sbox.hpp

/*
 * sbox - Delimiter-less string obfuscation 
 * Ported from: https://github.com/x86byte/Obfusk8
 */

#include <iostream>
#include <vector>
#include <string>
#include <array>
#include <cstring>

using namespace std;

#pragma region AES_CONSTEXPR
    namespace aes_constexpr
    {
        constexpr uint8_t sbox[256] = {
                0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
                0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
                0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
                0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
                0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
                0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
                0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
                0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
                0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
                0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
                0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
                0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
                0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
                0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
                0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
                0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
        };
    
        constexpr uint8_t rsbox[256] = {
            0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
            0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
            0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
            0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
            0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
            0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
            0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
            0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
            0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
            0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
            0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
            0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
            0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
            0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
            0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
            0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
        };
    
        constexpr uint8_t rcon[11] = { 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };
    
        constexpr void KeyExpansion(const uint8_t* key, uint8_t* w) {
            for (int i = 0; i < 4; i++) {
                w[4 * i] = key[4 * i]; w[4 * i + 1] = key[4 * i + 1]; w[4 * i + 2] = key[4 * i + 2]; w[4 * i + 3] = key[4 * i + 3];
            }
            for (int i = 4; i < 44; i++) {
                uint8_t temp[4] = { w[4 * (i - 1)], w[4 * (i - 1) + 1], w[4 * (i - 1) + 2], w[4 * (i - 1) + 3] };
                if (i % 4 == 0) {
                    uint8_t t = temp[0];
                    temp[0] = sbox[temp[1]] ^ rcon[i / 4]; temp[1] = sbox[temp[2]]; temp[2] = sbox[temp[3]]; temp[3] = sbox[t];
                }
                w[4 * i] = w[4 * (i - 4)] ^ temp[0]; w[4 * i + 1] = w[4 * (i - 4) + 1] ^ temp[1]; w[4 * i + 2] = w[4 * (i - 4) + 2] ^ temp[2]; w[4 * i + 3] = w[4 * (i - 4) + 3] ^ temp[3];
            }
        }
    
        constexpr void AddRoundKey(uint8_t* state, const uint8_t* roundKey) { for (int i = 0; i < 16; i++) state[i] ^= roundKey[i]; }
        constexpr void SubBytes(uint8_t* state) { for (int i = 0; i < 16; i++) state[i] = sbox[state[i]]; }
        constexpr void InvSubBytes(uint8_t* state) { for (int i = 0; i < 16; i++) state[i] = rsbox[state[i]]; }
    
        constexpr void ShiftRows(uint8_t* state) {
            uint8_t temp[16] = { 0 };
            for (int i = 0; i < 16; i++)
                temp[i] = state[i];
            state[1] = temp[5]; state[5] = temp[9];
            state[9] = temp[13]; state[13] = temp[1];
            state[2] = temp[10]; state[6] = temp[14];
            state[10] = temp[2]; state[14] = temp[6];
            state[3] = temp[15]; state[7] = temp[3];
            state[11] = temp[7]; state[15] = temp[11];
        }
    
    
        constexpr void InvShiftRows(uint8_t* state) {
            uint8_t temp[16] = { 0 };
            for (int i = 0; i < 16; i++)
                temp[i] = state[i];
            state[1] = temp[13]; state[5] = temp[1];
            state[9] = temp[5]; state[13] = temp[9];
            state[2] = temp[10]; state[6] = temp[14];
            state[10] = temp[2]; state[14] = temp[6];
            state[3] = temp[7]; state[7] = temp[11];
            state[11] = temp[15]; state[15] = temp[3];
        }
    
        constexpr uint8_t gmul(uint8_t a, uint8_t b) {
            uint8_t p = 0;
            for (int i = 0; i < 8; i++)
            {
                if (b & 1)
                    p ^= a;
                bool hi = a & 0x80; a <<= 1;
                if (hi)
                    a ^= 0x1B; b >>= 1;
            }
            return p;
        }
    
        constexpr void MixColumns(uint8_t* state) {
            uint8_t tmp[16] = {}; for (int i = 0; i < 16; i++) tmp[i] = state[i];
            for (int i = 0; i < 4; i++) {
                state[4*i]   = gmul(tmp[4*i], 2) ^ gmul(tmp[4*i+1], 3) ^ tmp[4*i+2] ^ tmp[4*i+3];
                state[4*i+1] = tmp[4*i] ^ gmul(tmp[4*i+1], 2) ^ gmul(tmp[4*i+2], 3) ^ tmp[4*i+3];
                state[4*i+2] = tmp[4*i] ^ tmp[4*i+1] ^ gmul(tmp[4*i+2], 2) ^ gmul(tmp[4*i+3], 3);
                state[4*i+3] = gmul(tmp[4*i], 3) ^ tmp[4*i+1] ^ tmp[4*i+2] ^ gmul(tmp[4*i+3], 2);
            }
        }
    
        constexpr void InvMixColumns(uint8_t* state) {
            uint8_t tmp[16] = {}; for (int i = 0; i < 16; i++) tmp[i] = state[i];
            for (int i = 0; i < 4; i++) {
                state[4*i]   = gmul(tmp[4*i], 0x0e) ^ gmul(tmp[4*i+1], 0x0b) ^ gmul(tmp[4*i+2], 0x0d) ^ gmul(tmp[4*i+3], 0x09);
                state[4*i+1] = gmul(tmp[4*i], 0x09) ^ gmul(tmp[4*i+1], 0x0e) ^ gmul(tmp[4*i+2], 0x0b) ^ gmul(tmp[4*i+3], 0x0d);
                state[4*i+2] = gmul(tmp[4*i], 0x0d) ^ gmul(tmp[4*i+1], 0x09) ^ gmul(tmp[4*i+2], 0x0e) ^ gmul(tmp[4*i+3], 0x0b);
                state[4*i+3] = gmul(tmp[4*i], 0x0b) ^ gmul(tmp[4*i+1], 0x0d) ^ gmul(tmp[4*i+2], 0x09) ^ gmul(tmp[4*i+3], 0x0e);
            }
        }
    
        constexpr void EncryptBlock(uint8_t* in, const uint8_t* key) {
            uint8_t w[176] = {}; KeyExpansion(key, w);
            AddRoundKey(in, w);
            for (int r = 1; r < 10; r++)
            {
              SubBytes(in); ShiftRows(in);
              MixColumns(in); AddRoundKey(in, w + r * 16);
            }
            SubBytes(in);
            ShiftRows(in);
            AddRoundKey(in, w + 160);
        }
    
        constexpr void DecryptBlock(uint8_t* in, const uint8_t* key) {
            uint8_t w[176] = {}; KeyExpansion(key, w);
            AddRoundKey(in, w + 160);
            for (int r = 9; r > 0; r--)
            {
                InvShiftRows(in); InvSubBytes(in);
                AddRoundKey(in, w + r * 16); InvMixColumns(in);
            }
            InvShiftRows(in);
            InvSubBytes(in);
            AddRoundKey(in, w);
        }
    }
#pragma endregion AES_CONSTEXPR

class sbox
{
    const uint8_t master_key[16] = {
        0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
        0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10
    };

    public:
        string encode(vector<string>& strs)
        {
            string enc = "";
            for (const string& s : strs) {
                uint32_t len = (uint32_t)s.length();
                enc.append((char*)&len, sizeof(uint32_t));
                size_t num_blocks = (len + 15) / 16;
                if (!len)
                    num_blocks = 1;
                for (size_t b = 0; b < num_blocks; ++b) {
                    uint8_t block[16] = { 0 };
                    for (size_t i = 0; i < 16; ++i) {
                        const size_t idx = b * 16 + i;
                        if (idx < len)
                            block[i] = (uint8_t)s[idx];
                    }
                    aes_constexpr::EncryptBlock(block, master_key);
                    enc.append((char*)block, 16);
                }
            }
            return enc;
        }
    
        vector<string> decode(const string s)
        {
            vector<string> re;
            size_t cursor = 0;
            const size_t sz = s.size();
            while (cursor < sz)
            {
                uint32_t len;
                if (cursor + 4 > sz) break;
                memcpy(&len, &s[cursor], 4);
                cursor += 4;
    
                size_t num_blocks = (len + 15) / 16;
                if (len == 0) num_blocks = 1;
    
                string current_str = "";
                for (size_t b = 0; b < num_blocks; ++b) {
                    if (cursor + 16 > sz) break;
                    uint8_t block[16];
                    memcpy(block, &s[cursor], 16);
                    cursor += 16;
    
                    aes_constexpr::DecryptBlock(block, master_key);
                    
                    for (size_t i = 0; i < 16; ++i)
                        if (current_str.size() < len)
                            current_str += (char)block[i];
                }
                re.push_back(current_str);
            }
            return re;
        }
};

////////////////////////////////////////////////
// for single string
template <size_t N>
struct sbox_string {
    uint8_t data[((N + 15) / 16) * 16] = {0};
    size_t len = N;

    constexpr sbox_string(const char (&str)[N]) {
        for(size_t i = 0; i < N; ++i)
            data[i] = (uint8_t)str[i];
        uint8_t key[16] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10};
        for (size_t b = 0; b < (N + 15) / 16; ++b)
            aes_constexpr::EncryptBlock(&data[b * 16], key);
    }
};

#define ObfStr(str) ([&]() -> string { \
    static constexpr sbox_string<sizeof(str)> _h(str); \
    uint8_t _t[sizeof(_h.data)]; \
    memcpy(_t, _h.data, sizeof(_t)); \
    uint8_t _k[16] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10}; \
    for(int _b = 0; _b < sizeof(_t)/16; _b++) \
        aes_constexpr::DecryptBlock(&_t[_b*16], _k); \
    return string((char*)_t, _h.len - 1); \
}())
////////////////////////////////////////////////

////////////////////////////////////////////////
// for array or list or whatever its called, of strings
template <size_t N>
struct sbox_strings {
    uint8_t data[((N + 15) / 16) * 16] = {0};
    size_t len = N;

    constexpr sbox_strings(const char (&str)[N]) {
        for(size_t i = 0; i < N; ++i)
            data[i] = (uint8_t)str[i];
        uint8_t key[16] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10};
        for(size_t b = 0; b < (N + 15) / 16; ++b)
            aes_constexpr::EncryptBlock(&data[b * 16], key);
    }
};

#define _OBF(str) ([&]() -> string { \
    static constexpr sbox_strings<(sizeof(str))> _h(str); \
    uint8_t _t[sizeof(_h.data)]; \
    memcpy(_t, _h.data, sizeof(_t)); \
    uint8_t _k[16] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10}; \
    for(int _b = 0; _b < sizeof(_t)/16; _b++) \
        aes_constexpr::DecryptBlock(&_t[_b*16], _k); \
    return string((char*)_t, _h.len - 1); \
}())
////////////////////////////////////////////////