; i < len; i ++){
off = i*OKEYDBLEN;
noff = KEYDBOFF+i*(KEYDBLEN);
decrypt(authkey, &p[off], OKEYDBLEN);
memmove(&np[noff], &p[off], OKEYDBLEN);
memset(&np[noff-SECRETLEN], 0, SECRETLEN);
if(verb)
print("%s\n", &p[off]);
}
randombytes((uchar*)np, KEYDBOFF);
len = (len*KEYDBLEN) + KEYDBOFF;
oldCBCencrypt(key, np, len);
return len;
}
void
usage(void)
{
fprint(2, "usage: convkeys2 keyfile\n");
exits("usage");
}
void
randombytes(uchar *p, int len)
{
int i, fd;
fd = open("/dev/random", OREAD);
if(fd < 0){
fprint(2, "convkeys2: 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);
}
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