DESCryptoServiceProvider Class
Defines a wrapper object to access the cryptographic service provider (CSP) version of the Data Encryption Standard (DES) algorithm. This class cannot be inherited.
System.Security.Cryptography::SymmetricAlgorithm
System.Security.Cryptography::DES
System.Security.Cryptography::DESCryptoServiceProvider
Assembly: mscorlib (in mscorlib.dll)
The DESCryptoServiceProvider type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | DESCryptoServiceProvider | Initializes a new instance of the DESCryptoServiceProvider class. |
| Name | Description | |
|---|---|---|
![]() | BlockSize | Gets or sets the block size, in bits, of the cryptographic operation. (Inherited from SymmetricAlgorithm.) |
![]() | FeedbackSize | Gets or sets the feedback size, in bits, of the cryptographic operation. (Inherited from SymmetricAlgorithm.) |
![]() | IV | Gets or sets the initialization vector (IV) for the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
![]() | Key | Gets or sets the secret key for the Data Encryption Standard (DES) algorithm. (Inherited from DES.) |
![]() | KeySize | Gets or sets the size, in bits, of the secret key used by the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
![]() | LegalBlockSizes | Gets the block sizes, in bits, that are supported by the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
![]() | LegalKeySizes | Gets the key sizes, in bits, that are supported by the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
![]() | Mode | Gets or sets the mode for operation of the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
![]() | Padding | Gets or sets the padding mode used in the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
| Name | Description | |
|---|---|---|
![]() | Clear | Releases all resources used by the SymmetricAlgorithm class. (Inherited from SymmetricAlgorithm.) |
![]() | CreateDecryptor() | Creates a symmetric decryptor object with the current Key property and initialization vector (IV). (Inherited from SymmetricAlgorithm.) |
![]() | CreateDecryptor(array<Byte>, array<Byte>) | Creates a symmetric Data Encryption Standard (DES) decryptor object with the specified key (Key) and initialization vector (IV). (Overrides SymmetricAlgorithm::CreateDecryptor(array<Byte>, array<Byte>).) |
![]() | CreateEncryptor() | Creates a symmetric encryptor object with the current Key property and initialization vector (IV). (Inherited from SymmetricAlgorithm.) |
![]() | CreateEncryptor(array<Byte>, array<Byte>) | Creates a symmetric Data Encryption Standard (DES) encryptor object with the specified key (Key) and initialization vector (IV). (Overrides SymmetricAlgorithm::CreateEncryptor(array<Byte>, array<Byte>).) |
![]() | Dispose() | Releases all resources used by the current instance of the SymmetricAlgorithm class. (Inherited from SymmetricAlgorithm.) |
![]() | Dispose(Boolean) | Releases the unmanaged resources used by the SymmetricAlgorithm and optionally releases the managed resources. (Inherited from SymmetricAlgorithm.) |
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() | GenerateIV | Generates a random initialization vector (IV) to use for the algorithm. (Overrides SymmetricAlgorithm::GenerateIV().) |
![]() | GenerateKey | Generates a random key (Key) to be used for the algorithm. (Overrides SymmetricAlgorithm::GenerateKey().) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
![]() | ValidKeySize | Determines whether the specified key size is valid for the current algorithm. (Inherited from SymmetricAlgorithm.) |
| Name | Description | |
|---|---|---|
![]() | BlockSizeValue | Represents the block size, in bits, of the cryptographic operation. (Inherited from SymmetricAlgorithm.) |
![]() | FeedbackSizeValue | Represents the feedback size, in bits, of the cryptographic operation. (Inherited from SymmetricAlgorithm.) |
![]() | IVValue | Represents the initialization vector (IV) for the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
![]() | KeySizeValue | Represents the size, in bits, of the secret key used by the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
![]() | KeyValue | Represents the secret key for the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
![]() | LegalBlockSizesValue | Specifies the block sizes, in bits, that are supported by the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
![]() | LegalKeySizesValue | Specifies the key sizes, in bits, that are supported by the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
![]() | ModeValue | Represents the cipher mode used in the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
![]() | PaddingValue | Represents the padding mode used in the symmetric algorithm. (Inherited from SymmetricAlgorithm.) |
The 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. It 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(); }
Decryption can be handled in the same way; use CreateDecryptor instead of CreateEncryptor. The same key (Key) and initialization vector (IV) used to encrypt the file must be used to decrypt it.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
