Tuesday, 17 October 2017
RunsTest.java (Runs random number test 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.RandomTest;
 
import com.dicelocksecurity.jdicelock.CryptoRandomStream.BaseCryptoRandomStream;
 
/**
 * Class implementing Runs random number test
 *
 * @author      Angel Ferré @ DiceLock Security
 * @version     6.0.0.1
 * @since       2011-09-30
 */
public class RunsTest extends BaseRandomTest {
 
    /**
     * Random Test Class enumerator name
     */
    protected static final RandomTests TEST = RandomTests.Runs;
 
    /**
     * Random Test Class minimum stream length
     */
    protected static final int MINIMUMLENGTH = 100;
 
    /**
     * "pi" result
     */
    protected double pi;
 
    /**
     * "totalNumberRuns" result, total number of runs
     */
    protected double totalNumberRuns;
 
    /**
     * "argument" result, parameter for error function in double precision
     */
    protected double argument;
 
    /**
     * Constructor, default
     */
    public RunsTest() {
 
        super();
 
        this.pi = 0.0;
        this.totalNumberRuns = 0.0;
        this.argument = 0.0;
    }
 
    /**
     * Constructor with a MathematicalFunctions object instantiated
     *
     * @param     mathFuncObj   mathematicalFunctions object that will be used by this object
     */
    public RunsTest(MathematicalFunctions mathFuncObj) {
 
        super(mathFuncObj);
 
        this.pi = 0.0;
        this.totalNumberRuns = 0.0;
        this.argument = 0.0;
    }
 
    /**
     * Destructor, zeroes all data
     *
     */
    public void finalize() {
 
        this.pi = 0.0;
        this.totalNumberRuns = 0.0;
        this.argument = 0.0;
    }
 
    /**
     * Gets the BaseRandomTest random state of the last executed BaseCryptoRandomStream
     *
     * @return    boolean indication if last computed CryptoRandomStream was a randomized stream
     *            true:   last verified stream was randomized
     *            false:  last verified stream was not randomized
     */
    public boolean IsRandom() {
 
        return super.IsRandom();
    }
 
    /**
     * Tests the BaseCryptoRandomStream executed and returns the random value
     *
     * @param     bitStream   bitStream to be verified for randomness properties
     * @return    boolean     indication if CryptoRandomStream is a randomized stream
     *            true:       last verified stream was randomized
     *            false:      last verified stream was not randomized
     */
    public boolean IsRandom(BaseCryptoRandomStream bitStream) {
        int i, r[];
        double product, sum;
 
        if (bitStream.GetBitLength() < this.GetMinimumLength()) {
            this.error = RandomTestErrors.InsufficientNumberOfBits;
            this.random = false;
            return this.random;
        }
        bitStream.SetBitPosition(0);
        this.error = RandomTestErrors.NoError;
        r = new int[bitStream.GetBitLength()];
        if (r == null) {
            this.error = RandomTestErrors.InsufficientMemory;
            this.random = false;
            return this.random;
        }
        sum = 0.0;
        for (i = 0; i < bitStream.GetBitLength(); i++)
            sum += bitStream.GetBitForward();
        this.pi = sum / bitStream.GetBitLength();
        for (i = 0; i < bitStream.GetBitLength() - 1; i++) {
            if (bitStream.GetBitPosition(i) == bitStream.GetBitPosition(i + 1))
                r[i] = 0;
            else
                r[i] = 1;
        }
        this.totalNumberRuns = 0;
        for (i = 0; i < bitStream.GetBitLength() - 1; i++)
            this.totalNumberRuns += r[i];
        this.totalNumberRuns++;
        product = this.pi * (1.e0 - this.pi);
        this.argument =
                Math.abs(this.totalNumberRuns - 2.e0 * bitStream.GetBitLength() * product) / (2.e0 * Math.sqrt(2.e0 *
                                                                                                               bitStream.GetBitLength()) *
                                                                                              product);
        this.pValue = this.mathFuncs.ErFc(this.argument);
        if (this.pValue < this.alpha) {
            this.random = false;
        } else {
            this.random = true;
        }
        r = null;
        if (this.mathFuncs.isNegative(this.pValue) || this.mathFuncs.isGreaterThanOne(this.pValue)) {
            this.random = false;
            this.error = RandomTestErrors.PValueOutOfRange;
        }
        return this.random;
    }
 
    /**
     * Initializes the object
     *
     */
    public void Initialize() {
 
        super.Initialize();
        this.pi = 0.0;
        this.totalNumberRuns = 0.0;
        this.argument = 0.0;
    }
 
    /**
     * Gets the type of the object
     *
     * @return    RandomTests:     the concrete type class of the random number test, Runs test for this class
     */
    public RandomTests GetType() {
 
        return RunsTest.TEST;
    }
 
    /**
     * Gets the minimum random stream length
     *
     * @return    int:    minimum length in bits of streams that can be checked by this test
     */
    public int GetMinimumLength() {
 
        return RunsTest.MINIMUMLENGTH;
    }
 
    /**
     * Gets the "pi" result
     *
     * @return    double:   ˇ"pi" result
     */
    public double GetPi() {
 
        return this.pi;
    }
 
    /**
     * Gets the total number of runs result
     *
     * @return    double:   ˇgets total number of runs
     */
    public double GetTotalNumberRuns() {
 
        return this.totalNumberRuns;
    }
 
    /**
     * Gets the argument result
     *
     * @return    double:   ˇgets argument parameter of error function in double precision
     */
    public double GetArgument() {
 
        return this.argument;
    }
 
}