SHA256Managed SHA256Managed SHA256Managed SHA256Managed Class

Definition

Berechnet den SHA256-Hash für die Eingabedaten unter Verwendung der verwalteten Bibliothek.Computes the SHA256 hash for the input data using the managed library.

public ref class SHA256Managed : System::Security::Cryptography::SHA256
[System.Runtime.InteropServices.ComVisible(true)]
public class SHA256Managed : System.Security.Cryptography.SHA256
type SHA256Managed = class
    inherit SHA256
Public Class SHA256Managed
Inherits SHA256
Vererbung
Attribute

Beispiele

Im folgenden Beispiel wird der SHA-256-Hash für alle Dateien in einem Verzeichnis berechnet.The following example calculates the SHA-256 hash for all files in a directory.

using namespace System;
using namespace System::IO;
using namespace System::Security::Cryptography;

// Print the byte array in a readable format.
void PrintByteArray( array<Byte>^array )
{
   int i;
   for ( i = 0; i < array->Length; i++ )
   {
      Console::Write( String::Format( "{0:X2}", array[ i ] ) );
      if ( (i % 4) == 3 )
            Console::Write( " " );

   }
   Console::WriteLine();
}

int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   if ( args->Length < 2 )
   {
      Console::WriteLine( "Usage: hashdir <directory>" );
      return 0;
   }

   try
   {

      // Create a DirectoryInfo object representing the specified directory.
      DirectoryInfo^ dir = gcnew DirectoryInfo( args[ 1 ] );

      // Get the FileInfo objects for every file in the directory.
      array<FileInfo^>^files = dir->GetFiles();

      // Initialize a SHA256 hash object.
      SHA256 ^ mySHA256 = SHA256Managed::Create();
      array<Byte>^hashValue;

      // Compute and print the hash values for each file in directory.
      System::Collections::IEnumerator^ myEnum = files->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         FileInfo^ fInfo = safe_cast<FileInfo^>(myEnum->Current);

         // Create a fileStream for the file.
         FileStream^ fileStream = fInfo->Open( FileMode::Open );

         // Compute the hash of the fileStream.
         hashValue = mySHA256->ComputeHash( fileStream );

         // Write the name of the file to the Console.
         Console::Write( "{0}: ", fInfo->Name );

         // Write the hash value to the Console.
         PrintByteArray( hashValue );

         // Close the file.
         fileStream->Close();
      }
      return 0;
   }
   catch ( DirectoryNotFoundException^ ) 
   {
      Console::WriteLine( "Error: The directory specified could not be found." );
   }
   catch ( IOException^ ) 
   {
      Console::WriteLine( "Error: A file in the directory could not be accessed." );
   }

}
using System;
using System.IO;
using System.Security.Cryptography;

public class HashDirectory
{
    public static void Main(String[] args)
    {
        if (args.Length < 1)
        {
            Console.WriteLine("No directory selected.");
            return;
        }

        string directory = args[0];
        if (Directory.Exists(directory))
        {
            // Create a DirectoryInfo object representing the specified directory.
           var dir = new DirectoryInfo(directory);
            // Get the FileInfo objects for every file in the directory.
            FileInfo[] files = dir.GetFiles();
            // Initialize a SHA256 hash object.
            using (SHA256 mySHA256 = SHA256.Create())
            {
                // Compute and print the hash values for each file in directory.
                foreach (FileInfo fInfo in files)
                {
                    try { 
                        // Create a fileStream for the file.
                        FileStream fileStream = fInfo.Open(FileMode.Open);
                        // Be sure it's positioned to the beginning of the stream.
                        fileStream.Position = 0;
                        // Compute the hash of the fileStream.
                        byte[] hashValue = mySHA256.ComputeHash(fileStream);
                        // Write the name and hash value of the file to the console.
                        Console.Write($"{fInfo.Name}: ");
                        PrintByteArray(hashValue);
                        // Close the file.
                        fileStream.Close();
                    }
                    catch (IOException e) {
                        Console.WriteLine($"I/O Exception: {e.Message}");
                    }
                    catch (UnauthorizedAccessException e) {
                        Console.WriteLine($"Access Exception: {e.Message}");
                    }
                }
            }
        }
        else
        {
            Console.WriteLine("The directory specified could not be found.");
        }
    }

    // Display the byte array in a readable format.
    public static void PrintByteArray(byte[] array)
    {
        for (int i = 0; i < array.Length; i++)
        {
            Console.Write($"{array[i]:X2}");
            if ((i % 4) == 3) Console.Write(" ");
        }
        Console.WriteLine();
    }
}
Imports System.IO
Imports System.Security.Cryptography

Public Module HashDirectory

    Public Sub Main(ByVal args() As String)
        If args.Length < 1 Then
            Console.WriteLine("No directory selected")
            Return
        End If

        Dim targetDirectory As String = args(0)
        If Directory.Exists(targetDirectory) Then
            ' Create a DirectoryInfo object representing the specified directory.
            Dim dir As New DirectoryInfo(targetDirectory)
            ' Get the FileInfo objects for every file in the directory.
            Dim files As FileInfo() = dir.GetFiles()
            ' Initialize a SHA256 hash object.
            Using mySHA256 As SHA256 = SHA256.Create()
                ' Compute and print the hash values for each file in directory.
                For Each fInfo  As FileInfo In files
                    Try
                        ' Create a fileStream for the file.
                        Dim fileStream = fInfo.Open(FileMode.Open)
                        ' Be sure it's positioned to the beginning of the stream.
                        fileStream.Position = 0
                        ' Compute the hash of the fileStream.
                        Dim hashValue() As Byte = mySHA256.ComputeHash(fileStream)
                        ' Write the name of the file to the Console.
                        Console.Write(fInfo.Name + ": ")
                        ' Write the hash value to the Console.
                        PrintByteArray(hashValue)
                        ' Close the file.
                        fileStream.Close()
                    Catch e As IOException
                        Console.WriteLine($"I/O Exception: {e.Message}")
                    Catch e As UnauthorizedAccessException 
                        Console.WriteLine($"Access Exception: {e.Message}")
                    End Try    
                Next 
            End Using
        Else
           Console.WriteLine("The directory specified could not be found.")
        End If
    End Sub

    ' Print the byte array in a readable format.
    Public Sub PrintByteArray(array() As Byte)
        For i As Integer = 0 To array.Length - 1
            Console.Write($"{array(i):X2}")
            If i Mod 4 = 3 Then
                Console.Write(" ")
            End If
        Next 
        Console.WriteLine()

    End Sub 
End Module

Hinweise

Der Hash wird als eindeutiger Wert fester Größe verwendet, der eine große Datenmenge darstellt.The hash is used as a unique value of fixed size representing a large amount of data. Hashwerte von zwei Datensätzen sollten nur dann übereinstimmen, wenn die entsprechenden Daten ebenfalls übereinstimmen.Hashes of two sets of data should match if and only if the corresponding data also matches. Kleine Änderungen an den Daten führen zu großen unvorhersehbaren Änderungen am Hash.Small changes to the data result in large unpredictable changes in the hash.

Die Hashgröße für den SHA256Managed Algorithmus beträgt 256 Bits.The hash size for the SHA256Managed algorithm is 256 bits.

Konstruktoren

SHA256Managed() SHA256Managed() SHA256Managed() SHA256Managed()

Initialisiert eine neue Instanz der SHA256Managed-Klasse unter Verwendung der verwalteten Bibliothek.Initializes a new instance of the SHA256Managed class using the managed library.

Methoden

Clear() Clear() Clear() Clear()

Gibt alle von der HashAlgorithm-Klasse verwendeten Ressourcen frei.Releases all resources used by the HashAlgorithm class.

(Inherited from HashAlgorithm)
ComputeHash(Byte[]) ComputeHash(Byte[]) ComputeHash(Byte[]) ComputeHash(Byte[])

Errechnet den Hashwert für das angegebene Bytearray.Computes the hash value for the specified byte array.

(Inherited from HashAlgorithm)
ComputeHash(Byte[], Int32, Int32) ComputeHash(Byte[], Int32, Int32) ComputeHash(Byte[], Int32, Int32) ComputeHash(Byte[], Int32, Int32)

Berechnet den Hashwert für den angegebenen Bereich des angegebenen Bytearrays.Computes the hash value for the specified region of the specified byte array.

(Inherited from HashAlgorithm)
ComputeHash(Stream) ComputeHash(Stream) ComputeHash(Stream) ComputeHash(Stream)

Berechnet den Hashwert für das angegebene Stream-Objekt.Computes the hash value for the specified Stream object.

(Inherited from HashAlgorithm)
Dispose() Dispose() Dispose() Dispose()

Gibt alle von der aktuellen Instanz der HashAlgorithm-Klasse verwendeten Ressourcen frei.Releases all resources used by the current instance of the HashAlgorithm class.

(Inherited from HashAlgorithm)
Dispose(Boolean) Dispose(Boolean) Dispose(Boolean) Dispose(Boolean)

Gibt die vom SHA256Managed-Objekt verwendeten nicht verwalteten Ressourcen und optional die verwalteten Ressourcen frei.Releases unmanaged resources used by the SHA256Managed object and optionally releases the managed resources.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Bestimmt, ob das angegebene Objekt mit dem aktuellen Objekt identisch ist.Determines whether the specified object is equal to the current object.

(Inherited from Object)
Finalize() Finalize() Finalize() Finalize()
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Fungiert als Standardhashfunktion.Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Ruft den Type der aktuellen Instanz ab.Gets the Type of the current instance.

(Inherited from Object)
HashCore(Byte[], Int32, Int32) HashCore(Byte[], Int32, Int32) HashCore(Byte[], Int32, Int32) HashCore(Byte[], Int32, Int32)

Leitet beim Überschreiben in einer abgeleiteten Klasse die in das Objekt geschriebenen Daten zum Errechnen des Hashs an den SHA256-Hashalgorithmus weiter.When overridden in a derived class, routes data written to the object into the SHA256 hash algorithm for computing the hash.

HashCore(ReadOnlySpan<Byte>) HashCore(ReadOnlySpan<Byte>) HashCore(ReadOnlySpan<Byte>) HashCore(ReadOnlySpan<Byte>)
HashFinal() HashFinal() HashFinal() HashFinal()

Schließt beim Überschreiben in einer abgeleiteten Klasse die Berechnung des Hashs ab, nachdem die letzten Daten vom Kryptografiestreamobjekt verarbeitet wurden.When overridden in a derived class, finalizes the hash computation after the last data is processed by the cryptographic stream object.

Initialize() Initialize() Initialize() Initialize()

Initialisiert eine Instanz von SHA256Managed.Initializes an instance of SHA256Managed.

MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Erstellt eine flache Kopie des aktuellen Object.Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

Gibt eine Zeichenfolge zurück, die das aktuelle Objekt darstellt.Returns a string that represents the current object.

(Inherited from Object)
TransformBlock(Byte[], Int32, Int32, Byte[], Int32) TransformBlock(Byte[], Int32, Int32, Byte[], Int32) TransformBlock(Byte[], Int32, Int32, Byte[], Int32) TransformBlock(Byte[], Int32, Int32, Byte[], Int32)

Errechnet den Hashwert für den angegebenen Bereich des Eingabebytearrays und kopiert den angegebenen Bereich des Eingabebytearrays in den angegebenen Bereich des Ausgabebytearrays.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(Byte[], Int32, Int32) TransformFinalBlock(Byte[], Int32, Int32) TransformFinalBlock(Byte[], Int32, Int32) TransformFinalBlock(Byte[], Int32, Int32)

Berechnet den Hashwert für den angegebenen Bereich des angegebenen Bytearrays.Computes the hash value for the specified region of the specified byte array.

(Inherited from HashAlgorithm)
TryComputeHash(ReadOnlySpan<Byte>, Span<Byte>, Int32) TryComputeHash(ReadOnlySpan<Byte>, Span<Byte>, Int32) TryComputeHash(ReadOnlySpan<Byte>, Span<Byte>, Int32) TryComputeHash(ReadOnlySpan<Byte>, Span<Byte>, Int32) Inherited from HashAlgorithm
TryHashFinal(Span<Byte>, Int32) TryHashFinal(Span<Byte>, Int32) TryHashFinal(Span<Byte>, Int32) TryHashFinal(Span<Byte>, Int32)

Eigenschaften

CanReuseTransform CanReuseTransform CanReuseTransform CanReuseTransform

Ruft einen Wert ab, der angibt, ob die aktuelle Transformation wiederverwendet werden kann.Gets a value indicating whether the current transform can be reused.

(Inherited from HashAlgorithm)
CanTransformMultipleBlocks CanTransformMultipleBlocks CanTransformMultipleBlocks CanTransformMultipleBlocks

Ruft beim Überschreiben in einer abgeleiteten Klasse einen Wert ab, der angibt, ob mehrere Blöcke transformiert werden können.When overridden in a derived class, gets a value indicating whether multiple blocks can be transformed.

(Inherited from HashAlgorithm)
Hash Hash Hash Hash

Ruft den Wert des berechneten Hashcodes ab.Gets the value of the computed hash code.

(Inherited from HashAlgorithm)
HashSize HashSize HashSize HashSize

Ruft die Größe des berechneten Hashcodes in Bits ab.Gets the size, in bits, of the computed hash code.

(Inherited from HashAlgorithm)
InputBlockSize InputBlockSize InputBlockSize InputBlockSize

Ruft beim Überschreiben in einer abgeleiteten Klasse die Eingabeblockgröße ab.When overridden in a derived class, gets the input block size.

(Inherited from HashAlgorithm)
OutputBlockSize OutputBlockSize OutputBlockSize OutputBlockSize

Ruft beim Überschreiben in einer abgeleiteten Klasse die Ausgabeblockgröße ab.When overridden in a derived class, gets the output block size.

(Inherited from HashAlgorithm)

Felder

HashSizeValue HashSizeValue HashSizeValue HashSizeValue

Stellt die Größe des berechneten Hashcodes in Bits dar.Represents the size, in bits, of the computed hash code.

(Inherited from HashAlgorithm)
HashValue HashValue HashValue HashValue

Stellt den Wert des errechneten Hashcodes dar.Represents the value of the computed hash code.

(Inherited from HashAlgorithm)
State State State State

Stellt den Zustand der Hashberechnung dar.Represents the state of the hash computation.

(Inherited from HashAlgorithm)

Explizite Schnittstellenimplementierungen

IDisposable.Dispose() IDisposable.Dispose() IDisposable.Dispose() IDisposable.Dispose()

Gibt die von HashAlgorithm verwendeten nicht verwalteten Ressourcen und optional die verwalteten Ressourcen frei.Releases the unmanaged resources used by the HashAlgorithm and optionally releases the managed resources.

(Inherited from HashAlgorithm)

Gilt für:

Siehe auch