DESCryptoServiceProvider.CreateEncryptor Methode

Definitie

Naamruimte:
System.Security.Cryptography
Assembly's:
netstandard.dll, System.Security.Cryptography.dll
Assembly's:
netstandard.dll, System.Security.Cryptography.Csp.dll
Assembly's:
netstandard.dll, System.Security.Cryptography.dll, System.Security.Cryptography.Csp.dll
Assembly:
System.Security.Cryptography.Csp.dll
Assembly:
netstandard.dll
Assembly:
mscorlib.dll

Hiermee maakt u een symmetrisch encryptorobject.

Overloads

Name Description
CreateEncryptor()

Hiermee maakt u een symmetrisch encryptorobject met de huidige Key eigenschap en initialisatievector (IV).
CreateEncryptor(Byte[], Byte[])

Hiermee maakt u een symmetrisch versleutelingsstandaard (DES) versleutelingsobject met de opgegeven sleutel (Key) en initialisatievector (IV).

CreateEncryptor()

Bron:
DESCryptoServiceProvider.Unix.cs
Bron:
DESCryptoServiceProvider.Unix.cs
Bron:
DESCryptoServiceProvider.Unix.cs
Bron:
DESCryptoServiceProvider.Unix.cs
Bron:
DESCryptoServiceProvider.Unix.cs

Hiermee maakt u een symmetrisch encryptorobject met de huidige Key eigenschap en initialisatievector (IV).

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

Retouren

ICryptoTransform

Een symmetrisch encryptorobject.

Opmerkingen

Als de huidige Key eigenschap is null, wordt de GenerateKey methode aangeroepen om een nieuwe willekeurige te Keymaken. Als de huidige IV eigenschap is null, wordt de GenerateIV methode aangeroepen om een nieuwe willekeurige te IVmaken.

Gebruik de CreateDecryptor overbelasting met dezelfde handtekening om het resultaat van deze methode te ontsleutelen.

Van toepassing op

CreateEncryptor(Byte[], Byte[])

Bron:
DESCryptoServiceProvider.Unix.cs
Bron:
DESCryptoServiceProvider.Unix.cs
Bron:
DESCryptoServiceProvider.Unix.cs
Bron:
DESCryptoServiceProvider.Unix.cs
Bron:
DESCryptoServiceProvider.Unix.cs

Hiermee maakt u een symmetrisch versleutelingsstandaard (DES) versleutelingsobject met de opgegeven sleutel (Key) en initialisatievector (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);
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

Parameters

rgbKey
Byte[]

De geheime sleutel die moet worden gebruikt voor het symmetrische algoritme.

rgbIV
Byte[]

De initialisatievector die moet worden gebruikt voor het symmetrische algoritme.

Retouren

ICryptoTransform

Een symmetrisch DES encryptorobject.

Uitzonderingen

CryptographicException

De waarde van de Mode eigenschap is OFB.

– of –

De waarde van de Mode eigenschap is CFB en de waarde van de FeedbackSize eigenschap is niet 8.

– of –

Er is een ongeldige sleutelgrootte gebruikt.

– of –

De grootte van de algoritmesleutel is niet beschikbaar.

Voorbeelden

In het volgende codevoorbeeld ziet u hoe u een DESCryptoServiceProvider object maakt en gebruikt om gegevens in een bestand te versleutelen en ontsleutelen.

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

class DESCSPSample
{

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

            // 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, DESalg.Key, DESalg.IV);

            // Decrypt the text from a file using the file name, key, and IV.
            string Final = DecryptTextFromFile(FileName, DESalg.Key, DESalg.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 DESCryptoServiceProvider().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 CryptoStream using the FileStream
            // and the passed key and initialization vector (IV).
            CryptoStream cStream = new CryptoStream(fStream,
                new DESCryptoServiceProvider().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 DESCSPSample

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

            ' 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, DESalg.Key, DESalg.IV)

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

In het volgende codevoorbeeld ziet u hoe u een DESCryptoServiceProvider object maakt en gebruikt om gegevens in het geheugen te versleutelen en ontsleutelen.

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

class DESCSPSample
{
    static void Main()
    {
        try
        {
            // Create a new DESCryptoServiceProvider object
            // to generate a key and initialization vector (IV).
            DESCryptoServiceProvider DESalg = new DESCryptoServiceProvider();

            // 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, DESalg.Key, DESalg.IV);

            // Decrypt the buffer back to a string.
            string Final = DecryptTextFromMemory(Data, DESalg.Key, DESalg.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 DESCryptoServiceProvider().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 DESCryptoServiceProvider().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 DESCSPSample

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

            ' 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, DESalg.Key, DESalg.IV)

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

Opmerkingen

Gebruik de CreateDecryptor overbelasting met dezelfde parameters om het resultaat van deze methode te ontsleutelen.

Zie ook

Van toepassing op