Initial commit

.gitignore

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+.idea/
+bin/
+obj/
+*.dll
+*.pem
+.vscode/

Program.cs

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+using System;
+using System.IO;
+using System.Linq;
+using System.Security.Cryptography.X509Certificates;
+using Mono.Cecil;
+using Mono.Cecil.Cil;
+using Mono.Cecil.Rocks;
+
+namespace bitwardenSelfLicensor
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            string cerFile;
+            string corePath;
+
+            if(args.Length >= 2) {
+                cerFile = args[0];
+                corePath = args[1];
+            } else if (args.Length == 1) {
+                cerFile = args[0];
+                corePath = "/app/Core.dll";
+            }
+            else {
+                cerFile = "/newLicensing.cer";
+                corePath = "/app/Core.dll";
+            }
+
+
+            var module =  ModuleDefinition.ReadModule(new MemoryStream(File.ReadAllBytes(corePath)));
+            var cert = File.ReadAllBytes(cerFile);
+
+            var x = module.Resources.OfType<EmbeddedResource>()
+                                    .Where(r => r.Name.Equals("Bit.Core.licensing.cer"))
+                                    .First();
+
+            Console.WriteLine(x.Name);
+
+            var e = new EmbeddedResource("Bit.Core.licensing.cer", x.Attributes, cert);
+
+            module.Resources.Add(e);
+            module.Resources.Remove(x);
+
+            var services = module.Types.Where(t => t.Namespace == "Bit.Core.Services");
+            
+
+            var type = services.First(t => t.Name == "LicensingService");
+
+            var licensingType =  type.Resolve();
+
+            var existingCert = new X509Certificate2(x.GetResourceData());
+
+            Console.WriteLine($"Existing Cert Thumbprin: {existingCert.Thumbprint}");
+            X509Certificate2 certificate = new X509Certificate2(cert);
+
+            Console.WriteLine($"New cert Thumbprint: {certificate.Thumbprint}");
+
+            var ctor = licensingType.GetConstructors().Single();
+
+
+            var rewriter = ctor.Body.GetILProcessor();
+
+            var instToReplace = 
+                ctor.Body.Instructions.Where(i => i.OpCode == OpCodes.Ldstr
+                    && string.Equals((string)i.Operand, existingCert.Thumbprint, StringComparison.InvariantCultureIgnoreCase))
+                .FirstOrDefault();
+
+            if(instToReplace != null) {
+                rewriter.Replace(instToReplace, Instruction.Create(OpCodes.Ldstr, certificate.Thumbprint));
+            }
+            else {
+                Console.WriteLine("Cant find inst");
+            }
+
+            // foreach (var inst in ctor.Body.Instructions)
+            // {
+            //     Console.Write(inst.OpCode.Name + " " + inst.Operand?.GetType() + " = ");
+            //     if(inst.OpCode.FlowControl == FlowControl.Call) {
+            //         Console.WriteLine(inst.Operand);
+            //     }
+            //     else if(inst.OpCode == OpCodes.Ldstr) {
+            //         Console.WriteLine(inst.Operand);
+            //     }
+            //     else {Console.WriteLine();}
+            // }
+
+            module.Write("modified.dll");
+        }
+    }
+}

bitwardenSelfLicensor.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Mono.Cecil" Version="0.10.0-beta6" />
+  </ItemGroup>
+
+</Project>

bitwardenSelfLicensor.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2013
+VisualStudioVersion = 12.0.0.0
+MinimumVisualStudioVersion = 10.0.0.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "bitwardenSelfLicensor", "bitwardenSelfLicensor.csproj", "{583CBED9-EA04-4E5A-BE5B-31370052D4E2}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{583CBED9-EA04-4E5A-BE5B-31370052D4E2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{583CBED9-EA04-4E5A-BE5B-31370052D4E2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{583CBED9-EA04-4E5A-BE5B-31370052D4E2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{583CBED9-EA04-4E5A-BE5B-31370052D4E2}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal