AesManaged Klasse

Definition

Stellt eine verwaltete Implementierung des symmetrischen AES (Advanced Encryption Standard)-Algorithmus bereit.Provides a managed implementation of the Advanced Encryption Standard (AES) symmetric algorithm.

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

Beispiele

Im folgenden Beispiel wird veranschaulicht, wie Beispiel Daten mit der AesManaged-Klasse verschlüsselt und entschlüsselt werden.The following example demonstrates how to encrypt and decrypt sample data using the AesManaged 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 AesManaged
            // class.  This generates a new key and initialization 
            // vector (IV).
            using (AesManaged myAes = new AesManaged())
            {
                // 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 AesManaged object
            // with the specified key and IV.
            using (AesManaged aesAlg = new AesManaged())
            {
                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 AesManaged object
            // with the specified key and IV.
            using (AesManaged aesAlg = new AesManaged())
            {
                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 AesManaged
        ' class.  This generates a new key and initialization 
        ' vector (IV).
        Using myAes As New AesManaged()
            ' 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 AesManaged object
        ' with the specified key and IV.
        Using aesAlg As New AesManaged()

            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 AesManaged object
        ' with the specified key and IV.
        Using aesAlg As New AesManaged
            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 AesManaged object
    // with the specified key and IV.
    use aesAlg = new AesManaged()
    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 AesManaged object
    // with the specified key and IV.
    use aesAlg = new AesManaged()
    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 AesManaged
    // class.  This generates a new key and initialization 
    // vector (IV).
    use myAes = new AesManaged()

    // 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

Hinweise

Beim AES-Algorithmus handelt es sich im Wesentlichen um den symmetrischen Rijndael-Algorithmus mit fester Blockgröße und Iterations Anzahl.The AES algorithm is essentially the Rijndael symmetric algorithm with a fixed block size and iteration count. Diese Klasse funktioniert genauso wie die RijndaelManaged-Klasse, schränkt jedoch Blöcke auf 128 Bits ein und lässt keine Feedback Modi zu.This class functions the same way as the RijndaelManaged class but limits blocks to 128 bits and does not allow feedback modes.

Hinweis

Wenn die Windows-Sicherheitsrichtlinien Einstellung für mit der Federal Information Processing Standards (fps) kompatible Algorithmen aktiviert ist, löst die Verwendung dieses Algorithmus eine CryptographicExceptionaus.If the Windows security policy setting for Federal Information Processing Standards (FIPS)-compliant algorithms is enabled, using this algorithm throws a CryptographicException.

Konstruktoren

AesManaged()

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

FeedbackSize

Ruft die Anzahl der Bits ab, die als Feedback verwendet werden, oder legt diese fest.Gets or sets the number of bits to use as feedback.

IV

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

Key

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

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 for the symmetric algorithm.

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.

Padding

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

Methoden

Clear()

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

(Geerbt von SymmetricAlgorithm)
CreateDecryptor()

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

CreateDecryptor(Byte[], Byte[])

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

CreateEncryptor()

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

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()

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)

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.

(Geerbt von SymmetricAlgorithm)
Equals(Object)

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

(Geerbt von Object)
GenerateIV()

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

GenerateKey()

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

GetHashCode()

Fungiert als Standardhashfunktion.Serves 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()

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.

(Geerbt von SymmetricAlgorithm)

Gilt für: