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Encrypter.cpp
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164 lines (134 loc) · 4.68 KB
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#include "precompiled_headers.h"
#include "Encrypter.h"
int Encrypter::encrypt(unsigned const char *keyBuffer, const int keyLength, unsigned char *encKeyBuffer, const int encKeyBufferLength)
{
int retVal = 0;
DATA_BLOB pDataOut;
DATA_BLOB pDataIn;
pDataIn.cbData = keyLength;
pDataIn.pbData = static_cast<BYTE *>(const_cast<unsigned char *>(keyBuffer));
HMODULE crypt32 = LoadLibrary(_T("crypt32.dll"));
if (crypt32 != NULL)
{
typedef BOOL (__stdcall * CryptProtectDataFunc)(DATA_BLOB*, LPCTSTR, DATA_BLOB*, PVOID, CRYPTPROTECT_PROMPTSTRUCT*, DWORD, DATA_BLOB*);
CryptProtectDataFunc cryptProtectData;
cryptProtectData = (CryptProtectDataFunc)GetProcAddress(crypt32, "CryptProtectData");
if (NULL != cryptProtectData)
{
BOOL success = cryptProtectData(&pDataIn, NULL, NULL, NULL, NULL, NULL, &pDataOut);
if (success && (encKeyBufferLength >= static_cast<int>(pDataOut.cbData)))
{
memcpy(encKeyBuffer, pDataOut.pbData, pDataOut.cbData);
retVal = pDataOut.cbData;
}
LocalFree(pDataOut.pbData);
}
}
return retVal;
}
bool Encrypter::convertToHex(const unsigned char *source, int sourceLength, TCHAR *hex, int bufferLength)
{
if (bufferLength < ((sourceLength * 2) + 1))
{
return false;
}
for (int pos = 0; pos < sourceLength; pos++)
{
_stprintf_s((hex + (pos*2)), bufferLength - (pos * 2), _T("%02x"), source[pos]);
}
hex[sourceLength * 2] = '\0';
return true;
}
bool Encrypter::convertFromHex(const TCHAR *hex, int hexLength, unsigned char *result, int resultLength)
{
bool retVal = true;
for(int pos = 0, resultPos = 0; pos < hexLength && resultPos < resultLength; pos += 2)
{
result[resultPos] = ((hex[pos] & 0x0F) + ((hex[pos] & 0x40) ? 9 : 0)) << 4;
result[resultPos++] |= (hex[pos+1] & 0x0F) + ((hex[pos+1] & 0x40) ? 9 : 0);
}
return retVal;
}
int Encrypter::decrypt(const unsigned char *encKeyBuffer, const int encKeyLength, unsigned char *keyBuffer, const int keyLength)
{
int retVal = 0;
DATA_BLOB pDataOut;
DATA_BLOB pDataIn;
pDataIn.cbData = encKeyLength;
pDataIn.pbData = static_cast<BYTE *>(const_cast<unsigned char *>(encKeyBuffer));
HMODULE crypt32 = LoadLibrary(_T("crypt32.dll"));
if (crypt32 != NULL)
{
typedef BOOL (__stdcall * CryptUnprotectDataFunc)(DATA_BLOB*, LPCTSTR, DATA_BLOB*, PVOID, CRYPTPROTECT_PROMPTSTRUCT*, DWORD, DATA_BLOB*);
CryptUnprotectDataFunc cryptUnprotectData;
cryptUnprotectData = (CryptUnprotectDataFunc)GetProcAddress(crypt32, "CryptUnprotectData");
if (NULL != cryptUnprotectData)
{
BOOL success = cryptUnprotectData(&pDataIn, NULL, NULL, NULL, NULL, NULL, &pDataOut);
if (success && (keyLength >= static_cast<int>(pDataOut.cbData)))
{
memcpy(keyBuffer, pDataOut.pbData, pDataOut.cbData);
retVal = pDataOut.cbData;
}
LocalFree(pDataOut.pbData);
}
}
return retVal;
}
int Encrypter::decryptHex(const TCHAR *encrypted, unsigned char *decryptBuffer, const int bufferLength)
{
int encryptedLength = _tcslen(encrypted);
int encBufferSize = (encryptedLength / 2) + 3;
unsigned char *encryptedBuffer = new unsigned char[encBufferSize];
convertFromHex(encrypted, encryptedLength, encryptedBuffer, encBufferSize);
int result = decrypt(encryptedBuffer, encryptedLength / 2, decryptBuffer, bufferLength);
if (bufferLength > result)
{
decryptBuffer[result] = '\0';
}
else
{
decryptBuffer[bufferLength] = '\0';
}
delete[] encryptedBuffer;
return result;
}
int Encrypter::encryptToHex(unsigned char *inBuffer, const int inLength, TCHAR *encHex, const int encHexBufferLength)
{
int encBufferLength = (inLength * 2) + 255;
unsigned char *encBuffer = new unsigned char[encBufferLength];
int encLength = encrypt(inBuffer, inLength, encBuffer, encBufferLength);
convertToHex(encBuffer, encLength, encHex, encHexBufferLength);
delete[] encBuffer;
return encLength;
}
/*
bool getKey(unsigned char *buffer, int bufferSize)
{
TCHAR encKeyBufferHex[1000];
unsigned char encKeyBuffer[500];
unsigned char keyBuffer[16];
int len = ::GetPrivateProfileString(SETTINGS_GROUP, KEY_KEY, _T(""), encKeyBufferHex, 1000, iniFilePath);
if (len == 0)
{
generateKey(keyBuffer, 16);
int encryptedSize = encryptKey(keyBuffer, 16, encKeyBuffer, 500);
convertToHex(encKeyBuffer, encryptedSize, encKeyBufferHex, 1000);
::WritePrivateProfileString(SETTINGS_GROUP, KEY_KEY, encKeyBufferHex, iniFilePath);
}
else
{
convertFromHex(encKeyBufferHex, _tcslen(encKeyBufferHex), encKeyBuffer, 500);
decryptKey(encKeyBuffer, keyBuffer, 16);
}
if (bufferSize >= 16)
{
memcpy(buffer, keyBuffer, 16);
return true;
}
else
{
return false;
}
}
*/