AssemblyName.SetPublicKeyToken(Byte[]) Method

Definition

Namespace:

System.Reflection

Assembly:

System.Runtime.dll

Source:

AssemblyName.cs

Sets the public key token, which is the last 8 bytes of the SHA-1 hash of the public key under which the application or assembly is signed.

public:
 void SetPublicKeyToken(cli::array <System::Byte> ^ publicKeyToken);

public void SetPublicKeyToken (byte[]? publicKeyToken);

member this.SetPublicKeyToken : byte[] -> unit

Public Sub SetPublicKeyToken (publicKeyToken As Byte())

Parameters

publicKeyToken

Byte[]

A byte array containing the public key token of the assembly.

Examples

The following example emits a dynamic assembly and saves it to the current directory. When the assembly is created, the SetPublicKeyToken method is used to set the assembly's public key token. The GetPublicKeyToken method is then used to retrieve the public key token, which is displayed to the console.

using namespace System;
using namespace System::Reflection;
using namespace System::Threading;
using namespace System::IO;
using namespace System::Globalization;
using namespace System::Reflection::Emit;
using namespace System::Configuration::Assemblies;
using namespace System::Text;

static void MakeAssembly( AssemblyName^ myAssemblyName, String^ fileName )
{
   // Get the assembly builder from the application domain associated with the current thread.
   AssemblyBuilder^ myAssemblyBuilder = Thread::GetDomain()->DefineDynamicAssembly( myAssemblyName, AssemblyBuilderAccess::RunAndSave );

   // Create a dynamic module in the assembly.
   ModuleBuilder^ myModuleBuilder = myAssemblyBuilder->DefineDynamicModule( "MyModule", fileName );

   // Create a type in the module.
   TypeBuilder^ myTypeBuilder = myModuleBuilder->DefineType( "MyType" );

   // Create a method called 'Main'.
   MethodBuilder^ myMethodBuilder = myTypeBuilder->DefineMethod( "Main", static_cast<MethodAttributes>(MethodAttributes::Public | MethodAttributes::HideBySig | MethodAttributes::Static), void::typeid, nullptr );

   // Get the Intermediate Language generator for the method.
   ILGenerator^ myILGenerator = myMethodBuilder->GetILGenerator();

   // Use the utility method to generate the IL instructions that print a String* to the console.
   myILGenerator->EmitWriteLine( "Hello World!" );

   // Generate the 'ret' IL instruction.
   myILGenerator->Emit( OpCodes::Ret );

   // End the creation of the type.
   myTypeBuilder->CreateType();

   // Set the method with name 'Main' as the entry point in the assembly.
   myAssemblyBuilder->SetEntryPoint( myMethodBuilder );
   myAssemblyBuilder->Save( fileName );
}

int main()
{
   // Create a dynamic assembly with name 'MyAssembly' and build version '1.0.0.2001'.
   AssemblyName^ myAssemblyName = gcnew AssemblyName;

   // Set the codebase to the physical directory were the assembly resides.
   myAssemblyName->CodeBase = Directory::GetCurrentDirectory();

   // Set the culture information of the assembly to 'English-American'.
   myAssemblyName->CultureInfo = gcnew CultureInfo( "en-US" );

   // Set the hash algorithm to 'SHA256'.
   myAssemblyName->HashAlgorithm = AssemblyHashAlgorithm::SHA256;
   myAssemblyName->VersionCompatibility = AssemblyVersionCompatibility::SameProcess;
   myAssemblyName->Flags = AssemblyNameFlags::PublicKey;

   // Get the whole contents of the 'PublicKey.snk' into a Byte array.
   FileStream^ publicKeyStream = File::Open( "PublicKey.snk", FileMode::Open );
   array<Byte>^publicKey = gcnew array<Byte>(publicKeyStream->Length);
   publicKeyStream->Read( publicKey, 0, (int)publicKeyStream->Length );

   // Provide the assembly with a public key.
   myAssemblyName->SetPublicKey( publicKey );

   // Get the whole contents of the 'PublicKeyToken.snk' into a Byte array.
   FileStream^ publicKeyTokenStream = File::Open( "PublicKeyToken.snk", FileMode::Open );
   array<Byte>^publicKeyToken = gcnew array<Byte>(publicKeyTokenStream->Length);
   publicKeyTokenStream->Read( publicKeyToken, 0, (int)publicKeyToken->Length );

   // Provide the assembly with a public key token.
   myAssemblyName->SetPublicKeyToken( publicKeyToken );
   myAssemblyName->Name = "MyAssembly";
   myAssemblyName->Version = gcnew Version( "1.0.0.2001" );
   MakeAssembly( myAssemblyName, "MyAssembly.exe" );

   // Get the assemblies loaded in the current application domain.
   array<Assembly^>^myAssemblies = Thread::GetDomain()->GetAssemblies();

   // Get the dynamic assembly named 'MyAssembly'. 
   Assembly^ myAssembly = nullptr;
   for ( int i = 0; i < myAssemblies->Length; i++ )
      if ( String::Compare( myAssemblies[ i ]->GetName()->Name, "MyAssembly" ) == 0 )
            myAssembly = myAssemblies[ i ];

   // Display the full assembly information to the console.
   if ( myAssembly != nullptr )
   {
      Console::WriteLine( "\nDisplaying the full assembly name\n" );
      String^ assemblyName = myAssembly->GetName()->FullName;
      Console::WriteLine( assemblyName );
      Console::WriteLine( "\nDisplaying the public key for the assembly\n" );
      array<Byte>^publicKeyBytes = myAssembly->GetName()->GetPublicKey();
      Console::WriteLine( Encoding::ASCII->GetString( publicKeyBytes ) );
      Console::WriteLine( "\nDisplaying the public key token for the assembly\n" );
      array<Byte>^publicKeyTokenBytes = myAssembly->GetName()->GetPublicKeyToken();
      Console::WriteLine( Encoding::ASCII->GetString( publicKeyTokenBytes ) );
   }
}

using System;
using System.Reflection;
using System.Threading;
using System.IO;
using System.Globalization;
using System.Reflection.Emit;
using System.Configuration.Assemblies;
using System.Text;

public class AssemblyName_CodeBase
{
   public static void MakeAssembly(AssemblyName myAssemblyName, string fileName)
   {
      // Get the assembly builder from the application domain associated with the current thread.
      AssemblyBuilder myAssemblyBuilder = Thread.GetDomain().DefineDynamicAssembly(myAssemblyName, AssemblyBuilderAccess.RunAndSave);
      // Create a dynamic module in the assembly.
      ModuleBuilder myModuleBuilder = myAssemblyBuilder.DefineDynamicModule("MyModule", fileName);
      // Create a type in the module.
      TypeBuilder myTypeBuilder = myModuleBuilder.DefineType("MyType");
      // Create a method called 'Main'.
      MethodBuilder myMethodBuilder = myTypeBuilder.DefineMethod("Main", MethodAttributes.Public | MethodAttributes.HideBySig |
         MethodAttributes.Static, typeof(void), null);
      // Get the Intermediate Language generator for the method.
      ILGenerator myILGenerator = myMethodBuilder.GetILGenerator();
      // Use the utility method to generate the IL instructions that print a string to the console.
      myILGenerator.EmitWriteLine("Hello World!");
      // Generate the 'ret' IL instruction.
      myILGenerator.Emit(OpCodes.Ret);
      // End the creation of the type.
      myTypeBuilder.CreateType();
      // Set the method with name 'Main' as the entry point in the assembly.
      myAssemblyBuilder.SetEntryPoint(myMethodBuilder);
      myAssemblyBuilder.Save(fileName);
   }

   public static void Main()
   {
      // Create a dynamic assembly with name 'MyAssembly' and build version '1.0.0.2001'.
      AssemblyName myAssemblyName = new AssemblyName();
      // Set the codebase to the physical directory were the assembly resides.
      myAssemblyName.CodeBase = Directory.GetCurrentDirectory();
      // Set the culture information of the assembly to 'English-American'.
      myAssemblyName.CultureInfo = new CultureInfo("en-US");
      // Set the hash algorithm to 'SHA256'.
      myAssemblyName.HashAlgorithm = AssemblyHashAlgorithm.SHA256;
      myAssemblyName.VersionCompatibility = AssemblyVersionCompatibility.SameProcess;
      myAssemblyName.Flags = AssemblyNameFlags.PublicKey;
      // Get the whole contents of the 'PublicKey.snk' into a byte array.
      FileStream publicKeyStream = File.Open("PublicKey.snk", FileMode.Open);
      byte[] publicKey = new byte[publicKeyStream.Length];
      publicKeyStream.Read(publicKey, 0, (int)publicKeyStream.Length);
      // Provide the assembly with a public key.
      myAssemblyName.SetPublicKey(publicKey);
      // Get the whole contents of the 'PublicKeyToken.snk' into a byte array.
      FileStream publicKeyTokenStream = File.Open("PublicKeyToken.snk", FileMode.Open);
      byte[] publicKeyToken = new Byte[publicKeyTokenStream.Length];
      publicKeyTokenStream.Read(publicKeyToken, 0, (int)publicKeyToken.Length);
      // Provide the assembly with a public key token.
      myAssemblyName.SetPublicKeyToken(publicKeyToken);
      myAssemblyName.Name = "MyAssembly";
      myAssemblyName.Version = new Version("1.0.0.2001");
      MakeAssembly(myAssemblyName, "MyAssembly.exe");

      // Get the assemblies loaded in the current application domain.
      Assembly[] myAssemblies = Thread.GetDomain().GetAssemblies();

      // Get the dynamic assembly named 'MyAssembly'.
      Assembly myAssembly = null;
      for(int i = 0; i < myAssemblies.Length; i++)
         if(String.Compare(myAssemblies[i].GetName().Name, "MyAssembly") == 0)
            myAssembly = myAssemblies[i];

      // Display the full assembly information to the console.
      if(myAssembly != null)
      {
         Console.WriteLine("\nDisplaying the full assembly name\n");
         string assemblyName = myAssembly.GetName().FullName;
         Console.WriteLine(assemblyName);
         Console.WriteLine("\nDisplaying the public key for the assembly\n");
         byte[] publicKeyBytes = myAssembly.GetName().GetPublicKey();
         Console.WriteLine(Encoding.ASCII.GetString(publicKeyBytes));
         Console.WriteLine("\nDisplaying the public key token for the assembly\n");
         byte[] publicKeyTokenBytes = myAssembly.GetName().GetPublicKeyToken();
         Console.WriteLine(Encoding.ASCII.GetString(publicKeyTokenBytes));
      }
   }
}

Imports System.Reflection
Imports System.Threading
Imports System.IO
Imports System.Globalization
Imports System.Reflection.Emit
Imports System.Configuration.Assemblies
Imports System.Text

Public Class AssemblyName_CodeBase
   
   Public Shared Sub MakeAssembly(myAssemblyName As AssemblyName, fileName As String)
      ' Get the assembly builder from the application domain associated with the current thread.
      Dim myAssemblyBuilder As AssemblyBuilder = Thread.GetDomain().DefineDynamicAssembly(myAssemblyName, AssemblyBuilderAccess.RunAndSave)
      ' Create a dynamic module in the assembly.
      Dim myModuleBuilder As ModuleBuilder = myAssemblyBuilder.DefineDynamicModule("MyModule", fileName)
      ' Create a type in the module.
      Dim myTypeBuilder As TypeBuilder = myModuleBuilder.DefineType("MyType")
      ' Create a method called 'Main'.
      Dim myMethodBuilder As MethodBuilder = myTypeBuilder.DefineMethod("Main", MethodAttributes.Public Or MethodAttributes.HideBySig Or MethodAttributes.Static, GetType(object), Nothing)
      ' Get the Intermediate Language generator for the method.
      Dim myILGenerator As ILGenerator = myMethodBuilder.GetILGenerator()
      ' Use the utility method to generate the IL instructions that print a string to the console.
      myILGenerator.EmitWriteLine("Hello World!")
      ' Generate the 'ret' IL instruction.
      myILGenerator.Emit(OpCodes.Ret)
      ' End the creation of the type.
      myTypeBuilder.CreateType()
      ' Set the method with name 'Main' as the entry point in the assembly.
      myAssemblyBuilder.SetEntryPoint(myMethodBuilder)
      myAssemblyBuilder.Save(fileName)
   End Sub
   
   
   Public Shared Sub Main()
      ' Create a dynamic assembly with name 'MyAssembly' and build version '1.0.0.2001'.
      Dim myAssemblyName As New AssemblyName()
      ' Set the codebase to the physical directory were the assembly resides.
      myAssemblyName.CodeBase = Directory.GetCurrentDirectory()
      ' Set the culture information of the assembly to 'English-American'.
      myAssemblyName.CultureInfo = New CultureInfo("en-US")
      ' Set the hash algorithm to 'SHA256'.
      myAssemblyName.HashAlgorithm = AssemblyHashAlgorithm.SHA256
      myAssemblyName.VersionCompatibility = AssemblyVersionCompatibility.SameProcess
      myAssemblyName.Flags = AssemblyNameFlags.PublicKey
      ' Get the whole contents of the 'PublicKey.snk' into a byte array.
      Dim publicKeyStream As FileStream = File.Open("PublicKey.snk", FileMode.Open)
      Dim publicKey(publicKeyStream.Length - 1) As Byte
      publicKeyStream.Read(publicKey, 0, CInt(publicKeyStream.Length))
      ' Provide the assembly with a public key.
      myAssemblyName.SetPublicKey(publicKey)
      ' Get the whole contents of the 'PublicKeyToken.snk' into a byte array.
      Dim publicKeyTokenStream As FileStream = File.Open("PublicKeyToken.snk", FileMode.Open)
      Dim publicKeyToken() As Byte = New [Byte](publicKeyTokenStream.Length) {}
      publicKeyTokenStream.Read(publicKeyToken, 0, CInt(publicKeyToken.Length))
      ' Provide the assembly with a public key token.
      myAssemblyName.SetPublicKeyToken(publicKeyToken)
      myAssemblyName.Name = "MyAssembly"
      myAssemblyName.Version = New Version("1.0.0.2001")
      MakeAssembly(myAssemblyName, "MyAssembly.exe")
      
      ' Get the assemblies loaded in the current application domain.
      Dim myAssemblies As [Assembly]() = Thread.GetDomain().GetAssemblies()
      
      ' Get the dynamic assembly named 'MyAssembly'. 
      Dim myAssembly As [Assembly] = Nothing
      Dim i As Integer
      For i = 0 To myAssemblies.Length - 1
         If [String].Compare(myAssemblies(i).GetName().Name, "MyAssembly") = 0 Then
            myAssembly = myAssemblies(i)
         End If 
      Next i ' Display the full assembly information to the console.
      If Not (myAssembly Is Nothing) Then
         Console.WriteLine(ControlChars.Cr + "Displaying the full assembly name" + ControlChars.Cr)
         Dim assemblyName As String = myAssembly.GetName().FullName
         Console.WriteLine(assemblyName)
         Console.WriteLine(ControlChars.Cr + "Displaying the public key for the assembly" + ControlChars.Cr)
         Dim publicKeyBytes As Byte() = myAssembly.GetName().GetPublicKey()
         Console.WriteLine(Encoding.ASCII.GetString(publicKeyBytes))
         Console.WriteLine(ControlChars.Cr + "Displaying the public key token for the assembly" + ControlChars.Cr)
         Dim publicKeyTokenBytes As Byte() = myAssembly.GetName().GetPublicKeyToken()
         Console.WriteLine(Encoding.ASCII.GetString(publicKeyTokenBytes))
      End If
   End Sub
End Class

Remarks

When you set the public key by calling the SetPublicKey method, you must also use the SetPublicKeyToken method to provide a public key token. Otherwise, a SecurityException is thrown when the GetPublicKey method is called.