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//
// Creator:    http://www.dicelocksecurity.com
// Version:    vers.5.0.0.1
//
// Copyright © 2008-2010 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 <stdexcept>
#include <stdlib.h>
#include <math.h>
#include <float.h>
#include "blockFrequencyTest.h"
 
 
using namespace std;
 
 
namespace DiceLockSecurity {
  
  namespace RandomTest {
 
  // Random Test Class enumerator name
  const RandomTests BlockFrequencyTest::test = BlockFrequency;
  // Random Test Class minimum stream length
  const unsigned int  BlockFrequencyTest::minimumLength = 100;
 
  // Constructor, default 
  BlockFrequencyTest::BlockFrequencyTest() {
 
    this->blockLength = 128;
    this->alpha = 0.0;
    this->pValue = 0.0;
    this->random = false;
    this->error = NoError; 
  }
 
  // Constructor with a MathematicalFunctions object instantiated 
  BlockFrequencyTest::BlockFrequencyTest(MathematicalFunctions* mathFuncObj) {
 
    BaseRandomTest::Initialize();
    this->blockLength = 128;
    this->chiSquared = 0.0;
    this->blockNumber = 0;
    this->bitsDiscarded = 0;
  }
 
  // Destructor
  BlockFrequencyTest::~BlockFrequencyTest() {
 
    BaseRandomTest::Initialize();
    this->chiSquared = 0.0;
    this->blockNumber = 0;
    this->bitsDiscarded = 0;
  }
 
  // Gets the BaseRandomTest random state of the last executed BaseCryptoRandomStream
  bool BlockFrequencyTest::IsRandom(void) {
 
    return BaseRandomTest::IsRandom();
  }
 
  // Tests randomness of the BaseCryptoRandomStream and returns the random value
  bool BlockFrequencyTest::IsRandom(BaseCryptoRandomStream* bitStream) {
    int    i, j;
    double blockSum, arg1, arg2;
    double sum, pi, v;
 
    if (bitStream->GetBitLength() < this->GetMinimumLength()) {
      this->error = InsufficientNumberOfBits;
      this->random = false;
      return this->random;
    }
    bitStream->SetBitPosition(0);
    this->error = NoError;
    this->blockNumber = (int)floor((double)bitStream->GetBitLength()/(double)this->blockLength);   // Number of Stream blocks      
    sum = 0.0;
    for(i = 0; i < this->blockNumber; i++) {  // N=10000 for each substring block
      pi = 0.0;
      blockSum = 0.0;
      bitStream->SetBitPosition(i*this->blockLength);
      for(j = 0; j < this->blockLength; j++)   // m=100 compute the "i"th Pi Value */   
        blockSum += bitStream->GetBitForward();    
      pi = (double)blockSum/(double)this->blockLength;
      v = pi - 0.5;
      sum += v*v;
    }
    this->chiSquared = 4.0 * this->blockLength * sum;
    arg1 = (double) this->blockNumber/2.e0;
    arg2 = this->chiSquared/2.e0;  
    this->pValue = this->mathFuncs->IGammaC(arg1,arg2);
    if (_isnan(this->pValue)) {
      this->pValue = 0;
      this->error = MathematicianNAN;
      this->random = false;
    }
    else {
      if (this->pValue < this->alpha) {    
        this->random = false;
      }
      else {
        this->random = true;
      }
    }
    this->bitsDiscarded = bitStream->GetBitLength()%this->blockLength;
    return this->random;
  }
 
  // Initializes the object
  void BlockFrequencyTest::Initialize(void) {
 
    BaseRandomTest::Initialize();
  }
 
  // Gets the type of the object
  RandomTests BlockFrequencyTest::GetType(void) {
 
    return this->test;
  }
 
  // Gets the minimum random stream length
  unsigned int BlockFrequencyTest::GetMinimumLength(void) {
 
    return this->minimumLength;
  }
 
  // Sets the blockLength
  void BlockFrequencyTest::SetBlockLength(unsigned int block) {
 
    this->blockLength = block;
  }
 
  // Gets the blockLength
  unsigned int BlockFrequencyTest::GetBlockLength(void) {
 
    return this->blockLength;
  }
 
  // Gets chiSquared
  double BlockFrequencyTest::GetChiSquared(void) {
 
    return this->chiSquared;
  }
 
  // Gets blockNumber tested
  int  BlockFrequencyTest::GetBlockNumber(void) {
 
    return this->blockNumber;
  }
 
  // Gets the bitsDiscarded not tested
  int BlockFrequencyTest::GetBitsDiscarded(void) {
 
    return this->bitsDiscarded;
  }
  }
}