Aes Klasse

Definition

Stellt die abstrakte Basisklasse dar, von der alle Implementierungen von Advanced Encryption Standard (AES) erben müssen.Represents the abstract base class from which all implementations of the Advanced Encryption Standard (AES) must inherit.

public ref class Aes abstract : System::Security::Cryptography::SymmetricAlgorithm
public abstract class Aes : System.Security.Cryptography.SymmetricAlgorithm
type Aes = class
    inherit SymmetricAlgorithm
Public MustInherit Class Aes
Inherits SymmetricAlgorithm
Vererbung
Abgeleitet

Beispiele

Im folgenden Beispiel wird veranschaulicht, wie Beispiel Daten mit der Aes-Klasse verschlüsselt und entschlüsselt werden.The following example demonstrates how to encrypt and decrypt sample data by using the Aes 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 Aes
            // class.  This generates a new key and initialization 
            // vector (IV).
            using (Aes myAes = Aes.Create())
            {

                // 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 Aes object
            // with the specified key and IV.
            using (Aes aesAlg = Aes.Create())
            {
                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 Aes object
            // with the specified key and IV.
            using (Aes aesAlg = Aes.Create())
            {
                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 Aes
        ' class.  This generates a new key and initialization 
        ' vector (IV).
        Using myAes As Aes = Aes.Create()
            ' 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

    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 Aes object
        ' with the specified key and IV.
        Using aesAlg As Aes = Aes.Create()

            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.
            Using 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
        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 Aes object
        ' with the specified key and IV.
        Using aesAlg As Aes = Aes.Create()
            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
open System
open System.IO
open System.Security.Cryptography

let encryptStringToBytes_Aes (plainText: string, key : byte[], iv : byte[]) : byte[] =

    // Check arguments.
    if (isNull plainText || plainText.Length <= 0) then nullArg "plainText"
    if (isNull key || key.Length <= 0) then nullArg "key"
    if (isNull iv || iv.Length <= 0) then nullArg "iv"
    
    // Create an Aes object
    // with the specified key and IV.
    use aesAlg = Aes.Create()
    aesAlg.Key <- key
    aesAlg.IV <- iv

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

    // Create the streams used for encryption.
    use msEncrypt = new MemoryStream()
    use csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)
    use swEncrypt = new StreamWriter(csEncrypt)
    
    //Write all data to the stream.
    swEncrypt.Write(plainText)
    swEncrypt.Flush()
    
    // Return the encrypted bytes from the memory stream.
    msEncrypt.ToArray()

let decryptStringFromBytes_Aes (cipherText : byte[], key : byte[], iv : byte[]) : string =

    // Check arguments.
    if (isNull cipherText || cipherText.Length <= 0) then nullArg "cipherText"
    if (isNull key || key.Length <= 0) then nullArg "key"
    if (isNull iv || iv.Length <= 0) then nullArg "iv"

    // Create an Aes object
    // with the specified key and IV.
    use aesAlg = Aes.Create()
    aesAlg.Key <- key
    aesAlg.IV <- iv

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

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

    // Read the decrypted bytes from the decrypting stream
    // and return the resulting string.
    srDecrypt.ReadToEnd()

[<EntryPoint>]
let main argv = 

    let original = "Here is some data to encrypt!"

    // Create a new instance of the Aes
    // class.  This generates a new key and initialization 
    // vector (IV).
    use myAes = Aes.Create()

    // Encrypt the string to an array of bytes.
    let encrypted = encryptStringToBytes_Aes(original, myAes.Key, myAes.IV)

    // Decrypt the bytes to a string.
    let 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)
    0

Konstruktoren

Aes()

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

Felder

BlockSizeValue

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

(Geerbt von SymmetricAlgorithm)
FeedbackSizeValue

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

(Geerbt von SymmetricAlgorithm)
IVValue

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

(Geerbt von SymmetricAlgorithm)
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.

(Geerbt von SymmetricAlgorithm)
KeyValue

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

(Geerbt von SymmetricAlgorithm)
LegalBlockSizesValue

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

(Geerbt von SymmetricAlgorithm)
LegalKeySizesValue

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

(Geerbt von SymmetricAlgorithm)
ModeValue

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

(Geerbt von SymmetricAlgorithm)
PaddingValue

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

(Geerbt von SymmetricAlgorithm)

Eigenschaften

BlockSize

Ruft die Blockgröße des kryptografischen Vorgangs in Bits ab oder legt diese fest.Gets or sets the block size, in bits, of the cryptographic operation.

(Geerbt von SymmetricAlgorithm)
FeedbackSize

Ruft die Feedbackgröße des kryptografischen Vorgangs für den CFB-Modus (Cipher Feedback, Verschlüsselungsverfahren-Feedback) und den OFB-Modus (Output Feedback, Ausgabefeedback) in Bits ab oder legt diese fest.Gets or sets the feedback size, in bits, of the cryptographic operation for the Cipher Feedback (CFB) and Output Feedback (OFB) cipher modes.

(Geerbt von SymmetricAlgorithm)
IV

Ruft den Initialisierungsvektor (IV) für den symmetrischen Algorithmus ab oder legt diesen fest.Gets or sets the initialization vector (IV) for the symmetric algorithm.

(Geerbt von SymmetricAlgorithm)
Key

Ruft den geheimen Schlüssel für den symmetrischen Algorithmus ab oder legt diesen fest.Gets or sets the secret key for the symmetric algorithm.

(Geerbt von SymmetricAlgorithm)
KeySize

Ruft die Größe des geheimen Schlüssels für den symmetrischen Algorithmus in Bits ab oder legt diese fest.Gets or sets the size, in bits, of the secret key used by the symmetric algorithm.

(Geerbt von SymmetricAlgorithm)
LegalBlockSizes

Ruft die vom symmetrischen Algorithmus unterstützten Blockgrößen in Bits ab.Gets the block sizes, in bits, that are supported by the symmetric algorithm.

LegalKeySizes

Ruft die vom symmetrischen Algorithmus unterstützten Schlüsselgrößen in Bits ab.Gets the key sizes, in bits, that are supported by the symmetric algorithm.

Mode

Ruft den Modus für die Ausführung des symmetrischen Algorithmus ab oder legt diesen fest.Gets or sets the mode for operation of the symmetric algorithm.

(Geerbt von SymmetricAlgorithm)
Padding

Ruft den im symmetrischen Algorithmus verwendeten Füllzeichenmodus ab oder legt diesen fest.Gets or sets the padding mode used in the symmetric algorithm.

(Geerbt von SymmetricAlgorithm)

Methoden

Clear()

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

(Geerbt von SymmetricAlgorithm)
Create()

Erstellt ein Kryptografieobjekt zum Ausführen des symmetrischen Algorithmus.Creates a cryptographic object that is used to perform the symmetric algorithm.

Create(String)

Erstellt unter Angabe der AES-Implementierung ein Kryptografieobjekt zum Ausführen des symmetrischen Algorithmus.Creates a cryptographic object that specifies the implementation of AES to use to perform the symmetric algorithm.

CreateDecryptor()

Erstellt ein symmetrisches Entschlüsselungsobjekt mit der aktuellen Key-Eigenschaft und dem Initialisierungsvektor (IV).Creates a symmetric decryptor object with the current Key property and initialization vector (IV).

(Geerbt von SymmetricAlgorithm)
CreateDecryptor(Byte[], Byte[])

Erstellt beim Überschreiben in einer abgeleiteten Klasse ein symmetrisches Entschlüsselungsobjekt mit der angegebenen Key-Eigenschaft und dem angegebenen Initialisierungsvektor (IV).When overridden in a derived class, creates a symmetric decryptor object with the specified Key property and initialization vector (IV).

(Geerbt von SymmetricAlgorithm)
CreateEncryptor()

Erstellt ein symmetrisches Verschlüsselungsobjekt mit der aktuellen Key-Eigenschaft und dem aktuellen Initialisierungsvektor (IV).Creates a symmetric encryptor object with the current Key property and initialization vector (IV).

(Geerbt von SymmetricAlgorithm)
CreateEncryptor(Byte[], Byte[])

Erstellt beim Überschreiben in einer abgeleiteten Klasse ein symmetrisches Verschlüsselungsobjekt mit der angegebenen Key-Eigenschaft und dem angegebenen Initialisierungsvektor (IV).When overridden in a derived class, creates a symmetric encryptor object with the specified Key property and initialization vector (IV).

(Geerbt von SymmetricAlgorithm)
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.

(Geerbt von SymmetricAlgorithm)
Dispose(Boolean)

Veröffentlicht die durch den SymmetricAlgorithm verwendeten nicht verwalteten Ressourcen und nimmt eine optionale Veröffentlichung der verwalteten Ressourcen vor.Releases the unmanaged resources used by the SymmetricAlgorithm and optionally releases the managed resources.

(Geerbt von SymmetricAlgorithm)
Equals(Object)

Ermittelt, ob das angegebene Objekt und das aktuelle Objekt gleich sind.Determines whether the specified object is equal to the current object.

(Geerbt von Object)
GenerateIV()

Generiert beim Überschreiben in einer abgeleiteten Klasse einen zufälligen Initialisierungsvektor (IV) für den Algorithmus.When overridden in a derived class, generates a random initialization vector (IV) to use for the algorithm.

(Geerbt von SymmetricAlgorithm)
GenerateKey()

Generiert beim Überschreiben in einer abgeleiteten Klasse einen zufälligen Schlüssel (Key) für den Algorithmus.When overridden in a derived class, generates a random key (Key) to use for the algorithm.

(Geerbt von SymmetricAlgorithm)
GetHashCode()

Dient als die Standard-HashfunktionServes as the default hash function.

(Geerbt von Object)
GetType()

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

(Geerbt von Object)
MemberwiseClone()

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

(Geerbt von Object)
ToString()

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

(Geerbt von Object)
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.

(Geerbt von SymmetricAlgorithm)

Explizite Schnittstellenimplementierungen

IDisposable.Dispose()

Veröffentlicht die durch den SymmetricAlgorithm verwendeten nicht verwalteten Ressourcen und nimmt eine optionale Veröffentlichung der verwalteten Ressourcen vor.Releases the unmanaged resources used by the SymmetricAlgorithm and optionally releases the managed resources.

(Geerbt von SymmetricAlgorithm)

Gilt für: