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HashAlgorithm Class

Represents the base class from which all implementations of cryptographic hash algorithms must derive.

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

[ComVisibleAttribute(true)]
public abstract class HashAlgorithm : ICryptoTransform, 
	IDisposable

The HashAlgorithm type exposes the following members.

  NameDescription
Protected methodSupported by Silverlight for Windows PhoneHashAlgorithmInitializes a new instance of the HashAlgorithm class.
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  NameDescription
Public propertySupported by Silverlight for Windows PhoneCanReuseTransformGets a value indicating whether the current transform can be reused.
Public propertySupported by Silverlight for Windows PhoneCanTransformMultipleBlocksWhen overridden in a derived class, gets a value indicating whether multiple blocks can be transformed.
Public propertySupported by Silverlight for Windows PhoneHashGets the value of the computed hash code.
Public propertySupported by Silverlight for Windows PhoneHashSizeGets the size, in bits, of the computed hash code.
Public propertySupported by Silverlight for Windows PhoneInputBlockSizeWhen overridden in a derived class, gets the input block size.
Public propertySupported by Silverlight for Windows PhoneOutputBlockSizeWhen overridden in a derived class, gets the output block size.
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  NameDescription
Public methodSupported by Silverlight for Windows PhoneClearReleases all resources used by the HashAlgorithm class.
Public methodSupported by Silverlight for Windows PhoneComputeHash(Byte[])Computes the hash value for the specified byte array.
Public methodSupported by Silverlight for Windows PhoneComputeHash(Stream)Computes the hash value for the specified Stream object.
Public methodSupported by Silverlight for Windows PhoneComputeHash(Byte[], Int32, Int32)Computes the hash value for the specified region of the specified byte array.
Protected methodSupported by Silverlight for Windows PhoneDisposeReleases the unmanaged resources used by the HashAlgorithm and optionally releases the managed resources.
Public methodSupported by Silverlight for Windows PhoneEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by Silverlight for Windows PhoneFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodSupported by Silverlight for Windows PhoneHashCoreWhen overridden in a derived class, routes data written to the object into the hash algorithm for computing the hash.
Protected methodSupported by Silverlight for Windows PhoneHashFinalWhen overridden in a derived class, finalizes the hash computation after the last data is processed by the cryptographic stream object.
Public methodSupported by Silverlight for Windows PhoneInitializeInitializes an implementation of the HashAlgorithm class.
Protected methodSupported by Silverlight for Windows PhoneMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneTransformBlockComputes the hash value for the specified region of the input byte array and copies the resulting hash value to the specified region of the output byte array.
Public methodSupported by Silverlight for Windows PhoneTransformFinalBlockComputes the hash value for the specified region of the specified byte array.
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  NameDescription
Protected fieldSupported by Silverlight for Windows PhoneHashSizeValueRepresents the size, in bits, of the computed hash code.
Protected fieldSupported by Silverlight for Windows PhoneHashValueRepresents the value of the computed hash code.
Protected fieldSupported by Silverlight for Windows PhoneStateRepresents the state of the hash computation.
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  NameDescription
Explicit interface implemetationPrivate methodSupported by Silverlight for Windows PhoneIDisposable.DisposeReleases the unmanaged resources used by the HashAlgorithm and optionally releases the managed resources.
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Hash functions are fundamental to modern cryptography. These functions map binary strings of an arbitrary length to small binary strings of a fixed length, known as hash values. A cryptographic hash function has the property that it is computationally infeasible to find two distinct inputs that hash to the same value. Hash functions are commonly used with digital signatures and for data integrity.

The hash is used as a unique value of fixed size representing a large amount of data. Hashes of two sets of data should match if the corresponding data also matches. Small changes to the data result in large unpredictable changes in the hash.

Notes to Inheritors

When you inherit from the HashAlgorithm class, you must override the following members: HashCore and HashFinal.

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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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