TripleDESCryptoServiceProvider.CreateEncryptor TripleDESCryptoServiceProvider.CreateEncryptor TripleDESCryptoServiceProvider.CreateEncryptor TripleDESCryptoServiceProvider.CreateEncryptor Method

Definice

Vytvoří symetrický objekt šifrování.Creates a symmetric encryptor object.

Přetížení

CreateEncryptor() CreateEncryptor() CreateEncryptor() CreateEncryptor()
CreateEncryptor(Byte[], Byte[]) CreateEncryptor(Byte[], Byte[]) CreateEncryptor(Byte[], Byte[]) CreateEncryptor(Byte[], Byte[])

Vytvoří symetrický TripleDES objekt šifry se zadaným klíčem (Key) a inicializačním vektoremIV().Creates a symmetric TripleDES encryptor object with the specified key (Key) and initialization vector (IV).

CreateEncryptor() CreateEncryptor() CreateEncryptor() CreateEncryptor()

public:
 override System::Security::Cryptography::ICryptoTransform ^ CreateEncryptor();
public override System.Security.Cryptography.ICryptoTransform CreateEncryptor ();
override this.CreateEncryptor : unit -> System.Security.Cryptography.ICryptoTransform
Public Overrides Function CreateEncryptor () As ICryptoTransform

Návraty

CreateEncryptor(Byte[], Byte[]) CreateEncryptor(Byte[], Byte[]) CreateEncryptor(Byte[], Byte[]) CreateEncryptor(Byte[], Byte[])

Vytvoří symetrický TripleDES objekt šifry se zadaným klíčem (Key) a inicializačním vektoremIV().Creates a symmetric TripleDES encryptor object with the specified key (Key) and initialization vector (IV).

public:
 override System::Security::Cryptography::ICryptoTransform ^ CreateEncryptor(cli::array <System::Byte> ^ rgbKey, cli::array <System::Byte> ^ rgbIV);
public override System.Security.Cryptography.ICryptoTransform CreateEncryptor (byte[] rgbKey, byte[] rgbIV);
override this.CreateEncryptor : byte[] * byte[] -> System.Security.Cryptography.ICryptoTransform
Public Overrides Function CreateEncryptor (rgbKey As Byte(), rgbIV As Byte()) As ICryptoTransform

Parametry

rgbKey
Byte[]

Tajný klíč, který se má použít pro symetrický algoritmus.The secret key to use for the symmetric algorithm.

rgbIV
Byte[]

Inicializační vektor, který se má použít pro symetrický algoritmus.The initialization vector to use for the symmetric algorithm.

Inicializační vektor musí mít délku 8 bajtů.The initialization vector must be 8 bytes long. Pokud je delší než 8 bajtů, je zkrácen a výjimka není vyvolána.If it is longer than 8 bytes, it is truncated and an exception is not thrown. Před voláním CreateEncryptor(Byte[], Byte[])je třeba ověřit délku inicializačního vektoru a vyvolat výjimku, pokud je příliš dlouhá.Before you call CreateEncryptor(Byte[], Byte[]), check the length of the initialization vector and throw an exception if it is too long.

Návraty

Symetrický TripleDES objekt šifrování.A symmetric TripleDES encryptor object.

Výjimky

Hodnota Mode vlastnosti je OFB.The value of the Mode property is OFB.

-nebo--or- Hodnota Mode vlastnosti CFB jeFeedbackSize a hodnota vlastnosti není 8.The value of the Mode property is CFB and the value of the FeedbackSize property is not 8.

-nebo--or- Byla použita neplatná velikost klíče.An invalid key size was used.

-nebo--or- Velikost klíče algoritmu nebyla k dispozici.The algorithm key size was not available.

Příklady

Následující příklad kódu vytvoří TripleDESCryptoServiceProvider objekt a použije ho k šifrování a dešifrování dat v souboru.The following code example creates a TripleDESCryptoServiceProvider object and uses it to encrypt and decrypt data in a file.

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 CryptoStream using the FileStream 
      // and the passed key and initialization vector (IV).
      CryptoStream^ cStream = gcnew CryptoStream( fStream,(gcnew TripleDESCryptoServiceProvider)->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 CryptoStream using the FileStream 
      // and the passed key and initialization vector (IV).
      CryptoStream^ cStream = gcnew CryptoStream( fStream,(gcnew TripleDESCryptoServiceProvider)->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 TripleDESCryptoServiceProvider object
      // to generate a key and initialization vector (IV).
      TripleDESCryptoServiceProvider^ tDESalg = gcnew TripleDESCryptoServiceProvider;
      
      // 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, tDESalg->Key, tDESalg->IV );
      
      // Decrypt the text from a file using the file name, key, and IV.
      String^ Final = DecryptTextFromFile( FileName, tDESalg->Key, tDESalg->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 TrippleDESCSPSample
{

    static void Main()
    {
        try
        {
            // Create a new TripleDESCryptoServiceProvider object
            // to generate a key and initialization vector (IV).
            TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider();

            // 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, tDESalg.Key, tDESalg.IV);

            // Decrypt the text from a file using the file name, key, and IV.
            string Final = DecryptTextFromFile(FileName, tDESalg.Key, tDESalg.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 CryptoStream using the FileStream 
            // and the passed key and initialization vector (IV).
            CryptoStream cStream = new CryptoStream(fStream, 
                new TripleDESCryptoServiceProvider().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 access 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 CryptoStream using the FileStream 
            // and the passed key and initialization vector (IV).
            CryptoStream cStream = new CryptoStream(fStream, 
                new TripleDESCryptoServiceProvider().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 access error occurred: {0}", e.Message);
            return null;
        }
    }
}
Imports System.Security.Cryptography
Imports System.Text
Imports System.IO

Module TrippleDESCSPSample

    Sub Main()
        Try
            ' Create a new TripleDESCryptoServiceProvider object
            ' to generate a key and initialization vector (IV).
            Dim tDESalg As New TripleDESCryptoServiceProvider

            ' 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, tDESalg.Key, tDESalg.IV)

            ' Decrypt the text from a file using the file name, key, and IV.
            Dim Final As String = DecryptTextFromFile(FileName, tDESalg.Key, tDESalg.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 CryptoStream using the FileStream 
            ' and the passed key and initialization vector (IV).
            Dim cStream As New CryptoStream(fStream, _
                                            New TripleDESCryptoServiceProvider().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 CryptoStream using the FileStream 
            ' and the passed key and initialization vector (IV).
            Dim cStream As New CryptoStream(fStream, _
                                            New TripleDESCryptoServiceProvider().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

Následující příklad kódu vytvoří TripleDESCryptoServiceProvider objekt a použije ho k šifrování a dešifrování dat v paměti.The following code example creates a TripleDESCryptoServiceProvider object and uses it to encrypt and decrypt data in memory.

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 CryptoStream using the MemoryStream 
      // and the passed key and initialization vector (IV).
      CryptoStream^ cStream = gcnew CryptoStream( mStream,(gcnew TripleDESCryptoServiceProvider)->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 CryptoStream using the MemoryStream 
      // and the passed key and initialization vector (IV).
      CryptoStream^ csDecrypt = gcnew CryptoStream( msDecrypt,(gcnew TripleDESCryptoServiceProvider)->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 TripleDESCryptoServiceProvider object
      // to generate a key and initialization vector (IV).
      TripleDESCryptoServiceProvider^ tDESalg = gcnew TripleDESCryptoServiceProvider;
      
      // 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, tDESalg->Key, tDESalg->IV );
      
      // Decrypt the buffer back to a string.
      String^ Final = DecryptTextFromMemory( Data, tDESalg->Key, tDESalg->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 TrippleDESCSPSample
{

    static void Main()
    {
        try
        {
            // Create a new TripleDESCryptoServiceProvider object
            // to generate a key and initialization vector (IV).
            TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider();

            // 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, tDESalg.Key, tDESalg.IV);

            // Decrypt the buffer back to a string.
            string Final = DecryptTextFromMemory(Data, tDESalg.Key, tDESalg.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 CryptoStream using the MemoryStream 
            // and the passed key and initialization vector (IV).
            CryptoStream cStream = new CryptoStream(mStream, 
                new TripleDESCryptoServiceProvider().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 CryptoStream using the MemoryStream 
            // and the passed key and initialization vector (IV).
            CryptoStream csDecrypt = new CryptoStream(msDecrypt, 
                new TripleDESCryptoServiceProvider().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 TrippleDESCSPSample

    Sub Main()
        Try
            ' Create a new TripleDESCryptoServiceProvider object
            ' to generate a key and initialization vector (IV).
            Dim tDESalg As New TripleDESCryptoServiceProvider

            ' 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, tDESalg.Key, tDESalg.IV)

            ' Decrypt the buffer back to a string.
            Dim Final As String = DecryptTextFromMemory(Data, tDESalg.Key, tDESalg.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 CryptoStream using the MemoryStream 
            ' and the passed key and initialization vector (IV).
            Dim cStream As New CryptoStream(mStream, _
                                            New TripleDESCryptoServiceProvider().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 CryptoStream using the MemoryStream 
            ' and the passed key and initialization vector (IV).
            Dim csDecrypt As New CryptoStream(msDecrypt, _
                                              New TripleDESCryptoServiceProvider().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

Poznámky

K dešifrování výsledku této metody použijte přetíženísestejnýmiparametry.CreateDecryptorUse the CreateDecryptor overload with the same parameters to decrypt the result of this method.

Viz také

Platí pro