反编libmono.so，怎么找解密dll的代码？

Question

_android_log_print(6, "nd_unity", "mono_image_open_from_data_with_name(%s)", src);
  memset(&v39, 0, 0x400u);
  strcpy((char *)&v39, src);
  memset(&v36, 0, 0x400u);
  if ( !strstr((const char *)&v39, "Assembly-CSharp.dll") )
  {
    _android_log_print(6, "nd_unity", "CalcuFile(%s) no dll", src);
    v14 = v35;
    goto LABEL_18;
  }
  v6 = strstr((const char *)&v39, "/obb/");
  v7 = (char)v6;
  if ( v6 )
  {
    v8 = (int)(v6 + 5);
    v9 = strchr(v6 + 5, 47);
    if ( !v9 )
      goto LABEL_36;
    v10 = 0;
    *v9 = 0;
  }
  else
  {
    v29 = strchr((const char *)&v39, 45);
    if ( !v29 )
      goto LABEL_36;
    *v29 = v7;
    v30 = strrchr((const char *)&v39, 47);
    if ( !v30 )
      goto LABEL_36;
    v8 = (int)(v30 + 1);
  }
  if ( !v8 )
  {
LABEL_36:
    _android_log_print(6, "nd_unity", "CalcuPack(%s) failed", src);
    v14 = v35;
    goto LABEL_18;
  }
  sprintf(&v36, (const char *)&unk_2136EC, v8, v10);
  _android_log_print(6, "nd_unity", "CalcuFile(%s) ok", &v36);
  v11 = fopen(&v36, "rb");
  v12 = v11;
  if ( v11 )
  {
    fseek(v11, 0, 2);
    v13 = ftell(v12);
    fseek(v12, 0, 0);
    ptr = malloc((size_t)&v38);
    memset(ptr, 0, (size_t)&v38);
    fread(ptr, 1u, v13, v12);
    fclose(v12);
    _android_log_print(6, "nd_unity", "CalcuFile(%s) fopen ok", &v36);
    memset(&v38, 0, 0x40u);
    mono_md5_get_digest(ptr, v13, &v38);
    v14 = ptr;
    v15 = &v37;
    do
    {
      v16 = (unsigned __int8)(v15++)[1];
      v45 = &v38;
      sprintf((char *)&v45, "%02x", v16);
      strcat((char *)&g_szDLL, (const char *)&v45);
    }
    while ( v15 != &v40 );
    v17 = v13 + 15;
    if ( v13 >= 0 )
      v17 = v13;
    v41 = -207342219;
    v42 = 1012320837;
    v43 = -1539472223;
    v44 = 900089969;
    if ( v17 >> 4 > 0 )
    {
      v18 = ptr;
      do
      {
        v19 = -957401312;
        v20 = *(_DWORD *)v18;
        v21 = *((_DWORD *)v18 + 1);
        do
        {
          v21 = v21 - (v19 ^ v20) - (16 * v20 ^ (v20 >> 5)) - *(&v41 + ((v19 >> 11) & 3));
          v19 += 1640531527;
          v20 = v20 - (v21 ^ v19) - (16 * v21 ^ (v21 >> 5)) - *(&v41 + (v19 & 3));
        }
        while ( v19 );
        *(_DWORD *)v18 = v20;
        *((_DWORD *)v18 + 1) = v21;
        v18 = (char *)v18 + 16;
      }
      while ( v18 != &v38 );
    }
    n = v13;
    v35 = ptr;
  }
  else
  {
    _android_log_print(6, "nd_unity", "CalcuFile(%s) fopen failed", &v36);
    DecFile(v35, n, &v35, &n);
    v14 = v35;
  }
LABEL_18:
  if ( !v14 || !n )
  {
    if ( v32 )
    {
      result = 0;
      *(_DWORD *)v32 = 3;
      return result;
    }
    return 0;
  }
  if ( !v33 )
  {
LABEL_23:
    v23 = g_malloc0(872);
    *(_DWORD *)(v23 + 8) = v14;
    v24 = v23;
    v25 = *(_BYTE *)(v23 + 16);
    *(_DWORD *)(v23 + 12) = n;
    *(_BYTE *)(v23 + 16) = v25 & 0xFD | 2 * (v33 & 1);
    if ( src )
      v26 = g_strdup(src);
    else
      v26 = g_strdup_printf("data-%p", v14);
    *(_DWORD *)(v24 + 20) = v26;
    v27 = g_malloc0(396);
    v28 = (unsigned __int8)(*(_BYTE *)(v24 + 16) & 0xF7) | 8 * (a5 & 1);
    *(_DWORD *)v24 = 1;
    *(_BYTE *)(v24 + 16) = v28;
    *(_DWORD *)(v24 + 44) = v27;
    if ( do_mono_image_load(v24, v32, 1, 1) )
      return register_image();
    return 0;
  }
  result = g_malloc();
  v14 = (void *)result;
  if ( result )
  {
    memcpy((void *)result, v35, n);
    goto LABEL_23;
  }
  if ( v32 )
    *(_DWORD *)v32 = 1;
  else
    result = 0;
  return result;
}

Answer 1

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• 这篇文章：创建动态链接库（dll） 也许有你想要的答案，你可以看看

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