DESCryptoServiceProvider 类
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
注意
Derived cryptographic types are obsolete. Use the Create method on the base type instead.
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。 此类不能被继承。
public ref class DESCryptoServiceProvider sealed : System::Security::Cryptography::DESpublic sealed class DESCryptoServiceProvider : System.Security.Cryptography.DES[System.Obsolete("Derived cryptographic types are obsolete. Use the Create method on the base type instead.", DiagnosticId="SYSLIB0021", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public sealed class DESCryptoServiceProvider : System.Security.Cryptography.DES[System.Runtime.InteropServices.ComVisible(true)]
public sealed class DESCryptoServiceProvider : System.Security.Cryptography.DEStype DESCryptoServiceProvider = class
inherit DES[<System.Obsolete("Derived cryptographic types are obsolete. Use the Create method on the base type instead.", DiagnosticId="SYSLIB0021", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
type DESCryptoServiceProvider = class
inherit DES[<System.Runtime.InteropServices.ComVisible(true)>]
type DESCryptoServiceProvider = class
inherit DESPublic NotInheritable Class DESCryptoServiceProvider
Inherits DES- 继承
- 属性
示例
下面的代码示例使用 DESCryptoServiceProvider () 的 DES 实现与指定的密钥 (Key) 和初始化向量 IV () 来加密指定的 inName文件。 然后，它将加密的结果输出到 指定的 outName文件。
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
可以采用相同的方式处理解密：使用 CreateDecryptor 而不是 CreateEncryptor。 () Key 和初始化向量 (IV 用于加密文件的密钥) 必须用于解密该文件。
注解
此算法支持密钥长度为 64 位。
构造函数
| DESCryptoServiceProvider() |
已过时.
初始化 DESCryptoServiceProvider 类的新实例。 |
字段
| BlockSizeValue |
已过时.
表示加密操作的块大小（以位为单位）。 (继承自 SymmetricAlgorithm) |
| FeedbackSizeValue |
已过时.
表示加密操作的反馈大小（以位为单位）。 (继承自 SymmetricAlgorithm) |
| IVValue |
已过时.
表示对称算法的初始化向量 (IV)。 (继承自 SymmetricAlgorithm) |
| KeySizeValue |
已过时.
表示对称算法使用的密钥的大小（以位为单位）。 (继承自 SymmetricAlgorithm) |
| KeyValue |
已过时.
表示对称算法的密钥。 (继承自 SymmetricAlgorithm) |
| LegalBlockSizesValue |
已过时.
指定对称算法支持的块大小（以位为单位）。 (继承自 SymmetricAlgorithm) |
| LegalKeySizesValue |
已过时.
指定对称算法支持的密钥大小（以位为单位）。 (继承自 SymmetricAlgorithm) |
| ModeValue |
已过时.
表示对称算法中使用的密码模式。 (继承自 SymmetricAlgorithm) |
| PaddingValue |
已过时.
表示对称算法中使用的填充模式。 (继承自 SymmetricAlgorithm) |
属性
| BlockSize |
已过时.
获取或设置加密操作的块大小（以位为单位）。 (继承自 SymmetricAlgorithm) |
| FeedbackSize |
已过时.
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）。 (继承自 SymmetricAlgorithm) |
| IV |
已过时.
获取或设置对称算法的初始化向量 (IV)。 (继承自 SymmetricAlgorithm) |
| Key |
已过时.
获取或设置数据加密标准 (DES) 算法的密钥。 (继承自 DES) |
| KeySize |
已过时.
获取或设置对称算法所用密钥的大小（以位为单位）。 (继承自 SymmetricAlgorithm) |
| LegalBlockSizes |
已过时.
获取对称算法支持的块大小（以位为单位）。 (继承自 SymmetricAlgorithm) |
| LegalKeySizes |
已过时.
获取对称算法支持的密钥大小（以位为单位）。 (继承自 SymmetricAlgorithm) |
| Mode |
已过时.
获取或设置对称算法的运算模式。 (继承自 SymmetricAlgorithm) |
| Padding |
已过时.
获取或设置对称算法中使用的填充模式。 (继承自 SymmetricAlgorithm) |
方法
显式接口实现
| IDisposable.Dispose() |
此 API 支持产品基础结构，不能在代码中直接使用。
已过时.
释放由 SymmetricAlgorithm 占用的非托管资源，还可以另外再释放托管资源。 (继承自 SymmetricAlgorithm) |
