二进制明文字符串加密: 实现原理

printf("conventional...n");

char strArray[] = { 'c', 'o', 'n', 'v', 'e', 'n', 't',
    'i', 'o', 'n', 'a', 'l', '.', '.', '.', 'n', '' };
printf(strArray);

char strArray[] = { 'c' + 1, 'o' + 1, 'n' + 1, 'v' + 1, 'e' + 1, 'n' + 1, 't' + 1,
    'i' + 1, 'o' + 1, 'n' + 1, 'a' + 1, 'l' + 1, '.' + 1, '.' + 1, '.' + 1, 'n' + 1, '' + 1 };
for (unsigned int index = 0; index < sizeof(strArray); index++)
{
    strArray[index] -= 1;
}
printf(strArray);

#define Enc(str) EncryptString(str).decrypt()
printf(Enc("encrypt string?"));

template<size_t N>
class EncryptString
{
public:
    template<size_t... Index>
    constexpr EncryptString(const char* plainString, std::index_sequence<Index...>)
        : encBuffer{ (plainString[Index] + 1)... }
    {}

    __forceinline char* decrypt()
    {
        for (auto index = 0; index < N; index++)
        {
            encBuffer[index] -= 1;
        }
        return encBuffer;
    }
private:
    char encBuffer[N];
};

#define Enc(str) EncryptString<sizeof(str)>(str, std::make_index_sequence<sizeof(str)>{}).decrypt()

printf(Enc("conventional...n"));