OpenCard  
 
OCF, the OpenCard Framework is a standard Java framework for working with Smart Cards.  
 

com.ibm.opencard.crypto
Class DESCipher

java.lang.Object
  |
  +--com.ibm.opencard.crypto.DESCipher
public class DESCipher
extends java.lang.Object
implements FeedbackCipher

DESCipher does enciphers/deciphers data using the DES algorithm.

Version:
$Id: DESCipher.java,v 1.1 1999/12/02 16:06:02 damke Exp $

Field Summary
static int DECRYPT
          Cipher is in decrypting mode
static int ENCRYPT
          Cipher is in encrypting mode
static int UNINITIALIZED
          Cipher is not initialized yet
 
Constructor Summary
protected DESCipher(java.lang.String algorithm)
          Create a new DES cipher object.
 
Method Summary
 int engineBlockSize()
          Return the length of an input block in bytes.
 void engineInitDecrypt(java.security.Key key)
          Initialize for decryption.
 void engineInitEncrypt(java.security.Key key)
          Initialize for encryption.
 int engineOutBufferSize(int inLen, boolean isFinal)
          Return the length of an input block in bytes.
 int engineUpdate(byte[] in, int inOff, int inLen, byte[] out, int outOff)
          Process a chunk of data.
 byte[] getInitializationVector()
          Get the initialization vector.
 int getInitializationVectorLength()
          Get the initialization vector length.
static DESCipher getInstance(java.lang.String algorithm)
          Get an instance of DESCipher.
 void setInitializationVector(byte[] iv)
          Set the initialization vector.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

UNINITIALIZED

public static final int UNINITIALIZED
Cipher is not initialized yet

ENCRYPT

public static final int ENCRYPT
Cipher is in encrypting mode

DECRYPT

public static final int DECRYPT
Cipher is in decrypting mode
Constructor Detail

DESCipher

protected DESCipher(java.lang.String algorithm)
Create a new DES cipher object.
Parameters:
algorithm - the algorithm to be used
Method Detail

getInstance

public static DESCipher getInstance(java.lang.String algorithm)
                             throws java.security.NoSuchAlgorithmException
Get an instance of DESCipher.
Throws:
java.security.NoSuchAlgorithmException - The desired algorithm is not available.

getInitializationVector

public byte[] getInitializationVector()
Get the initialization vector.
Specified by:
getInitializationVector in interface FeedbackCipher
Returns:
the initialization vector for this cipher object

getInitializationVectorLength

public int getInitializationVectorLength()
Get the initialization vector length.
Specified by:
getInitializationVectorLength in interface FeedbackCipher
Returns:
the required size of the argument to setInitializationVector()

setInitializationVector

public void setInitializationVector(byte[] iv)
Set the initialization vector.
Specified by:
setInitializationVector in interface FeedbackCipher
Parameters:
iv - - intialization vector

engineBlockSize

public int engineBlockSize()
Return the length of an input block in bytes.

engineOutBufferSize

public int engineOutBufferSize(int inLen,
                               boolean isFinal)
Return the length of an input block in bytes.
Parameters:
inLen - the input length for which the output length shall be calculated.
isFinal - indicates whether the output length shall be calculated for the final encryption/decryption step or not.

engineInitEncrypt

public void engineInitEncrypt(java.security.Key key)
                       throws java.security.InvalidKeyException
Initialize for encryption.
Parameters:
key - - the key to be used for encryption.
Throws:
java.security.InvalidKeyException - The given key is invalid.

engineInitDecrypt

public void engineInitDecrypt(java.security.Key key)
                       throws java.security.InvalidKeyException
Initialize for decryption.
Parameters:
key - - the key to be used for encryption.
Throws:
java.security.InvalidKeyException - The given key is invalid.

engineUpdate

public int engineUpdate(byte[] in,
                        int inOff,
                        int inLen,
                        byte[] out,
                        int outOff)
Process a chunk of data.
Parameters:
in - - byte array from which the data to be processed shall be taken
inOff - - offset within the input array
inLen - - length of the part of input data to be processed
out - - byte array where output data shall be stored
outOff - - offset within the output array
Returns:
0 on success, 1 on error check this against JCE