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//
// Creator: http://www.dicelocksecurity.com
// Version: vers.5.0.0.1
//
// Copyright 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.
#include <stdlib.h>
#include "baseCryptoRandomStream.h"
#include "defaultCryptoRandomStream.h"
#include "decreaseKeyModifier.h"
namespace DiceLockSecurity {
namespace Cipher {
namespace DiceLock {
namespace KeyModifier {
// Key modifier type enumerator name
const KeyModifiers DecreaseKeyModifier::keyModifierType = DecreaseKeyModifierType;
// Constructor, default
DecreaseKeyModifier::DecreaseKeyModifier() {
this->initialKey = NULL;
this->autoInitialKey = false;
}
// Destructor
DecreaseKeyModifier::~DecreaseKeyModifier() {
if ( this->autoInitialKey ) {
delete this->initialKey;
this->initialKey = NULL;
this->autoInitialKey = false;
}
this->initialKey = NULL;
}
// Initializes the object
void DecreaseKeyModifier::Initialize(void) {
if ( this->autoInitialKey ) {
delete this->initialKey;
this->initialKey = NULL;
this->autoInitialKey = false;
}
}
// Sets the initial key
void DecreaseKeyModifier::SetKey(BaseCryptoRandomStream* key) {
if ( this->autoInitialKey == NULL ) {
this->initialKey = new DefaultCryptoRandomStream(key->GetBitLength());
this->autoInitialKey = true;
}
key->Copy(this->initialKey);
}
// Gets the symmetric key modified
void DecreaseKeyModifier::GetModifiedKey(BaseCryptoRandomStream* key) {
unsigned long int index64, num64, indexUC, numUC, keyLength;
bool finished;
keyLength = key->GetBitLength();
num64 = keyLength / LONG64BITS;
finished = false;
index64 = 0;
if ( num64 > 0 ) {
do {
if ( key->Get64Position(index64) == 0 ) {
key->Set64Position(index64, key->Get64Position(index64) - 1);
index64++;
}
else {
key->Set64Position(index64, key->Get64Position(index64) - 1);
finished = true;
}
} while ( (index64 < num64) && !(finished) );
}
if ( ! finished ) {
if ( keyLength % LONG64BITS ) {
numUC = ( keyLength - (num64 * LONG64BITS) ) / BYTEBITS;
indexUC = (num64 * LONG64BITS) / BYTEBITS;
do {
if ( key->GetUCPosition(indexUC) == 0 ) {
key->SetUCPosition(indexUC, key->GetUCPosition(indexUC) - 1);
indexUC++;
}
else {
key->SetUCPosition(indexUC, key->GetUCPosition(indexUC) - 1);
finished = true;
}
} while ( (indexUC < numUC) && !(finished) );
}
}
try {
if ( key->Equals(this->initialKey) ) {
throw "No more key modification available !";
}
}
catch (char* str) {
throw str;
}
}
// Sets the working buffer key to keep the original key
void DecreaseKeyModifier::SetWorkingKey(BaseCryptoRandomStream* bufferKey) {
this->initialKey = bufferKey;
this->autoInitialKey = false;
}
// Gets the working buffer key used to keep the original key
BaseCryptoRandomStream* DecreaseKeyModifier::GetWorkingKey(void) {
return this->initialKey;
}
// Removes the working buffer key used to keep the original key
void DecreaseKeyModifier::RemoveWorkingKey(void) {
if ( this->autoInitialKey ) {
delete this->initialKey;
this->autoInitialKey = false;
}
this->initialKey = NULL;
}
// Gets the key modifier type
KeyModifiers DecreaseKeyModifier::GetKeyModifierType(void) {
return this->keyModifierType;
}
}
}
}
}
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