de.cscc.crypto.provider.spec
Class DESede3KeySpec

java.lang.Object
  de.cscc.crypto.provider.spec.DESede3KeySpec

All Implemented Interfaces:

Cloneable, DESKeySpec, KeySpec

public class DESede3KeySpec

extends Object

implements DESKeySpec, Cloneable

3 Key Triple DES secret keys specification (168 bit or 192 bit with parity) class.

This class is immutable.

Version:

$Revision: 1.8 $

Author:

Uwe Günther

Constructor Summary

DESede3KeySpec(byte[] key)
Creates a new DESede3KeySpec from a 24 bytes long byte array.

DESede3KeySpec(byte[] key, int offset)
Creates a new DESede3KeySpec from a 24 bytes long byte array.

DESede3KeySpec(DESede3KeySpec key)
Creates a new DESede3KeySpec from an existing one.

Method Summary

Object	clone() Creates and returns a deep copy of this object.
boolean	equals(Object obj) Indicates whether some other object is "equal to" this one.
byte[]	getKey() Get the DES Key as byte[24].
int	hashCode() Returns a hash code value for the object.
String	toString() Returns a string representation of the object.

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DESede3KeySpec

public DESede3KeySpec(byte[] key)
               throws InvalidKeyException

Creates a new DESede3KeySpec from a 24 bytes long byte array. We use the first 24 bytes in key as the key material for the DES key. The first (leftmost) DES key (key[0] to key[7]) is key1, the second (middle) DES key (key[8] to key[15]) is key2 and the third (rightmost) DES key (key[16] to key[13]) is key3.

Parameters:

key - the buffer with the three DES keys.

Throws:

InvalidKeyException - if the given key material is shorter than 24 bytes or the key is weak or semi weak.

DESede3KeySpec

public DESede3KeySpec(byte[] key,
                      int offset)
               throws InvalidKeyException

Creates a new DESede3KeySpec from a 24 bytes long byte array.

Parameters:

key - the buffer with the DES keys.

offset - the offset in key, where the key starts.

Throws:

InvalidKeyException - if the given key material is shorter than 24 bytes or the key is weak or semi weak.

DESede3KeySpec

public DESede3KeySpec(DESede3KeySpec key)

Creates a new DESede3KeySpec from an existing one.

Parameters:

key - DesKeySpec object with a key.

Method Detail

clone

public Object clone()
             throws CloneNotSupportedException

Creates and returns a deep copy of this object.

Returns:

a clone of this instance.

Throws:

CloneNotSupportedException - if the object's class does not support the Cloneable interface. Subclasses that override the clone method can also throw this exception to indicate that an instance cannot be cloned.

See Also:

Cloneable

equals

public boolean equals(Object obj)

Indicates whether some other object is "equal to" this one.

Parameters:

obj - the reference object with which to compare.

Returns:

true if this object is the same as the obj argument; false otherwise.

See Also:

hashCode(), Hashtable

hashCode

public int hashCode()

Returns a hash code value for the object. This method is supported for the benefit of hashtables such as those provided by java.util.Hashtable.

Returns:

a hash code value for this object.

See Also:

equals(java.lang.Object), Hashtable

toString

public String toString()

Returns a string representation of the object. The Format may catch (change in further releases.

Returns:

a string representation of the object.

getKey

public byte[] getKey()

Get the DES Key as byte[24].

Specified by:

getKey in interface DESKeySpec

Returns:

the DES Key as byte[24].