Cynosphere
/
bcv-vf
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Re-Added Szperak's Allatori String Decrypter

This commit is contained in:
Konloch 2021-06-27 21:34:57 -07:00
parent 563bc6b79e
commit b7deff48da
1 changed files with 45 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

104
src/main/java/the/bytecode/club/bytecodeviewer/plugin/preinstalled/AllatoriStringDecrypter.java
View File

@ -103,10 +103,7 @@ public class AllatoriStringDecrypter extends Plugin
public void scanClassNode(ClassNode classNode) throws Exception
{
for (MethodNode method : classNode.methods)
{
scanMethodNode(classNode, method);
}
}
public int readUnsignedShort(byte[] b, final int index)
@ -131,78 +128,69 @@ public class AllatoriStringDecrypter extends Plugin
{
if (i instanceof LdcInsnNode)
{
LdcInsnNode ldci = (LdcInsnNode) i;
if (ldci.cst instanceof String)
{
laststringldconstack = ldci;
}
LdcInsnNode ldcI = (LdcInsnNode) i;
if (ldcI.cst instanceof String)
laststringldconstack = ldcI;
continue;
}
else if (i instanceof MethodInsnNode)
{
MethodInsnNode methodi = (MethodInsnNode) i;
MethodInsnNode methodI = (MethodInsnNode) i;
if (laststringldconstack != null && methodi.getOpcode() == 0xb8)
{ // Decryption is always a static call - 0xb8 - invokestatic
String decrypterclassname = methodi.owner;
String decrypterMethodName = methodi.name;
// Decryption is always a static call - 0xb8 - invokestatic
if (laststringldconstack != null && methodI.getOpcode() == 0xb8)
{
String decrypterClassName = methodI.owner;
String decrypterMethodName = methodI.name;
if (decrypterclassname.contains("$"))
{ // Decrypter is always a static method of other class's inner class
byte[] decrypterFileContents = BytecodeViewer.getFileContents(decrypterclassname + ".class");
// Decrypter is always a static method of other class's inner class
if (decrypterClassName.contains("$"))
{
byte[] decrypterFileContents = BytecodeViewer.getFileContents(decrypterClassName + ".class");
// We have to create new node for editing
// Also, one decrypter method could be used for multiple methods in code, what gives us only part of string decrypted
ClassNode decrypterclassnode = ASMUtil.getClassNode(decrypterFileContents);
ClassNode decrypterClassNode = ASMUtil.getClassNode(decrypterFileContents);
MethodNode decryptermethodnode = ASMUtil.getMethodByName(decrypterClassNode, decrypterMethodName);
if (decrypterclassnode != null)
if (decryptermethodnode != null)
{
MethodNode decryptermethodnode = ASMUtil.getMethodByName(decrypterclassnode, decrypterMethodName);
String keyString = (getConstantPoolSize(classNode.name) +
classNode.name +
methodNode.name +
getConstantPoolSize(classNode.name)
);
if (decryptermethodnode != null)
int newHashCode = keyString.hashCode();
scanDecrypter(decryptermethodnode, newHashCode);
try
{
String keyString = (getConstantPoolSize(classNode.name) +
classNode.name +
methodNode.name +
getConstantPoolSize(classNode.name)
);
System.out.println("Loading " + decrypterClassName);
int newHashCode = keyString.hashCode();
Class<?> decrypterClassList = the.bytecode.club.bytecodeviewer.api.BytecodeViewer
.loadClassIntoClassLoader(decrypterClassNode);
scanDecrypter(decryptermethodnode, newHashCode);
String decrypted = invokeDecrypter(decrypterClassList, decrypterMethodName, (String) laststringldconstack.cst);
try
if (decrypted != null)
{
System.out.println("Loading " + decrypterclassname);
Class<?> decrypterClassList = the.bytecode.club.bytecodeviewer.api.BytecodeViewer
.loadClassIntoClassLoader(decrypterclassnode);
String decrypted = invokeDecrypter(decrypterClassList, decrypterMethodName, (String) laststringldconstack.cst);
if (decrypted != null)
{
log("Succesfully invoked decrypter method: " + decrypted);
laststringldconstack.cst = decrypted;
iList.remove(methodi);
}
log("Succesfully invoked decrypter method: " + decrypted);
laststringldconstack.cst = decrypted;
iList.remove(methodI);
}
catch (IndexOutOfBoundsException | ClassNotFoundException | IOException e)
{
e.printStackTrace();
log("Could not load decrypter class: " + decrypterclassname);
}
}
else
catch (IndexOutOfBoundsException | ClassNotFoundException | IOException e)
{
log("Could not find decrypter method (" + decrypterMethodName + ") of class " + decrypterclassname);
e.printStackTrace();
log("Could not load decrypter class: " + decrypterClassName);
}
}
else
{
log("Could not find decrypter ClassNode of class " + decrypterclassname);
log("Could not find decrypter method (" + decrypterMethodName + ") of class " + decrypterClassName);
}
}
}
@ -220,9 +208,8 @@ public class AllatoriStringDecrypter extends Plugin
//iList.set(methodi, new MethodInsnNode(0xb8, methodi.bsm.getOwner(), methodi.bsm.getName(), methodi.bsm.getDesc(), false));
}
}
laststringldconstack = null;
}
}
@ -246,10 +233,9 @@ public class AllatoriStringDecrypter extends Plugin
}
}
if (insn == null)
{
return false;
}
while (insn != null)
{
@ -258,15 +244,16 @@ public class AllatoriStringDecrypter extends Plugin
MethodInsnNode methodi = ((MethodInsnNode) insn);
if ("hashCode".equals(methodi.name)) // to this instruction
{
break;
}
}
removeInsn = insn;
insn = insn.getNext();
iList.remove(removeInsn); // and remove it
}
if (insn == null) return false;
if (insn == null)
return false;
iList.set(insn, new LdcInsnNode(newHashCode)); // then replace it with pre-computed key LDC
return true;
}
@ -311,7 +298,6 @@ public class AllatoriStringDecrypter extends Plugin
btnNewButton.setBounds(6, 56, 232, 23);
getContentPane().add(btnNewButton);
JLabel lblNewLabel = new JLabel("Class:");
lblNewLabel.setBounds(6, 20, 67, 14);
getContentPane().add(lblNewLabel);