AesCryptoServiceProvider AesCryptoServiceProvider AesCryptoServiceProvider AesCryptoServiceProvider Class

Definition

Führt mithilfe der CAPI-Implementierung (Cryptographic Application Programming Interfaces) des AES-Algorithmus (Advanced Encryption Standard) symmetrische Verschlüsselungen und Entschlüsselungen durch.Performs symmetric encryption and decryption using the Cryptographic Application Programming Interfaces (CAPI) implementation of the Advanced Encryption Standard (AES) algorithm.

public ref class AesCryptoServiceProvider sealed : System::Security::Cryptography::Aes
public sealed class AesCryptoServiceProvider : System.Security.Cryptography.Aes
type AesCryptoServiceProvider = class
    inherit Aes
Public NotInheritable Class AesCryptoServiceProvider
Inherits Aes
Vererbung
AesCryptoServiceProviderAesCryptoServiceProviderAesCryptoServiceProviderAesCryptoServiceProvider

Beispiele

Im folgenden Beispiel wird veranschaulicht, wie Beispiel Daten mithilfe der AesCryptoServiceProvider -Klasse verschlüsselt und entschlüsselt werden.The following example demonstrates how to encrypt and decrypt sample data using the AesCryptoServiceProvider class.

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

namespace Aes_Example
{
    class AesExample
    {
        public static void Main()
        {
            string original = "Here is some data to encrypt!";

            // Create a new instance of the AesCryptoServiceProvider
            // class.  This generates a new key and initialization 
            // vector (IV).
            using (AesCryptoServiceProvider myAes = new AesCryptoServiceProvider())
            {
                // Encrypt the string to an array of bytes.
                byte[] encrypted = EncryptStringToBytes_Aes(original, myAes.Key, myAes.IV);

                // Decrypt the bytes to a string.
                string roundtrip = DecryptStringFromBytes_Aes(encrypted, myAes.Key, myAes.IV);

                //Display the original data and the decrypted data.
                Console.WriteLine("Original:   {0}", original);
                Console.WriteLine("Round Trip: {0}", roundtrip);
            }
        }
        static byte[] EncryptStringToBytes_Aes(string plainText, byte[] Key, byte[] IV)
        {
            // Check arguments.
            if (plainText == null || plainText.Length <= 0)
                throw new ArgumentNullException("plainText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");
            byte[] encrypted;
            
            // Create an AesCryptoServiceProvider object
            // with the specified key and IV.
            using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
            {
                aesAlg.Key = Key;
                aesAlg.IV = IV;

                // Create an encryptor to perform the stream transform.
                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

                // Create the streams used for encryption.
                using (MemoryStream msEncrypt = new MemoryStream())
                {
                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                    {
                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                        {
                            //Write all data to the stream.
                            swEncrypt.Write(plainText);
                        }
                        encrypted = msEncrypt.ToArray();
                    }
                }
            }

            // Return the encrypted bytes from the memory stream.
            return encrypted;

        }

        static string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key, byte[] IV)
        {
            // Check arguments.
            if (cipherText == null || cipherText.Length <= 0)
                throw new ArgumentNullException("cipherText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");

            // Declare the string used to hold
            // the decrypted text.
            string plaintext = null;

            // Create an AesCryptoServiceProvider object
            // with the specified key and IV.
            using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
            {
                aesAlg.Key = Key;
                aesAlg.IV = IV;

                // Create a decryptor to perform the stream transform.
                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

                // Create the streams used for decryption.
                using (MemoryStream msDecrypt = new MemoryStream(cipherText))
                {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                    {
                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                        {

                            // Read the decrypted bytes from the decrypting stream
                            // and place them in a string.
                            plaintext = srDecrypt.ReadToEnd();
                        }
                    }
                }

            }

            return plaintext;

        }
    }
}
Imports System.IO
Imports System.Security.Cryptography



Class AesExample

    Public Shared Sub Main()
        Dim original As String = "Here is some data to encrypt!"

        ' Create a new instance of the AesCryptoServiceProvider
        ' class.  This generates a new key and initialization 
        ' vector (IV).
        Using myAes As New AesCryptoServiceProvider()

            ' Encrypt the string to an array of bytes.
            Dim encrypted As Byte() = EncryptStringToBytes_Aes(original, myAes.Key, myAes.IV)

            ' Decrypt the bytes to a string.
            Dim roundtrip As String = DecryptStringFromBytes_Aes(encrypted, myAes.Key, myAes.IV)

            'Display the original data and the decrypted data.
            Console.WriteLine("Original:   {0}", original)
            Console.WriteLine("Round Trip: {0}", roundtrip)
        End Using

    End Sub 'Main

    Shared Function EncryptStringToBytes_Aes(ByVal plainText As String, ByVal Key() As Byte, ByVal IV() As Byte) As Byte() 
        ' Check arguments.
        If plainText Is Nothing OrElse plainText.Length <= 0 Then
            Throw New ArgumentNullException("plainText")
        End If
        If Key Is Nothing OrElse Key.Length <= 0 Then
            Throw New ArgumentNullException("Key")
        End If
        If IV Is Nothing OrElse IV.Length <= 0 Then
            Throw New ArgumentNullException("IV")
        End If
        Dim encrypted() As Byte
        
        ' Create an AesCryptoServiceProvider object
        ' with the specified key and IV.
        Using aesAlg As New AesCryptoServiceProvider()

            aesAlg.Key = Key
            aesAlg.IV = IV

            ' Create an encryptor to perform the stream transform.
            Dim encryptor As ICryptoTransform = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV)

            ' Create the streams used for encryption.
            Dim msEncrypt As New MemoryStream()
            Using csEncrypt As New CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)
                Using swEncrypt As New StreamWriter(csEncrypt)
                    'Write all data to the stream.
                    swEncrypt.Write(plainText)
                End Using
                encrypted = msEncrypt.ToArray()

            End Using
        End Using

        ' Return the encrypted bytes from the memory stream.
        Return encrypted

    End Function 'EncryptStringToBytes_Aes

    Shared Function DecryptStringFromBytes_Aes(ByVal cipherText() As Byte,ByVal Key() As Byte, ByVal IV() As Byte) As String
        ' Check arguments.
        If cipherText Is Nothing OrElse cipherText.Length <= 0 Then
            Throw New ArgumentNullException("cipherText")
        End If
        If Key Is Nothing OrElse Key.Length <= 0 Then
            Throw New ArgumentNullException("Key")
        End If
        If IV Is Nothing OrElse IV.Length <= 0 Then
            Throw New ArgumentNullException("IV")
        End If
        ' Declare the string used to hold
        ' the decrypted text.
        Dim plaintext As String = Nothing

        ' Create an AesCryptoServiceProvider object
        ' with the specified key and IV.
        Using aesAlg As New AesCryptoServiceProvider()

            aesAlg.Key = Key
            aesAlg.IV = IV

            ' Create a decryptor to perform the stream transform.
            Dim decryptor As ICryptoTransform = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV)

            ' Create the streams used for decryption.
            Using msDecrypt As New MemoryStream(cipherText)

                Using csDecrypt As New CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)

                    Using srDecrypt As New StreamReader(csDecrypt)

                        ' Read the decrypted bytes from the decrypting stream
                        ' and place them in a string.
                        plaintext = srDecrypt.ReadToEnd()
                    End Using
                End Using
            End Using
        End Using
        Return plaintext

    End Function 'DecryptStringFromBytes_Aes 
End Class 'AesExample

Konstruktoren

AesCryptoServiceProvider() AesCryptoServiceProvider() AesCryptoServiceProvider() AesCryptoServiceProvider()

Initialisiert eine neue Instanz der AesCryptoServiceProvider-Klasse.Initializes a new instance of the AesCryptoServiceProvider class.

Eigenschaften

BlockSize BlockSize BlockSize BlockSize
FeedbackSize FeedbackSize FeedbackSize FeedbackSize
IV IV IV IV
Key Key Key Key

Ruft den symmetrischen Schlüssel ab, der zur Verschlüsselung und Entschlüsselung verwendet wird, oder legt diesen fest.Gets or sets the symmetric key that is used for encryption and decryption.

KeySize KeySize KeySize KeySize

Ruft die Größe, in Bits, des geheimen Schlüssels ab oder legt diese fest.Gets or sets the size, in bits, of the secret key.

LegalBlockSizes LegalBlockSizes LegalBlockSizes LegalBlockSizes
LegalKeySizes LegalKeySizes LegalKeySizes LegalKeySizes
Mode Mode Mode Mode
Padding Padding Padding Padding

Methoden

Clear() Clear() Clear() Clear()

Gibt alle von der SymmetricAlgorithm-Klasse verwendeten Ressourcen frei.Releases all resources used by the SymmetricAlgorithm class.

(Inherited from SymmetricAlgorithm)
CreateDecryptor() CreateDecryptor() CreateDecryptor() CreateDecryptor()

Erstellt ein symmetrisches AES-Entschlüsselungsobjekt mit dem aktuellen Schlüssel und Initialisierungsvektor (IV).Creates a symmetric AES decryptor object using the current key and initialization vector (IV).

CreateDecryptor(Byte[], Byte[]) CreateDecryptor(Byte[], Byte[]) CreateDecryptor(Byte[], Byte[]) CreateDecryptor(Byte[], Byte[])

Erstellt ein symmetrisches AES-Entschlüsselungsobjekt mit dem angegebenen Schlüssel und Initialisierungsvektor (IV).Creates a symmetric AES decryptor object using the specified key and initialization vector (IV).

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

Erstellt ein symmetrisches AES-Verschlüsselungsobjekt mit dem aktuellen Schlüssel und Initialisierungsvektor (IV).Creates a symmetric AES encryptor object using the current key and initialization vector (IV).

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

Erstellt ein symmetrisches Verschlüsselungsobjekt mit dem angegebenen Schlüssel und Initialisierungsvektor (IV).Creates a symmetric encryptor object using the specified key and initialization vector (IV).

Dispose() Dispose() Dispose() Dispose()

Gibt alle von der aktuellen Instanz der SymmetricAlgorithm-Klasse verwendeten Ressourcen frei.Releases all resources used by the current instance of the SymmetricAlgorithm class.

(Inherited from SymmetricAlgorithm)
Dispose(Boolean) Dispose(Boolean) Dispose(Boolean) Dispose(Boolean)

Gibt die von SymmetricAlgorithm verwendeten nicht verwalteten Ressourcen und optional die verwalteten Ressourcen frei.Releases the unmanaged resources used by the SymmetricAlgorithm and optionally releases the managed resources.

(Inherited from SymmetricAlgorithm)
Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Bestimmt, ob das angegebene Objekt mit dem aktuellen Objekt identisch ist.Determines whether the specified object is equal to the current object.

(Inherited from Object)
GenerateIV() GenerateIV() GenerateIV() GenerateIV()

Generiert einen zufälligen Initialisierungsvektor (IV) für den Algorithmus.Generates a random initialization vector (IV) to use for the algorithm.

GenerateKey() GenerateKey() GenerateKey() GenerateKey()

Generiert einen zufälligen Schlüssel für den Algorithmus.Generates a random key to use for the algorithm.

GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Fungiert als Standardhashfunktion.Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Ruft den Type der aktuellen Instanz ab.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Erstellt eine flache Kopie des aktuellen Object.Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

Gibt eine Zeichenfolge zurück, die das aktuelle Objekt darstellt.Returns a string that represents the current object.

(Inherited from Object)
ValidKeySize(Int32) ValidKeySize(Int32) ValidKeySize(Int32) ValidKeySize(Int32)

Bestimmt, ob die angegebene Schlüsselgröße für den aktuellen Algorithmus gültig ist.Determines whether the specified key size is valid for the current algorithm.

(Inherited from SymmetricAlgorithm)

Felder

BlockSizeValue BlockSizeValue BlockSizeValue BlockSizeValue

Stellt die Blockgröße des kryptografischen Vorgangs in Bits dar.Represents the block size, in bits, of the cryptographic operation.

(Inherited from SymmetricAlgorithm)
FeedbackSizeValue FeedbackSizeValue FeedbackSizeValue FeedbackSizeValue

Stellt die Feedbackgröße des kryptografischen Vorgangs in Bits dar.Represents the feedback size, in bits, of the cryptographic operation.

(Inherited from SymmetricAlgorithm)
IVValue IVValue IVValue IVValue

Stellt den Initialisierungsvektor (IV) für den symmetrischen Algorithmus dar.Represents the initialization vector (IV) for the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
KeySizeValue KeySizeValue KeySizeValue KeySizeValue

Stellt die Größe des vom symmetrischen Algorithmus verwendeten geheimen Schlüssels in Bits dar.Represents the size, in bits, of the secret key used by the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
KeyValue KeyValue KeyValue KeyValue

Stellt den geheimen Schlüssel für den symmetrischen Algorithmus dar.Represents the secret key for the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
LegalBlockSizesValue LegalBlockSizesValue LegalBlockSizesValue LegalBlockSizesValue

Gibt die vom symmetrischen Algorithmus unterstützten Blockgrößen in Bits an.Specifies the block sizes, in bits, that are supported by the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
LegalKeySizesValue LegalKeySizesValue LegalKeySizesValue LegalKeySizesValue

Gibt die vom symmetrischen Algorithmus unterstützten Schlüsselgrößen in Bits an.Specifies the key sizes, in bits, that are supported by the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
ModeValue ModeValue ModeValue ModeValue

Stellt den im symmetrischen Algorithmus verwendeten Verschlüsselungsmodus dar.Represents the cipher mode used in the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
PaddingValue PaddingValue PaddingValue PaddingValue

Stellt den im symmetrischen Algorithmus verwendeten Füllzeichenmodus dar.Represents the padding mode used in the symmetric algorithm.

(Inherited from SymmetricAlgorithm)

Explizite Schnittstellenimplementierungen

IDisposable.Dispose() IDisposable.Dispose() IDisposable.Dispose() IDisposable.Dispose()

Gibt die von SymmetricAlgorithm verwendeten nicht verwalteten Ressourcen und optional die verwalteten Ressourcen frei.Releases the unmanaged resources used by the SymmetricAlgorithm and optionally releases the managed resources.

(Inherited from SymmetricAlgorithm)

Gilt für: