Thursday, 14 December 2017
IncreaseKeyModifier_6_0_0_1.java (Digested Increase Key Modifier Java source code file) Print E-mail
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//
// Creator:    http://www.dicelocksecurity.com
// Version:    vers.6.0.0.1
//
// Copyright (C) 2011-2012 DiceLock Security, LLC. All rights reserved.
//
//                               DISCLAIMER
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// DICELOCK IS A REGISTERED TRADEMARK OR TRADEMARK OF THE OWNERS.
//
// Environment:
// java version "1.6.0_29"
// Java(TM) SE Runtime Environment (build 1.6.0_29-b11)
// Java HotSpot(TM) Server VM (build 20.4-b02, mixed mode)
//
 
package com.dicelocksecurity.jdicelock.Cipher.SymmetricCipher.DiceLock.KeyModifier;
 
import com.dicelocksecurity.jdicelock.CryptoRandomStream.BaseCryptoRandomStream;
import com.dicelocksecurity.jdicelock.CryptoRandomStream.DefaultCryptoRandomStream;
import com.dicelocksecurity.jdicelock.TypeSizes;
 
import java.security.KeyManagementException;
 
/**
 * Class implementing Direct Increase Key Modifier class
 *
 * @author      Angel Ferré @ DiceLock Security
 * @version     6.0.0.1
 * @since       2011-10-30
 */
public class IncreaseKeyModifier_6_0_0_1 extends BaseKeyModifier {
 
    /**
     * Key modifier type enumerator name
     */
    private static final KeyModifiers keyModifierType = KeyModifiers.IncreaseKeyModifierType_6_0_0_1;
 
    /**
     * Initial key
     */
    private BaseCryptoRandomStream initialKey;
 
    /**
     * Points if initialKey has been created by object
     */
    private boolean autoInitialKey;
 
    /**
     * Constructor, default
     */
    public IncreaseKeyModifier_6_0_0_1() {
        super();
 
        this.initialKey = null;
        this.autoInitialKey = false;
    }
 
    /**
     * Destructor
     */
    public void finalize() {
 
        if (this.autoInitialKey) {
            this.autoInitialKey = false;
        }
        this.initialKey = null;
    }
 
    /**
     * Initializes object;
     */
    public void Initialize() {
 
        if (this.autoInitialKey) {
            this.initialKey = null;
            this.autoInitialKey = false;
        }
    }
 
    /**
     * Sets initial key
     */
    public void SetKey(BaseCryptoRandomStream key) {
 
        if ((!this.autoInitialKey) && (this.initialKey == null)) {
            this.initialKey = new DefaultCryptoRandomStream(key.GetBitLength());
            this.autoInitialKey = true;
        }
        key.Copy(this.initialKey);
    }
 
    /**
     * Gets symmetric key modified
     */
    public void GetModifiedKey(BaseCryptoRandomStream key) throws KeyManagementException {
        int indexUC;
        boolean finished;
        short x;
 
        finished = false;
        indexUC = 0;
        do {
            x = (short)((key.GetUCPosition(indexUC) & 0x00FF));
            if (x == 0x00FF) {
                key.SetUCPosition(indexUC, (byte)0);
                indexUC++;
            } else {
                x = (short)(x + 1);
                key.SetUCPosition(indexUC, (byte)(x & 0x00FF));
                finished = true;
            }
        } while ((indexUC < key.GetUCLength()) && (!finished));
        if (key.Equals(this.initialKey)) {
            throw new KeyManagementException();
        }
    }
 
    /**
     * Sets working buffer key to keep original key
     */
    public void SetWorkingKey(BaseCryptoRandomStream bufferKey) {
 
        this.initialKey = bufferKey;
        this.autoInitialKey = false;
    }
 
    /**
     * Gets working buffer key used to keep original key
     */
    public BaseCryptoRandomStream GetWorkingKey() {
 
        return this.initialKey;
    }
 
    /**
     * Removes working buffer key used to keep original key
     */
    public void RemoveWorkingKey() {
 
        if (this.autoInitialKey) {
            this.autoInitialKey = false;
        }
        this.initialKey = null;
    }
 
    /**
     * Gets key modifier type
     */
    public KeyModifiers GetKeyModifierType() {
 
        return IncreaseKeyModifier_6_0_0_1.keyModifierType;
    }
 
}