Friday, 15 December 2017
SerialTest.java (Serial 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 Serial random number test
 *
 * @author      Angel Ferré @ DiceLock Security
 * @version     6.0.0.1
 * @since       2011-09-30
 */
public class SerialTest extends BaseRandomTest {
 
    /**
     * Random Test Class enumerator name
     */
    protected static final RandomTests TEST = RandomTests.Serial;
 
    /**
     * Random Test Class minimum stream length
     */
    protected static final int MINIMUMLENGTH = 128;
 
    /**
     * "blockLentgh" parameter, block length in bits for serial test
     */
    protected int blockLength;
 
    /**
     * "pvalue2" parameter, confidence level for randomness based on delta2 result
     */
    protected double pvalue2;
 
    /**
     * "psim" result
     */
    protected double psim;
 
    /**
     * "psim1" result
     */
    protected double psim1;
 
    /**
     * "psim2" result
     */
    protected double psim2;
 
    /**
     * "delta1" result, base to check "pValue" confidence level
     */
    protected double delta1;
 
    /**
     * "delta2" result, base to check "pvalue2" confidence level
     */
    protected double delta2;
 
    /**
     * Calculates Psi2 function of bitStream CryptoRandomStream based on m, blocklength, parameter
     *
     * @param   m           block length in bits
     * @param   bitStream   CryptoRandomStream to calculate Psi2 on
     * @return  double:     Psi2 calculation value
     */
    protected double psi2(int m, BaseCryptoRandomStream bitStream) {
        int i, j, k, powLen;
        double sum, numOfBlocks;
        int P[];
 
        if ((m == 0) || (m == -1))
            return 0.0;
        numOfBlocks = bitStream.GetBitLength();
        powLen = (int)Math.pow(2, m + 1) - 1;
        P = new int[powLen];
        if (P == null) {
            this.error = RandomTestErrors.InsufficientMemory;
            return 0.0;
        }
        for (i = 1; i < powLen - 1; i++)
            P[i] = 0;
        for (i = 0; i < numOfBlocks; i++) {
            k = 1;
            for (j = 0; j < m; j++) {
                if (bitStream.GetBitPosition((i + j) % bitStream.GetBitLength()) == 0)
                    k *= 2;
                else if (bitStream.GetBitPosition((i + j) % bitStream.GetBitLength()) == 1)
                    k = 2 * k + 1;
            }
            P[k - 1]++;
        }
        sum = 0.0;
        for (i = (int)Math.pow(2, m) - 1; i < (int)Math.pow(2, m + 1) - 1; i++)
            sum += Math.pow(P[i], 2);
        sum = (sum * Math.pow(2, m) / (double)bitStream.GetBitLength()) - (double)bitStream.GetBitLength();
        P = null;
        return sum;
    }
 
    /**
     * Constructor, default
     */
    public SerialTest() {
 
        super();
 
        this.blockLength = 16;
        this.pvalue2 = 0.0;
        this.psim = 0.0;
        this.psim1 = 0.0;
        this.psim2 = 0.0;
        this.delta1 = 0.0;
        this.delta2 = 0.0;
    }
 
    /**
     * Constructor with a MathematicalFunctions object instantiated
     *
     * @param     mathFuncObj   mathematicalFunctions object that will be used by this object
     */
    public SerialTest(MathematicalFunctions mathFuncObj) {
 
        super(mathFuncObj);
 
        this.blockLength = 16;
        this.pvalue2 = 0.0;
        this.psim = 0.0;
        this.psim1 = 0.0;
        this.psim2 = 0.0;
        this.delta1 = 0.0;
        this.delta2 = 0.0;
    }
 
    /**
     * Destructor, zeroes all data
     *
     */
    public void finalize() {
 
        this.blockLength = 0;
        this.pvalue2 = 0.0;
        this.psim = 0.0;
        this.psim1 = 0.0;
        this.psim2 = 0.0;
        this.delta1 = 0.0;
        this.delta2 = 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) {
 
        if (bitStream.GetBitLength() < (long)this.GetMinimumLength()) {
            this.error = RandomTestErrors.InsufficientNumberOfBits;
            this.random = false;
            return this.random;
        }
        this.error = RandomTestErrors.NoError;
        this.psim = psi2(this.blockLength, bitStream);
        this.psim1 = psi2(this.blockLength - 1, bitStream);
        this.psim2 = psi2(this.blockLength - 2, bitStream);
        this.delta1 = this.psim - this.psim1;
        this.delta2 = this.psim - 2.0 * this.psim1 + this.psim2;
        this.pValue = this.mathFuncs.IGammaC(Math.pow(2, this.blockLength - 1) / 2, this.delta1 / 2.0);
        if (Double.isNaN(this.pValue)) {
            this.pValue = 0;
            this.error = RandomTestErrors.MathematicianNAN;
            this.random = false;
            return this.random;
        }
        this.pvalue2 = this.mathFuncs.IGammaC(Math.pow(2, this.blockLength - 2) / 2, this.delta2 / 2.0);
        if (Double.isNaN(this.pvalue2)) {
            this.pvalue2 = 0;
            this.error = RandomTestErrors.MathematicianNAN;
            this.random = false;
            return this.random;
        }
        if (this.pValue < this.alpha) {
            this.random = false;
        } else {
            this.random = true;
        }
        if (this.pvalue2 < this.alpha) {
            this.random = false;
        }
        return this.random;
    }
 
    /**
     * Initializes the object
     *
     */
    public void Initialize() {
 
        super.Initialize();
        this.pvalue2 = 0.0;
        this.psim = 0.0;
        this.psim1 = 0.0;
        this.psim2 = 0.0;
        this.delta1 = 0.0;
        this.delta2 = 0.0;
    }
 
    /**
     * Gets the type of the object
     *
     * @return    RandomTests:     the concrete type class of the random number test, Serial test for this class
     */
    public RandomTests GetType() {
 
        return SerialTest.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 SerialTest.MINIMUMLENGTH;
    }
 
    /**
     * Sets "blockLength" parameter
     *
     * @param     block    sets the block length in bits that Serial test will use for checking randomness
     */
    public void SetBlockLength(int block) {
 
        this.blockLength = block;
    }
 
    /**
     * Gets "block length" parameter, block length in bits
     *
     * @return    int:    gets the block length that Serial test is using for checking randomness
     */
    public int GetBlockLength() {
 
        return this.blockLength;
    }
 
    /**
     * Gets pvalue2 parameter
     *
     * @return    double:   second pValue confidence level
     */
    public double GetPValue2() {
 
        return this.pvalue2;
    }
 
    /**
     * Gets "psim" result
     *
     * @return    double:   psim intermediate result
     */
    public double GetPsim() {
 
        return this.psim;
    }
 
    /**
     * Gets "psim1" result
     *
     * @return    double:   psim1 intermediate result to evaluate pValue
     */
    public double GetPsim1() {
 
        return this.psim1;
    }
 
    /**
     * Gets "psim2" result
     *
     * @return    double:   psim2 intermediate result to evaluate pvalue2
     */
    public double GetPsim2() {
 
        return this.psim2;
    }
 
    /**
     * Gets the "delta1" result
     *
     * @return    double:   delta1 intermediate result to evaluate pValue
     */
    public double GetDelta1() {
 
        return this.delta1;
    }
 
    /**
     * Gets the "delta2" result
     *
     * @return    double:   delta2 intermediate result to evaluate pvalue2
     */
    public double GetDelta2() {
 
        return this.delta2;
    }
 
    /**
     * Gets the "BlockSizeRecommended" for the indicated stream length
     *
     * @param     length    integer size of bit stream in bits
     * @return    int:      integer recomending the block size, length, parameter for the bit stream length
     */
    public int MaximumBlockSizeRecommended(int length) {
 
        return (int)this.mathFuncs.max(1, (Math.log(length) / Math.log(2) - 2));
    }
 
}