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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 <float.h>
#include "runsTest.h"
using namespace std;
namespace DiceLockSecurity {
namespace RandomTest {
// Random Test Class enumerator name
const RandomTests RunsTest::test = Runs;
// Random Test Class minimum stream length
const unsigned int RunsTest::minimumLength = 100;
// Constructor, default
RunsTest::RunsTest() {
this->pi = 0.0;
this->totalNumberRuns = 0.0;
this->argument = 0.0;
}
// Constructor with a MathematicalFunctions object instantiated
RunsTest::RunsTest(MathematicalFunctions* mathFuncObj) {
this->pi = 0.0;
this->totalNumberRuns = 0.0;
this->argument = 0.0;
}
// Destructor
RunsTest::~RunsTest() {
this->pi = 0.0;
this->totalNumberRuns = 0.0;
this->argument = 0.0;
}
// Gets the BaseRandomTest random state of the last executed BaseCryptoRandomStream
bool RunsTest::IsRandom(void) {
return BaseRandomTest::IsRandom();
}
// Tests randomness of the BaseCryptoRandomStream and returns the random value
bool RunsTest::IsRandom(BaseCryptoRandomStream* bitStream) {
unsigned int i, *r;
double product, sum;
if (bitStream->GetBitLength() < this->GetMinimumLength()) {
this->error = InsufficientNumberOfBits;
this->random = false;
return this->random;
}
bitStream->SetBitPosition(0);
this->error = NoError;
if ((r = (unsigned int *) calloc(bitStream->GetBitLength(),sizeof(int))) == NULL) {
this->error = InsufficientMemory;
this->random = false;
}
else {
sum = 0.0;
for(i = 0; i < bitStream->GetBitLength(); i++)
sum += (int)bitStream->GetBitForward();
this->pi = sum/bitStream->GetBitLength();
for(i = 0; i < bitStream->GetBitLength()-1; i++) {
if ((int)bitStream->GetBitPosition(i) == (int)bitStream->GetBitPosition(i+1))
r[i] = 0;
else
r[i] = 1;
}
this->totalNumberRuns = 0;
for(i = 0; i < bitStream->GetBitLength()-1; i++)
this->totalNumberRuns += r[i];
this->totalNumberRuns++;
product = this->pi * (1.e0 - this->pi);
this->argument = fabs(this->totalNumberRuns - 2.e0*bitStream->GetBitLength()*product)/(2.e0*sqrt(2.e0*bitStream->GetBitLength())*product);
this->pValue = this->mathFuncs->ErFc(this->argument);
if (this->pValue < this->alpha) {
this->random = false;
}
else {
this->random = true;
}
free(r);
if (isNegative(this->pValue) || isGreaterThanOne(this->pValue)) {
this->random = false;
this->error = PValueOutOfRange;
}
}
return this->random;
}
// Initializes the object
void RunsTest::Initialize(void) {
BaseRandomTest::Initialize();
this->pi = 0.0;
this->totalNumberRuns = 0.0;
this->argument = 0.0;
}
// Gets the type of the object
RandomTests RunsTest::GetType(void) {
return this->test;
}
// Gets the minimum random stream length
unsigned int RunsTest::GetMinimumLength(void) {
return this->minimumLength;
}
// Gets the "pi" result
double RunsTest::GetPi(void) {
return this->pi;
}
// Gets the total number of runs result
double RunsTest::GetTotalNumberRuns(void) {
return this->totalNumberRuns;
}
// Gets the argument result
double RunsTest::GetArgument(void) {
return this->argument;
}
}
}
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