KeyedHashAlgorithm Class

2013-01-16

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Represents the abstract class from which all implementations of keyed hash algorithms must derive.

Inheritance Hierarchy

System. . :: . .Object
  Microsoft.SPOT.Cryptoki. . :: . .SessionContainer
    System.Security.Cryptography. . :: . .HashAlgorithm
      System.Security.Cryptography..::..KeyedHashAlgorithm

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

Syntax

'Declaration
Public Class KeyedHashAlgorithm _
    Inherits HashAlgorithm

public class KeyedHashAlgorithm : HashAlgorithm

public ref class KeyedHashAlgorithm : public HashAlgorithm

type KeyedHashAlgorithm =  
    class
        inherit HashAlgorithm
    end

public class KeyedHashAlgorithm extends HashAlgorithm

The KeyedHashAlgorithm type exposes the following members.

Constructors

	Name	Description
	KeyedHashAlgorithm(KeyedHashAlgorithmType, Session)	Initializes a new instance of the KeyedHashAlgorithm class with the specified algorithm and session context.
	KeyedHashAlgorithm(KeyedHashAlgorithmType, CryptoKey)	Initializes a new instance of the KeyedHashAlgorithm class with the specified algorithm and key object.
	KeyedHashAlgorithm(KeyedHashAlgorithmType, String)	Initializes a new instance of the KeyedHashAlgorithm class with the specified algorithm and service provider.

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Properties

	Name	Description
	CanReuseTransform	Gets a value indicating whether the current transform can be reused. (Inherited from HashAlgorithm.)
	CanTransformMultipleBlocks	When overridden in a derived class, gets a value indicating whether multiple blocks can be transformed. (Inherited from HashAlgorithm.)
	Hash	Gets the value of the computed hash code. (Inherited from HashAlgorithm.)
	HashSize	Gets the size, in bits, of the computed hash code. (Inherited from HashAlgorithm.)
	HashType	Gets the hash algorithm type. (Inherited from HashAlgorithm.)
	InputBlockSize	When overridden in a derived class, gets the input block size. (Inherited from HashAlgorithm.)
	IsDisposed	(Inherited from SessionContainer.)
	Key	Gets or sets the key to use in the hash algorithm.
	KeyedHashType	Gets the keyed hash algorithm type.
	OutputBlockSize	When overridden in a derived class, gets the output block size. (Inherited from HashAlgorithm.)
	Session	(Inherited from SessionContainer.)

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Methods

	Name	Description
	Clear	Releases all resources used by the HashAlgorithm class. (Inherited from HashAlgorithm.)
	ComputeHash(array<Byte> [] () [] [])	Computes the hash value for the specified byte array. (Inherited from HashAlgorithm.)
	ComputeHash(Stream)	Computes the hash value for the specified Stream object. (Inherited from HashAlgorithm.)
	ComputeHash(array<Byte> [] () [] [], Int32, Int32)	Computes the hash value for the specified region of the specified byte array. (Inherited from HashAlgorithm.)
	Dispose() () () ()	(Inherited from SessionContainer.)
	Dispose(Boolean)	Releases the unmanaged resources used by the KeyedHashAlgorithm and optionally releases the managed resources. (Overrides HashAlgorithm. . :: . .Dispose(Boolean).)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	(Inherited from SessionContainer.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	Initialize	Initializes an implementation of the HashAlgorithm class. (Inherited from HashAlgorithm.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)
	TransformBlock	Computes the hash value for the specified region of the input byte array and copies the specified region of the input byte array to the specified region of the output byte array. (Inherited from HashAlgorithm.)
	TransformFinalBlock	Computes the hash value for the specified region of the specified byte array. (Inherited from HashAlgorithm.)

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Fields

	Name	Description
	HashValue	Represents the value of the computed hash code. (Inherited from HashAlgorithm.)
	KeyValue	The key to use in the hash algorithm.
	m_digest	Contains the digest. (Inherited from HashAlgorithm.)
	m_hashSize	Contains the hash size. (Inherited from HashAlgorithm.)
	m_isDisposed	(Inherited from SessionContainer.)
	m_isSessionClosing	(Inherited from SessionContainer.)
	m_mechanism	Contains the mechanism. (Inherited from HashAlgorithm.)
	m_ownsSession	(Inherited from SessionContainer.)
	m_session	(Inherited from SessionContainer.)
	OwnsKey	Represents the value that indicates whether algorithm owns the key.
	State	Represents the state of the hash computation. (Inherited from HashAlgorithm.)

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Remarks

Hash functions map binary strings of an arbitrary length to small binary strings of a fixed length. A cryptographic hash function has the property that it is computationally infeasible to find two distinct inputs that hash to the same value. Small changes to the data result in large, unpredictable changes in the hash.

A keyed hash algorithm is a key-dependent, one-way hash function used as a message authentication code. Only someone who knows the key can verify the hash. Keyed hash algorithms provide authenticity without secrecy.

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.

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