AesManaged AesManaged AesManaged AesManaged Class

Définition

Fournit une implémentation managée de l'algorithme symétrique AES (Advanced Encryption Standard).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
Héritage

Exemples

L’exemple suivant montre comment chiffrer et déchiffrer les données d’exemple à l’aide la AesManaged classe.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 '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 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 'AesExample

Remarques

L’algorithme AES est essentiellement l’algorithme symétrique Rijndael avec un nombre d’itération et de taille de bloc fixe.The AES algorithm is essentially the Rijndael symmetric algorithm with a fixed block size and iteration count. Cette classe fonctionne de la même façon que le RijndaelManaged classe mais limite les blocs à 128 bits et n’autorise pas les modes de commentaires.This class functions the same way as the RijndaelManaged class but limits blocks to 128 bits and does not allow feedback modes.

Note

Si le paramètre de stratégie de sécurité Windows pour FIPS Federal Information Processing Standards ()-des algorithmes compatibles est activé, à l’aide de cet algorithme lève un CryptographicException.If the Windows security policy setting for Federal Information Processing Standards (FIPS)-compliant algorithms is enabled, using this algorithm throws a CryptographicException.

Constructeurs

AesManaged() AesManaged() AesManaged() AesManaged()

Initialise une nouvelle instance de la classe AesManaged.Initializes a new instance of the AesManaged class.

Propriétés

BlockSize BlockSize BlockSize BlockSize
FeedbackSize FeedbackSize FeedbackSize FeedbackSize

Obtient ou définit le nombre de bits à utiliser en commentaires.Gets or sets the number of bits to use as feedback.

IV IV IV IV

Obtient ou définit le vecteur d'initialisation à utiliser pour l'algorithme symétrique.Gets or sets the initialization vector (IV) to use for the symmetric algorithm.

Key Key Key Key

Obtient ou définit la clé secrète utilisée pour l'algorithme symétrique.Gets or sets the secret key used for the symmetric algorithm.

KeySize KeySize KeySize KeySize

Obtient ou définit la taille, en bits, de la clé secrète utilisée pour l'algorithme symétrique.Gets or sets the size, in bits, of the secret key used for the symmetric algorithm.

LegalBlockSizes LegalBlockSizes LegalBlockSizes LegalBlockSizes
LegalKeySizes LegalKeySizes LegalKeySizes LegalKeySizes
Mode Mode Mode Mode

Obtient ou définit le mode de fonctionnement pour l'algorithme symétrique.Gets or sets the mode for operation of the symmetric algorithm.

Padding Padding Padding Padding

Obtient ou définit le mode de remplissage utilisé dans l'algorithme symétrique.Gets or sets the padding mode used in the symmetric algorithm.

Méthodes

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

Libère toutes les ressources utilisées par la classe SymmetricAlgorithm.Releases all resources used by the SymmetricAlgorithm class.

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

Crée un objet déchiffreur symétrique avec la clé et le vecteur d'initialisation actuels.Creates a symmetric decryptor object using the current key and initialization vector (IV).

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

Crée un objet déchiffreur symétrique avec la clé et le vecteur d'initialisation spécifiés.Creates a symmetric decryptor object using the specified key and initialization vector (IV).

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

Crée un objet chiffreur symétrique avec la clé et le vecteur d'initialisation actuels.Creates a symmetric encryptor object using the current key and initialization vector (IV).

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

Crée un objet chiffreur symétrique avec la clé et le vecteur d'initialisation spécifiés.Creates a symmetric encryptor object using the specified key and initialization vector (IV).

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

Libère toutes les ressources utilisées par l'instance actuelle de la classe SymmetricAlgorithm.Releases all resources used by the current instance of the SymmetricAlgorithm class.

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

Libère les ressources non managées utilisées par SymmetricAlgorithm et libère éventuellement les ressources managées.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)

Détermine si l'objet spécifié est identique à l'objet actuel.Determines whether the specified object is equal to the current object.

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

Génère un vecteur d'initialisation aléatoire à utiliser pour l'algorithme symétrique.Generates a random initialization vector (IV) to use for the symmetric algorithm.

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

Génère une clé aléatoire à utiliser pour l'algorithme symétrique.Generates a random key to use for the symmetric algorithm.

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

Fait office de fonction de hachage par défaut.Serves as the default hash function.

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

Obtient le Type de l'instance actuelle.Gets the Type of the current instance.

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

Crée une copie superficielle du Object actuel.Creates a shallow copy of the current Object.

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

Retourne une chaîne qui représente l'objet actuel.Returns a string that represents the current object.

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

Détermine si la taille de clé spécifiée est valide pour l'algorithme actuel.Determines whether the specified key size is valid for the current algorithm.

(Inherited from SymmetricAlgorithm)

Champs

BlockSizeValue BlockSizeValue BlockSizeValue BlockSizeValue

Représente la taille de bloc, en bits, de l'opération de chiffrement.Represents the block size, in bits, of the cryptographic operation.

(Inherited from SymmetricAlgorithm)
FeedbackSizeValue FeedbackSizeValue FeedbackSizeValue FeedbackSizeValue

Représente la taille des commentaires, en bits, de l'opération de chiffrement.Represents the feedback size, in bits, of the cryptographic operation.

(Inherited from SymmetricAlgorithm)
IVValue IVValue IVValue IVValue

Représente le vecteur d'initialisation (IV) pour l'algorithme symétrique.Represents the initialization vector (IV) for the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
KeySizeValue KeySizeValue KeySizeValue KeySizeValue

Représente la taille, en bits, de la clé secrète utilisée par l'algorithme symétrique.Represents the size, in bits, of the secret key used by the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
KeyValue KeyValue KeyValue KeyValue

Représente la clé secrète pour l'algorithme symétrique.Represents the secret key for the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
LegalBlockSizesValue LegalBlockSizesValue LegalBlockSizesValue LegalBlockSizesValue

Spécifie les tailles de bloc, en octets, prises en charge par l'algorithme symétrique.Specifies the block sizes, in bits, that are supported by the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
LegalKeySizesValue LegalKeySizesValue LegalKeySizesValue LegalKeySizesValue

Spécifie les tailles de clé, en octets, prises en charge par l'algorithme symétrique.Specifies the key sizes, in bits, that are supported by the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
ModeValue ModeValue ModeValue ModeValue

Représente le mode de chiffrement utilisé dans l'algorithme symétrique.Represents the cipher mode used in the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
PaddingValue PaddingValue PaddingValue PaddingValue

Représente le mode de remplissage utilisé dans l'algorithme symétrique.Represents the padding mode used in the symmetric algorithm.

(Inherited from SymmetricAlgorithm)

Implémentations d’interfaces explicites

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

Libère les ressources non managées utilisées par SymmetricAlgorithm et libère éventuellement les ressources managées.Releases the unmanaged resources used by the SymmetricAlgorithm and optionally releases the managed resources.

(Inherited from SymmetricAlgorithm)

S’applique à