bcunlock.c

加密解密,安全工具！很有意思的代码

/*******************************************************************
*
*      Copyright (c) 1994-1999 Jetico, Inc., Finland
*      All rights reserved.
*
*      File: bcunlock.c
*      Revision: $Id: bcunlock.c,v 1.6 2002/10/29 07:11:31 crypt Rel-1.6-3 $
*      Created:
*      Description: implementation of container info routine
*
*******************************************************************/


#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "header.h"
#include "config.h"
#include "bctool.h"
#include "misc.h"
#include "error.h"

char bcunlock_c[]="$Id: bcunlock.c,v 1.6 2002/10/29 07:11:31 crypt Rel-1.6-3 $";

int bcunlock (int argc, char ** argv)
{

    struct HiddenSector  hs;
    int fd;

    if ( argc < 2 )
    {
        msg(stderr,"Please specify container name\n"); 
        return -1; 
    }
    else if ( argc > 2 )
    {
        msg(stderr,"Too many parameters\n");
        return -1;
    }

    if ( (fd = open(argv[1], O_RDONLY|O_LARGEFILE)) < 0 )
    {
        msg(stderr,"open(\"%s\",O_RDWR): %s\n",argv[1],strerror(errno));
        return -1; 
    }
    if ( read(fd, &hs, sizeof(hs))!=sizeof(hs) )
    {
        msg(stderr,"Can not read container header\n");
        close(fd);
        return -1; 
    }
    if ( strncmp(hs.br.OEMid, "LOCOS94 ", sizeof(hs.br.OEMid))!=0 )
    {
        msg(stderr,"%s is not valid BestCrypt container\n",argv[0]);
        close(fd);
        return -1;
    }
    if (-1 == unlock_container(argv[1]))
    {
        msg(stderr,"unlock_container(\"%s\"): %s\n",argv[1],strerror(errno));
    }

    close(fd);
    return 0;
}