DES Class

.NET Framework (current version)

Represents the base class for the Data Encryption Standard (DES) algorithm from which all DES implementations must derive.

Namespace: System.Security.Cryptography
Assembly: mscorlib (in mscorlib.dll)

Inheritance Hierarchy

System::Object
System.Security.Cryptography::SymmetricAlgorithm
System.Security.Cryptography::DES
System.Security.Cryptography::DESCryptoServiceProvider

Syntax

C++

[ComVisibleAttribute(true)]
public ref class DES abstract : SymmetricAlgorithm

Constructors

	Name	Description
	DES()	Initializes a new instance of the DES class.

Properties

	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.(Overrides SymmetricAlgorithm::Key.)
	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.)

Methods

	Name	Description
	Clear()	Releases all resources used by the SymmetricAlgorithm class.(Inherited from SymmetricAlgorithm.)
	Create()	Creates an instance of a cryptographic object to perform the Data Encryption Standard (DES) algorithm.
	Create(String^)	Creates an instance of a cryptographic object to perform the specified implementation of the Data Encryption Standard (DES) algorithm.
	CreateDecryptor()	Creates a symmetric decryptor object with the current Key property and initialization vector (IV).(Inherited from SymmetricAlgorithm.)
	CreateDecryptor(array<Byte>^, array<Byte>^)	When overridden in a derived class, creates a symmetric decryptor object with the specified Key property and initialization vector (IV).(Inherited from SymmetricAlgorithm.)
	CreateEncryptor()	Creates a symmetric encryptor object with the current Key property and initialization vector (IV).(Inherited from SymmetricAlgorithm.)
	CreateEncryptor(array<Byte>^, array<Byte>^)	When overridden in a derived class, creates a symmetric encryptor object with the specified Key property and initialization vector (IV).(Inherited from SymmetricAlgorithm.)
	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()	When overridden in a derived class, generates a random initialization vector (IV) to use for the algorithm.(Inherited from SymmetricAlgorithm.)
	GenerateKey()	When overridden in a derived class, generates a random key (Key) to use for the algorithm. (Inherited from SymmetricAlgorithm.)
	GetHashCode()	Serves as the default hash function. (Inherited from Object.)
	GetType()	Gets the Type of the current instance.(Inherited from Object.)
	IsSemiWeakKey(array<Byte>^)	Determines whether the specified key is semi-weak.
	IsWeakKey(array<Byte>^)	Determines whether the specified key is weak.
	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(Int32)	Determines whether the specified key size is valid for the current algorithm.(Inherited from SymmetricAlgorithm.)

Fields

	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.)

Remarks

This algorithm supports a key length of 64 bits.

Note
A newer asymmetric encryption algorithm, Advanced Encryption Standard (AES), is available. Consider using the Aes class instead of the DES class. Use DES only for compatibility with legacy applications and data.

Examples

The following code example uses DESCryptoServiceProvider (an implementation of DES) to encrypt a string to an in-memory buffer. It then decrypts and displays the round-tripped string.

C++

No code example is currently available or this language may not be supported.

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.

Version Information

.NET Framework
Available since 1.1

Thread Safety

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.