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Re-Added Szperak's Allatori String Decrypter

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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
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104
src/main/java/the/bytecode/club/bytecodeviewer/plugin/preinstalled/AllatoriStringDecrypter.java
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@ -103,10 +103,7 @@ public class AllatoriStringDecrypter extends Plugin
public void scanClassNode(ClassNode classNode) throws Exception public void scanClassNode(ClassNode classNode) throws Exception
{ {
for (MethodNode method : classNode.methods) for (MethodNode method : classNode.methods)
{
scanMethodNode(classNode, method); scanMethodNode(classNode, method);
}
} }
public int readUnsignedShort(byte[] b, final int index) public int readUnsignedShort(byte[] b, final int index)
@ -131,78 +128,69 @@ public class AllatoriStringDecrypter extends Plugin
{ {
if (i instanceof LdcInsnNode) if (i instanceof LdcInsnNode)
{ {
LdcInsnNode ldci = (LdcInsnNode) i; LdcInsnNode ldcI = (LdcInsnNode) i;
if (ldci.cst instanceof String) if (ldcI.cst instanceof String)
{ laststringldconstack = ldcI;
laststringldconstack = ldci;
}
continue; continue;
} }
else if (i instanceof MethodInsnNode) else if (i instanceof MethodInsnNode)
{ {
MethodInsnNode methodi = (MethodInsnNode) i; MethodInsnNode methodI = (MethodInsnNode) i;
// Decryption is always a static call - 0xb8 - invokestatic
if (laststringldconstack != null && methodi.getOpcode() == 0xb8) if (laststringldconstack != null && methodI.getOpcode() == 0xb8)
{ // Decryption is always a static call - 0xb8 - invokestatic {
String decrypterclassname = methodi.owner; String decrypterClassName = methodI.owner;
String decrypterMethodName = methodi.name; String decrypterMethodName = methodI.name;
if (decrypterclassname.contains("$")) // Decrypter is always a static method of other class's inner class
{ // Decrypter is always a static method of other class's inner class if (decrypterClassName.contains("$"))
byte[] decrypterFileContents = BytecodeViewer.getFileContents(decrypterclassname + ".class"); {
byte[] decrypterFileContents = BytecodeViewer.getFileContents(decrypterClassName + ".class");
// We have to create new node for editing // 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 // 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) + System.out.println("Loading " + decrypterClassName);
classNode.name +
methodNode.name +
getConstantPoolSize(classNode.name)
);
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); log("Succesfully invoked decrypter method: " + decrypted);
laststringldconstack.cst = decrypted;
Class<?> decrypterClassList = the.bytecode.club.bytecodeviewer.api.BytecodeViewer iList.remove(methodI);
.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);
}
} }
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 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)); //iList.set(methodi, new MethodInsnNode(0xb8, methodi.bsm.getOwner(), methodi.bsm.getName(), methodi.bsm.getDesc(), false));
} }
} }
laststringldconstack = null; laststringldconstack = null;
} }
} }
@ -246,10 +233,9 @@ public class AllatoriStringDecrypter extends Plugin
} }
} }
if (insn == null) if (insn == null)
{
return false; return false;
}
while (insn != null) while (insn != null)
{ {
@ -258,15 +244,16 @@ public class AllatoriStringDecrypter extends Plugin
MethodInsnNode methodi = ((MethodInsnNode) insn); MethodInsnNode methodi = ((MethodInsnNode) insn);
if ("hashCode".equals(methodi.name)) // to this instruction if ("hashCode".equals(methodi.name)) // to this instruction
{
break; break;
}
} }
removeInsn = insn; removeInsn = insn;
insn = insn.getNext(); insn = insn.getNext();
iList.remove(removeInsn); // and remove it 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 iList.set(insn, new LdcInsnNode(newHashCode)); // then replace it with pre-computed key LDC
return true; return true;
} }
@ -311,7 +298,6 @@ public class AllatoriStringDecrypter extends Plugin
btnNewButton.setBounds(6, 56, 232, 23); btnNewButton.setBounds(6, 56, 232, 23);
getContentPane().add(btnNewButton); getContentPane().add(btnNewButton);
JLabel lblNewLabel = new JLabel("Class:"); JLabel lblNewLabel = new JLabel("Class:");
lblNewLabel.setBounds(6, 20, 67, 14); lblNewLabel.setBounds(6, 20, 67, 14);
getContentPane().add(lblNewLabel); getContentPane().add(lblNewLabel);