DESCryptoServiceProvider DESCryptoServiceProvider DESCryptoServiceProvider DESCryptoServiceProvider Class

定义

定义访问数据加密标准 (DES) 算法的加密服务提供程序 (CSP) 版本的包装对象。Defines a wrapper object to access the cryptographic service provider (CSP) version of the Data Encryption Standard (DES) algorithm. 此类不能被继承。This class cannot be inherited.

public ref class DESCryptoServiceProvider sealed : System::Security::Cryptography::DES
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class DESCryptoServiceProvider : System.Security.Cryptography.DES
type DESCryptoServiceProvider = class
    inherit DES
Public NotInheritable Class DESCryptoServiceProvider
Inherits DES
继承
DESCryptoServiceProviderDESCryptoServiceProviderDESCryptoServiceProviderDESCryptoServiceProvider
属性

示例

下面的代码示例使用DESCryptoServiceProvider(的实现DES) 与指定的键 (Key) 和初始化向量 (IV) 来加密指定的文件inNameThe following code example uses DESCryptoServiceProvider (an implementation of DES) with the specified key (Key) and initialization vector (IV) to encrypt a file specified by inName. 它然后将加密的结果输出到指定的文件outNameIt then outputs the encrypted result to the file specified by outName.

void EncryptData( String^ inName, String^ outName, array<Byte>^desKey, array<Byte>^desIV )
{
   
   //Create the file streams to handle the input and output files.
   FileStream^ fin = gcnew FileStream( inName,FileMode::Open,FileAccess::Read );
   FileStream^ fout = gcnew FileStream( outName,FileMode::OpenOrCreate,FileAccess::Write );
   fout->SetLength( 0 );
   
   //Create variables to help with read and write.
   array<Byte>^bin = gcnew array<Byte>(100);
   long rdlen = 0; //This is the total number of bytes written.

   long totlen = (long)fin->Length; //This is the total length of the input file.

   int len; //This is the number of bytes to be written at a time.

   DES^ des = gcnew DESCryptoServiceProvider;
   CryptoStream^ encStream = gcnew CryptoStream( fout,des->CreateEncryptor( desKey, desIV ),CryptoStreamMode::Write );
   Console::WriteLine( "Encrypting..." );
   
   //Read from the input file, then encrypt and write to the output file.
   while ( rdlen < totlen )
   {
      len = fin->Read( bin, 0, 100 );
      encStream->Write( bin, 0, len );
      rdlen = rdlen + len;
      Console::WriteLine( "{0} bytes processed", rdlen );
   }

   encStream->Close();
   fout->Close();
   fin->Close();
}

private static void EncryptData(String inName, String outName, byte[] desKey, byte[] desIV)
 {    
     //Create the file streams to handle the input and output files.
     FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
     FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
     fout.SetLength(0);
       
     //Create variables to help with read and write.
     byte[] bin = new byte[100]; //This is intermediate storage for the encryption.
     long rdlen = 0;              //This is the total number of bytes written.
     long totlen = fin.Length;    //This is the total length of the input file.
     int len;                     //This is the number of bytes to be written at a time.
 
     DES des = new DESCryptoServiceProvider();          
     CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write);
                
     Console.WriteLine("Encrypting...");
 
     //Read from the input file, then encrypt and write to the output file.
     while(rdlen < totlen)
     {
         len = fin.Read(bin, 0, 100);
         encStream.Write(bin, 0, len);
         rdlen = rdlen + len;
         Console.WriteLine("{0} bytes processed", rdlen);
     }
 
     encStream.Close();  
     fout.Close();
     fin.Close();                   
 }
Private Shared Sub EncryptData(inName As String, outName As String, _
desKey() As Byte, desIV() As Byte)

    'Create the file streams to handle the input and output files.
    Dim fin As New FileStream(inName, FileMode.Open, FileAccess.Read)
    Dim fout As New FileStream(outName, FileMode.OpenOrCreate, _
       FileAccess.Write)
    fout.SetLength(0)
    
    'Create variables to help with read and write.
    Dim bin(4096) As Byte 'This is intermediate storage for the encryption.
    Dim rdlen As Long = 0 'This is the total number of bytes written.
    Dim totlen As Long = fin.Length 'Total length of the input file.
    Dim len As Integer 'This is the number of bytes to be written at a time.
    Dim des As New DESCryptoServiceProvider()
    Dim encStream As New CryptoStream(fout, _
       des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write)
    
    Console.WriteLine("Encrypting...")
    
    'Read from the input file, then encrypt and write to the output file.
    While rdlen < totlen
        len = fin.Read(bin, 0, 4096)
        encStream.Write(bin, 0, len)
        rdlen = Convert.ToInt32(rdlen + len / des.BlockSize * des.BlockSize)
        Console.WriteLine("Processed {0} bytes, {1} bytes total", len, _
           rdlen)
    End While
    
    encStream.Close()
End Sub

可以在相同的方式; 处理解密使用CreateDecryptor而不是CreateEncryptorDecryption can be handled in the same way; use CreateDecryptor instead of CreateEncryptor. 相同的密钥 (Key) 和初始化向量 (IV) 用于加密该文件必须使用对其进行解密。The same key (Key) and initialization vector (IV) used to encrypt the file must be used to decrypt it.

注解

此算法支持密钥长度为 64 位。This algorithm supports a key length of 64 bits.

构造函数

DESCryptoServiceProvider() DESCryptoServiceProvider() DESCryptoServiceProvider() DESCryptoServiceProvider()

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

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

用指定的密钥 (DES) 和初始化向量 (Key) 创建对称数据加密标准 (IV) 解密器对象。Creates a symmetric Data Encryption Standard (DES) decryptor object with the specified key (Key) and initialization vector (IV).

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

用指定的密钥 (DES) 和初始化向量 (Key) 创建对称数据加密标准 (IV) 加密器对象。Creates a symmetric Data Encryption Standard (DES) encryptor object with the specified key (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()

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

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

生成用于该算法的随机密钥 (Key)。Generates a random key (Key) to be used for the 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)

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.

(Inherited from SymmetricAlgorithm)
FeedbackSize FeedbackSize FeedbackSize FeedbackSize

获取或设置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.

(Inherited from SymmetricAlgorithm)
IV IV IV 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.

(Inherited from SymmetricAlgorithm)
Key Key Key Key

获取或设置数据加密标准 (DES) 算法的机密密钥。Gets or sets the secret key for the Data Encryption Standard (DES) algorithm.

(Inherited from DES)
KeySize KeySize KeySize 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.

(Inherited from SymmetricAlgorithm)
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.

(Inherited from SymmetricAlgorithm)
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.

(Inherited from SymmetricAlgorithm)
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.

(Inherited from SymmetricAlgorithm)
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.

(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

另请参阅