bool InternetHandler::InternetFiletoMemoryBuffer (char *szUrl, MemoryBuffer *memOut, unsigned int maxsize)
{
DWORD dwBytesread = 0;
MemoryBuffer memTemp;
HINTERNET myInternet = InternetOpen ("CedeCrypt", INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, NULL);
if (myInternet != NULL) {
HINTERNET myUrl = InternetOpenUrl (myInternet, szUrl, NULL, NULL, INTERNET_FLAG_RELOAD, NULL);
if (myUrl != NULL) {
memTemp.SetSize (maxsize);
if (InternetReadFile (myUrl, memTemp.GetBuffer (), maxsize, &dwBytesread) == false) {
InternetCloseHandle (myInternet);
memTemp.Clear ();
return false;
} else {
if (dwBytesread > 0) {
memOut->SetSize (dwBytesread);
memOut->Write (memTemp.GetBuffer (), 0, dwBytesread);
memTemp.Clear ();
InternetCloseHandle (myInternet);
return true;
} else {
InternetCloseHandle (myInternet);
memTemp.Clear ();
return false;
}
}
} else {
InternetCloseHandle (myInternet);
return false;
}
} else {
return false;
}
//return false;
}
void Encryption::GenHive ()
{
// This generates the first pass of the main key hive.
// This is only done once, because the initial hive comes from the seed
// after this, we then use expand hive to create the final key hive.
int s = 0;
char szMult[2];
char szPower[1];
char szProduct[SIZE_STRING];
unsigned long lMult = 0;
unsigned long lPower = 0;
unsigned long lProduct = 0;
MemoryBuffer memHive;
memHive.SetSize (m_memSeed.GetAppendPointer ()*SIZE_STRING);
for (s=0;s<m_memSeed.GetAppendPointer ()-3;s++) {
// Copy 3 bytes at the current position into the Multiplier buffer
ZeroMemory (szMult, 2);
ZeroMemory (szPower, 1);
strncpy (szMult, (char *) m_memSeed.GetBuffer ()+s, 2);
strncpy (szPower, (char *) m_memSeed.GetBuffer ()+s+2, 1);
lMult = atoi (szMult);
lPower = atoi (szPower);
ZeroMemory (szProduct, SIZE_STRING);
lProduct = Raise (lMult, lPower);
ultoa (lProduct, szProduct, 10);
//OutputInt ("lProduct: ", lProduct);
//OutputText ("szProduct: ", szProduct);
memHive.Append ((char *) szProduct, strlen (szProduct));
}
m_memHive.SetSize (memHive.GetAppendPointer ());
m_memHive.Append (memHive.GetBuffer (), memHive.GetAppendPointer ());
memHive.Clear ();
}
void Encryption::SeedChecksum ()
{
// This function computes the checksum of the input passphrase
// and then adds this checksum value to each byte value in the current seed string.
MemoryBuffer memNewseed;
char szChecksum [SIZE_STRING];
ZeroMemory (szChecksum, SIZE_STRING);
char szSeedpart [SIZE_STRING];
ZeroMemory (szSeedpart, SIZE_STRING);
char szNewseed [SIZE_STRING];
ZeroMemory (szNewseed, SIZE_STRING);
unsigned int iSeedpart;
itoa (m_seedChecksum, szChecksum, 10);
memNewseed.SetSize (strlen (szChecksum) * SIZE_STRING);
for (int s=0;s<m_memSeed.GetAppendPointer ()-strlen(szChecksum);s++) {
ZeroMemory (szSeedpart, SIZE_STRING);
strncpy (szSeedpart, (char *) m_memSeed.GetBuffer ()+s, strlen (szChecksum));
iSeedpart = atoi (szSeedpart);
iSeedpart+=m_seedChecksum;
ZeroMemory (szNewseed, SIZE_STRING);
itoa (iSeedpart, szNewseed, 10);
memNewseed.Append ((char *) szNewseed, strlen (szNewseed));
}
m_memSeed.Clear ();
m_memSeed.SetSize (memNewseed.GetAppendPointer ());
m_memSeed.Append (memNewseed.GetBuffer (), memNewseed.GetAppendPointer ());
memNewseed.Clear ();
//OutputSeed ();
}
unsigned long Encryption::ExpandHive (MemoryBuffer *phive)
{
MemoryBuffer tmpHive;
int s = 0;
char szMult[2];
char szPower[1];
char szProduct[SIZE_STRING];
unsigned long lMult = 0;
unsigned long lPower = 0;
unsigned long lProduct = 0;
tmpHive.SetSize (phive->GetAppendPointer ()*SIZE_STRING);
for (s=0;s<phive->GetAppendPointer ()-3;s++) {
// Copy 3 bytes at the current position into the Multiplier buffer
ZeroMemory (szMult, 2);
ZeroMemory (szPower, 1);
strncpy (szMult, (char *) phive->GetBuffer ()+s, 2);
strncpy (szPower, (char *) phive->GetBuffer ()+s+2, 1);
lMult = atoi (szMult);
lPower = atoi (szPower);
ZeroMemory (szProduct, SIZE_STRING);
lProduct = Raise (lMult, lPower);
ultoa (lProduct, szProduct, 10);
tmpHive.Append ((char *) szProduct, strlen (szProduct));
}
phive->Clear ();
phive->SetSize (tmpHive.GetAppendPointer ());
phive->Append (tmpHive.GetBuffer (), tmpHive.GetAppendPointer ());
tmpHive.Clear ();
return phive->GetAppendPointer ();
}
bool StandardEncryption::EncryptBuffer (MemoryBuffer *memSource, PCHAR szPassword, bool bEncrypt)
{
HCRYPTPROV hCryptProv;
HCRYPTHASH hHash;
HCRYPTKEY hKey;
DWORD dwBufferlen;
DWORD dwBufsize;
MemoryBuffer memOutput;
// Get the handle to the default provider.
if(CryptAcquireContext(&hCryptProv, NULL, NULL, PROVIDER , 0)) {
//printf("A cryptographic provider has been acquired. \n");
} else {
MyHandleError("Error during CryptAcquireContext!");
return false;
}
if(!szPassword ) {
return false;
} else {
// Create a hash object.
if(CryptCreateHash(hCryptProv, CALG_MD5, 0, 0, &hHash)) {
//printf("A hash object has been created. \n");
} else {
MyHandleError("Error during CryptCreateHash!");
return false;
}
//-------------------------------------------------------------------
// Hash the password.
if(CryptHashData(hHash, (BYTE *)szPassword, strlen(szPassword), 0)) {
//printf("The password has been added to the hash. \n");
} else {
MyHandleError("Error during CryptHashData.");
return false;
}
//-------------------------------------------------------------------
// Derive a session key from the hash object.
if(CryptDeriveKey(hCryptProv, m_Currentalg, hHash, m_dwKeylength, &hKey)) {
//printf("An encryption key is derived from the password hash. \n");
} else {
MyHandleError("Error during CryptDeriveKey!");
return false;
}
//-------------------------------------------------------------------
// Destroy hash object.
if(hHash) {
if(!(CryptDestroyHash(hHash))) {
MyHandleError("Error during CryptDestroyHash");
return false;
}
hHash = 0;
}
// Encrypt / Decrypt data.
if (bEncrypt == true) {
// First get the size of the buffer needed.
dwBufferlen = memSource->GetSize ();
dwBufsize = memSource->GetSize ();
CryptEncrypt (hKey, 0, TRUE, 0, NULL, &dwBufferlen, dwBufsize);
if (dwBufferlen > 0) {
dwBufsize = dwBufferlen;
memOutput.SetSize (dwBufferlen);
memOutput.Write (memSource->GetBuffer (), 0, memSource->GetSize ());
if (!CryptEncrypt (hKey, 0, FALSE, 0, (BYTE *) memOutput.GetBuffer (), &dwBufferlen, dwBufsize)) {
MyHandleError ("Error during Encrypt.");
return false;
} else {
memSource->Clear ();
memSource->SetSize (memOutput.GetSize ());
memSource->Write (memOutput.GetBuffer (), 0, memOutput.GetSize ());
memOutput.Clear ();
}
} else {
OutputText ("Unable to obtain encrypted buffer size.");
return false;
}
} else {
dwBufferlen = memSource->GetSize ();
memOutput.SetSize (dwBufferlen);
memOutput.Write (memSource->GetBuffer (), 0, memSource->GetSize ());
if (!CryptDecrypt (hKey, 0, FALSE, 0, (BYTE *) memOutput.GetBuffer (), &dwBufferlen)) {
MyHandleError ("Error during Decrypt.");
return false;
} else {
memSource->Clear ();
memSource->SetSize (dwBufferlen);
memSource->Write (memOutput.GetBuffer (), 0, dwBufferlen);
memOutput.Clear ();
}
}
//-------------------------------------------------------------------
// Destroy the session key.
if(hKey)
{
if(!(CryptDestroyKey(hKey))) {
MyHandleError("Error during CryptDestroyKey");
return false;
}
}
//-------------------------------------------------------------------
// Release the provider handle.
if(hCryptProv)
{
if(!(CryptReleaseContext(hCryptProv, 0))) {
MyHandleError("Error during CryptReleaseContext");
return false;
}
}
return true;
}
}
bool Encryption::DoCipher (HWND hWnd, MemoryBuffer *pinbuffer, MemoryBuffer *poutbuffer, bool bEncrypt)
{
// Single threaded encryption function. Operates in a seperate thread, but a single thread
// only. Unfortunately on a Core Duo, or HT processor, it will only max out one of the CPU
// windows.
MemoryBuffer tmpBuffer;
unsigned long rndHive = 0;
int algsize = 100;
unsigned long hivepointer = 0;
unsigned long inputoffset = 0;
unsigned long iprogress = 0;
unsigned long ipercentage = 0;
int algpointer = 0;
unsigned long i = 0;
int cTrans = 0; // Our transposition value
int cAlg = 0; // The algorithm we use alongside the transposition value
unsigned long cProduct = 0; // This value is the current result of the transposition multiplication
bool cShift = 0; // The transposition shift - up or down
BYTE cByte = 0; // The current byte we're working on.
if (m_bHivecreated == false) {
OutputText ("Encryption: ", "Key hive not created.");
return false;
} else {
tmpBuffer.SetSize ((pinbuffer->GetSize ()+sizeof (unsigned long))*2);
OutputInt ("DoCipher: ", pinbuffer->GetSize ()*2);
// Generate a random number between 0 and the size of the hive
// minus 100 (we use 100 single digits for determining the transposition
// shift mechanism and transposition multiplier
if (bEncrypt == true) {
rndHive = GetRand (m_memHive.GetAppendPointer ()-algsize);
tmpBuffer.Append (&rndHive, sizeof (unsigned long));
} else {
memcpy (&rndHive, pinbuffer->GetBuffer (), sizeof (unsigned long));
inputoffset+=sizeof (unsigned long);
}
for (i=0;i<pinbuffer->GetSize ()-inputoffset;i++) {
cTrans = GetHiveValue (hivepointer, 2);
cAlg = GetHiveValue (rndHive+algpointer, 1);
if (cAlg <= 5) {
cShift = true; // true means we transpose up
} else {
cShift = false; // false means we transpose down
}
// Now transpose the current byte given the current hive value
// algorithm value and shift direction.
cByte = pinbuffer->GetByte (i+inputoffset);
cProduct = cTrans * cAlg;
if (bEncrypt == true) {
if (cShift == true) {
cByte+=cProduct;
} else {
cByte-=cProduct;
}
} else {
if (cShift == true) {
cByte-=cProduct;
} else {
cByte+=cProduct;
}
}
tmpBuffer.Append (&cByte, sizeof (BYTE));
hivepointer+=2;
algpointer++;
if (hivepointer >= m_memHive.GetAppendPointer ()-2) {
hivepointer = 0;
}
if (algpointer >= algsize) {
algpointer = 0;
}
iprogress++;
if (iprogress > 10000) {
iprogress = 0;
ipercentage = (i * 10) / (pinbuffer->GetSize ()-inputoffset);
PostMessage (hWnd, CRYPT_MSG, CRYPT_PROGRESSSINGLE, (LPARAM) ipercentage*10);
}
}
poutbuffer->SetSize (tmpBuffer.GetAppendPointer ());
poutbuffer->Append (tmpBuffer.GetBuffer (), tmpBuffer.GetAppendPointer ());
tmpBuffer.Clear ();
PostMessage (hWnd, CRYPT_MSG, CRYPT_PROGRESSSINGLE, (LPARAM) -1);
return true;
}
}