#pragma comment(lib, "Crypt32") #include #include using namespace std; BYTE* readFile(DWORD *, int argc, char* argv[]); HANDLE createaFile(int argc, char* argv[]); HANDLE createaFileforOutPut(int argc, char* argv[]); void failed(); void close_handle(HANDLE); BOOL WriteFile(HANDLE hFile, DATA_BLOB pData, LPDWORD lpNumberOfBytesWritten); int main(int argc, char* argv[]) { // dm me or comment here if you find any bugs // please use visual studio or codeblocks or ofcruse cmd but don't forget to put it in the right directory! DWORD cbData; BYTE* protectText = readFile(&cbData, argc, argv); BYTE* protect = protectText; DATA_BLOB pDatain; DATA_BLOB pDataout; LPCWSTR text = L"*****This data is protected you will need to decrypt it!*****"; pDatain.pbData = protect; pDatain.cbData = cbData; cout << "Before encrpytion" << "Data to be encrypted: " << pDatain.pbData << endl; if (string(argv[1]) == "Encrypt") { if (CryptProtectData( &pDatain, text, NULL, NULL, NULL, CRYPTPROTECT_LOCAL_MACHINE, &pDataout )) { cout << "Encrption completed! " << "Data encrypted: " << pDataout.pbData << endl; LPDWORD reciveBytes = 0; HANDLE getaFile = createaFile(argc, argv); WriteFile(getaFile, pDataout, reciveBytes); } else { failed(); } } // time to decrypt DATA_BLOB Datain; Datain.pbData = pDatain.pbData; Datain.cbData = pDatain.cbData; if (string(argv[1]) == "Decrypt") { DATA_BLOB pDataDycrypt; if (CryptUnprotectData( &Datain, NULL, NULL, NULL, NULL, 0, &pDataDycrypt )) { cout << "Decryption went well! this is the decryption " << pDataDycrypt.pbData << endl; cout << "Decryption went well! this is the decryption " << pDataDycrypt.cbData << endl; LPDWORD reciveNewBytes = 0; HANDLE getaFile = createaFileforOutPut(argc, argv); WriteFile(getaFile, pDataDycrypt, reciveNewBytes); } else { failed(); } } } BYTE* readFile(DWORD *cbData, int argc, char* argv[]) { HANDLE getFile = createaFile(argc,argv); DWORD reciveBytes = 0; //If it's byte or kilobyte the size of the buffer will be 1024. //If it's megabytes or gigabyte the size of the buffer will be 4096. const DWORD Buffersize = 1024; // gave me warning for 1024 BYTE* memory = new BYTE[Buffersize]; memset(memory, 0, Buffersize); if (ReadFile( getFile, memory, Buffersize, &reciveBytes, NULL )) { close_handle(getFile); } else { failed(); } *cbData = reciveBytes; return memory; } HANDLE createaFile(int argc, char* argv[]) { LPCSTR fileName = argv[2]; HANDLE getFile = CreateFileA( fileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, // check this maybe FILE_ATTRIBUTE_ENCRYPTED NULL ); if (!getFile) { failed(); } return getFile; } HANDLE createaFileforOutPut(int argc, char* argv[]) { LPCSTR fileName = argv[2]; DeleteFileA(fileName); HANDLE getFile = CreateFileA( fileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, // check this maybe FILE_ATTRIBUTE_ENCRYPTED NULL ); if (!getFile) { failed(); } return getFile; } void failed() { cout << GetLastError() << endl; cout << "Faild!" << endl; } void close_handle(HANDLE getFile) { cout << "Great!" << endl; CloseHandle(getFile); } BOOL WriteFile(HANDLE getaFile, DATA_BLOB pData, LPDWORD lpNumberOfBytesWritten) { if (WriteFile( getaFile, pData.pbData, pData.cbData, lpNumberOfBytesWritten, NULL )) { close_handle(getaFile); return true; } else { failed(); return false; } }

Encryption&amp;decryption text file winAPI

Encryption&decryption text file winAPI