KeyedHashAlgorithm.xml

<Type Name="KeyedHashAlgorithm" FullName="System.Security.Cryptography.KeyedHashAlgorithm">
  <TypeSignature Language="C#" Value="public abstract class KeyedHashAlgorithm : System.Security.Cryptography.HashAlgorithm" />
  <TypeSignature Language="ILAsm" Value=".class public auto ansi abstract beforefieldinit KeyedHashAlgorithm extends System.Security.Cryptography.HashAlgorithm" />
  <TypeSignature Language="DocId" Value="T:System.Security.Cryptography.KeyedHashAlgorithm" />
  <TypeSignature Language="VB.NET" Value="Public MustInherit Class KeyedHashAlgorithm&#xA;Inherits HashAlgorithm" />
  <TypeSignature Language="F#" Value="type KeyedHashAlgorithm = class&#xA;    inherit HashAlgorithm" />
  <TypeSignature Language="C++ CLI" Value="public ref class KeyedHashAlgorithm abstract : System::Security::Cryptography::HashAlgorithm" />
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  <Base>
    <BaseTypeName>System.Security.Cryptography.HashAlgorithm</BaseTypeName>
  </Base>
  <Interfaces />
  <Attributes>
    <Attribute FrameworkAlternate="net-10.0;net-11.0;net-8.0;net-9.0">
      <AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>
      <AttributeName Language="F#">[&lt;System.Runtime.CompilerServices.Nullable(0)&gt;]</AttributeName>
    </Attribute>
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  </Attributes>
  <Docs>
    <summary>Represents the abstract class from which all implementations of keyed hash algorithms must derive.</summary>
    <remarks>
      <format type="text/markdown"><![CDATA[

## 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.

 Hash functions are commonly used with digital signatures and for data integrity. The <xref:System.Security.Cryptography.HMACSHA1> class is an example of a keyed hash algorithm.

 Due to collision problems with SHA-1, Microsoft recommends a security model based on a NIST-approved hash function. For guidance on approved algorithms, see [NIST SP 800-131A Rev. 2](https://csrc.nist.gov/pubs/sp/800/131/a/r2/final).

## Examples
 The following code example demonstrates how to derive from the <xref:System.Security.Cryptography.KeyedHashAlgorithm> class.

 :::code language="csharp" source="~/snippets/csharp/System.Security.Cryptography/KeyedHashAlgorithm/Overview/program.cs" id="Snippet1":::
 :::code language="vb" source="~/snippets/visualbasic/System.Security.Cryptography/KeyedHashAlgorithm/Overview/program.vb" id="Snippet1":::

 ]]></format>
    </remarks>
    <related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
  </Docs>
  <Members>
    <Member MemberName=".ctor">
      <MemberSignature Language="C#" Value="protected KeyedHashAlgorithm ();" />
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      <MemberSignature Language="C++ CLI" Value="protected:&#xA; KeyedHashAlgorithm();" />
      <MemberType>Constructor</MemberType>
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        <AssemblyName>System.Security.Cryptography</AssemblyName>
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      <Docs>
        <summary>Initializes a new instance of the <see cref="T:System.Security.Cryptography.KeyedHashAlgorithm" /> class.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 You cannot create an instance of an abstract class. Application code creates a new instance of a derived class.

 ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
      </Docs>
    </Member>
    <MemberGroup MemberName="Create">
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      <Docs>
        <summary>Creates an instance of an implementation of a keyed hash algorithm.</summary>
      </Docs>
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      <Attributes>
        <Attribute FrameworkAlternate="net-10.0;net-11.0;net-7.0;net-8.0;net-9.0">
          <AttributeName Language="C#">[System.Obsolete("The default implementation of this cryptography algorithm is not supported.", DiagnosticId="SYSLIB0007", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]</AttributeName>
          <AttributeName Language="F#">[&lt;System.Obsolete("The default implementation of this cryptography algorithm is not supported.", DiagnosticId="SYSLIB0007", UrlFormat="https://aka.ms/dotnet-warnings/{0}")&gt;]</AttributeName>
        </Attribute>
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      <ReturnValue>
        <ReturnType>System.Security.Cryptography.KeyedHashAlgorithm</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>Creates an instance of the default implementation of a keyed hash algorithm.</summary>
        <returns>A new <see cref="T:System.Security.Cryptography.HMACSHA1" /> instance, unless the default settings have been changed.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 By default, this overload uses the <xref:System.Security.Cryptography.HMACSHA1> implementation of a keyed hash algorithm. If you want to specify a different implementation, use the <xref:System.Security.Cryptography.KeyedHashAlgorithm.Create(System.String)> overload, which lets you specify an algorithm name, instead. The cryptography configuration system defines the default implementation of the <xref:System.Security.Cryptography.KeyedHashAlgorithm> class.

 Due to collision problems with SHA-1, Microsoft recommends a security model based on a NIST-approved hash function. For guidance on approved algorithms, see [NIST SP 800-131A Rev. 2](https://csrc.nist.gov/pubs/sp/800/131/a/r2/final).

 ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
      </Docs>
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        <ReturnType>System.Security.Cryptography.KeyedHashAlgorithm</ReturnType>
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      </ReturnValue>
      <Parameters>
        <Parameter Name="algName" Type="System.String" Index="0" FrameworkAlternate="net-10.0;net-11.0;net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
      </Parameters>
      <Docs>
        <param name="algName">The keyed hash algorithm implementation to use. The following table shows the valid values for the <paramref name="algName" /> parameter and the algorithms they map to.

 <list type="table"><listheader><term> Parameter value

 </term><description> Implements

 </description></listheader><item><term> System.Security.Cryptography.HMAC

 </term><description><see cref="T:System.Security.Cryptography.HMACSHA1" /></description></item><item><term> System.Security.Cryptography.KeyedHashAlgorithm

 </term><description><see cref="T:System.Security.Cryptography.HMACSHA1" /></description></item><item><term> HMACMD5

 </term><description><see cref="T:System.Security.Cryptography.HMACMD5" /></description></item><item><term> System.Security.Cryptography.HMACMD5

 </term><description><see cref="T:System.Security.Cryptography.HMACMD5" /></description></item><item><term> HMACRIPEMD160

 </term><description><see cref="T:System.Security.Cryptography.HMACRIPEMD160" /></description></item><item><term> System.Security.Cryptography.HMACRIPEMD160

 </term><description><see cref="T:System.Security.Cryptography.HMACRIPEMD160" /></description></item><item><term> HMACSHA1

 </term><description><see cref="T:System.Security.Cryptography.HMACSHA1" /></description></item><item><term> System.Security.Cryptography.HMACSHA1

 </term><description><see cref="T:System.Security.Cryptography.HMACSHA1" /></description></item><item><term> HMACSHA256

 </term><description><see cref="T:System.Security.Cryptography.HMACSHA256" /></description></item><item><term> System.Security.Cryptography.HMACSHA256

 </term><description><see cref="T:System.Security.Cryptography.HMACSHA256" /></description></item><item><term> HMACSHA384

 </term><description><see cref="T:System.Security.Cryptography.HMACSHA384" /></description></item><item><term> System.Security.Cryptography.HMACSHA384

 </term><description><see cref="T:System.Security.Cryptography.HMACSHA384" /></description></item><item><term> HMACSHA512

 </term><description><see cref="T:System.Security.Cryptography.HMACSHA512" /></description></item><item><term> System.Security.Cryptography.HMACSHA512

 </term><description><see cref="T:System.Security.Cryptography.HMACSHA512" /></description></item><item><term> MACTripleDES

 </term><description><see cref="T:System.Security.Cryptography.MACTripleDES" /></description></item><item><term> System.Security.Cryptography.MACTripleDES

 </term><description><see cref="T:System.Security.Cryptography.MACTripleDES" /></description></item></list></param>
        <summary>Creates an instance of the specified implementation of a keyed hash algorithm.</summary>
        <returns>A new instance of the specified keyed hash algorithm.</returns>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks

This method is obsolete in .NET 5 and later versions.

This method supports a number of algorithms, including MD5, SHA-1, SHA-256, and RIPEMD160. For a full list, see the supported values for the `algName` parameter.

 ]]></format>
        </remarks>
        <exception cref="T:System.PlatformNotSupportedException">.NET Core 2.0 - 3.1 and .NET 5 and later: In all cases.</exception>
        <related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
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        <Parameter Name="disposing" Type="System.Boolean" />
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        <param name="disposing">
          <see langword="true" /> to release both managed and unmanaged resources; <see langword="false" /> to release only unmanaged resources.</param>
        <summary>Releases the unmanaged resources used by the <see cref="T:System.Security.Cryptography.KeyedHashAlgorithm" /> and optionally releases the managed resources.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This method is called by the public `Dispose()` method and the <xref:System.Object.Finalize> method, if it has been overridden. `Dispose()` invokes this method with the `disposing` parameter set to `true`. `Finalize` invokes this method with `disposing` set to `false`.

 When the `disposing` parameter is `true`, this method releases all resources held by any managed objects that this <xref:System.Security.Cryptography.KeyedHashAlgorithm> references. This method invokes the `Dispose()` method of each referenced object.

 ]]></format>
        </remarks>
        <block subset="none" type="overrides">
          <para>
            <see langword="Dispose" /> can be called multiple times by other objects. When overriding <see langword="Dispose(Boolean)" />, be careful not to reference objects that have been previously disposed in an earlier call to <see langword="Dispose" />. For more information about how to implement <see langword="Dispose(Boolean)" />, see <see href="/dotnet/standard/garbage-collection/implementing-dispose">Implementing a Dispose Method</see>.

 For more information about <see langword="Dispose" /> and <see langword="Finalize" />, see <see href="/dotnet/standard/garbage-collection/unmanaged">Cleaning Up Unmanaged Resources</see>.</para>
        </block>
        <related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
      </Docs>
    </Member>
    <Member MemberName="Finalize">
      <MemberSignature Language="C#" Value="~KeyedHashAlgorithm ();" />
      <MemberSignature Language="ILAsm" Value=".method familyhidebysig virtual instance void Finalize() cil managed" />
      <MemberSignature Language="DocId" Value="M:System.Security.Cryptography.KeyedHashAlgorithm.Finalize" />
      <MemberSignature Language="VB.NET" Value="Finalize ()" />
      <MemberSignature Language="F#" Value="override this.Finalize : unit -&gt; unit" Usage="keyedHashAlgorithm.Finalize " />
      <MemberSignature Language="C++ CLI" Value="!KeyedHashAlgorithm ()" />
      <MemberType>Method</MemberType>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>1.0.5000.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Security.Cryptography.Primitives</AssemblyName>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Security.Cryptography</AssemblyName>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Void</ReturnType>
      </ReturnValue>
      <Parameters />
      <Docs>
        <summary>This member overrides <see cref="M:System.Object.Finalize" />, and more complete documentation might be available in that topic.

Allows an <see cref="T:System.Object" /> to attempt to free resources and perform other cleanup operations before the <see cref="T:System.Object" /> is reclaimed by garbage collection.</summary>
        <remarks>To be added.</remarks>
      </Docs>
    </Member>
    <Member MemberName="Key">
      <MemberSignature Language="C#" Value="public virtual byte[] Key { get; set; }" />
      <MemberSignature Language="ILAsm" Value=".property instance unsigned int8[] Key" />
      <MemberSignature Language="DocId" Value="P:System.Security.Cryptography.KeyedHashAlgorithm.Key" />
      <MemberSignature Language="VB.NET" Value="Public Overridable Property Key As Byte()" />
      <MemberSignature Language="F#" Value="member this.Key : byte[] with get, set" Usage="System.Security.Cryptography.KeyedHashAlgorithm.Key" />
      <MemberSignature Language="C++ CLI" Value="public:&#xA; virtual property cli::array &lt;System::Byte&gt; ^ Key { cli::array &lt;System::Byte&gt; ^ get(); void set(cli::array &lt;System::Byte&gt; ^ value); };" />
      <MemberType>Property</MemberType>
      <AssemblyInfo>
        <AssemblyName>System.Security.Cryptography.Primitives</AssemblyName>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>1.0.5000.0</AssemblyVersion>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Security.Cryptography</AssemblyName>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
        <AssemblyVersion>11.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Byte[]</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>Gets or sets the key to use in the hash algorithm.</summary>
        <value>The key to use in the hash algorithm.</value>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This property is the public accessor for the <xref:System.Security.Cryptography.KeyedHashAlgorithm.KeyValue> field.



## Examples
 The following code example demonstrates how to override the <xref:System.Security.Cryptography.KeyedHashAlgorithm.Key> property to retrieve the key used in the current <xref:System.Security.Cryptography.KeyedHashAlgorithm> object. This code example is part of a larger example provided for the <xref:System.Security.Cryptography.KeyedHashAlgorithm> class.

 :::code language="csharp" source="~/snippets/csharp/System.Security.Cryptography/KeyedHashAlgorithm/Key/contosokeyedhash.cs" id="Snippet22":::
 :::code language="vb" source="~/snippets/visualbasic/System.Security.Cryptography/KeyedHashAlgorithm/Key/contosokeyedhash.vb" id="Snippet22":::

 ]]></format>
        </remarks>
        <exception cref="T:System.Security.Cryptography.CryptographicException">An attempt was made to change the <see cref="P:System.Security.Cryptography.KeyedHashAlgorithm.Key" /> property after hashing has begun.</exception>
        <related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
      </Docs>
    </Member>
    <Member MemberName="KeyValue">
      <MemberSignature Language="C#" Value="protected byte[] KeyValue;" />
      <MemberSignature Language="ILAsm" Value=".field family unsigned int8[] KeyValue" />
      <MemberSignature Language="DocId" Value="F:System.Security.Cryptography.KeyedHashAlgorithm.KeyValue" />
      <MemberSignature Language="VB.NET" Value="Protected KeyValue As Byte() " />
      <MemberSignature Language="F#" Value="val mutable KeyValue : byte[]" Usage="System.Security.Cryptography.KeyedHashAlgorithm.KeyValue" />
      <MemberSignature Language="C++ CLI" Value="protected: cli::array &lt;System::Byte&gt; ^ KeyValue;" />
      <MemberType>Field</MemberType>
      <AssemblyInfo>
        <AssemblyName>mscorlib</AssemblyName>
        <AssemblyVersion>1.0.5000.0</AssemblyVersion>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.0.5.0</AssemblyVersion>
        <AssemblyVersion>4.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>netstandard</AssemblyName>
        <AssemblyVersion>2.0.0.0</AssemblyVersion>
        <AssemblyVersion>2.1.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Security.Cryptography.Primitives</AssemblyName>
        <AssemblyVersion>4.1.0.0</AssemblyVersion>
        <AssemblyVersion>4.1.1.0</AssemblyVersion>
        <AssemblyVersion>4.1.2.0</AssemblyVersion>
        <AssemblyVersion>5.0.0.0</AssemblyVersion>
        <AssemblyVersion>6.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <AssemblyInfo>
        <AssemblyName>System.Security.Cryptography</AssemblyName>
        <AssemblyVersion>7.0.0.0</AssemblyVersion>
        <AssemblyVersion>8.0.0.0</AssemblyVersion>
        <AssemblyVersion>9.0.0.0</AssemblyVersion>
        <AssemblyVersion>10.0.0.0</AssemblyVersion>
        <AssemblyVersion>11.0.0.0</AssemblyVersion>
      </AssemblyInfo>
      <ReturnValue>
        <ReturnType>System.Byte[]</ReturnType>
      </ReturnValue>
      <Docs>
        <summary>The key to use in the hash algorithm.</summary>
        <remarks>
          <format type="text/markdown"><![CDATA[

## Remarks
 This field is accessed through the <xref:System.Security.Cryptography.KeyedHashAlgorithm.Key> property.

 ]]></format>
        </remarks>
        <related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
      </Docs>
    </Member>
  </Members>
</Type>