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frequencyTest.cpp (Frequency random number test C++ source code file) Print E-mail
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//
//  frequencyTest.cpp
//  XDiceLock
//
//  Created by DiceLock on 1/1/12.
//  Copyright (c) 2008-2012 DiceLock Security, LLC. All rights reserved.
//
 
//
// Creator:    http://www.dicelocksecurity.com
// Version:    vers.8.0.0.1
//
// 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 "frequencyTest.h"
 
 
namespace DiceLockSecurity {
  
    namespace RandomTest {
        
        // Random Test Class enumerator name
        const RandomTests FrequencyTest::test = Frequency;
        // Random Test Class minimum stream length
        const unsigned int  FrequencyTest::minimumLength = 100;
        
        // Constructor, default 
        FrequencyTest::FrequencyTest() {
            
            this->sum = 0;
            this->sumDiv_n = 0.0;
        }
        
        
        // Constructor with a MathematicalFunctions object instantiated 
        FrequencyTest::FrequencyTest(MathematicalFunctions* mathFuncObj) {
            
            this->sum = 0;
            this->sumDiv_n = 0.0;
        }
        
        // Destructor
        FrequencyTest::~FrequencyTest() {
            
            this->sum = 0;
            this->sumDiv_n = 0.0;
        }
        
        // Gets the BaseRandomTest random state of the last executed BaseCryptoRandomStream
        bool FrequencyTest::IsRandom(void) {
            
            return BaseRandomTest::IsRandom();
        }
        
        // Tests randomness of the BaseCryptoRandomStream and returns the random value
        bool FrequencyTest::IsRandom(BaseCryptoRandomStream* bitStream) {
            unsigned int i;
            double f, s_obs, sumDouble;
            double sqrt2 = 1.41421356237309504880;
            unsigned short int bitTemp;
            
            if (bitStream->GetBitLength() < this->GetMinimumLength()) {
                this->error = InsufficientNumberOfBits;
                this->random = false;
                return this->random;
            }
            bitStream->SetBitPosition(0);
            this->error = NoError;
            sumDouble = 0.0;
            for(i = 0; i < bitStream->GetBitLength(); i++) {
                bitTemp = (unsigned short int)bitStream->GetBitPosition(i);
                sumDouble += ((2 * bitTemp) - 1);
            }
            s_obs = fabs(sumDouble)/sqrt((double)bitStream->GetBitLength());
            f = s_obs/sqrt2;
            this->pValue = this->mathFuncs->ErFc(f);
            if (this->pValue < this->GetAlpha()) { 
                this->random = false;
            }
            else {
                this->random = true;
            }
            this->sum = (int)sumDouble;
            this->sumDiv_n = sumDouble/bitStream->GetBitLength();
            return this->random;
        }
        
        // Initializes the object
        void FrequencyTest::Initialize(void) {
            
            BaseRandomTest::Initialize();
            this->sum = 0;
            this->sumDiv_n = 0.0;
        }
        
        // Gets the type of the object
        RandomTests FrequencyTest::GetType(void) {
            
            return this->test;
        }
        
        // Gets the minimum random stream length
        unsigned int FrequencyTest::GetMinimumLength(void) {
            
            return this->minimumLength;
        }
        
        // Gets the "sum" result
        signed int FrequencyTest::GetSum(void) {
            
            return this->sum;
        }
        
        // Gets the "sumDiv_n" result
        double FrequencyTest::GetSumDiv_n(void) {
            
            return this->sumDiv_n;
        }
    }
}