AesManaged AesManaged AesManaged AesManaged Class

定义

提供高级加密标准 (AES) 对称算法的托管实现。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
继承

示例

下面的示例演示如何进行加密和解密使用示例数据AesManaged类。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

注解

AES 算法是实质上是 Rijndael 对称算法使用固定的块大小和迭代计数。The AES algorithm is essentially the Rijndael symmetric algorithm with a fixed block size and iteration count. 此类函数一样RijndaelManaged类,但限制为 128 位块,不允许反馈模式。This class functions the same way as the RijndaelManaged class but limits blocks to 128 bits and does not allow feedback modes.

备注

如果 Windows 安全策略设置为美国联邦信息处理标准 (FIPS)-启用兼容的算法,使用此算法,将引发CryptographicExceptionIf the Windows security policy setting for Federal Information Processing Standards (FIPS)-compliant algorithms is enabled, using this algorithm throws a CryptographicException.

构造函数

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

初始化 AesManaged 类的新实例。Initializes a new instance of the AesManaged class.

属性

BlockSize BlockSize BlockSize BlockSize

获取或设置加密操作的块大小(以位为单位)。Gets or sets the block size, in bits, of the cryptographic operation.

FeedbackSize FeedbackSize FeedbackSize FeedbackSize

获取或设置用作反馈的位数。Gets or sets the number of bits to use as feedback.

IV IV IV IV

获取或设置用于对称算法的初始化向量 (IV)。Gets or sets the initialization vector (IV) to use for the symmetric algorithm.

Key Key Key Key

获取或设置用于对称算法的密钥。Gets or sets the secret key used for the symmetric algorithm.

KeySize KeySize KeySize KeySize

获取或设置用于对称算法的密钥大小(以位为单位)。Gets or sets the size, in bits, of the secret key used for the symmetric algorithm.

LegalBlockSizes LegalBlockSizes LegalBlockSizes LegalBlockSizes

获取对称算法支持的块大小(以位为单位)。Gets the block sizes, in bits, that are supported by the symmetric algorithm.

LegalKeySizes LegalKeySizes LegalKeySizes LegalKeySizes

获取对称算法支持的密钥大小(以位为单位)。Gets the key sizes, in bits, that are supported by the symmetric algorithm.

Mode Mode Mode Mode

获取或设置对称算法的运算模式。Gets or sets the mode for operation of the symmetric algorithm.

Padding Padding Padding Padding

获取或设置对称算法中使用的填充模式。Gets or sets the padding mode used in the symmetric algorithm.

方法

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

释放 SymmetricAlgorithm 类使用的所有资源。Releases all resources used by the SymmetricAlgorithm class.

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

使用当前的密钥和初始化向量 (IV) 创建对称解密器对象。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[])

使用指定的密钥和初始化向量 (IV) 创建对称解密器对象。Creates a symmetric decryptor object using the specified key and initialization vector (IV).

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

使用当前的密钥和初始化向量 (IV) 创建对称加密器对象。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[])

使用指定的密钥和初始化向量 (IV) 创建对称加密器对象。Creates a symmetric encryptor object using the specified key and initialization vector (IV).

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

释放 SymmetricAlgorithm 类的当前实例所使用的所有资源。Releases all resources used by the current instance of the SymmetricAlgorithm class.

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

释放由 SymmetricAlgorithm 占用的非托管资源,还可以另外再释放托管资源。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)

确定指定的对象是否等于当前对象。Determines whether the specified object is equal to the current object.

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

生成用于对称算法的随机初始化向量 (IV)。Generates a random initialization vector (IV) to use for the symmetric algorithm.

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

生成用于对称算法的随机密钥。Generates a random key to use for the symmetric algorithm.

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

作为默认哈希函数。Serves as the default hash function.

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

获取当前实例的 TypeGets the Type of the current instance.

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

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

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

返回表示当前对象的字符串。Returns a string that represents the current object.

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

确定指定的密钥大小对当前算法是否有效。Determines whether the specified key size is valid for the current algorithm.

(Inherited from SymmetricAlgorithm)

字段

BlockSizeValue BlockSizeValue BlockSizeValue BlockSizeValue

表示加密操作的块大小(以位为单位)。Represents the block size, in bits, of the cryptographic operation.

(Inherited from SymmetricAlgorithm)
FeedbackSizeValue FeedbackSizeValue FeedbackSizeValue FeedbackSizeValue

表示加密操作的反馈大小(以位为单位)。Represents the feedback size, in bits, of the cryptographic operation.

(Inherited from SymmetricAlgorithm)
IVValue IVValue IVValue IVValue

表示对称算法的初始化向量 (IV)。Represents the initialization vector (IV) for the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
KeySizeValue KeySizeValue KeySizeValue KeySizeValue

表示对称算法使用的密钥的大小(以位为单位)。Represents the size, in bits, of the secret key used by the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
KeyValue KeyValue KeyValue KeyValue

表示对称算法的密钥。Represents the secret key for the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
LegalBlockSizesValue LegalBlockSizesValue LegalBlockSizesValue LegalBlockSizesValue

指定对称算法支持的块大小(以位为单位)。Specifies the block sizes, in bits, that are supported by the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
LegalKeySizesValue LegalKeySizesValue LegalKeySizesValue LegalKeySizesValue

指定对称算法支持的密钥大小(以位为单位)。Specifies the key sizes, in bits, that are supported by the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
ModeValue ModeValue ModeValue ModeValue

表示对称算法中使用的密码模式。Represents the cipher mode used in the symmetric algorithm.

(Inherited from SymmetricAlgorithm)
PaddingValue PaddingValue PaddingValue PaddingValue

表示对称算法中使用的填充模式。Represents the padding mode used in the symmetric algorithm.

(Inherited from SymmetricAlgorithm)

显式界面实现

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

释放由 SymmetricAlgorithm 占用的非托管资源,还可以另外再释放托管资源。Releases the unmanaged resources used by the SymmetricAlgorithm and optionally releases the managed resources.

(Inherited from SymmetricAlgorithm)

适用于