TripleDES 类
定义
重要
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表示三重数据加密标准算法的基类,TripleDES 的所有实现都必须从此基类派生。
public ref class TripleDES abstract : System::Security::Cryptography::SymmetricAlgorithm
[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public abstract class TripleDES : System.Security.Cryptography.SymmetricAlgorithm
public abstract class TripleDES : System.Security.Cryptography.SymmetricAlgorithm
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class TripleDES : System.Security.Cryptography.SymmetricAlgorithm
[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type TripleDES = class
inherit SymmetricAlgorithm
type TripleDES = class
inherit SymmetricAlgorithm
[<System.Runtime.InteropServices.ComVisible(true)>]
type TripleDES = class
inherit SymmetricAlgorithm
Public MustInherit Class TripleDES
Inherits SymmetricAlgorithm
- 继承
- 派生
- 属性
示例
下面的代码示例方法使用 TripleDESCryptoServiceProvider 具有指定密钥 (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>^tdesKey, array<Byte>^tdesIV )
{
//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.
TripleDESCryptoServiceProvider^ tdes = gcnew TripleDESCryptoServiceProvider;
CryptoStream^ encStream = gcnew CryptoStream( fout,tdes->CreateEncryptor( tdesKey, tdesIV ),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();
}
private static void EncryptData(string inName, string outName, byte[] tdesKey, byte[] tdesIV)
{
//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.
TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
CryptoStream encStream = new CryptoStream(fout, tdes.CreateEncryptor(tdesKey, tdesIV), 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();
}
Private Shared Sub EncryptData(inName As String, outName As String, _
tdesKey() As Byte, tdesIV() 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(100) 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 'This is the total length of the input file.
Dim len As Integer 'This is the number of bytes to be written at a time.
Dim tdes As New TripleDESCryptoServiceProvider()
Dim encStream As New CryptoStream(fout, _
tdes.CreateEncryptor(tdesKey, tdesIV), 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)
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
TripleDES 使用算法的 DES 三次连续迭代。 它可以使用两个或三个 56 位密钥。
此算法支持从 128 位到 192 位的密钥长度,增量为 64 位。
构造函数
TripleDES() |
初始化 TripleDES 类的新实例。 |
字段
BlockSizeValue |
表示加密操作的块大小(以位为单位)。 (继承自 SymmetricAlgorithm) |
FeedbackSizeValue |
表示加密操作的反馈大小(以位为单位)。 (继承自 SymmetricAlgorithm) |
IVValue |
表示对称算法的初始化向量 (IV)。 (继承自 SymmetricAlgorithm) |
KeySizeValue |
表示对称算法使用的密钥的大小(以位为单位)。 (继承自 SymmetricAlgorithm) |
KeyValue |
表示对称算法的密钥。 (继承自 SymmetricAlgorithm) |
LegalBlockSizesValue |
指定对称算法支持的块大小(以位为单位)。 (继承自 SymmetricAlgorithm) |
LegalKeySizesValue |
指定对称算法支持的密钥大小(以位为单位)。 (继承自 SymmetricAlgorithm) |
ModeValue |
表示对称算法中使用的密码模式。 (继承自 SymmetricAlgorithm) |
PaddingValue |
表示对称算法中使用的填充模式。 (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)。 (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)。 (继承自 SymmetricAlgorithm) |
IV |
获取或设置对称算法的初始化向量 (IV)。 (继承自 SymmetricAlgorithm) |
Key |
获取或设置 TripleDES 算法的密钥。 |
KeySize |
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 |
获取对称算法支持的块大小(以位为单位)。 |
LegalBlockSizes |
获取对称算法支持的块大小(以位为单位)。 (继承自 SymmetricAlgorithm) |
LegalKeySizes |
获取对称算法支持的密钥大小(以位为单位)。 |
LegalKeySizes |
获取对称算法支持的密钥大小(以位为单位)。 (继承自 SymmetricAlgorithm) |
Mode |
获取或设置对称算法的运算模式。 (继承自 SymmetricAlgorithm) |
Padding |
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。 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) |