SimpleRemoter/common/ip_enc.h

#pragma once

#include <vector>
#include <cstdint>
#include <string>

// Encode for IP and Port.
// provided by ChatGPT.
class StreamCipher
{
private:
    uint32_t state;

    // <20>򵥷<EFBFBD><F2B5A5B7><EFBFBD><EFBFBD><EFBFBD>α<EFBFBD><CEB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    uint8_t prngNext()
    {
        // <20><><EFBFBD>ӣ<EFBFBD>xorshift32<33><32><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
        state ^= (state << 13);
        state ^= (state >> 17);
        state ^= (state << 5);
        // <20>ٻ<EFBFBD><D9BB><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>򵥵ķ<F2B5A5B5><C4B7><EFBFBD><EFBFBD>Ա任
        uint8_t out = (state & 0xFF) ^ ((state >> 8) & 0xFF);
        return out;
    }

public:
    StreamCipher(uint32_t key) : state(key) {}

    // <20><><EFBFBD>ܽ<EFBFBD><DCBD>ܣ<EFBFBD><DCA3>Գƣ<D4B3><C6A3><EFBFBD><EFBFBD>Ȳ<EFBFBD><C8B2>䣩
    void process(uint8_t* data, size_t len)
    {
        for (size_t i = 0; i < len; ++i) {
            data[i] ^= prngNext();
        }
    }
};

class PrintableXORCipher
{
public:
    // <20>ԳƼӽ<C6BC><D3BD>ܣ<EFBFBD><DCA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD>ɴ<EFBFBD>ӡ<EFBFBD>ַ<EFBFBD>
    // ǰ<>᣺<EFBFBD><E1A3BA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>32~126<32><36>Χ<EFBFBD><CEA7><EFBFBD>ַ<EFBFBD>
    void process(char* data, size_t len)
    {
        for (size_t i = 0; i < len; ++i) {
            char c = data[i];
            // <20><>֤<EFBFBD><D6A4><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><D6B7>ǿɴ<C7BF>ӡ<EFBFBD><D3A1>Χ
            if (c < 32 || c > 126) {
                // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ǵ<EFBFBD>ӡ<EFBFBD>ַ<EFBFBD><D6B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><D2B2><EFBFBD><EFBFBD><EFBFBD>Զ<EFBFBD><D4B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
                continue;
            }
            // <20><><EFBFBD><EFBFBD>0x55<35><35>'U'<27><><EFBFBD><EFBFBD>ȷ<EFBFBD><C8B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>32~126֮<36><D6AE>
            char encrypted = c ^ 0x55;
            // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڷ<EFBFBD>Χ<EFBFBD><CEA7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ط<EFBFBD>Χ<EFBFBD>ڣ<EFBFBD><DAA3>򵥼Ӽ<F2B5A5BC>ѭ<EFBFBD><D1AD><EFBFBD><EFBFBD>
            if (encrypted < 32) encrypted += 95;
            if (encrypted > 126) encrypted -= 95;
            data[i] = encrypted;
        }
    }
};