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

Definição

Calcula o valor de hash para a região especificada da matriz de bytes de entrada e copia a região especificada da matriz de bytes de entrada para a região especificada da matriz de bytes de saída.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.

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);
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

Parâmetros

inputBuffer
Byte[]

A entrada para a qual calcular o código hash.The input to compute the hash code for.

inputOffset
Int32

O deslocamento na matriz de bytes de entrada do qual começar a usar os dados.The offset into the input byte array from which to begin using data.

inputCount
Int32

O número de bytes na matriz de bytes de entrada a ser usado como dados.The number of bytes in the input byte array to use as data.

outputBuffer
Byte[]

Uma cópia da parte da matriz de entrada usada para calcular o código hash.A copy of the part of the input array used to compute the hash code.

outputOffset
Int32

O deslocamento na matriz de bytes de saída do qual começar a gravar os dados.The offset into the output byte array from which to begin writing data.

Retornos

O número de bytes gravados.The number of bytes written.

Implementações

Exceções

inputCount usa um valor inválido.inputCount uses an invalid value.

- ou --or- inputBuffer tem um tamanho inválido.inputBuffer has an invalid length.

inputBuffer é null.inputBuffer is null.

inputOffset está fora do intervalo.inputOffset is out of range. Esse parâmetro requer um número não negativo.This parameter requires a non-negative number.

O objeto já foi descartado.The object has already been disposed.

Exemplos

Os exemplos de código a seguir TransformFinalBlock usam o método TransformBlock com o método para hash de uma cadeia de caracteres.The following code examples use the TransformFinalBlock method with the TransformBlock method to hash a string.

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));
    }

}

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

Comentários

Você deve chamar o TransformBlock método antes de chamar TransformFinalBlock o método.You must call the TransformBlock method before calling the TransformFinalBlock method. Você deve chamar os dois métodos antes de recuperar o valor de hash final.You must call both methods before you retrieve the final hash value.

Para recuperar o valor de hash final depois de TransformFinalBlock chamar o método, obtenha a matriz de bytes Hash contida na propriedade.To retrieve the final hash value after calling the TransformFinalBlock method, get the byte array contained within the Hash property.

Chamar o TransformBlock método com diferentes matrizes de entrada e saída resulta IOExceptionem um.Calling the TransformBlock method with different input and output arrays results in an IOException.

Aplica-se a