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arrow Previous Versions arrow XDiceLock 7.0.0.1 arrow cumulativeSumReverseTest.cpp
cumulativeSumReverseTest.cpp (Cumulative Sum Reverse random number test C++ source code file) Print E-mail
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//
//  cumulativeSumReverseTest.cpp
//  XDiceLock
//
//  Created by DiceLock on 1/1/12.
//  Copyright (c) 2012 DiceLock Security, LLC. All rights reserved.
//
 
//
// Creator:    http://www.dicelocksecurity.com
// Version:    vers.7.0.0.1
//
// Copyright (c) 2008-2012 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.
// 
 
#include <math.h>
#include "cumulativeSumReverseTest.h"
 
 
namespace DiceLockSecurity {
  
    namespace RandomTest {
        
        // Random Test Class enumerator name
        const RandomTests CumulativeSumReverseTest::test = CumulativeSumReverse;
        // Random Test Class minimum stream length
        const unsigned int  CumulativeSumReverseTest::minimumLength = 100;
        
        // Constructor, default 
        CumulativeSumReverseTest::CumulativeSumReverseTest() {
            
            this->cuSum = 0;
        }
        
        
        // Constructor with a MathematicalFunctions object instantiated 
        CumulativeSumReverseTest::CumulativeSumReverseTest(MathematicalFunctions* mathFuncObj) {
            
            this->cuSum = 0;
        }
        
        // Destructor
        CumulativeSumReverseTest::~CumulativeSumReverseTest() {
            
            this->cuSum = 0;
        }
        
        // Gets the BaseRandomTest random state of the last executed BaseCryptoRandomStream
        bool CumulativeSumReverseTest::IsRandom(void) {
            
            return BaseRandomTest::IsRandom();
        }
        
        // Tests randomness of the BaseCryptoRandomStream and returns the random value
        bool CumulativeSumReverseTest::IsRandom(BaseCryptoRandomStream* bitStream) {
            int    i, k, start, finish;
            double z, sum, sum1, sum2;
            
            if (bitStream->GetBitLength() < this->GetMinimumLength()) {
                this->error = InsufficientNumberOfBits;
                this->random = false;
                return this->random;
            }
            bitStream->SetBitPosition(bitStream->GetBitLength() -1);
            this->error = NoError;
            sum = 0.0;
            this->cuSum = 1;
            for(i = (int)bitStream->GetBitLength() -1; i >= 0; i--) {
                sum += 2*(int)bitStream->GetBitReverse() - 1;
                this->cuSum = DICELOCKSECURITY_MAX(this->cuSum, fabs(sum));
            }
            z = this->cuSum;
            sum1 = 0.0;
            start = (int)(-(long)bitStream->GetBitLength()/(int)z+1)/4;
            finish = (int)(bitStream->GetBitLength()/(int)z-1)/4;
            for(k = start; k <= finish; k++)
                sum1 += (this->mathFuncs->Normal((4*k+1)*z/sqrt((double)bitStream->GetBitLength()))-this->mathFuncs->Normal((4*k-1)*z/sqrt((double)bitStream->GetBitLength())));
            sum2 = 0.0;
            start = (int)(-(long)bitStream->GetBitLength()/(int)z-3)/4;
            finish = (int)(bitStream->GetBitLength()/(int)z-1)/4;
            for(k = start; k <= finish; k++)
                sum2 += (this->mathFuncs->Normal((4*k+3)*z/sqrt((double)bitStream->GetBitLength()))-this->mathFuncs->Normal((4*k+1)*z/sqrt((double)bitStream->GetBitLength())));
            this->pValue = 1.0 - sum1 + sum2;
            if (isNegative(this->pValue) || isGreaterThanOne(this->pValue)) {
                this->error = PValueOutOfRange;
                this->random = false; 
            }
            else {
                if (this->pValue < this->alpha) { 
                    this->random = false; 
                }
                else {
                    this->random = true; 
                }
            }
            return this->random;
        }
        
        // Initializes the object
        void CumulativeSumReverseTest::Initialize(void) {
            
            BaseRandomTest::Initialize();
            this->cuSum = 0;
        }
        
        // Gets the type of the object
        RandomTests CumulativeSumReverseTest::GetType(void) {
            
            return this->test;
        }
        
        // Gets the minimum random stream length
        unsigned int CumulativeSumReverseTest::GetMinimumLength(void) {
            
            return this->minimumLength;
        }
        
        // Gets the maximum partial sum
        double CumulativeSumReverseTest::GetCuSum(void) {
            
            return this->cuSum;
        }
    }
}