101 lines
4.1 KiB
C#
101 lines
4.1 KiB
C#
// Copyright 2025 Code Philosophy
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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using dnlib.DotNet;
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using Obfuz.Data;
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using Obfuz.Emit;
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using Obfuz.Settings;
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using Obfuz.Utils;
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namespace Obfuz.ObfusPasses.ControlFlowObfus
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{
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class ObfusMethodContext
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{
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public MethodDef method;
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public LocalVariableAllocator localVariableAllocator;
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public IRandom localRandom;
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public EncryptionScopeInfo encryptionScope;
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public DefaultMetadataImporter importer;
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public ConstFieldAllocator constFieldAllocator;
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public int minInstructionCountOfBasicBlockToObfuscate;
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public IRandom CreateRandom()
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{
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return encryptionScope.localRandomCreator(MethodEqualityComparer.CompareDeclaringTypes.GetHashCode(method));
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}
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}
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internal class ControlFlowObfusPass : ObfuscationMethodPassBase
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{
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private readonly ControlFlowObfuscationSettingsFacade _settings;
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private IObfuscationPolicy _obfuscationPolicy;
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private IObfuscator _obfuscator;
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public ControlFlowObfusPass(ControlFlowObfuscationSettingsFacade settings)
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{
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_settings = settings;
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_obfuscator = new DefaultObfuscator();
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}
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public override ObfuscationPassType Type => ObfuscationPassType.ControlFlowObfus;
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public override void Start()
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{
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ObfuscationPassContext ctx = ObfuscationPassContext.Current;
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_obfuscationPolicy = new ConfigurableObfuscationPolicy(
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ctx.coreSettings.assembliesToObfuscate,
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_settings.ruleFiles);
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}
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public override void Stop()
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{
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}
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protected override bool NeedObfuscateMethod(MethodDef method)
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{
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return _obfuscationPolicy.NeedObfuscate(method);
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}
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protected override void ObfuscateData(MethodDef method)
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{
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//Debug.Log($"Obfuscating method: {method.FullName} with EvalStackObfusPass");
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ObfuscationPassContext ctx = ObfuscationPassContext.Current;
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GroupByModuleEntityManager moduleEntityManager = ctx.moduleEntityManager;
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var encryptionScope = moduleEntityManager.EncryptionScopeProvider.GetScope(method.Module);
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var ruleData = _obfuscationPolicy.GetObfuscationRuleData(method);
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var localRandom = encryptionScope.localRandomCreator(MethodEqualityComparer.CompareDeclaringTypes.GetHashCode(method));
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var obfusMethodCtx = new ObfusMethodContext
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{
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method = method,
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localVariableAllocator = new LocalVariableAllocator(method),
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encryptionScope = encryptionScope,
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constFieldAllocator = moduleEntityManager.GetEntity<ConstFieldAllocator>(method.Module),
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localRandom = localRandom,
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importer = moduleEntityManager.GetEntity<DefaultMetadataImporter>(method.Module),
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minInstructionCountOfBasicBlockToObfuscate = _settings.minInstructionCountOfBasicBlockToObfuscate,
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};
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_obfuscator.Obfuscate(method, obfusMethodCtx);
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}
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}
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}
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