Subversion Repositories planix.SVN

#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);
}