Rijndael 类

定义

表示 Rijndael 对称加密算法的所有实现必须从其继承的基类。Represents the base class from which all implementations of the Rijndael symmetric encryption algorithm must inherit.

public ref class Rijndael abstract : System::Security::Cryptography::SymmetricAlgorithm
public abstract class Rijndael : System.Security.Cryptography.SymmetricAlgorithm
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class Rijndael : System.Security.Cryptography.SymmetricAlgorithm
type Rijndael = class
    inherit SymmetricAlgorithm
Public MustInherit Class Rijndael
Inherits SymmetricAlgorithm
继承
派生
属性

示例

下面的代码示例使用 Rijndael 类来加密和解密数据。The following code example uses the Rijndael class to encrypt and then decrypt data.

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

namespace RijndaelManaged_Example
{
    class RijndaelExample
    {
        public static void Main()
        {
            try
            {

                string original = "Here is some data to encrypt!";

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

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

                    //Display the original data and the decrypted data.
                    Console.WriteLine("Original:   {0}", original);
                    Console.WriteLine("Round Trip: {0}", roundtrip);
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("Error: {0}", e.Message);
            }
        }
        static byte[] EncryptStringToBytes(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 Rijndael object
            // with the specified key and IV.
            using (Rijndael rijAlg = Rijndael.Create())
            {
                rijAlg.Key = Key;
                rijAlg.IV = IV;

                // Create an encryptor to perform the stream transform.
                ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.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(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 Rijndael object
            // with the specified key and IV.
            using (Rijndael rijAlg = Rijndael.Create())
            {
                rijAlg.Key = Key;
                rijAlg.IV = IV;

                // Create a decryptor to perform the stream transform.
                ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.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 RijndaelExample

    Public Shared Sub Main()
        Try

            Dim original As String = "Here is some data to encrypt!"

            ' Create a new instance of the Rijndael
            ' class.  This generates a new key and initialization 
            ' vector (IV).
            Using myRijndael = Rijndael.Create()

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

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

                'Display the original data and the decrypted data.
                Console.WriteLine("Original:   {0}", original)
                Console.WriteLine("Round Trip: {0}", roundtrip)
            End Using
        Catch e As Exception
            Console.WriteLine("Error: {0}", e.Message)
        End Try

    End Sub

    Shared Function EncryptStringToBytes(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 Rijndael object
        ' with the specified key and IV.
        Using rijAlg = Rijndael.Create()

            rijAlg.Key = Key
            rijAlg.IV = IV

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

    Shared Function DecryptStringFromBytes(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 Rijndael object
        ' with the specified key and IV.
        Using rijAlg = Rijndael.Create()
            rijAlg.Key = Key
            rijAlg.IV = IV

            ' Create a decryptor to perform the stream transform.
            Dim decryptor As ICryptoTransform = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.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 
End Class

注解

此算法支持的密钥长度为128、192或256位;默认为256位。This algorithm supports key lengths of 128, 192, or 256 bits; defaulting to 256 bits. 此算法支持128、192或256位的块大小;默认为128位(Aes兼容)。This algorithm supports block sizes of 128, 192, or 256 bits; defaulting to 128 bits (Aes-compatible).

Rijndael 类是 Aes 算法的前置任务。The Rijndael class is the predecessor of the Aes algorithm. 应使用 Aes 算法,而不是 RijndaelYou should use the Aes algorithm instead of Rijndael. 有关详细信息,请参阅 .NET Security 博客中的Rijndael 与 AES 之间的差异For more information, see the entry The Differences Between Rijndael and AES in the .NET Security blog.

构造函数

Rijndael()

初始化 Rijndael 的新实例。Initializes a new instance of Rijndael.

字段

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.

(继承自 SymmetricAlgorithm)
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.

(继承自 SymmetricAlgorithm)
IVValue

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

(继承自 SymmetricAlgorithm)
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.

(继承自 SymmetricAlgorithm)
KeyValue

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

(继承自 SymmetricAlgorithm)
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.

(继承自 SymmetricAlgorithm)
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.

(继承自 SymmetricAlgorithm)
ModeValue

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

(继承自 SymmetricAlgorithm)
PaddingValue

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

(继承自 SymmetricAlgorithm)

属性

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.

(继承自 SymmetricAlgorithm)
FeedbackSize

获取或设置针对密码反馈 (CFB) 和输出反馈 (OFB) 密码模式的加密操作的反馈大小(以位为单位)。Gets or sets the feedback size, in bits, of the cryptographic operation for the Cipher Feedback (CFB) and Output Feedback (OFB) cipher modes.

(继承自 SymmetricAlgorithm)
IV

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

(继承自 SymmetricAlgorithm)
Key

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

(继承自 SymmetricAlgorithm)
KeySize

获取或设置对称算法所用密钥的大小(以位为单位)。Gets or sets the size, in bits, of the secret key used by the symmetric algorithm.

(继承自 SymmetricAlgorithm)
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.

(继承自 SymmetricAlgorithm)
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.

(继承自 SymmetricAlgorithm)
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.

(继承自 SymmetricAlgorithm)
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.

(继承自 SymmetricAlgorithm)

方法

Clear()

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

(继承自 SymmetricAlgorithm)
Create()

创建加密对象以执行 Rijndael 算法。Creates a cryptographic object to perform the Rijndael algorithm.

Create(String)

创建加密对象以执行 Rijndael 算法的指定实现。Creates a cryptographic object to perform the specified implementation of the Rijndael algorithm.

CreateDecryptor()

用当前的 Key 属性和初始化向量 (IV) 创建对称解密器对象。Creates a symmetric decryptor object with the current Key property and initialization vector (IV).

(继承自 SymmetricAlgorithm)
CreateDecryptor(Byte[], Byte[])

当在派生类中重写时,用指定的 Key 属性和初始化向量 (IV) 创建对称解密器对象。When overridden in a derived class, creates a symmetric decryptor object with the specified Key property and initialization vector (IV).

(继承自 SymmetricAlgorithm)
CreateEncryptor()

用当前的 Key 属性和初始化向量 (IV) 创建对称加密器对象。Creates a symmetric encryptor object with the current Key property and initialization vector (IV).

(继承自 SymmetricAlgorithm)
CreateEncryptor(Byte[], Byte[])

当在派生类中重写时,用指定的 Key 属性和初始化向量 (IV) 创建对称加密器对象。When overridden in a derived class, creates a symmetric encryptor object with the specified Key property and initialization vector (IV).

(继承自 SymmetricAlgorithm)
Dispose()

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

(继承自 SymmetricAlgorithm)
Dispose(Boolean)

释放 SymmetricAlgorithm 使用的非托管资源,并选择性地释放托管资源。Releases the unmanaged resources used by the SymmetricAlgorithm and optionally releases the managed resources.

(继承自 SymmetricAlgorithm)
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.

(继承自 Object)
GenerateIV()

当在派生类中重写时,生成用于该算法的随机初始化向量 (IV)。When overridden in a derived class, generates a random initialization vector (IV) to use for the algorithm.

(继承自 SymmetricAlgorithm)
GenerateKey()

当在派生类中重写时,生成用于该算法的随机密钥 (Key)。When overridden in a derived class, generates a random key (Key) to use for the algorithm.

(继承自 SymmetricAlgorithm)
GetHashCode()

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

(继承自 Object)
GetType()

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

(继承自 Object)
MemberwiseClone()

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

(继承自 Object)
ToString()

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

(继承自 Object)
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.

(继承自 SymmetricAlgorithm)

显式接口实现

IDisposable.Dispose()

释放 SymmetricAlgorithm 使用的非托管资源,并选择性地释放托管资源。Releases the unmanaged resources used by the SymmetricAlgorithm and optionally releases the managed resources.

(继承自 SymmetricAlgorithm)

适用于

另请参阅