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// $Id: Ssh.java,v 1.3 2002/03/21 22:44:05 rees Exp $
//
// Ssh.java
// SSH / smartcard integration project, smartcard side
//
// Tomoko Fukuzawa, created, Feb., 2000
//
// Naomaru Itoi, modified, Apr., 2000
//
// copyright 2000
// the regents of the university of michigan
// all rights reserved
//
// permission is granted to use, copy, create derivative works
// and redistribute this software and such derivative works
// for any purpose, so long as the name of the university of
// michigan is not used in any advertising or publicity
// pertaining to the use or distribution of this software
// without specific, written prior authorization. if the
// above copyright notice or any other identification of the
// university of michigan is included in any copy of any
// portion of this software, then the disclaimer below must
// also be included.
//
// this software is provided as is, without representation
// from the university of michigan as to its fitness for any
// purpose, and without warranty by the university of
// michigan of any kind, either express or implied, including
// without limitation the implied warranties of
// merchantability and fitness for a particular purpose. the
// regents of the university of michigan shall not be liable
// for any damages, including special, indirect, incidental, or
// consequential damages, with respect to any claim arising
// out of or in connection with the use of the software, even
// if it has been or is hereafter advised of the possibility of
// such damages.
import javacard.framework.*;
import javacardx.framework.*;
import javacardx.crypto.*;
public class Ssh extends javacard.framework.Applet
{
// Change this when the applet changes; hi byte is major, low byte is minor
static final short applet_version = (short)0x0102;
/* constants declaration */
// code of CLA byte in the command APDU header
static final byte Ssh_CLA =(byte)0x05;
// codes of INS byte in the command APDU header
static final byte DECRYPT = (byte) 0x10;
static final byte GET_KEYLENGTH = (byte) 0x20;
static final byte GET_PUBKEY = (byte) 0x30;
static final byte GET_VERSION = (byte) 0x32;
static final byte GET_RESPONSE = (byte) 0xc0;
static final short keysize = 1024;
static final short root_fid = (short)0x3f00;
static final short privkey_fid = (short)0x0012;
static final short pubkey_fid = (short)(('s'<<8)|'h');
/* instance variables declaration */
AsymKey rsakey;
CyberflexFile file;
CyberflexOS os;
private Ssh()
{
file = new CyberflexFile();
os = new CyberflexOS();
rsakey = new RSA_CRT_PrivateKey (keysize);
if ( ! rsakey.isSupportedLength (keysize) )
ISOException.throwIt (ISO.SW_WRONG_LENGTH);
register();
} // end of the constructor
public boolean select() {
if (!rsakey.isInitialized())
rsakey.setKeyInstance ((short)0xc8, (short)0x10);
return true;
}
public static void install(APDU apdu)
{
new Ssh(); // create a Ssh applet instance (card)
} // end of install method
public static void main(String args[]) {
ISOException.throwIt((short) 0x9000);
}
public void process(APDU apdu)
{
// APDU object carries a byte array (buffer) to
// transfer incoming and outgoing APDU header
// and data bytes between card and CAD
byte buffer[] = apdu.getBuffer();
short size, st;
// verify that if the applet can accept this
// APDU message
// NI: change suggested by Wayne Dyksen, Purdue
if (buffer[ISO.OFFSET_INS] == ISO.INS_SELECT)
ISOException.throwIt(ISO.SW_NO_ERROR);
switch (buffer[ISO.OFFSET_INS]) {
case DECRYPT:
if (buffer[ISO.OFFSET_CLA] != Ssh_CLA)
ISOException.throwIt(ISO.SW_CLA_NOT_SUPPORTED);
//decrypt (apdu);
size = (short) (buffer[ISO.OFFSET_LC] & 0x00FF);
if (apdu.setIncomingAndReceive() != size)
ISOException.throwIt (ISO.SW_WRONG_LENGTH);
// check access; depends on bit 2 (x/a)
file.selectFile(root_fid);
file.selectFile(privkey_fid);
st = os.checkAccess(ACL.EXECUTE);
if (st != ST.ACCESS_CLEARED) {
CyberflexAPDU.prepareSW1SW2(st);
ISOException.throwIt(CyberflexAPDU.getSW1SW2());
}
rsakey.cryptoUpdate (buffer, (short) ISO.OFFSET_CDATA, size,
buffer, (short) ISO.OFFSET_CDATA);
apdu.setOutgoingAndSend ((short) ISO.OFFSET_CDATA, size);
break;
case GET_PUBKEY:
file.selectFile(root_fid); // select root
file.selectFile(pubkey_fid); // select public key file
size = (short)(file.getFileSize() - 16);
st = os.readBinaryFile(buffer, (short)0, (short)0, size);
if (st == ST.SUCCESS)
apdu.setOutgoingAndSend((short)0, size);
else {
CyberflexAPDU.prepareSW1SW2(st);
ISOException.throwIt(CyberflexAPDU.getSW1SW2());
}
break;
case GET_KEYLENGTH:
Util.setShort(buffer, (short)0, keysize);
apdu.setOutgoingAndSend ((short)0, (short)2);
break;
case GET_VERSION:
Util.setShort(buffer, (short)0, applet_version);
apdu.setOutgoingAndSend ((short)0, (short)2);
break;
case GET_RESPONSE:
break;
default:
ISOException.throwIt (ISO.SW_INS_NOT_SUPPORTED);
}
} // end of process method
} // end of class Ssh
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