- 添加 Obfuz.Runtime

- 添加float和double混淆

Editor/Obfuz.Editor.asmdef

@@ -2,7 +2,8 @@
     "name": "Obfuz",
     "rootNamespace": "",
     "references": [
-        "GUID:7e4de3067c2ab5c43a03ac49273dfb68"
+        "GUID:7e4de3067c2ab5c43a03ac49273dfb68",
+        "GUID:370c0d0004ef2414cb803d3ffd331dce"
     ],
     "includePlatforms": [
         "Editor"

Editor/Virtualization/ConstValue.cs

@@ -1,4 +1,7 @@
-namespace Obfuz.Virtualization
+using System;
+using UnityEngine.Assertions;
+
+namespace Obfuz.Virtualization
 {
     public struct ConstValue
     {
@@ -7,6 +10,16 @@
 
         public ConstValue(DataNodeType type, object value)
         {
+            switch (type)
+            {
+                case DataNodeType.Int32: Assert.IsTrue(value is int); break;
+                case DataNodeType.Int64: Assert.IsTrue(value is long); break;
+                case DataNodeType.Float32: Assert.IsTrue(value is float); break;
+                case DataNodeType.Float64: Assert.IsTrue(value is double); break;
+                case DataNodeType.String: Assert.IsTrue(value is string); break;
+                case DataNodeType.Bytes: Assert.IsTrue(value is byte[]); break;
+                default: throw new NotSupportedException($"Unsupported type {type} for ConstValue");
+            }
             this.type = type;
             this.value = value;
         }

Editor/Virtualization/DefaultDataObfuscator.cs

@@ -47,16 +47,16 @@ namespace Obfuz.Virtualization
 
         public void ObfuscateFloat(MethodDef method, float value, List<Instruction> obfuscatedInstructions)
         {
-            //IDataNode node = _nodeCreator.CreateRandom(DataNodeType.Float32, value);
+            IDataNode node = _nodeCreator.CreateRandom(DataNodeType.Float32, value);
-            //CompileNode(node, method, obfuscatedInstructions);
+            CompileNode(node, method, obfuscatedInstructions);
-            obfuscatedInstructions.Add(Instruction.Create(OpCodes.Ldc_R4, value));
+            //obfuscatedInstructions.Add(Instruction.Create(OpCodes.Ldc_R4, value));
         }
 
         public void ObfuscateDouble(MethodDef method, double value, List<Instruction> obfuscatedInstructions)
         {
-            //IDataNode node = _nodeCreator.CreateRandom(DataNodeType.Float64, value);
+            IDataNode node = _nodeCreator.CreateRandom(DataNodeType.Float64, value);
-            //CompileNode(node, method, obfuscatedInstructions);
+            CompileNode(node, method, obfuscatedInstructions);
-            obfuscatedInstructions.Add(Instruction.Create(OpCodes.Ldc_R8, value));
+            //obfuscatedInstructions.Add(Instruction.Create(OpCodes.Ldc_R8, value));
         }
 
         public void ObfuscateBytes(MethodDef method, Array value, List<Instruction> obfuscatedInstructions)

Editor/Virtualization/Functions/FunctionBase.cs

@@ -11,7 +11,7 @@ namespace Obfuz.Virtualization
 
         public abstract void CreateArguments(DataNodeType type, object value, CreateExpressionOptions options, List<ConstValue> args);
 
-        public abstract void CompileSelf(CompileContext ctx, List<Instruction> output);
+        public abstract void CompileSelf(CompileContext ctx, List<IDataNode> inputs, List<Instruction> output);
 
         public virtual void Compile(CompileContext ctx, List<IDataNode> inputs, ConstValue result)
         {
@@ -19,7 +19,7 @@ namespace Obfuz.Virtualization
             {
                 input.Compile(ctx);
             }
-            CompileSelf(ctx, ctx.output);
+            CompileSelf(ctx, inputs, ctx.output);
         }
 
         public virtual IDataNode CreateExpr(DataNodeType type, object value, CreateExpressionOptions options)

Editor/Virtualization/Functions/IntAdd.cs

@@ -42,7 +42,7 @@ namespace Obfuz.Virtualization.Functions
             }
         }
 
-        public override void CompileSelf(CompileContext ctx, List<Instruction> output)
+        public override void CompileSelf(CompileContext ctx, List<IDataNode> inputs, List<Instruction> output)
         {
             output.Add(Instruction.Create(OpCodes.Add));
         }

Editor/Virtualization/Functions/IntRotateShift.cs

@@ -53,7 +53,7 @@ namespace Obfuz.Virtualization.Functions
             }
         }
 
-        public override void CompileSelf(CompileContext ctx, List<Instruction> output)
+        public override void CompileSelf(CompileContext ctx, List<IDataNode> inputs, List<Instruction> output)
         {
             output.Add(Instruction.Create(OpCodes.Xor));
         }

Editor/Virtualization/Functions/IntXor.cs

@@ -38,7 +38,7 @@ namespace Obfuz.Virtualization.Functions
             }
         }
 
-        public override void CompileSelf(CompileContext ctx, List<Instruction> output)
+        public override void CompileSelf(CompileContext ctx, List<IDataNode> inputs, List<Instruction> output)
         {
             output.Add(Instruction.Create(OpCodes.Xor));
         }

Editor/Virtualization/Functions/MemoryCastIntAsFloat.cs

@@ -0,0 +1,76 @@
+using dnlib.DotNet;
+using dnlib.DotNet.Emit;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Unity.Collections.LowLevel.Unsafe;
+using UnityEngine.Assertions;
+
+namespace Obfuz.Virtualization.DataNodes
+{
+    public class MemoryCastIntAsFloat : FunctionBase
+    {
+        private static IMethod s_castIntAsFloat;
+        private static IMethod s_castLongAsDouble;
+
+        private void InitMetadatas(ModuleDef mod)
+        {
+            if (s_castIntAsFloat !=  null)
+            {
+                return;
+            }
+            var constUtilityType = typeof(ConstUtility);
+            s_castIntAsFloat = mod.Import(constUtilityType.GetMethod("CastIntAsFloat"));
+            Assert.IsNotNull(s_castIntAsFloat, "CastIntAsFloat not found");
+            s_castLongAsDouble = mod.Import(constUtilityType.GetMethod("CastLongAsDouble"));
+            Assert.IsNotNull(s_castLongAsDouble, "CastLongAsDouble not found");
+        }
+
+        public override void CompileSelf(CompileContext ctx, List<IDataNode> inputs, List<Instruction> output)
+        {
+            Assert.AreEqual(1, inputs.Count);
+            InitMetadatas(ctx.method.Module);
+            switch (inputs[0].Type)
+            {
+                case DataNodeType.Int32:
+                {
+                    output.Add(Instruction.Create(OpCodes.Call, s_castIntAsFloat));
+                    break;
+                }
+                case DataNodeType.Int64:
+                {
+                    output.Add(Instruction.Create(OpCodes.Call, s_castLongAsDouble));
+                    break;
+                }
+                default: throw new NotSupportedException($"Unsupported type {inputs[0].Type} for MemoryCastIntAsFloat");
+            }
+        }
+
+        public override void CreateArguments(DataNodeType type, object v, CreateExpressionOptions options, List<ConstValue> args)
+        {
+            switch (type)
+            {
+                case DataNodeType.Float32:
+                {
+                    float value = (float)v;
+                    int intValue = ConstUtility.CastFloatAsInt(value);
+                    args.Add(new ConstValue(DataNodeType.Int32, intValue));
+                    break;
+                }
+                case DataNodeType.Float64:
+                {
+                    double value = (double)v;
+                    long longValue = ConstUtility.CastDoubleAsLong(value);
+                    args.Add(new ConstValue(DataNodeType.Int64, longValue));
+                    break;
+                }
+                default:
+                {
+                    throw new NotImplementedException($"Type:{type} not implemented");
+                }
+            }
+        }
+    }
+}

Editor/Virtualization/RandomDataNodeCreator.cs

@@ -1,5 +1,6 @@
 
 using Obfuz.Utils;
+using Obfuz.Virtualization.DataNodes;
 using Obfuz.Virtualization.Functions;
 using System.Collections.Generic;
 
@@ -14,7 +15,7 @@ namespace Obfuz.Virtualization
         public RandomDataNodeCreator(IRandom random)
         {
             _random = random;
-            var int32Funcs = new List<IFunction>()
+            var intFuncs = new List<IFunction>()
             {
                 new IntAdd(),
                 new IntXor(),
@@ -22,8 +23,15 @@ namespace Obfuz.Virtualization
                 //new ConstFromFieldRvaDataCreator(),
                 //new ConstDataCreator(),
             };
-            _functions.Add(DataNodeType.Int32, int32Funcs);
+            _functions.Add(DataNodeType.Int32, intFuncs);
-            _functions.Add(DataNodeType.Int64, int32Funcs);
+            _functions.Add(DataNodeType.Int64, intFuncs);
+
+            var floatFuncs = new List<IFunction>()
+            {
+                new MemoryCastIntAsFloat(),
+            };
+            _functions.Add(DataNodeType.Float32, floatFuncs);
+            _functions.Add(DataNodeType.Float64, floatFuncs);
         }
 
         public override IDataNode CreateRandom(DataNodeType type, object value, CreateExpressionOptions options)
@@ -41,7 +49,6 @@ namespace Obfuz.Virtualization
                     new ConstDataNode() { Type = type, Value = value };
             }
             var func = funcs[options.random.NextInt(funcs.Count)];
-            ++options.depth;
             return func.CreateExpr(type, value, options);
         }
 

Runtime/ConstUtility.cs

@@ -0,0 +1,64 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+using Unity.Collections.LowLevel.Unsafe;
+using UnityEngine;
+
+namespace Obfuz
+{
+    public static class ConstUtility
+    {
+        public static int GetInt(byte[] data, int offset)
+        {
+            return BitConverter.ToInt32(data, offset);
+        }
+
+        public static long GetLong(byte[] data, int offset)
+        {
+            return BitConverter.ToInt64(data, offset);
+        }
+
+        public static float GetFloat(byte[] data, int offset)
+        {
+            return BitConverter.ToSingle(data, offset);
+        }
+
+        public static double GetDouble(byte[] data, int offset)
+        {
+            return BitConverter.ToDouble(data, offset);
+        }
+
+        public static string GetString(byte[] data, int offset, int length)
+        {
+            return Encoding.UTF8.GetString(data, offset, length);
+        }
+
+        public static byte[] GetBytes(byte[] data, int offset, int length)
+        {
+            byte[] result = new byte[length];
+            Array.Copy(data, offset, result, 0, length);
+            return result;
+        }
+
+        public static int CastFloatAsInt(float value)
+        {
+            return UnsafeUtility.As<float, int>(ref value);
+        }
+
+        public static float CastIntAsFloat(int value)
+        {
+            return UnsafeUtility.As<int, float>(ref value);
+        }
+
+        public static long CastDoubleAsLong(double value)
+        {
+            return UnsafeUtility.As<double, long>(ref value);
+        }
+
+        public static double CastLongAsDouble(long value)
+        {
+            return UnsafeUtility.As<long, double>(ref value);
+        }
+    }
+}

Runtime/Obfuz.Runtime.asmdef

@@ -0,0 +1,14 @@
+{
+    "name": "Obfuz.Runtime",
+    "rootNamespace": "",
+    "references": [],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": true,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}