TripleDES.Create Methode

Referenz

Definition

Namespace:: System.Security.Cryptography

Assembly:: System.Security.Cryptography.Algorithms.dll

Assembly:: netstandard.dll

Assembly:: mscorlib.dll

Wichtig

Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.

Erstellt eine Instanz eines Kryptografieobjekts, um den TripleDES-Algorithmus auszuführen.

Überlädt

Create()	Erstellt eine Instanz eines Kryptografieobjekts, um den TripleDES-Algorithmus auszuführen.
Create(String)	Erstellt eine Instanz eines Kryptografieobjekts, um die angegebene Implementierung des TripleDES-Algorithmus auszuführen.

Create()

Erstellt eine Instanz eines Kryptografieobjekts, um den TripleDES-Algorithmus auszuführen.

public:
 static System::Security::Cryptography::TripleDES ^ Create();

public static System.Security.Cryptography.TripleDES Create ();

static member Create : unit -> System.Security.Cryptography.TripleDES

Public Shared Function Create () As TripleDES

Gibt zurück

TripleDES

Eine Instanz eines Kryptografieobjekts.

Beispiele

Das folgende Codebeispiel zeigt, wie Sie ein -Objekt erstellen und TripleDES verwenden, um Daten in einer Datei zu verschlüsseln und zu entschlüsseln.

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;
using namespace System::IO;
void EncryptTextToFile( String^ Data, String^ FileName, array<Byte>^Key, array<Byte>^IV )
{
   try
   {
      
      // Create or open the specified file.
      FileStream^ fStream = File::Open( FileName, FileMode::OpenOrCreate );
      
      // Create a new TripleDES object.
      TripleDES^ tripleDESalg = TripleDES::Create();
      
      // Create a CryptoStream using the FileStream 
      // and the passed key and initialization vector (IV).
      CryptoStream^ cStream = gcnew CryptoStream( fStream,tripleDESalg->CreateEncryptor( Key, IV ),CryptoStreamMode::Write );
      
      // Create a StreamWriter using the CryptoStream.
      StreamWriter^ sWriter = gcnew StreamWriter( cStream );
      
      // Write the data to the stream 
      // to encrypt it.
      sWriter->WriteLine( Data );
      
      // Close the streams and
      // close the file.
      sWriter->Close();
      cStream->Close();
      fStream->Close();
   }
   catch ( CryptographicException^ e ) 
   {
      Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
   }
   catch ( UnauthorizedAccessException^ e ) 
   {
      Console::WriteLine( "A file access error occurred: {0}", e->Message );
   }

}

String^ DecryptTextFromFile( String^ FileName, array<Byte>^Key, array<Byte>^IV )
{
   try
   {
      
      // Create or open the specified file. 
      FileStream^ fStream = File::Open( FileName, FileMode::OpenOrCreate );
      
      // Create a new TripleDES object.
      TripleDES^ tripleDESalg = TripleDES::Create();
      
      // Create a CryptoStream using the FileStream 
      // and the passed key and initialization vector (IV).
      CryptoStream^ cStream = gcnew CryptoStream( fStream,tripleDESalg->CreateDecryptor( Key, IV ),CryptoStreamMode::Read );
      
      // Create a StreamReader using the CryptoStream.
      StreamReader^ sReader = gcnew StreamReader( cStream );
      
      // Read the data from the stream 
      // to decrypt it.
      String^ val = sReader->ReadLine();
      
      // Close the streams and
      // close the file.
      sReader->Close();
      cStream->Close();
      fStream->Close();
      
      // Return the string. 
      return val;
   }
   catch ( CryptographicException^ e ) 
   {
      Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
      return nullptr;
   }
   catch ( UnauthorizedAccessException^ e ) 
   {
      Console::WriteLine( "A file access error occurred: {0}", e->Message );
      return nullptr;
   }

}

int main()
{
   try
   {
      
      // Create a new TripleDES object to generate a key
      // and an initialization vector (IV).
      TripleDES^ TripleDESalg = TripleDES::Create();
      
      // Create a string to encrypt.
      String^ sData = "Here is some data to encrypt.";
      String^ FileName = "CText.txt";
      
      // Encrypt text to a file using the file name, key, and IV.
      EncryptTextToFile( sData, FileName, TripleDESalg->Key, TripleDESalg->IV );
      
      // Decrypt the text from a file using the file name, key, and IV.
      String^ Final = DecryptTextFromFile( FileName, TripleDESalg->Key, TripleDESalg->IV );
      
      // Display the decrypted string to the console.
      Console::WriteLine( Final );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( e->Message );
   }

}

using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;

class TripleDESSample
{

    static void Main()
    {
        try
        {
            // Create a new TripleDES object to generate a key
            // and an initialization vector (IV).
            using (TripleDES TripleDESalg = TripleDES.Create())
            {
                // Create a string to encrypt.
                string sData = "Here is some data to encrypt.";
                string FileName = "CText.enc";

                // Encrypt text to a file using the file name, key, and IV.
                EncryptTextToFile(sData, FileName, TripleDESalg.Key, TripleDESalg.IV);

                // Decrypt the text from a file using the file name, key, and IV.
                string Final = DecryptTextFromFile(FileName, TripleDESalg.Key, TripleDESalg.IV);

                // Display the decrypted string to the console.
                Console.WriteLine(Final);
            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }

    public static void EncryptTextToFile(String Data, String FileName, byte[] Key, byte[] IV)
    {
        try
        {
            // Create or open the specified file.
            using (FileStream fStream = File.Open(FileName, FileMode.OpenOrCreate))
            {

                // Create a new TripleDES object.
                using (TripleDES tripleDESalg = TripleDES.Create())
                {

                    // Create a CryptoStream using the FileStream
                    // and the passed key and initialization vector (IV).
                    using (CryptoStream cStream = new CryptoStream(fStream,
                        tripleDESalg.CreateEncryptor(Key, IV),
                        CryptoStreamMode.Write))
                    {

                        // Create a StreamWriter using the CryptoStream.
                        using (StreamWriter sWriter = new StreamWriter(cStream))
                        {

                            // Write the data to the stream
                            // to encrypt it.
                            sWriter.WriteLine(Data);
                        }
                    }
                }
            }
        }
        catch (CryptographicException e)
        {
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
        }
        catch (UnauthorizedAccessException e)
        {
            Console.WriteLine("A file access error occurred: {0}", e.Message);
        }
    }

    public static string DecryptTextFromFile(String FileName, byte[] Key, byte[] IV)
    {
        try
        {
            string retVal = "";
            // Create or open the specified file.
            using (FileStream fStream = File.Open(FileName, FileMode.OpenOrCreate))
            {

                // Create a new TripleDES object.
                using (TripleDES tripleDESalg = TripleDES.Create())
                {

                    // Create a CryptoStream using the FileStream
                    // and the passed key and initialization vector (IV).
                    using (CryptoStream cStream = new CryptoStream(fStream,
                        tripleDESalg.CreateDecryptor(Key, IV),
                        CryptoStreamMode.Read))
                    {

                        // Create a StreamReader using the CryptoStream.
                        using (StreamReader sReader = new StreamReader(cStream))
                        {

                            // Read the data from the stream
                            // to decrypt it.
                            retVal = sReader.ReadLine();
                        }
                    }
                }
            }
            // Return the string.
            return retVal;
        }
        catch (CryptographicException e)
        {
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
            return null;
        }
        catch (UnauthorizedAccessException e)
        {
            Console.WriteLine("A file access error occurred: {0}", e.Message);
            return null;
        }
    }
}

Imports System.Security.Cryptography
Imports System.Text
Imports System.IO

Module TripleDESSample

    Sub Main()
        Try
            ' Create a new TripleDES object to generate a key
            ' and initialization vector (IV).
            Using TripleDESalg As TripleDES = TripleDES.Create

                ' Create a string to encrypt.
                Dim sData As String = "Here is some data to encrypt."
                Dim FileName As String = "CText.txt"

                ' Encrypt text to a file using the file name, key, and IV.
                EncryptTextToFile(sData, FileName, TripleDESalg.Key, TripleDESalg.IV)

                ' Decrypt the text from a file using the file name, key, and IV.
                Dim Final As String = DecryptTextFromFile(FileName, TripleDESalg.Key, TripleDESalg.IV)

                ' Display the decrypted string to the console.
                Console.WriteLine(Final)
            End Using
        Catch e As Exception
            Console.WriteLine(e.Message)
        End Try
    End Sub


    Sub EncryptTextToFile(ByVal Data As String, ByVal FileName As String,
ByVal Key() As Byte, ByVal IV() As Byte)
        Try
            ' Create or open the specified file.
            Using fStream As FileStream = File.Open(FileName, FileMode.OpenOrCreate)

                ' Create a new TripleDES object.
                Using TripleDESalg As TripleDES = TripleDES.Create

                    ' Create a CryptoStream using the FileStream 
                    ' and the passed key and initialization vector (IV).
                    Using cStream As New CryptoStream(fStream, _
                        TripleDESalg.CreateEncryptor(Key, IV), _
                        CryptoStreamMode.Write)

                        ' Create a StreamWriter using the CryptoStream.
                        Using sWriter As New StreamWriter(cStream)

                            ' Write the data to the stream 
                            ' to encrypt it.
                            sWriter.WriteLine(Data)

                        End Using
                    End Using
                End Using
            End Using


        Catch e As CryptographicException
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
        Catch e As UnauthorizedAccessException
            Console.WriteLine("A file access error occurred: {0}", e.Message)
        End Try
    End Sub


    Function DecryptTextFromFile(ByVal FileName As String, ByVal Key() As Byte, ByVal IV() As Byte) As String
        Try
            Dim retVal As String
            ' Create or open the specified file. 
            Using fStream As FileStream = File.Open(FileName, FileMode.OpenOrCreate)

                ' Create a new TripleDES object.
                Using TripleDESalg As TripleDES = TripleDES.Create

                    ' Create a CryptoStream using the FileStream 
                    ' and the passed key and initialization vector (IV).
                    Using cStream As New CryptoStream(fStream, _
                        TripleDESalg.CreateDecryptor(Key, IV), CryptoStreamMode.Read)

                        ' Create a StreamReader using the CryptoStream.
                        Using sReader As New StreamReader(cStream)

                            ' Read the data from the stream 
                            ' to decrypt it.
                            retVal = sReader.ReadLine()
                        End Using
                    End Using
                End Using
            End Using

            Return retVal
        Catch e As CryptographicException
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
            Return Nothing
        Catch e As UnauthorizedAccessException
            Console.WriteLine("A file access error occurred: {0}", e.Message)
            Return Nothing
        End Try
    End Function
End Module

Das folgende Codebeispiel zeigt, wie Sie ein -Objekt erstellen und TripleDES verwenden, um Daten im Arbeitsspeicher zu verschlüsseln und zu entschlüsseln.

#using <System.dll>

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;
using namespace System::IO;
array<Byte>^ EncryptTextToMemory( String^ Data, array<Byte>^Key, array<Byte>^IV )
{
   try
   {
      
      // Create a MemoryStream.
      MemoryStream^ mStream = gcnew MemoryStream;
      
      // Create a new TripleDES object.
      TripleDES^ tripleDESalg = TripleDES::Create();
      
      // Create a CryptoStream using the MemoryStream 
      // and the passed key and initialization vector (IV).
      CryptoStream^ cStream = gcnew CryptoStream( mStream,tripleDESalg->CreateEncryptor( Key, IV ),CryptoStreamMode::Write );
      
      // Convert the passed string to a byte array.
      array<Byte>^toEncrypt = (gcnew ASCIIEncoding)->GetBytes( Data );
      
      // Write the byte array to the crypto stream and flush it.
      cStream->Write( toEncrypt, 0, toEncrypt->Length );
      cStream->FlushFinalBlock();
      
      // Get an array of bytes from the 
      // MemoryStream that holds the 
      // encrypted data.
      array<Byte>^ret = mStream->ToArray();
      
      // Close the streams.
      cStream->Close();
      mStream->Close();
      
      // Return the encrypted buffer.
      return ret;
   }
   catch ( CryptographicException^ e ) 
   {
      Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
      return nullptr;
   }

}

String^ DecryptTextFromMemory( array<Byte>^Data, array<Byte>^Key, array<Byte>^IV )
{
   try
   {
      
      // Create a new MemoryStream using the passed 
      // array of encrypted data.
      MemoryStream^ msDecrypt = gcnew MemoryStream( Data );
      
      // Create a new TripleDES object.
      TripleDES^ tripleDESalg = TripleDES::Create();
      
      // Create a CryptoStream using the MemoryStream 
      // and the passed key and initialization vector (IV).
      CryptoStream^ csDecrypt = gcnew CryptoStream( msDecrypt,tripleDESalg->CreateDecryptor( Key, IV ),CryptoStreamMode::Read );
      
      // Create buffer to hold the decrypted data.
      array<Byte>^fromEncrypt = gcnew array<Byte>(Data->Length);
      
      // Read the decrypted data out of the crypto stream
      // and place it into the temporary buffer.
      csDecrypt->Read( fromEncrypt, 0, fromEncrypt->Length );
      
      //Convert the buffer into a string and return it.
      return (gcnew ASCIIEncoding)->GetString( fromEncrypt );
   }
   catch ( CryptographicException^ e ) 
   {
      Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
      return nullptr;
   }

}

int main()
{
   try
   {
      
      // Create a new TripleDES object to generate a key
      // and initialization vector (IV).
      TripleDES^ TripleDESalg = TripleDES::Create();
      
      // Create a string to encrypt.
      String^ sData = "Here is some data to encrypt.";
      
      // Encrypt the string to an in-memory buffer.
      array<Byte>^Data = EncryptTextToMemory( sData, TripleDESalg->Key, TripleDESalg->IV );
      
      // Decrypt the buffer back to a string.
      String^ Final = DecryptTextFromMemory( Data, TripleDESalg->Key, TripleDESalg->IV );
      
      // Display the decrypted string to the console.
      Console::WriteLine( Final );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( e->Message );
   }

}

Imports System.Security.Cryptography
Imports System.Text
Imports System.IO

Module TripleDESPSample

    Sub Main()
        Try
            ' Create a new TripleDES object to generate a key
            ' and initialization vector (IV).
            Using TripleDESalg As TripleDES = TripleDES.Create

                ' Create a string to encrypt.
                Dim sData As String = "Here is some data to encrypt."

                ' Encrypt the string to an in-memory buffer.
                Dim Data As Byte() = EncryptTextToMemory(sData, TripleDESalg.Key, TripleDESalg.IV)

                ' Decrypt the buffer back to a string.
                Dim Final As String = DecryptTextFromMemory(Data, TripleDESalg.Key, TripleDESalg.IV)

                ' Display the decrypted string to the console.
                Console.WriteLine(Final)
            End Using

        Catch e As Exception
            Console.WriteLine(e.Message)
        End Try
    End Sub


    Function EncryptTextToMemory(ByVal Data As String, ByVal Key() As Byte, ByVal IV() As Byte) As Byte()
        Try
            Dim ret As Byte()
            ' Create a MemoryStream.
            Using mStream As New MemoryStream

                ' Create a new TripleDES object.
                Using tripleDESalg As TripleDES = TripleDES.Create

                    ' Create a CryptoStream using the MemoryStream 
                    ' and the passed key and initialization vector (IV).
                    Using cStream As New CryptoStream(mStream, _
                        tripleDESalg.CreateEncryptor(Key, IV), CryptoStreamMode.Write)

                        ' Convert the passed string to a byte array.
                        Dim toEncrypt As Byte() = New ASCIIEncoding().GetBytes(Data)

                        ' Write the byte array to the crypto stream and flush it.
                        cStream.Write(toEncrypt, 0, toEncrypt.Length)
                        cStream.FlushFinalBlock()

                        ' Get an array of bytes from the 
                        ' MemoryStream that holds the 
                        ' encrypted data.
                        ret = mStream.ToArray()
                    End Using
                End Using
            End Using

            ' Return the encrypted buffer.
            Return ret
        Catch e As CryptographicException
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
            Return Nothing
        End Try
    End Function


    Function DecryptTextFromMemory(ByVal Data() As Byte, ByVal Key() As Byte, ByVal IV() As Byte) As String
        Try
            Dim ret As String
            ' Create a new MemoryStream using the passed 
            ' array of encrypted data.
            Using msDecrypt As New MemoryStream(Data)

                ' Create a new TripleDES object.
                Using tripleDESalg As TripleDES = TripleDES.Create

                    ' Create a CryptoStream using the MemoryStream 
                    ' and the passed key and initialization vector (IV).
                    Using csDecrypt As New CryptoStream(msDecrypt, _
                         tripleDESalg.CreateDecryptor(Key, IV), CryptoStreamMode.Read)

                        ' Create buffer to hold the decrypted data.
                        Dim fromEncrypt(Data.Length - 1) As Byte

                        ' Read the decrypted data out of the crypto stream
                        ' and place it into the temporary buffer.
                        csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length)

                        'Convert the buffer into a string and return it.
                        ret = New ASCIIEncoding().GetString(fromEncrypt)
                    End Using
                End Using
            End Using
            Return ret

        Catch e As CryptographicException
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
            Return Nothing
        End Try
    End Function
End Module

Hinweise

Erstellt eine neue Instanz der TripleDES-Klasse.

Siehe auch

Kryptografische Dienste

Gilt für

Create(String)

Erstellt eine Instanz eines Kryptografieobjekts, um die angegebene Implementierung des TripleDES-Algorithmus auszuführen.

public:
 static System::Security::Cryptography::TripleDES ^ Create(System::String ^ str);

public static System.Security.Cryptography.TripleDES? Create (string str);

public static System.Security.Cryptography.TripleDES Create (string str);

static member Create : string -> System.Security.Cryptography.TripleDES

Public Shared Function Create (str As String) As TripleDES

Parameter

str: String

Der Name der spezifischen Implementierung von TripleDES, die verwendet werden soll.

Gibt zurück

TripleDES

Eine Instanz eines Kryptografieobjekts.

Beispiele

Das folgende Codebeispiel zeigt, wie Sie ein -Objekt erstellen und TripleDES verwenden, um Daten in einer Datei zu verschlüsseln und zu entschlüsseln.

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;
using namespace System::IO;
void EncryptTextToFile( String^ Data, String^ FileName, array<Byte>^Key, array<Byte>^IV )
{
   try
   {
      
      // Create or open the specified file.
      FileStream^ fStream = File::Open( FileName, FileMode::OpenOrCreate );
      
      // Create a new TripleDES object.
      TripleDES^ tripleDESalg = TripleDES::Create();
      
      // Create a CryptoStream using the FileStream 
      // and the passed key and initialization vector (IV).
      CryptoStream^ cStream = gcnew CryptoStream( fStream,tripleDESalg->CreateEncryptor( Key, IV ),CryptoStreamMode::Write );
      
      // Create a StreamWriter using the CryptoStream.
      StreamWriter^ sWriter = gcnew StreamWriter( cStream );
      
      // Write the data to the stream 
      // to encrypt it.
      sWriter->WriteLine( Data );
      
      // Close the streams and
      // close the file.
      sWriter->Close();
      cStream->Close();
      fStream->Close();
   }
   catch ( CryptographicException^ e ) 
   {
      Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
   }
   catch ( UnauthorizedAccessException^ e ) 
   {
      Console::WriteLine( "A file error occurred: {0}", e->Message );
   }

}

String^ DecryptTextFromFile( String^ FileName, array<Byte>^Key, array<Byte>^IV )
{
   try
   {
      
      // Create or open the specified file. 
      FileStream^ fStream = File::Open( FileName, FileMode::OpenOrCreate );
      
      // Create a new TripleDES object.
      TripleDES^ tripleDESalg = TripleDES::Create();
      
      // Create a CryptoStream using the FileStream 
      // and the passed key and initialization vector (IV).
      CryptoStream^ cStream = gcnew CryptoStream( fStream,tripleDESalg->CreateDecryptor( Key, IV ),CryptoStreamMode::Read );
      
      // Create a StreamReader using the CryptoStream.
      StreamReader^ sReader = gcnew StreamReader( cStream );
      
      // Read the data from the stream 
      // to decrypt it.
      String^ val = sReader->ReadLine();
      
      // Close the streams and
      // close the file.
      sReader->Close();
      cStream->Close();
      fStream->Close();
      
      // Return the string. 
      return val;
   }
   catch ( CryptographicException^ e ) 
   {
      Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
      return nullptr;
   }
   catch ( UnauthorizedAccessException^ e ) 
   {
      Console::WriteLine( "A file error occurred: {0}", e->Message );
      return nullptr;
   }

}

int main()
{
   try
   {
      
      // Create a new TripleDES object to generate a key 
      // and initialization vector (IV).  Specify one 
      // of the recognized simple names for this 
      // algorithm.
      TripleDES^ TripleDESalg = TripleDES::Create( "TripleDES" );
      
      // Create a string to encrypt.
      String^ sData = "Here is some data to encrypt.";
      String^ FileName = "CText.txt";
      
      // Encrypt text to a file using the file name, key, and IV.
      EncryptTextToFile( sData, FileName, TripleDESalg->Key, TripleDESalg->IV );
      
      // Decrypt the text from a file using the file name, key, and IV.
      String^ Final = DecryptTextFromFile( FileName, TripleDESalg->Key, TripleDESalg->IV );
      
      // Display the decrypted string to the console.
      Console::WriteLine( Final );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( e->Message );
   }

}

using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;

class TripleDESSample
{

    static void Main()
    {
        try
        {
            // Create a new TripleDES object to generate a key
            // and initialization vector (IV).  Specify one
            // of the recognized simple names for this
            // algorithm.
            TripleDES TripleDESalg = TripleDES.Create("TripleDES");

            // Create a string to encrypt.
            string sData = "Here is some data to encrypt.";
            string FileName = "CText.txt";

            // Encrypt text to a file using the file name, key, and IV.
            EncryptTextToFile(sData, FileName, TripleDESalg.Key, TripleDESalg.IV);

            // Decrypt the text from a file using the file name, key, and IV.
            string Final = DecryptTextFromFile(FileName, TripleDESalg.Key, TripleDESalg.IV);

            // Display the decrypted string to the console.
            Console.WriteLine(Final);
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }

    public static void EncryptTextToFile(String Data, String FileName, byte[] Key, byte[] IV)
    {
        try
        {
            // Create or open the specified file.
            FileStream fStream = File.Open(FileName,FileMode.OpenOrCreate);

            // Create a new TripleDES object.
            TripleDES tripleDESalg = TripleDES.Create();

            // Create a CryptoStream using the FileStream
            // and the passed key and initialization vector (IV).
            CryptoStream cStream = new CryptoStream(fStream,
                tripleDESalg.CreateEncryptor(Key,IV),
                CryptoStreamMode.Write);

            // Create a StreamWriter using the CryptoStream.
            StreamWriter sWriter = new StreamWriter(cStream);

            // Write the data to the stream
            // to encrypt it.
            sWriter.WriteLine(Data);

            // Close the streams and
            // close the file.
            sWriter.Close();
            cStream.Close();
            fStream.Close();
        }
        catch(CryptographicException e)
        {
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
        }
        catch(UnauthorizedAccessException  e)
        {
            Console.WriteLine("A file error occurred: {0}", e.Message);
        }
    }

    public static string DecryptTextFromFile(String FileName, byte[] Key, byte[] IV)
    {
        try
        {
            // Create or open the specified file.
            FileStream fStream = File.Open(FileName, FileMode.OpenOrCreate);

            // Create a new TripleDES object.
            TripleDES tripleDESalg = TripleDES.Create();

            // Create a CryptoStream using the FileStream
            // and the passed key and initialization vector (IV).
            CryptoStream cStream = new CryptoStream(fStream,
                tripleDESalg.CreateDecryptor(Key,IV),
                CryptoStreamMode.Read);

            // Create a StreamReader using the CryptoStream.
            StreamReader sReader = new StreamReader(cStream);

            // Read the data from the stream
            // to decrypt it.
            string val = sReader.ReadLine();

            // Close the streams and
            // close the file.
            sReader.Close();
            cStream.Close();
            fStream.Close();

            // Return the string.
            return val;
        }
        catch(CryptographicException e)
        {
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
            return null;
        }
        catch(UnauthorizedAccessException  e)
        {
            Console.WriteLine("A file error occurred: {0}", e.Message);
            return null;
        }
    }
}

Imports System.Security.Cryptography
Imports System.Text
Imports System.IO

Module TripleDESSample

    Sub Main()
        Try
            ' Create a new TripleDES object to generate a key 
            ' and initialization vector (IV).  Specify one 
            ' of the recognized simple names for this 
            ' algorithm.
            Dim TripleDESalg As TripleDES = TripleDES.Create("TripleDES")

            ' Create a string to encrypt.
            Dim sData As String = "Here is some data to encrypt."
            Dim FileName As String = "CText.txt"

            ' Encrypt text to a file using the file name, key, and IV.
            EncryptTextToFile(sData, FileName, TripleDESalg.Key, TripleDESalg.IV)

            ' Decrypt the text from a file using the file name, key, and IV.
            Dim Final As String = DecryptTextFromFile(FileName, TripleDESalg.Key, TripleDESalg.IV)

            ' Display the decrypted string to the console.
            Console.WriteLine(Final)
        Catch e As Exception
            Console.WriteLine(e.Message)
        End Try
    End Sub


    Sub EncryptTextToFile(ByVal Data As String, ByVal FileName As String, ByVal Key() As Byte, ByVal IV() As Byte)
        Try
            ' Create or open the specified file.
            Dim fStream As FileStream = File.Open(FileName, FileMode.OpenOrCreate)

            ' Create a new TripleDES object.
            Dim TripleDESalg As TripleDES = TripleDES.Create

            ' Create a CryptoStream using the FileStream 
            ' and the passed key and initialization vector (IV).
            Dim cStream As New CryptoStream(fStream, _
                                           TripleDESalg.CreateEncryptor(Key, IV), _
                                           CryptoStreamMode.Write)

            ' Create a StreamWriter using the CryptoStream.
            Dim sWriter As New StreamWriter(cStream)

            ' Write the data to the stream 
            ' to encrypt it.
            sWriter.WriteLine(Data)

            ' Close the streams and
            ' close the file.
            sWriter.Close()
            cStream.Close()
            fStream.Close()
        Catch e As CryptographicException
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
        Catch e As UnauthorizedAccessException
            Console.WriteLine("A file error occurred: {0}", e.Message)
        End Try
    End Sub


    Function DecryptTextFromFile(ByVal FileName As String, ByVal Key() As Byte, ByVal IV() As Byte) As String
        Try
            ' Create or open the specified file. 
            Dim fStream As FileStream = File.Open(FileName, FileMode.OpenOrCreate)

            ' Create a new TripleDES object.
            Dim TripleDESalg As TripleDES = TripleDES.Create

            ' Create a CryptoStream using the FileStream 
            ' and the passed key and initialization vector (IV).
            Dim cStream As New CryptoStream(fStream, _
                                            TripleDESalg.CreateDecryptor(Key, IV), _
                                            CryptoStreamMode.Read)

            ' Create a StreamReader using the CryptoStream.
            Dim sReader As New StreamReader(cStream)

            ' Read the data from the stream 
            ' to decrypt it.
            Dim val As String = sReader.ReadLine()

            ' Close the streams and
            ' close the file.
            sReader.Close()
            cStream.Close()
            fStream.Close()

            ' Return the string. 
            Return val
        Catch e As CryptographicException
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
            Return Nothing
        Catch e As UnauthorizedAccessException
            Console.WriteLine("A file error occurred: {0}", e.Message)
            Return Nothing
        End Try
    End Function
End Module

Das folgende Codebeispiel zeigt, wie Sie ein -Objekt erstellen und TripleDES verwenden, um Daten im Arbeitsspeicher zu verschlüsseln und zu entschlüsseln.

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;
using namespace System::IO;
array<Byte>^ EncryptTextToMemory( String^ Data, array<Byte>^Key, array<Byte>^IV )
{
   try
   {
      
      // Create a MemoryStream.
      MemoryStream^ mStream = gcnew MemoryStream;
      
      // Create a new TripleDES object.
      TripleDES^ tripleDESalg = TripleDES::Create();
      
      // Create a CryptoStream using the MemoryStream 
      // and the passed key and initialization vector (IV).
      CryptoStream^ cStream = gcnew CryptoStream( mStream,tripleDESalg->CreateEncryptor( Key, IV ),CryptoStreamMode::Write );
      
      // Convert the passed string to a byte array.
      array<Byte>^toEncrypt = (gcnew ASCIIEncoding)->GetBytes( Data );
      
      // Write the byte array to the crypto stream and flush it.
      cStream->Write( toEncrypt, 0, toEncrypt->Length );
      cStream->FlushFinalBlock();
      
      // Get an array of bytes from the 
      // MemoryStream that holds the 
      // encrypted data.
      array<Byte>^ret = mStream->ToArray();
      
      // Close the streams.
      cStream->Close();
      mStream->Close();
      
      // Return the encrypted buffer.
      return ret;
   }
   catch ( CryptographicException^ e ) 
   {
      Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
      return nullptr;
   }

}

String^ DecryptTextFromMemory( array<Byte>^Data, array<Byte>^Key, array<Byte>^IV )
{
   try
   {
      
      // Create a new MemoryStream using the passed 
      // array of encrypted data.
      MemoryStream^ msDecrypt = gcnew MemoryStream( Data );
      
      // Create a new TripleDES object.
      TripleDES^ tripleDESalg = TripleDES::Create();
      
      // Create a CryptoStream using the MemoryStream 
      // and the passed key and initialization vector (IV).
      CryptoStream^ csDecrypt = gcnew CryptoStream( msDecrypt,tripleDESalg->CreateDecryptor( Key, IV ),CryptoStreamMode::Read );
      
      // Create buffer to hold the decrypted data.
      array<Byte>^fromEncrypt = gcnew array<Byte>(Data->Length);
      
      // Read the decrypted data out of the crypto stream
      // and place it into the temporary buffer.
      csDecrypt->Read( fromEncrypt, 0, fromEncrypt->Length );
      
      //Convert the buffer into a string and return it.
      return (gcnew ASCIIEncoding)->GetString( fromEncrypt );
   }
   catch ( CryptographicException^ e ) 
   {
      Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
      return nullptr;
   }

}

int main()
{
   try
   {
      
      // Create a new TripleDES object to generate a key 
      // and initialization vector (IV).  Specify one 
      // of the recognized simple names for this 
      // algorithm.
      TripleDES^ TripleDESalg = TripleDES::Create( "TripleDES" );
      
      // Create a string to encrypt.
      String^ sData = "Here is some data to encrypt.";
      
      // Encrypt the string to an in-memory buffer.
      array<Byte>^Data = EncryptTextToMemory( sData, TripleDESalg->Key, TripleDESalg->IV );
      
      // Decrypt the buffer back to a string.
      String^ Final = DecryptTextFromMemory( Data, TripleDESalg->Key, TripleDESalg->IV );
      
      // Display the decrypted string to the console.
      Console::WriteLine( Final );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( e->Message );
   }

}

using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;

class TripleDESSample
{
    static void Main()
    {
        try
        {
            // Create a new TripleDES object to generate a key
            // and initialization vector (IV).  Specify one
            // of the recognized simple names for this
            // algorithm.
            TripleDES TripleDESalg = TripleDES.Create("TripleDES");

            // Create a string to encrypt.
            string sData = "Here is some data to encrypt.";

            // Encrypt the string to an in-memory buffer.
            byte[] Data = EncryptTextToMemory(sData, TripleDESalg.Key, TripleDESalg.IV);

            // Decrypt the buffer back to a string.
            string Final = DecryptTextFromMemory(Data, TripleDESalg.Key, TripleDESalg.IV);

            // Display the decrypted string to the console.
            Console.WriteLine(Final);
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }

    public static byte[] EncryptTextToMemory(string Data,  byte[] Key, byte[] IV)
    {
        try
        {
            // Create a MemoryStream.
            MemoryStream mStream = new MemoryStream();

            // Create a new TripleDES object.
            TripleDES tripleDESalg = TripleDES.Create();

            // Create a CryptoStream using the MemoryStream
            // and the passed key and initialization vector (IV).
            CryptoStream cStream = new CryptoStream(mStream,
                tripleDESalg.CreateEncryptor(Key, IV),
                CryptoStreamMode.Write);

            // Convert the passed string to a byte array.
            byte[] toEncrypt = new ASCIIEncoding().GetBytes(Data);

            // Write the byte array to the crypto stream and flush it.
            cStream.Write(toEncrypt, 0, toEncrypt.Length);
            cStream.FlushFinalBlock();

            // Get an array of bytes from the
            // MemoryStream that holds the
            // encrypted data.
            byte[] ret = mStream.ToArray();

            // Close the streams.
            cStream.Close();
            mStream.Close();

            // Return the encrypted buffer.
            return ret;
        }
        catch(CryptographicException e)
        {
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
            return null;
        }
    }

    public static string DecryptTextFromMemory(byte[] Data,  byte[] Key, byte[] IV)
    {
        try
        {
            // Create a new MemoryStream using the passed
            // array of encrypted data.
            MemoryStream msDecrypt = new MemoryStream(Data);

            // Create a new TripleDES object.
            TripleDES tripleDESalg = TripleDES.Create();

            // Create a CryptoStream using the MemoryStream
            // and the passed key and initialization vector (IV).
            CryptoStream csDecrypt = new CryptoStream(msDecrypt,
                tripleDESalg.CreateDecryptor(Key, IV),
                CryptoStreamMode.Read);

            // Create buffer to hold the decrypted data.
            byte[] fromEncrypt = new byte[Data.Length];

            // Read the decrypted data out of the crypto stream
            // and place it into the temporary buffer.
            csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);

            //Convert the buffer into a string and return it.
            return new ASCIIEncoding().GetString(fromEncrypt);
        }
        catch(CryptographicException e)
        {
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
            return null;
        }
    }
}

Imports System.Security.Cryptography
Imports System.Text
Imports System.IO

Module TripleDESPSample

    Sub Main()
        Try
            ' Create a new TripleDES object to generate a key 
            ' and initialization vector (IV).  Specify one 
            ' of the recognized simple names for this 
            ' algorithm.
            Dim TripleDESalg As TripleDES = TripleDES.Create("TripleDES")

            ' Create a string to encrypt.
            Dim sData As String = "Here is some data to encrypt."

            ' Encrypt the string to an in-memory buffer.
            Dim Data As Byte() = EncryptTextToMemory(sData, TripleDESalg.Key, TripleDESalg.IV)

            ' Decrypt the buffer back to a string.
            Dim Final As String = DecryptTextFromMemory(Data, TripleDESalg.Key, TripleDESalg.IV)

            ' Display the decrypted string to the console.
            Console.WriteLine(Final)
        Catch e As Exception
            Console.WriteLine(e.Message)
        End Try
    End Sub


    Function EncryptTextToMemory(ByVal Data As String, ByVal Key() As Byte, ByVal IV() As Byte) As Byte()
        Try
            ' Create a MemoryStream.
            Dim mStream As New MemoryStream

            ' Create a new TripleDES object.
            Dim tripleDESalg As TripleDES = TripleDES.Create

            ' Create a CryptoStream using the MemoryStream 
            ' and the passed key and initialization vector (IV).
            Dim cStream As New CryptoStream(mStream, _
                                            tripleDESalg.CreateEncryptor(Key, IV), _
                                            CryptoStreamMode.Write)

            ' Convert the passed string to a byte array.
            Dim toEncrypt As Byte() = New ASCIIEncoding().GetBytes(Data)

            ' Write the byte array to the crypto stream and flush it.
            cStream.Write(toEncrypt, 0, toEncrypt.Length)
            cStream.FlushFinalBlock()

            ' Get an array of bytes from the 
            ' MemoryStream that holds the 
            ' encrypted data.
            Dim ret As Byte() = mStream.ToArray()

            ' Close the streams.
            cStream.Close()
            mStream.Close()

            ' Return the encrypted buffer.
            Return ret
        Catch e As CryptographicException
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
            Return Nothing
        End Try
    End Function


    Function DecryptTextFromMemory(ByVal Data() As Byte, ByVal Key() As Byte, ByVal IV() As Byte) As String
        Try
            ' Create a new MemoryStream using the passed 
            ' array of encrypted data.
            Dim msDecrypt As New MemoryStream(Data)

            ' Create a new TripleDES object.
            Dim tripleDESalg As TripleDES = TripleDES.Create

            ' Create a CryptoStream using the MemoryStream 
            ' and the passed key and initialization vector (IV).
            Dim csDecrypt As New CryptoStream(msDecrypt, _
                                              tripleDESalg.CreateDecryptor(Key, IV), _
                                              CryptoStreamMode.Read)

            ' Create buffer to hold the decrypted data.
            Dim fromEncrypt(Data.Length - 1) As Byte

            ' Read the decrypted data out of the crypto stream
            ' and place it into the temporary buffer.
            csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length)

            'Convert the buffer into a string and return it.
            Return New ASCIIEncoding().GetString(fromEncrypt)
        Catch e As CryptographicException
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
            Return Nothing
        End Try
    End Function
End Module

Siehe auch

Kryptografische Dienste

Gilt für

TripleDES.Create Methode

Definition

Überlädt

Create()

Gibt zurück

Beispiele

Hinweise

Siehe auch

Gilt für

Create(String)

Parameter

Gibt zurück

Beispiele

Siehe auch

Gilt für

Zusätzliche Ressourcen