SimpleRemoter/common/obfs.h

#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>
#include <stdint.h>
#include <stddef.h>
#pragma once

class ObfsBase
{
public:
    bool m_bGenCArray;
    ObfsBase(bool genCArray = true) : m_bGenCArray(genCArray) { }
    virtual ~ObfsBase() { }

    // <20>Գƻ<D4B3><C6BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڼ<EFBFBD><DABC>ܺͽ<DCBA><CDBD><EFBFBD>
    virtual void ObfuscateBuffer(uint8_t* buf, size_t len, uint32_t seed) {}

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><CBB3><EFBFBD>෴
    virtual void DeobfuscateBuffer(uint8_t* buf, size_t len, uint32_t seed) {}

    virtual bool WriteFile(const char* filename, uint8_t* data, size_t length, const char* arrayName)
    {
        return m_bGenCArray ? WriteBinaryAsCArray(filename, data, length, arrayName) : WriteBinaryFile(filename, data, length);
    }

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> C <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽд<CABD><D0B4><EFBFBD>ļ<EFBFBD>
    virtual bool WriteBinaryAsCArray(const char* filename, uint8_t* data, size_t length, const char* arrayName)
    {
        FILE* file = fopen(filename, "w");
        if (!file) return false;

        fprintf(file, "unsigned char %s[] = {\n", arrayName);
        for (size_t i = 0; i < length; ++i) {
            if (i % 24 == 0) fprintf(file, "    ");
            fprintf(file, "0x%02X", data[i]);
            if (i != length - 1) fprintf(file, ",");
            if ((i + 1) % 24 == 0 || i == length - 1) fprintf(file, "\n");
            else fprintf(file, " ");
        }
        fprintf(file, "};\n");
        fprintf(file, "unsigned int %s_len = %zu;\n", arrayName, length);

        fclose(file);
        return true;
    }

    // ʹ<><CAB9> "wb" <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><D0B4>ģʽ
    virtual bool WriteBinaryFile(const char* filename, const uint8_t* data, size_t length)
    {
        FILE* file = fopen(filename, "wb");
        if (!file) return false;

        size_t written = fwrite(data, 1, length, file);
        fclose(file);

        return written == length;
    }
};

class Obfs : public ObfsBase
{
private:
    // <20><><EFBFBD><EFBFBD>8λ<38><CEBB><EFBFBD><EFBFBD>
    static inline uint8_t rol8(uint8_t val, int shift)
    {
        return (val << shift) | (val >> (8 - shift));
    }

    // <20><><EFBFBD><EFBFBD>8λ<38><CEBB><EFBFBD><EFBFBD>
    static inline uint8_t ror8(uint8_t val, int shift)
    {
        return (val >> shift) | (val << (8 - shift));
    }

public:
    Obfs(bool genCArray = true) : ObfsBase(genCArray) { }

    // <20>Գƻ<D4B3><C6BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڼ<EFBFBD><DABC>ܺͽ<DCBA><CDBD><EFBFBD>
    virtual void ObfuscateBuffer(uint8_t* buf, size_t len, uint32_t seed)
    {
        uint32_t state = seed;

        for (size_t i = 0; i < len; ++i) {
            uint8_t mask = (uint8_t)((state >> 16) & 0xFF);
            buf[i] = rol8(buf[i] ^ mask, 3);  // <20><><EFBFBD><EFBFBD>+<2B><>ת<EFBFBD><D7AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
            state = state * 2654435761u + buf[i]; // LCG + <20><><EFBFBD><EFBFBD><EFBFBD>Ŷ<EFBFBD>
        }
    }

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><CBB3><EFBFBD>෴
    virtual void DeobfuscateBuffer(uint8_t* buf, size_t len, uint32_t seed)
    {
        uint32_t state = seed;

        for (size_t i = 0; i < len; ++i) {
            uint8_t mask = (uint8_t)((state >> 16) & 0xFF);
            uint8_t orig = buf[i];
            buf[i] = ror8(buf[i], 3) ^ mask;
            state = state * 2654435761u + orig; // <20><><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><C3BB><EFBFBD>ǰ<EFBFBD><C7B0>ԭ<EFBFBD>ֽڸ<D6BD><DAB8><EFBFBD> state
        }
    }
};