「NCTF2021」Rev 部分题解 by 0xbl4cb12d

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#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>

char table[] = "#$%&'()*+,-.s0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[h]^_`ab";
char padding_char = '!';

int findchr(char *array, char ch) {
        for(int i = 0; i < strlen(array); i++) {
                if(array[i] == ch) {
                        return i;
                }
        }
        return 0;
}

void b64encode(char *src, char *result) {
        int fill_byte = 0, result_length = 0, index = 0, data_length = strlen(src);
        // bool full = true;
        fill_byte = (3-data_length)%3;
        for(int k = 0; k < fill_byte; k++) {
                src[data_length + k] = '\0';
        }
        int j = 0;
        for(int i = 0; i < data_length; i += 3) {
                index = src[i] >> 2;
                result[j++] = table[index];
                index = ((src[i] & 3) << 4) + (src[i+1] >> 4);
                result[j++] =  table[index];
                index = ((src[i+1]&15) << 2) + (src[i+2] >> 6);
                result[j++] = table[index];
                index = (src[i+2]&0x3f);
                result[j++] = table[index];
        }
        result_length = strlen(result);
        for(int k = 0; k < fill_byte; k++) {
                result[result_length - 1 - k] = padding_char;
        }
}

void b64decode(char *src, char *result) {
        int base_len = strlen(src);
        int j = 0;

        for(int i = 0; i < base_len; i++) {
                if (src[i] == padding_char)
                        src[i] = 'A';
        }
        for(int i = 0; i <base_len; i += 4) {
                result[j++] = (findchr(table, src[i]) << 2) + (findchr(table, src[i+1]) >> 4);
                result[j++] = (findchr(table, src[i+1]) << 4) + (findchr(table, src[i+2]) >> 2);
                result[j++] = ((findchr(table, src[i + 2]) & 3) << 6) + (findchr(table, src[i+3]));
        }
}

int main() {
        char de_words[100] = {'\0'};
        char en_words[100] = "6G074JP+s)WV:Z+T<&(Q18`Ks)WV:Y4hs9[h:YCS?&0`!";
        b64decode(en_words, de_words);
        printf("encode:%s\n", en_words);
        printf("decode:%s\n", de_words);
        return 0;
}

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void __cdecl realJudge(const char *input)
{
  signed int v1; // [esp+0h] [ebp-98h]
  unsigned int strlen_input; // [esp+10h] [ebp-88h]
  signed int v3; // [esp+1Ch] [ebp-7Ch]
  int v4; // [esp+2Ch] [ebp-6Ch]
  int v5; // [esp+2Ch] [ebp-6Ch]
  char v6; // [esp+32h] [ebp-66h]
  signed int Size; // [esp+34h] [ebp-64h]
  unsigned int v8; // [esp+38h] [ebp-60h]
  int k; // [esp+38h] [ebp-60h]
  unsigned __int8 *v10; // [esp+3Ch] [ebp-5Ch]
  int i; // [esp+40h] [ebp-58h]
  signed int j; // [esp+40h] [ebp-58h]
  signed int l; // [esp+40h] [ebp-58h]
  signed int m; // [esp+40h] [ebp-58h]
  signed int n; // [esp+40h] [ebp-58h]
  char v16[62]; // [esp+44h] [ebp-54h]
  int v17; // [esp+82h] [ebp-16h]
  int v18; // [esp+86h] [ebp-12h]
  int v19; // [esp+8Ah] [ebp-Eh]
  int v20; // [esp+8Eh] [ebp-Ah]
  __int16 v21; // [esp+92h] [ebp-6h]

  strlen_input = strlen(input);                 // should be 42
  Size = 146 * strlen_input / 0x64 + 1;
  v3 = 0;
  v10 = (unsigned __int8 *)malloc(Size);
  v16[0] = 82;
  v16[1] = 195;
  v16[2] = 26;
  v16[3] = 224;
  v16[4] = 22;
  v16[5] = 93;
  v16[6] = 94;
  v16[7] = -30;
  v16[8] = 103;
  v16[9] = 31;
  v16[10] = 31;
  v16[11] = 6;
  v16[12] = 6;
  v16[13] = 31;
  v16[14] = 23;
  v16[15] = 6;
  v16[16] = 15;
  v16[17] = -7;
  v16[18] = 6;
  v16[19] = 103;
  v16[20] = 88;
  v16[21] = -78;
  v16[22] = -30;
  v16[23] = -116;
  v16[24] = 15;
  v16[25] = 42;
  v16[26] = 6;
  v16[27] = -119;
  v16[28] = -49;
  v16[29] = 42;
  v16[30] = 6;
  v16[31] = 31;
  v16[32] = -104;
  v16[33] = 26;
  v16[34] = 62;
  v16[35] = 23;
  v16[36] = 103;
  v16[37] = 31;
  v16[38] = -9;
  v16[39] = 58;
  v16[40] = 68;
  v16[41] = -61;
  v16[42] = 22;
  v16[43] = 51;
  v16[44] = 105;
  v16[45] = 26;
  v16[46] = 117;
  v16[47] = 22;
  v16[48] = 62;
  v16[49] = 23;
  v16[50] = -43;
  v16[51] = 105;
  v16[52] = 122;
  v16[53] = 27;
  v16[54] = 68;
  v16[55] = 68;
  v16[56] = 62;
  v16[57] = 103;
  v16[58] = -9;
  v16[59] = -119;
  v16[60] = 103;
  v16[61] = -61;
  v17 = 0;
  v18 = 0;
  v19 = 0;
  v20 = 0;
  v21 = 0;
  memset(v10, 0, Size);
  v8 = 0;
  for ( i = 0; i < 256; ++i )                   // swap
  {
    v6 = byte_405018[i];
    byte_405018[i] = byte_405018[(i + *((unsigned __int8 *)&dword_405168 + i % 4)) % 256];
    byte_405018[(i + *((unsigned __int8 *)&dword_405168 + i % 4)) % 256] = v6;
  }
  while ( v8 < strlen(input) )
  {
    v4 = input[v8];
    for ( j = 146 * strlen_input / 0x64; ; --j ) // a re-traversal
    {
      v5 = v4 + (v10[j] << 8);
      v10[j] = v5 % 47;
      v4 = v5 / 47;
      if ( j < v3 )
        v3 = j;
      if ( !v4 && j <= v3 )
        break;
    }
    ++v8;
  }
  for ( k = 0; !v10[k]; ++k )
    ;
  for ( l = 0; l < Size; ++l )
    v10[l] = byte_405118[v10[k++]];
  while ( l < Size )
    v10[l++] = 0;
  v1 = strlen((const char *)v10);
  for ( m = 0; m < v1; ++m )
    v10[m] ^= byte_405018[v10[m]];
  for ( n = 0; n < v1; ++n )
  {
    if ( v10[n] != (unsigned __int8)v16[n] )
    {
      printf("Wrong!\n");
      exit(0);
    }
  }
  printf("Right!\n");
}

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xor_table = [
    0x21, 0x43, 0x65, 0x87, 0x09, 0x21, 0x43, 0x65, 0xA2, 0x9B,
    0xF4, 0xDF, 0xAC, 0x7C, 0xA1, 0xC6, 0x16, 0xD0, 0x0F, 0xDD,
    0xDC, 0x73, 0xC5, 0x6B, 0xD1, 0x96, 0x47, 0xC2, 0x26, 0x67,
    0x4E, 0x41, 0x82, 0x20, 0x56, 0x9A, 0x6E, 0x33, 0x92, 0x88,
    0x29, 0xB5, 0xB4, 0x71, 0xA9, 0xCE, 0xC3, 0x34, 0x50, 0x59,
    0xBF, 0x2D, 0x57, 0x22, 0xA6, 0x30, 0x04, 0xB2, 0xCD, 0x36,
    0xD5, 0x68, 0x4D, 0x5B, 0x45, 0x9E, 0x85, 0xCF, 0x9D, 0xCC,
    0x61, 0x78, 0x32, 0x76, 0x31, 0xE3, 0x80, 0xAD, 0x39, 0x4F,
    0xFA, 0x72, 0x83, 0x4C, 0x86, 0x60, 0xB7, 0xD7, 0x63, 0x0C,
    0x44, 0x35, 0xB3, 0x7B, 0x19, 0xD4, 0x69, 0x08, 0x0B, 0x1F,
    0x3D, 0x11, 0x79, 0xD3, 0xEE, 0x93, 0x42, 0xDE, 0x23, 0x3B,
    0x5D, 0x8D, 0xA5, 0x77, 0x5F, 0x58, 0xDB, 0x97, 0xF6, 0x7A,
    0x18, 0x52, 0x15, 0x74, 0x25, 0x62, 0x2C, 0x05, 0xE8, 0x0D,
    0x98, 0x2A, 0x43, 0xE2, 0xEF, 0x48, 0x87, 0x49, 0x1C, 0xCA,
    0x2B, 0xA7, 0x8A, 0x09, 0x81, 0xE7, 0x53, 0xAA, 0xFF, 0x6F,
    0x8E, 0x91, 0xF1, 0xF0, 0xA4, 0x46, 0x3A, 0x7D, 0x54, 0xEB,
    0x2F, 0xC1, 0xC0, 0x0E, 0xBD, 0xE1, 0x6C, 0x64, 0xBE, 0xE4,
    0x02, 0x3C, 0x5A, 0xA8, 0x9F, 0x37, 0xAF, 0xA0, 0x13, 0xED,
    0x1B, 0xEC, 0x8B, 0x3E, 0x7E, 0x27, 0x99, 0x75, 0xAB, 0xFE,
    0xD9, 0x3F, 0xF3, 0xEA, 0x70, 0xF7, 0x95, 0xBA, 0x1D, 0x40,
    0xB0, 0xF9, 0xE5, 0xF8, 0x06, 0xBC, 0xB6, 0x03, 0xC9, 0x10,
    0x9C, 0x2E, 0x89, 0x5C, 0x7F, 0xB1, 0x1A, 0xD6, 0x90, 0xAE,
    0xDA, 0xE6, 0x5E, 0xB9, 0x84, 0xE9, 0x55, 0xBB, 0xC7, 0x0A,
    0xE0, 0x66, 0xF2, 0xD8, 0xCB, 0x00, 0x12, 0xB8, 0x17, 0x94,
    0x6A, 0x4A, 0x01, 0x24, 0x14, 0x51, 0x07, 0x65, 0x21, 0xC8,
    0x38, 0xFD, 0x8F, 0xC4, 0xF5, 0xFC
]
change_table = [
    0xA7, 0x1C, 0x7E, 0xAF, 0xD9, 0xC2, 0xC0, 0xBE, 0x1F, 0x45,
    0x9A, 0x85, 0x26, 0xE3, 0x87, 0xC3, 0x21, 0xE0, 0x95, 0x10,
    0x71, 0x70, 0x02, 0x75, 0x35, 0xA5, 0x1D, 0x0D, 0x2F, 0xEE,
    0x25, 0x7B, 0xB5, 0x82, 0x66, 0x8D, 0xDB, 0x53, 0x3A, 0x29,
    0xD4, 0x43, 0x99, 0x97, 0x9D, 0xE8, 0x49, 0x00
]

magic = [
    0x52, 0xC3, 0x1A, 0xE0, 0x16, 0x5D, 0x5E, 0xE2, 0x67, 0x1F,
    0x1F, 0x06, 0x06, 0x1F, 0x17, 0x06, 0x0F, 0xF9, 0x06, 0x67,
    0x58, 0xB2, 0xE2, 0x8C, 0x0F, 0x2A, 0x06, 0x89, 0xCF, 0x2A,
    0x06, 0x1F, 0x98, 0x1A, 0x3E, 0x17, 0x67, 0x1F, 0xF7, 0x3A,
    0x44, 0xC3, 0x16, 0x33, 0x69, 0x1A, 0x75, 0x16, 0x3E, 0x17,
    0xD5, 0x69, 0x7A, 0x1B, 0x44, 0x44, 0x3E, 0x67, 0xF7, 0x89,
    0x67
]

for item in magic:
    for i in range(256):
        if xor_table[i] ^ i == item:
            if i in change_table:
                print(change_table.index(i), end=" ")
    print("")

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from Crypto.Util.number import *
index = [
    2, 0, 45, 44, 30, 40, 8, 23, 11, 37, 34, 43, 43, 37, 24, 19, 4, 29, 19, 22, 13, 5,        23, 41, 4, 35, 20, 9, 14, 35, 43, 37, 3, 33, 10, 24, 22, 37, 38, 1, 25, 0, 30, 6,      42, 45, 36, 30, 10, 24, 21, 42, 26, 28, 25, 25, 10, 7, 38, 9, 11
]

result = 0
index = index[::-1]
for i in range(len(index)):
    result += index[i] * pow(47, i)

print(long_to_bytes(result))

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#include <stdio.h>
#include <stdint.h>

int main() {
    int32_t num = 0xEDB88320;
    int32_t v5 = 0;
    uint32_t v6 = 0;
    int16_t v7 = 0;
    int32_t wtf_table[256] = {0};

    do {
        v6 = (uint8_t)v5;
        v7 = 0;
        do {
            if ((v6 & 1) != 0)
                v6 = num ^ (v6 >> 1);
            else
                v6 = v6 >> 1;
            v7++;
        }
        while (v7 < 8);
        wtf_table[v5] = v6;
        v5++;
    }
    while (v5 != 256);
    for (int i = 0; i < 256; i++) {
        printf("%#x, ", wtf_table[i]);
    }
    return 0;
}

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asm = [
    'mov     ds:dword_404E50, 0FFFFFFFFh',
    'mov     ecx, ds:dword_404E40',
    'mov     dl, [ecx+4049F8h]', # input[0]
    'mov     byte ptr ds:unk_404E4C, dl',
    'movzx   eax, ds:byte_404E4C',
    'xor     eax, ds:dword_404E50',
    'mov     ds:byte_404E4C, al', # get the low 8 bits of eax
    'movzx   ecx, ds:byte_404E4C',
    'and     ecx, 0FFh', # (input[0] ^ 0xffffffff) & 0xff & 0xff
    'mov     ds:byte_404E4C, cl',
    'mov     edx, ds:dword_404E50',
    'shr     edx, 8',
    'mov     ds:dword_404E50, edx',
    'movzx   eax, ds:byte_404E4C',
    'mov     ecx, ds:dword_404E50',
    'xor     ecx, ds:wft_table[eax*4]',
    'mov     ds:dword_404E50, ecx',
    'mov     edx, ds:dword_404E40',
    'mov     al, [edx+4049F9h]', # input[1]
    'mov     ds:byte_404E4C, al',
    'movzx   ecx, ds:byte_404E4C',
    'xor     ecx, ds:dword_404E50',
    'mov     ds:byte_404E4C, cl', # get the low 8 bits of ecx
    'mov     edx, ds:dword_404E50',
    'shr     edx, 8',
    'mov     ds:dword_404E50, edx',
    'movzx   eax, ds:byte_404E4C',
    'mov     ecx, ds:dword_404E50',
    'xor     ecx, ds:wft_table[eax*4]'
    'mov     ds:dword_404E50, ecx'
    'mov     edx, ds:dword_404E50'
    'xor     edx, 0FFFFFFFFh',
    'mov     ds:dword_404E50, edx'
]

patch_length = [
    0x0000020A, 0x00000226, 0x00000236, 0x00000216, 0x00000317, 0x00000206,             0x00000115, 0x00000317, 0x00000FF6, 0x00000216, 0x00000206, 0x00000FF3,             0x00000206, 0x00000317, 0x00000206, 0x00000347, 0x00000206, 0x00000226,             0x00000236, 0x00000115, 0x00000317, 0x00000206, 0x00000216, 0x00000206,             0x00000FF3, 0x00000206, 0x00000317, 0x00000206, 0x00000347, 0x00000206,             0x00000206, 0x00000FF3, 0x00000206]

wtf_table = [
         0, 0x77073096, 0xee0e612c, 0x990951ba, 0x76dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0xedb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x9b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x1db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x6b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0xf00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x86d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x3b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x4db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0xd6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0xa00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x26d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x5005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0xcb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0xbdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d]


magic = [0xC0F6605E, 0x00B16E0A, 0x3319A2D2, 0x57CAB7B7, 0x9A646D9C, 0xBDD82726, 0xD838FB91, 0x8DE10BB3, 0x176B0DAD, 0x685FDEEF,
         0x2C1FF7B1, 0x6C444296, 0xA15CFE90, 0x20CD8721, 0x62967CE8, 0x2C1641FD, 0x572D0F9A, 0xAE52DC2C, 0x50497DCF, 0xFF6ABF4A]

def gen_patch_length_table():
    result = []
    for i in patch_length:
        result.append(i&0xf)

    return result


def unsigned32(signed):
    return signed % 0x100000000

def enc_func(a, b):
    result = 0xFFFFFFFF
    temp = (result ^ a) & 0xff
    result =  unsigned32(result) >> 8
    result = result ^ wtf_table[temp]
    temp = (result ^ b) & 0xff
    result = unsigned32(result) >> 8
    result = result ^ wtf_table[temp]
    result ^= 0xFFFFFFFF
    return result

def patch(addr, patch_table_item): # just a model
    v2 = patch_table_item >> 8
    choice = patch_table_item >> 4
    if choice == 0:
        pass
    elif choice == 1:
        pass
    elif choice == 2:
        pass
    elif choice == 3:
        pass
    elif choice == 4:
        pass

if __name__ == '__main__':
    flag = []
    for cnt in range(len(magic)):
        for i in range(256):
            for j in range(256):
                if enc_func(i, j) == magic[cnt]:
                    flag.append(i)
                    flag.append(j)
                    break

    print(bytes(flag))