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add options to guess the key is system.json not found 

XOR memes
This commit is contained in:
Bluzume 2021-08-10 22:55:52 +12:00
parent 49fc079279
commit ca87e8f3e9
3 changed files with 243 additions and 25 deletions
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.vs/RMDEC/v16/.suo Normal file
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251
RMDEC/MVProject.cs
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@ -72,8 +72,11 @@ namespace RMDEC
}
set
{
jsonData.hasEncryptedImages = value;
File.WriteAllText(systemJsonFile, jsonData.ToString(Formatting.None));
if(jsonData != null)
{
jsonData.hasEncryptedImages = value;
File.WriteAllText(systemJsonFile, jsonData.ToString(Formatting.None));
}
encryptedImages = value;
}
}
@ -86,8 +89,11 @@ namespace RMDEC
}
set
{
jsonData.hasEncryptedAudio = value;
File.WriteAllText(systemJsonFile, jsonData.ToString(Formatting.None));
if (jsonData != null)
{
jsonData.hasEncryptedAudio = value;
File.WriteAllText(systemJsonFile, jsonData.ToString(Formatting.None));
}
encryptedAudio = value;
}
}
@ -109,7 +115,7 @@ namespace RMDEC
}
List<byte> byteList = new List<byte>();
for (int i = 0; i < HexStr.Length; i += 2)
{
string curHex = HexStr.Substring(i, 2);
@ -123,7 +129,196 @@ namespace RMDEC
}
private static byte[] guessKey(string path) // Incase you think your smart
{
string[] mzPngs = Directory.GetFiles(path, "*._png", SearchOption.AllDirectories);
string[] mvPngs = Directory.GetFiles(path, "*.rpgmvp", SearchOption.AllDirectories);
string[] mzM4as = Directory.GetFiles(path, "*._m4a", SearchOption.AllDirectories);
string[] mvM4as = Directory.GetFiles(path, "*.rpgmvm", SearchOption.AllDirectories);
List<string> files = new List<string>();
files.AddRange(mzPngs);
files.AddRange(mvPngs);
files.AddRange(mzM4as);
files.AddRange(mvM4as);
if (files.Count <= 0)
return new byte[0x10];
Random rng = new Random();
int index = rng.Next(0, files.Count);
string file = files[index];
byte[] encryptedHeader = new byte[0x10];
FileStream fs = File.OpenRead(file);
fs.Seek(0x10, SeekOrigin.Begin);
fs.Read(encryptedHeader, 0x00, 0x10);
fs.Close();
string filetype = Path.GetExtension(file).ToLower();
byte[] pngHeader = new byte[0x10] { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, 0x00, 0x00, 0x00, 0x0D, 0x49, 0x48, 0x44, 0x52 };
byte[] m4aHeader = new byte[0x10] { 0x00, 0x00, 0x00, 0x20, 0x66, 0x74, 0x79, 0x70, 0x4D, 0x34, 0x41, 0x20, 0x00, 0x00, 0x00, 0x00 };
if (filetype == "._png" || filetype == ".rpgmvp") {
byte[] key = RMProject.Xor(encryptedHeader, pngHeader);
if(!tryKey(path, key))
{
throw new Exception("Cannot find key (ITS TOO STRONG!)");
}
else
{
return key;
}
}
else if (filetype == "._m4a" || filetype == ".rpgmvm")
{
byte[] key = RMProject.Xor(encryptedHeader, m4aHeader);
if (!tryKey(path, key))
{
throw new Exception("Cannot find key (ITS TOO STRONG!)");
}
else
{
return key;
}
}
// OGG Header is not 0x10 bytes unfortunately.
throw new Exception("Cannot find key (ITS TOO STRONG!)");
}
private static bool tryKey(string path, byte[] key) // Checks if the key really works
{
string[] mzPngs = Directory.GetFiles(path, "*._png", SearchOption.AllDirectories);
string[] mvPngs = Directory.GetFiles(path, "*.rpgmvp", SearchOption.AllDirectories);
string[] mzM4as = Directory.GetFiles(path, "*._m4a", SearchOption.AllDirectories);
string[] mvM4as = Directory.GetFiles(path, "*.rpgmvm", SearchOption.AllDirectories);
string[] mzOggs = Directory.GetFiles(path, "*._ogg", SearchOption.AllDirectories);
string[] mvOggs = Directory.GetFiles(path, "*.rpgmvo", SearchOption.AllDirectories);
List<string> files = new List<string>();
files.AddRange(mzPngs);
files.AddRange(mvPngs);
files.AddRange(mzM4as);
files.AddRange(mvM4as);
files.AddRange(mzOggs);
files.AddRange(mvOggs);
if (files.Count <= 0)
return false;
Random rng = new Random();
int index = rng.Next(0, files.Count);
string file = files[index];
byte[] encryptedHeader = new byte[0x10];
FileStream fs = File.OpenRead(file);
fs.Seek(0x10, SeekOrigin.Begin);
fs.Read(encryptedHeader, 0x00, 0x10);
fs.Close();
byte[] plaintextHeader = RMProject.Xor(encryptedHeader, key);
string filetype = Path.GetExtension(file).ToLower();
if (filetype == "._png" || filetype == ".rpgmvp")
if (Encoding.ASCII.GetString(plaintextHeader).Contains("PNG"))
return true;
else
return false;
else if (filetype == "._ogg" || filetype == ".rpgmvo")
if (Encoding.ASCII.GetString(plaintextHeader).StartsWith("OggS"))
return true;
else
return false;
else if (filetype == "._m4a" || filetype == ".rpgmvm")
if (Encoding.ASCII.GetString(plaintextHeader).Contains("ftypM4A"))
return true;
else
return false;
else // No encrypted files?
return false;
}
private static MVProject GuessProject(string folder)
{
MVProject mvp = new MVProject();
mvp.MZ = false;
mvp.encryptedImages = false;
mvp.encryptedAudio = false;
folder = Path.GetDirectoryName(Path.GetDirectoryName(folder));
string[] mzPngs = Directory.GetFiles(folder, "*._png", SearchOption.AllDirectories);
string[] mvPngs = Directory.GetFiles(folder, "*.rpgmvp", SearchOption.AllDirectories);
string[] mzM4as = Directory.GetFiles(folder, "*._m4a", SearchOption.AllDirectories);
string[] mvM4as = Directory.GetFiles(folder, "*.rpgmvm", SearchOption.AllDirectories);
string[] mzOggs = Directory.GetFiles(folder, "*._ogg", SearchOption.AllDirectories);
string[] mvOggs = Directory.GetFiles(folder, "*.rpgmvo", SearchOption.AllDirectories);
string[] mzArtifacts = Directory.GetFiles(folder, "rmmz_*", SearchOption.AllDirectories);
string[] mvArtifacts = Directory.GetFiles(folder, "rpg_*", SearchOption.AllDirectories);
// Look for PNG
if (mvPngs.Length > 0)
{
mvp.MZ = false;
mvp.encryptedImages = true;
}
else if (mzPngs.Length > 0)
{
mvp.MZ = true;
mvp.encryptedImages = true;
}
// Look for M4A
if(mvM4as.Length > 0)
{
mvp.MZ = false;
mvp.encryptedAudio = true;
}
else if (mzM4as.Length > 0)
{
mvp.MZ = true;
mvp.encryptedAudio = true;
}
// Look for OGG
if (mvOggs.Length > 0)
{
mvp.MZ = false;
mvp.encryptedAudio = true;
}
else if (mzOggs.Length > 0)
{
mvp.MZ = true;
mvp.encryptedAudio = true;
}
// Determine MV or MZ
if(mzArtifacts.Length > 0)
{
mvp.MZ = true;
mvp.filePath = Path.GetDirectoryName(Path.GetDirectoryName(mzArtifacts[0]));
}
else if(mvArtifacts.Length > 0)
{
mvp.MZ = false;
mvp.filePath = Path.GetDirectoryName(Path.GetDirectoryName(mvArtifacts[0]));
}
if(mvp.IsEncrypted)
{
byte[] key = guessKey(folder);
mvp.encryptionKey = key;
mvp.isKeySet = true;
}
mvp.systemJsonFile = null;
mvp.jsonData = null;
return mvp;
}
private void genEncryptionKey()
{
@ -139,13 +334,17 @@ namespace RMDEC
//Public functions
public static MVProject ParseSystemJson(string path)
{
if (File.Exists(path))
//Check if valid system.json
if (File.Exists(path) && Path.GetExtension(path).ToLower() == ".json")
{
MVProject mvp = new MVProject();
string jsonStr = File.ReadAllText(path, Encoding.UTF8);
dynamic systemJson = JObject.Parse(jsonStr);
//Check if valid system.json
MVProject mvp = new MVProject();
if (systemJson.gameTitle != null)
{
@ -153,7 +352,7 @@ namespace RMDEC
}
else
{
throw new InvalidDataException("Not a valid system.json!");
return GuessProject(path);
}
if (systemJson.hasEncryptedAudio != null)
@ -169,8 +368,18 @@ namespace RMDEC
if (systemJson.encryptionKey != null)
{
string encKey = systemJson.encryptionKey;
mvp.encryptionKey = hexStr2Bytes(encKey);
mvp.isKeySet = true;
byte[] key = hexStr2Bytes(encKey);
if(tryKey(Path.GetDirectoryName(Path.GetDirectoryName(path)), key))
{
mvp.encryptionKey = key;
mvp.isKeySet = true;
}
else
{
key = guessKey(Path.GetDirectoryName(Path.GetDirectoryName(path)));
mvp.encryptionKey = key;
mvp.isKeySet = true;
}
}
mvp.filePath = Path.GetDirectoryName(Path.GetDirectoryName(path));
@ -188,18 +397,21 @@ namespace RMDEC
mvp.systemJsonFile = path;
mvp.jsonData = systemJson;
return mvp;
return mvp;
}
else
{
throw new FileNotFoundException(path + " was not found!");
return GuessProject(path);
}
}
public void EncryptFile(Stream inStream, Stream outStream)
public void EncryptFile(Stream inStream, Stream outStream, byte[] key = null)
{
if (key == null)
key = EncryptionKey;
outStream.Seek(0x00, SeekOrigin.Begin);
outStream.SetLength(0x00);
@ -216,12 +428,15 @@ namespace RMDEC
byte[] plaintextHeader = new byte[0x10];
inStream.Read(plaintextHeader, 0x00, 0x10);
byte[] encryptedHeader = RMProject.Xor(plaintextHeader, EncryptionKey);
byte[] encryptedHeader = RMProject.Xor(plaintextHeader, key);
outStream.Write(encryptedHeader, 0x00, encryptedHeader.Length);
inStream.CopyTo(outStream);
}
public void DecryptFile(Stream inStream, Stream outStream)
public void DecryptFile(Stream inStream, Stream outStream, byte[] key=null)
{
if (key == null)
key = EncryptionKey;
inStream.Seek(0x00, SeekOrigin.Begin);
byte[] magic = new byte[0x05];
@ -237,7 +452,7 @@ namespace RMDEC
byte[] encryptedHeader = new byte[0x10];
inStream.Read(encryptedHeader, 0x00, 0x10);
byte[] plaintextHeader = RMProject.Xor(encryptedHeader, EncryptionKey);
byte[] plaintextHeader = RMProject.Xor(encryptedHeader, key);
outStream.Seek(0x00, SeekOrigin.Begin);
outStream.SetLength(0);

17
RMDEC/projectSelector.cs
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@ -23,12 +23,12 @@ namespace RMDEC
this.Cursor = Cursors.Arrow;
}
private void tryAddProject(string projectFile)
private bool tryAddProject(string projectFile)
{
string relativeName = projectFile.Remove(0,projectDir.Text.Length + 1);
string extension = Path.GetExtension(projectFile).ToLower();
if (extension == ".json")
if (extension == ".json" || extension == ".js" || extension == ".png")
{
try
{
@ -40,7 +40,7 @@ namespace RMDEC
projectList.Items.Add("[RMMZ] - " + proj.GameTitle + " - " + relativeName);
selectButton.Enabled = true;
}
catch (Exception) { }
catch (Exception) { return false; }
}
else if (extension == ".rgss3a")
{
@ -51,10 +51,10 @@ namespace RMDEC
projectList.Items.Add("[RMVXA] - " + proj.GameTitle + " - " + relativeName);
selectButton.Enabled = true;
}
catch (Exception) { }
catch (Exception) { return false; }
}
return true;
}
private void updateProjectList(string projectDir)
{
@ -72,13 +72,16 @@ namespace RMDEC
{
foreach (string fileEntry in fileList)
{
if (Path.GetFileName(fileEntry) == "System.json" || Path.GetExtension(fileEntry).ToLower() == ".rgss3a")
bool shouldBreak = false;
if (Path.GetFileName(fileEntry).ToLower() == "system.json" || Path.GetFileName(fileEntry).ToLower().StartsWith("rmmz_core") || Path.GetFileName(fileEntry).ToLower().StartsWith("rpg_core") || Path.GetFileName(fileEntry).ToLower().StartsWith("icon.png") || Path.GetExtension(fileEntry).ToLower() == ".rgss3a")
{
Invoke((Action)delegate
{
tryAddProject(fileEntry);
shouldBreak = tryAddProject(fileEntry);
});
}
if (shouldBreak)
break;
}
}
catch (Exception) { };