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我已經創建了這個程序，可以加密找到的文件，然後可以通過CryptDecrypt函數解密。該功能成功，但不是將文件解密爲純文本，而是使文件看起來更加加密。爲什麼我的解密函數更加擾亂密文，而不是解密密文？
我已經把CryptEncrypt函數和CryptDecrypt函數放在一起，這樣你可以更少地查看我做錯了什麼。還有一件事我使用Win32 API，沒有MFC或ATL。
if (LOWORD(wParam) == WORD(decrypt_id))
{
wchar_t filepath[256];
GetWindowTextW(hWnd, filepath, (int)256);
_wstat(filepath, &info4);
const long bytesize = info4.st_size;
unsigned char *buffer = new unsigned char[bytesize];
file = _wfopen(filepath, L"r");
size_t readsize = fread(buffer, sizeof(char), info4.st_size , file);
BOOL returnn = CryptAcquireContext(&hCryptProv, NULL, MS_ENHANCED_PROV, PROV_RSA_FULL, 0);
BOOL rvalue1 = CryptGenKey(hCryptProv, CALG_RC4, KEYLENGTH | CRYPT_EXPORTABLE, &hkey);
DWORD val = GetLastError();
DWORD datalength = info4.st_size;
BOOL rvalue3 = CryptDecrypt(hkey, NULL, FALSE, NULL, buffer, &datalength);
file2 = _wfopen(filepath, L"w");
size_t writesize = fwrite(buffer, sizeof(char), sizeof(buffer), file2);
free(buffer);
CryptReleaseContext(hCryptProv, 0);
CryptDestroyKey(hkey);
if (rvalue3 == 0)
{
DWORD result = GetLastError();
wchar_t dest[256] = L"Decryptor Failed To Decrypt File!";
wcscat_s(dest, L"\n");
wcscat_s(dest, L"Error Code: ");
wchar_t code[256];
swprintf_s(code, L"%d", result);
wcscat_s(dest, code);
wcscat_s(dest, L"\n");
wcscat_s(dest, L"Error Code Information at: http://msdn.microsoft.com/en-us/library/ms681381(v=VS.85).aspx");
MessageBoxW(hWnd, dest, L"Error", MB_ICONERROR | MB_OK);
ShowWindow(encrypt_button, SW_HIDE);
}
else
{
MessageBox(hWnd, L"Successfully Decrypted The File!", L"", MB_OK | MB_ICONINFORMATION);
ShowWindow(encrypt_button, SW_HIDE);
}
}
if (LOWORD(wParam) == WORD(encrypt_id))
{
wchar_t filepath[256];
GetWindowTextW(hWnd, filepath, (int)256);
_wstat(filepath, &info4);
const long bytesize = info4.st_size;
unsigned char *buffer = new unsigned char[bytesize];
file = _wfopen(filepath, L"r");
size_t readsize = fread(buffer, sizeof(char), info4.st_size , file);
BOOL returnn = CryptAcquireContext(&hCryptProv, NULL, MS_ENHANCED_PROV, PROV_RSA_FULL, 0);
BOOL rvalue1 = CryptGenKey(hCryptProv, CALG_RC4, KEYLENGTH | CRYPT_EXPORTABLE, &hkey);
DWORD val = GetLastError();
DWORD datalength = info4.st_size;
BOOL rvalue3 = CryptEncrypt(hkey, NULL, FALSE, NULL, buffer, &datalength, datalength);
file2 = _wfopen(filepath, L"w");
size_t writesize = fwrite(buffer, sizeof(char), sizeof(buffer), file2);
free(buffer);
CryptDestroyKey(hkey);
CryptReleaseContext(hCryptProv, 0);
if (rvalue3 == 0)
{
DWORD result = GetLastError();
wchar_t dest[256] = L"Encryptor Failed To Encrypt File!";
wcscat_s(dest, L"\n");
wcscat_s(dest, L"Error Code: ");
wchar_t code[256];
swprintf_s(code, L"%d", result);
wcscat_s(dest, code);
wcscat_s(dest, L"\n");
wcscat_s(dest, L"Error Code Information at: http://msdn.microsoft.com/en-us/library/ms681381(v=VS.85).aspx");
MessageBoxW(hWnd, dest, L"Error", MB_ICONERROR | MB_OK);
ShowWindow(encrypt_button, SW_HIDE);
}
else
{
MessageBox(hWnd, L"Successfully Encrypted The File!", L"", MB_OK | MB_ICONINFORMATION);
ShowWindow(encrypt_button, SW_HIDE);
}
}