/
SHA256.xml
717 lines (706 loc) · 47.4 KB
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SHA256.xml
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<Type Name="SHA256" FullName="System.Security.Cryptography.SHA256">
<TypeSignature Language="C#" Value="public abstract class SHA256 : System.Security.Cryptography.HashAlgorithm" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi abstract beforefieldinit SHA256 extends System.Security.Cryptography.HashAlgorithm" />
<TypeSignature Language="DocId" Value="T:System.Security.Cryptography.SHA256" />
<TypeSignature Language="VB.NET" Value="Public MustInherit Class SHA256
Inherits HashAlgorithm" />
<TypeSignature Language="F#" Value="type SHA256 = class
 inherit HashAlgorithm" />
<TypeSignature Language="C++ CLI" Value="public ref class SHA256 abstract : System::Security::Cryptography::HashAlgorithm" />
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<Base>
<BaseTypeName>System.Security.Cryptography.HashAlgorithm</BaseTypeName>
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<Interfaces />
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<Docs>
<summary>Computes the <see cref="T:System.Security.Cryptography.SHA256" /> hash for the input data.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
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 and only if the corresponding data also matches. Small changes to the data result in large unpredictable changes in the hash.
The hash size for the <xref:System.Security.Cryptography.SHA256> algorithm is 256 bits.
This is an abstract class.
## Examples
The following example calculates the SHA-256 hash for all files in a directory.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR_Classic/classic SHA256 Example/CPP/source.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.Security.Cryptography/HashAlgorithm/ComputeHash/source.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_Classic/classic SHA256 Example/VB/source.vb" id="Snippet1":::
]]></format>
</remarks>
<related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
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<Parameters />
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<summary>Initializes a new instance of <see cref="T:System.Security.Cryptography.SHA256" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
You cannot create an instance of an abstract class. Application code create a new instance of a derived class.
]]></format>
</remarks>
<related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
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<summary>Allows specific implementations of this abstract class to be instantiated.</summary>
<remarks>To be added.</remarks>
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<ReturnType>System.Security.Cryptography.SHA256</ReturnType>
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<Docs>
<summary>Creates an instance of the default implementation of <see cref="T:System.Security.Cryptography.SHA256" />.</summary>
<returns>A new instance of <see cref="T:System.Security.Cryptography.SHA256" />. On the .NET Framework, this method creates an instance of the <see cref="T:System.Security.Cryptography.SHA256Managed" /> class if FIPS mode is not active; if FIPS mode is active, it creates an instance of the <see cref="T:System.Security.Cryptography.SHA256Cng" /> class. On .NET Core, it returns an instance of a private class derived from <see cref="T:System.Security.Cryptography.SHA256" />.</returns>
<remarks>To be added.</remarks>
<exception cref="T:System.Reflection.TargetInvocationException">On the .NET Framework 4.6.1 and earlier versions only: The algorithm was used with Federal Information Processing Standards (FIPS) mode enabled, but is not FIPS compatible.</exception>
<related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
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<ReturnValue>
<ReturnType>System.Security.Cryptography.SHA256</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="hashName" Type="System.String" Index="0" FrameworkAlternate="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="hashName">The name of the specific implementation of <see cref="T:System.Security.Cryptography.SHA256" /> to be used.</param>
<summary>Creates an instance of a specified implementation of <see cref="T:System.Security.Cryptography.SHA256" />.</summary>
<returns>A new instance of <see cref="T:System.Security.Cryptography.SHA256" /> using the specified implementation.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The .NET Framework includes the implementations and their associated hashName values:
| Implementation | hashName |
|----------|---------|
| <xref:System.Security.Cryptography.SHA256Managed> | SHA256 </br> SHA-256 <br /> System.Security.Cryptography.SHA256 |
| <xref:System.Security.Cryptography.SHA256Cng> | System.Security.Cryptography.SHA256Cng |
| <xref:System.Security.Cryptography.SHA256CryptoServiceProvider> | System.Security.Cryptography.SHA256CryptoServiceProvider |
]]></format>
</remarks>
<exception cref="T:System.Reflection.TargetInvocationException">On the .NET Framework only: FIPS mode is enabled, but <paramref name="hashName" /> requests <see cref="T:System.Security.Cryptography.SHA256Managed" />, which is not FIPS compatible.</exception>
<related type="Article" href="/dotnet/standard/security/cryptographic-services">Cryptographic Services</related>
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<param name="source">The data to hash.</param>
<summary>Computes the hash of data using the SHA256 algorithm.</summary>
<returns>The hash of the data.</returns>
<remarks>To be added.</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="source" /> is <see langword="null" />.</exception>
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<param name="source">The stream to hash.</param>
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<remarks>To be added.</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="source" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="source" /> does not support reading.</exception>
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<param name="source">The stream to hash.</param>
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<summary>Computes the hash of a stream using the SHA256 algorithm.</summary>
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<remarks>To be added.</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="source" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
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<para>-or-</para>
<para>
<paramref name="source" /> does not support reading.</para>
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<param name="source">The data to hash.</param>
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<summary>Computes the hash of data using the SHA256 algorithm.</summary>
<returns>The total number of bytes written to <paramref name="destination" />.</returns>
<remarks>To be added.</remarks>
<exception cref="T:System.ArgumentException">The buffer in <paramref name="destination" /> is too small to hold the calculated hash size. The SHA256 algorithm always produces a 256-bit hash, or 32 bytes.</exception>
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<param name="source">The stream to hash.</param>
<param name="cancellationToken">The token to monitor for cancellation requests.
The default value is <see cref="P:System.Threading.CancellationToken.None" />.</param>
<summary>Asynchronously computes the hash of a stream using the SHA256 algorithm.</summary>
<returns>The hash of the data.</returns>
<remarks>This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <see cref="T:System.ArgumentException" />, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <see cref="M:System.Security.Cryptography.SHA256.HashData(System.IO.Stream)" />.</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="source" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<paramref name="source" /> does not support reading.</exception>
<exception cref="T:System.OperationCanceledException">The cancellation token was canceled. This exception is stored into the returned task.</exception>
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<param name="source">The stream to hash.</param>
<param name="destination">The buffer to receive the hash value.</param>
<param name="cancellationToken">The token to monitor for cancellation requests.
The default value is <see cref="P:System.Threading.CancellationToken.None" />.</param>
<summary>Asynchronously computes the hash of a stream using the SHA256 algorithm.</summary>
<returns>The total number of bytes written to <paramref name="destination" />.</returns>
<remarks>To be added.</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="source" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
<para>
The buffer in <paramref name="destination" /> is too small to hold the calculated hash
size. The SHA256 algorithm always produces a 256-bit hash, or 32 bytes.
</para>
<para>-or-</para>
<para>
<paramref name="source" /> does not support reading.
</para>
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<exception cref="T:System.OperationCanceledException">The cancellation token was canceled. This exception is stored into the returned task.</exception>
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<summary>The hash size produced by the SHA256 algorithm, in bits.</summary>
<remarks>To be added.</remarks>
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<summary>The hash size produced by the SHA256 algorithm, in bytes.</summary>
<remarks>To be added.</remarks>
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<param name="source">The data to hash.</param>
<param name="destination">The buffer to receive the hash value.</param>
<param name="bytesWritten">When this method returns, the total number of bytes written into <paramref name="destination" />.</param>
<summary>Attempts to compute the hash of data using the SHA256 algorithm.</summary>
<returns>
<see langword="false" /> if <paramref name="destination" /> is too small to hold the calculated hash, <see langword="true" /> otherwise.</returns>
<remarks>To be added.</remarks>
</Docs>
</Member>
</Members>
</Type>