HashAlgorithm.TransformFinalBlock Method (Byte(), Int32, Int32)


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Computes the hash value for the specified region of the specified byte array.

Namespace:   System.Security.Cryptography
Assembly:  mscorlib (in mscorlib.dll)

Public Function TransformFinalBlock (
	inputBuffer As Byte(),
	inputOffset As Integer,
	inputCount As Integer
) As Byte()


Type: System.Byte()

The input to compute the hash code for.

Type: System.Int32

The offset into the byte array from which to begin using data.

Type: System.Int32

The number of bytes in the byte array to use as data.

Return Value

Type: System.Byte()

An array that is a copy of the part of the input that is hashed.

Exception Condition

inputCount uses an invalid value.


inputBuffer has an invalid offset length.


inputBuffer is null.


inputOffset is out of range. This parameter requires a non-negative number.


The object has already been disposed.

You must call the TransformFinalBlock method after calling the TransformBlock method but before you retrieve the final hash value.

Note that the return value of this method is not the hash value, but only a copy of the hashed part of the input data. To retrieve the final hashed value after calling the TransformFinalBlock method, get the byte array contained in the Hash property.

The following code examples use the TransformFinalBlock method with the TransformBlock method to hash a string.

Imports System
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) {}
		Console.WriteLine("Input        : {0}"& vbLf, BytesToStr(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)
		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

.NET Framework
Available since 1.1
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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