reverse3

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  for ( i = 0; i < 100; ++i )
  {
    if ( (unsigned int)i >= 0x64 )
      j____report_rangecheckfailure();
    Destination[i] = 0;
  }
  sub_41132F("please enter the flag:", v7);
  sub_411375("%20s", (char)Str);
  v3 = j_strlen(Str);
  v4 = (const char *)sub_4110BE(Str, v3, v14);
  strncpy(Destination, v4, 0x28u);
  v11 = j_strlen(Destination);
  for ( j = 0; j < v11; ++j )
    Destination[j] += j;
  v5 = j_strlen(Destination);
  if ( !strncmp(Destination, Str2, v5) )
    sub_41132F("rigth flag!\n", v8);
  else
    sub_41132F("wrong flag!\n", v8);
  return 0;
}

e3nifIH9b_C@n@dH

Base64 的核心特性是：将 3 个字节的原始数据编码为 4 个字符

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if ( !a1 || !a2 )
  return 0;
v9 = a2 / 3;
if ( (int)(a2 / 3) % 3 )
  ++v9;
v10 = 4 * v9;
*a3 = v10;
v12 = malloc(v10 + 1);

image-20260310214139302

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b'{i_l0ve_you}'