diff --git a/Editor/ObfusPasses/CallObfus/CallObfusPass.cs b/Editor/ObfusPasses/CallObfus/CallObfusPass.cs
index 7786450..15299c2 100644
--- a/Editor/ObfusPasses/CallObfus/CallObfusPass.cs
+++ b/Editor/ObfusPasses/CallObfus/CallObfusPass.cs
@@ -7,19 +7,21 @@ using System.Collections.Generic;
 
 namespace Obfuz.ObfusPasses.CallObfus
 {
+
     public class CallObfusPass : BasicBlockObfuscationPassBase
     {
         private readonly CallObfuscationSettingsFacade _settings;
+        private readonly SpecialWhiteListMethodCalculator _specialWhiteListMethodCache;
+
         private IObfuscator _dynamicProxyObfuscator;
         private IObfuscationPolicy _dynamicProxyPolicy;
-        private readonly CachedDictionary<IMethod, bool> _specialwhiteListMethodCache;
 
         public override ObfuscationPassType Type => ObfuscationPassType.CallObfus;
 
         public CallObfusPass(CallObfuscationSettingsFacade settings)
         {
             _settings = settings;
-            _specialwhiteListMethodCache = new CachedDictionary<IMethod, bool>(MethodEqualityComparer.CompareDeclaringTypes, this.ComputeIsInWhiteList);
+            _specialWhiteListMethodCache = new SpecialWhiteListMethodCalculator(settings.obfuscateCallToMethodInMscorlib);
         }
 
         public override void Stop()
@@ -39,106 +41,6 @@ namespace Obfuz.ObfusPasses.CallObfus
             return _dynamicProxyPolicy.NeedObfuscateCallInMethod(method);
         }
 
-
-        private static readonly HashSet<string> _specialTypeFullNames = new HashSet<string>
-        {
-            "System.Enum",
-            "System.Delegate",
-            "System.MulticastDelegate",
-            "Obfuz.EncryptionService`1",
-        };
-
-        private static readonly HashSet<string> _specialMethodNames = new HashSet<string>
-        {
-            "GetEnumerator", // List<T>.Enumerator.GetEnumerator()
-            ".ctor", // constructor
-        };
-
-        private static readonly HashSet<string> _specialMethodFullNames = new HashSet<string>
-        {
-            "System.Reflection.MethodBase.GetCurrentMethod",
-            "System.Reflection.Assembly.GetCallingAssembly",
-            "System.Reflection.Assembly.GetExecutingAssembly",
-            "System.Reflection.Assembly.GetEntryAssembly",
-        };
-
-        private bool ComputeIsInWhiteList(IMethod calledMethod)
-        {
-            MethodDef calledMethodDef = calledMethod.ResolveMethodDef();
-            // mono has more strict access control, calls non-public method will raise exception.
-            if (PlatformUtil.IsMonoBackend())
-            {
-                if (calledMethodDef != null && (!calledMethodDef.IsPublic || !IsTypeSelfAndParentPublic(calledMethodDef.DeclaringType)))
-                {
-                    return true;
-                }
-            }
-
-            ITypeDefOrRef declaringType = calledMethod.DeclaringType;
-            TypeSig declaringTypeSig = calledMethod.DeclaringType.ToTypeSig();
-            declaringTypeSig = declaringTypeSig.RemovePinnedAndModifiers();
-            switch (declaringTypeSig.ElementType)
-            {
-                case ElementType.ValueType:
-                case ElementType.Class:
-                {
-                    break;
-                }
-                case ElementType.GenericInst:
-                {
-                    if (MetaUtil.ContainsContainsGenericParameter(calledMethod))
-                    {
-                        return true;
-                    }
-                    break;
-                }
-                default: return true;
-            }
-
-            TypeDef typeDef = declaringType.ResolveTypeDef();
-
-            if (!_settings.obfuscateCallToMethodInMscorlib && typeDef.Module.IsCoreLibraryModule == true)
-            {
-                return true;
-            }
-
-            if (typeDef.IsDelegate || typeDef.IsEnum)
-                return true;
-
-            string fullName = typeDef.FullName;
-            if (_specialTypeFullNames.Contains(fullName))
-            {
-                return true;
-            }
-            //if (fullName.StartsWith("System.Runtime.CompilerServices."))
-            //{
-            //    return true;
-            //}
-
-            string methodName = calledMethod.Name;
-            if (_specialMethodNames.Contains(methodName))
-            {
-                return true;
-            }
-
-            string methodFullName = $"{fullName}.{methodName}";
-            if (_specialMethodFullNames.Contains(methodFullName))
-            {
-                return true;
-            }
-            return false;
-        }
-
-        private bool IsTypeSelfAndParentPublic(TypeDef type)
-        {
-            if (type.DeclaringType != null && !IsTypeSelfAndParentPublic(type.DeclaringType))
-            {
-                return false;
-            }
-
-            return type.IsPublic;
-        }
-
         protected override bool TryObfuscateInstruction(MethodDef callerMethod, Instruction inst, BasicBlock block,
             int instructionIndex, IList<Instruction> globalInstructions, List<Instruction> outputInstructions, List<Instruction> totalFinalInstructions)
         {
@@ -173,7 +75,7 @@ namespace Obfuz.ObfusPasses.CallObfus
             }
 
 
-            if (_specialwhiteListMethodCache.GetValue(calledMethod))
+            if (_specialWhiteListMethodCache.IsInWhiteList(calledMethod))
             {
                 return false;
             }
diff --git a/Editor/ObfusPasses/CallObfus/SpecialWhiteListMethodCalculator.cs b/Editor/ObfusPasses/CallObfus/SpecialWhiteListMethodCalculator.cs
new file mode 100644
index 0000000..5f52792
--- /dev/null
+++ b/Editor/ObfusPasses/CallObfus/SpecialWhiteListMethodCalculator.cs
@@ -0,0 +1,122 @@
+using dnlib.DotNet;
+using Obfuz.Utils;
+using System.Collections.Generic;
+
+namespace Obfuz.ObfusPasses.CallObfus
+{
+    class SpecialWhiteListMethodCalculator
+    {
+        private readonly bool _obfuscateCallToMethodInMscorlib;
+        private readonly CachedDictionary<IMethod, bool> _specialWhiteListMethodCache;
+
+        public SpecialWhiteListMethodCalculator(bool obfuscateCallToMethodInMscorlib)
+        {
+            _obfuscateCallToMethodInMscorlib = obfuscateCallToMethodInMscorlib;
+            _specialWhiteListMethodCache = new CachedDictionary<IMethod, bool>(MethodEqualityComparer.CompareDeclaringTypes, this.ComputeIsInWhiteList);
+        }
+
+        public bool IsInWhiteList(IMethod calledMethod)
+        {
+            return _specialWhiteListMethodCache.GetValue(calledMethod);
+        }
+
+        private static readonly HashSet<string> _specialTypeFullNames = new HashSet<string>
+        {
+            "System.Enum",
+            "System.Delegate",
+            "System.MulticastDelegate",
+            "Obfuz.EncryptionService`1",
+        };
+
+        private static readonly HashSet<string> _specialMethodNames = new HashSet<string>
+        {
+            "GetEnumerator", // List<T>.Enumerator.GetEnumerator()
+            ".ctor", // constructor
+        };
+
+        private static readonly HashSet<string> _specialMethodFullNames = new HashSet<string>
+        {
+            "System.Reflection.MethodBase.GetCurrentMethod",
+            "System.Reflection.Assembly.GetCallingAssembly",
+            "System.Reflection.Assembly.GetExecutingAssembly",
+            "System.Reflection.Assembly.GetEntryAssembly",
+        };
+
+        private bool ComputeIsInWhiteList(IMethod calledMethod)
+        {
+            MethodDef calledMethodDef = calledMethod.ResolveMethodDef();
+            // mono has more strict access control, calls non-public method will raise exception.
+            if (PlatformUtil.IsMonoBackend())
+            {
+                if (calledMethodDef != null && (!calledMethodDef.IsPublic || !IsTypeSelfAndParentPublic(calledMethodDef.DeclaringType)))
+                {
+                    return true;
+                }
+            }
+
+            ITypeDefOrRef declaringType = calledMethod.DeclaringType;
+            TypeSig declaringTypeSig = calledMethod.DeclaringType.ToTypeSig();
+            declaringTypeSig = declaringTypeSig.RemovePinnedAndModifiers();
+            switch (declaringTypeSig.ElementType)
+            {
+                case ElementType.ValueType:
+                case ElementType.Class:
+                {
+                    break;
+                }
+                case ElementType.GenericInst:
+                {
+                    if (MetaUtil.ContainsContainsGenericParameter(calledMethod))
+                    {
+                        return true;
+                    }
+                    break;
+                }
+                default: return true;
+            }
+
+            TypeDef typeDef = declaringType.ResolveTypeDef();
+
+            if (!_obfuscateCallToMethodInMscorlib && typeDef.Module.IsCoreLibraryModule == true)
+            {
+                return true;
+            }
+
+            if (typeDef.IsDelegate || typeDef.IsEnum)
+                return true;
+
+            string fullName = typeDef.FullName;
+            if (_specialTypeFullNames.Contains(fullName))
+            {
+                return true;
+            }
+            //if (fullName.StartsWith("System.Runtime.CompilerServices."))
+            //{
+            //    return true;
+            //}
+
+            string methodName = calledMethod.Name;
+            if (_specialMethodNames.Contains(methodName))
+            {
+                return true;
+            }
+
+            string methodFullName = $"{fullName}.{methodName}";
+            if (_specialMethodFullNames.Contains(methodFullName))
+            {
+                return true;
+            }
+            return false;
+        }
+
+        private bool IsTypeSelfAndParentPublic(TypeDef type)
+        {
+            if (type.DeclaringType != null && !IsTypeSelfAndParentPublic(type.DeclaringType))
+            {
+                return false;
+            }
+
+            return type.IsPublic;
+        }
+    }
+}
diff --git a/Editor/ObfusPasses/CallObfus/SpecialWhiteListMethodCalculator.cs.meta b/Editor/ObfusPasses/CallObfus/SpecialWhiteListMethodCalculator.cs.meta
new file mode 100644
index 0000000..b1228ec
--- /dev/null
+++ b/Editor/ObfusPasses/CallObfus/SpecialWhiteListMethodCalculator.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 904e80c4b98911c40b6a9173ca24f3ee
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: