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HashAlgorithm.TransformBlock(Byte[], Int32, Int32, Byte[], Int32) Método

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Definición

Espacio de nombres:
System.Security.Cryptography
Ensamblado:
System.Security.Cryptography.Primitives.dll
Ensamblado:
System.Security.Cryptography.dll
Ensamblado:
mscorlib.dll
Ensamblado:
netstandard.dll
Source:
HashAlgorithm.cs
Source:
HashAlgorithm.cs
Source:
HashAlgorithm.cs

Calcula el valor hash para la región especificada de la matriz de bytes de entrada y copia la región especificada de la matriz de bytes de entrada resultante en la región indicada de la matriz de bytes de salida.

public:
 virtual int TransformBlock(cli::array <System::Byte> ^ inputBuffer, int inputOffset, int inputCount, cli::array <System::Byte> ^ outputBuffer, int outputOffset);
public int TransformBlock (byte[] inputBuffer, int inputOffset, int inputCount, byte[]? outputBuffer, int outputOffset);
public int TransformBlock (byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset);
abstract member TransformBlock : byte[] * int * int * byte[] * int -> int
override this.TransformBlock : byte[] * int * int * byte[] * int -> int
Public Function TransformBlock (inputBuffer As Byte(), inputOffset As Integer, inputCount As Integer, outputBuffer As Byte(), outputOffset As Integer) As Integer

Parámetros

inputBuffer
Byte[]

La entrada para la cual se calcula el código hash.

inputOffset
Int32

Desplazamiento en la matriz de bytes de entrada a partir del cual se van a empezar a usar los datos.

inputCount
Int32

Número de bytes de la matriz de bytes de entrada que se van a usar como datos.

outputBuffer
Byte[]

Copia de la parte de la matriz de entrada utilizada para calcular el código hash.

outputOffset
Int32

Desplazamiento en la matriz de bytes de salida a partir del cual se van a empezar a escribir los datos.

Devoluciones

Int32

El número de bytes escritos.

Implementaciones

TransformBlock(Byte[], Int32, Int32, Byte[], Int32)

Excepciones

ArgumentException

inputCount utiliza un valor no válido.

O bien

inputBuffer tiene una longitud no válida.

ArgumentNullException

inputBuffer es null.

ArgumentOutOfRangeException

inputOffset está fuera del intervalo. Este parámetro requiere un número no negativo.

ObjectDisposedException

El objeto ya se ha desechado.

Ejemplos

En los ejemplos de código siguientes se usa el TransformFinalBlock método con el TransformBlock método para aplicar un algoritmo hash a una cadena.

using System;
using System.Security.Cryptography;
using System.Text;

class MainClass
{
    public static void Main()
    {
        RandomNumberGenerator rnd = RandomNumberGenerator.Create();

        byte[] input = new byte[20];
        rnd.GetBytes(input);

        Console.WriteLine("Input        : {0}\n", BytesToStr(input));
        PrintHash(input);
        PrintHashOneBlock(input);
        PrintHashMultiBlock(input, 1);
        PrintHashMultiBlock(input, 2);
        PrintHashMultiBlock(input, 3);
        PrintHashMultiBlock(input, 5);
        PrintHashMultiBlock(input, 10);
        PrintHashMultiBlock(input, 11);
        PrintHashMultiBlock(input, 19);
        PrintHashMultiBlock(input, 20);
        PrintHashMultiBlock(input, 21);
    }

    public static string BytesToStr(byte[] bytes)
    {
        StringBuilder str = new StringBuilder();

        for (int i = 0; i < bytes.Length; i++)
            str.AppendFormat("{0:X2}", bytes[i]);

        return str.ToString();
    }

    public static void PrintHash(byte[] input)
    {
        SHA256Managed sha = new SHA256Managed();
        Console.WriteLine("ComputeHash  : {0}", BytesToStr(sha.ComputeHash(input)));
    }

    public static void PrintHashOneBlock(byte[] input)
    {
        SHA256Managed sha = new SHA256Managed();
        sha.TransformFinalBlock(input, 0, input.Length);
        Console.WriteLine("FinalBlock   : {0}", BytesToStr(sha.Hash));
    }

    public static void PrintHashMultiBlock(byte[] input, int size)
    {
        SHA256Managed sha = new SHA256Managed();
        int offset = 0;

        while (input.Length - offset >= size)
            offset += sha.TransformBlock(input, offset, size, input, offset);

        sha.TransformFinalBlock(input, offset, input.Length - offset);
        Console.WriteLine("MultiBlock {0:00}: {1}", size, BytesToStr(sha.Hash));
    }
}
/*
This example produces output similar to the following:

Input        : 45D97219908A572DE336B9DEC787C311D3349F69

ComputeHash  : 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
FinalBlock   : 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
MultiBlock 01: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
MultiBlock 02: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
MultiBlock 03: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
MultiBlock 05: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
MultiBlock 10: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
MultiBlock 11: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
MultiBlock 19: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
MultiBlock 20: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
MultiBlock 21: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15

*/


Imports System.Text
Imports System.Security.Cryptography

Class Program

    Public Shared Sub Main()
        Dim rnd As RandomNumberGenerator = RandomNumberGenerator.Create
        Dim input() As Byte = New Byte((20) - 1) {}
        rnd.GetBytes(input)
        Console.WriteLine("Input        : {0}"& vbLf, BytesToStr(input))
        PrintHash(input)
        PrintHashOneBlock(input)
        PrintHashMultiBlock(input, 1)
        PrintHashMultiBlock(input, 2)
        PrintHashMultiBlock(input, 3)
        PrintHashMultiBlock(input, 5)
        PrintHashMultiBlock(input, 10)
        PrintHashMultiBlock(input, 11)
        PrintHashMultiBlock(input, 19)
        PrintHashMultiBlock(input, 20)
        PrintHashMultiBlock(input, 21)
    End Sub

    Public Shared Function BytesToStr(ByVal bytes() As Byte) As String
        Dim str As StringBuilder = New StringBuilder
        Dim i As Integer = 0
        Do While (i < bytes.Length)
        str.AppendFormat("{0:X2}", bytes(i))
        i = (i + 1)
        Loop
        Return str.ToString
    End Function

    Public Shared Sub PrintHash(ByVal input() As Byte)
        Dim sha As SHA256Managed = New SHA256Managed
        Console.WriteLine("ComputeHash  : {0}", BytesToStr(sha.ComputeHash(input)))
    End Sub

    Public Shared Sub PrintHashOneBlock(ByVal input() As Byte)
        Dim sha As SHA256Managed = New SHA256Managed
        sha.TransformFinalBlock(input, 0, input.Length)
        Console.WriteLine("FinalBlock   : {0}", BytesToStr(sha.Hash))
    End Sub

    Public Shared Sub PrintHashMultiBlock(ByVal input() As Byte, ByVal size As Integer)
        Dim sha As SHA256Managed = New SHA256Managed
        Dim offset As Integer = 0

        While ((input.Length - offset)  _
            >= size)
        offset = (offset + sha.TransformBlock(input, offset, size, input, offset))

        End While
        sha.TransformFinalBlock(input, offset, (input.Length - offset))
        Console.WriteLine("MultiBlock {0:00}: {1}", size, BytesToStr(sha.Hash))
    End Sub
End Class

' This example produces output similar to the following:
'
' Input        : 45D97219908A572DE336B9DEC787C311D3349F69
'
' ComputeHash  : 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
' FinalBlock   : 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
' MultiBlock 01: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
' MultiBlock 02: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
' MultiBlock 03: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
' MultiBlock 05: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
' MultiBlock 10: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
' MultiBlock 11: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
' MultiBlock 19: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
' MultiBlock 20: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15
' MultiBlock 21: 84E87322C7E3BCA848B0A698EE66E9A9725DA786F9FD4FFD46C385F59AB35B15

Comentarios

Debe llamar al TransformBlock método antes de llamar al TransformFinalBlock método . Debe llamar a ambos métodos antes de recuperar el valor hash final.

Para recuperar el valor hash final después de llamar al TransformFinalBlock método , obtenga la matriz de bytes contenida en la Hash propiedad .

Llamar al TransformBlock método con matrices de entrada y salida diferentes da como resultado .IOException

Se aplica a