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//
// Creator: http://www.dicelocksecurity.com
// Version: vers.5.0.0.1
//
// Copyright 2008-2011 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 "cumulativeSumForwardTest.h"
using namespace std;
namespace DiceLockSecurity {
namespace RandomTest {
// Random Test Class enumerator name
const RandomTests CumulativeSumForwardTest::test = CumulativeSumForward;
// Random Test Class minimum stream length
const unsigned int CumulativeSumForwardTest::minimumLength = 100;
// Constructor, default
CumulativeSumForwardTest::CumulativeSumForwardTest() {
this->cuSum = 0;
}
// Constructor with a MathematicalFunctions object instantiated
CumulativeSumForwardTest::CumulativeSumForwardTest(MathematicalFunctions* mathFuncObj) {
this->cuSum = 0;
}
// Destructor
CumulativeSumForwardTest::~CumulativeSumForwardTest() {
this->cuSum = 0;
}
// Gets the BaseRandomTest random state of the last executed BaseCryptoRandomStream
bool CumulativeSumForwardTest::IsRandom(void) {
return BaseRandomTest::IsRandom();
}
// Tests randomness of the BaseCryptoRandomStream and returns the random value
bool CumulativeSumForwardTest::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(0);
this->error = NoError;
sum = 0.0;
this->cuSum = 1;
for(i = 0; i < (long)bitStream->GetBitLength(); i++) {
sum += 2*(int)bitStream->GetBitForward() - 1;
this->cuSum = MAX(this->cuSum, fabs(sum));
}
z = this->cuSum;
sum1 = 0.0;
start = (-(long)bitStream->GetBitLength()/(int)z+1)/4;
finish = (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 = (-(long)bitStream->GetBitLength()/(int)z-3)/4;
finish = (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 CumulativeSumForwardTest::Initialize(void) {
BaseRandomTest::Initialize();
this->cuSum = 0;
}
// Gets the type of the object
RandomTests CumulativeSumForwardTest::GetType(void) {
return this->test;
}
// Gets the minimum random stream length
unsigned int CumulativeSumForwardTest::GetMinimumLength(void) {
return this->minimumLength;
}
// Gets the maximum partial sum
double CumulativeSumForwardTest::GetCuSum(void) {
return this->cuSum;
}
}
}
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