• Article

HashAlgorithm.TransformBlock Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Computes the hash value for the specified region of the input byte array and copies the resulting hash value to the specified region of the output byte array.

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

Syntax

'Declaration
Public Function TransformBlock ( _
    inputBuffer As Byte(), _
    inputOffset As Integer, _
    inputCount As Integer, _
    outputBuffer As Byte(), _
    outputOffset As Integer _
) As Integer

public int TransformBlock(
    byte[] inputBuffer,
    int inputOffset,
    int inputCount,
    byte[] outputBuffer,
    int outputOffset
)

Parameters

  • inputBuffer
    Type: array<System.Byte[]
    The input to compute the hash code for.
  • inputOffset
    Type: System.Int32
    The offset into the input byte array from which to begin using data.
  • inputCount
    Type: System.Int32
    The number of bytes in the input byte array to use as data.
  • outputBuffer
    Type: array<System.Byte[]
    A copy of the part of the input array used to compute the hash code.
  • outputOffset
    Type: System.Int32
    The offset into the output byte array from which to begin writing data.

Return Value

Type: System.Int32
The number of bytes written.

Implements

ICryptoTransform.TransformBlock(array<Byte[], Int32, Int32, array<Byte[], Int32)

Exceptions

Exception Condition
ArgumentException

inputCount uses an invalid value.

-or-

inputBuffer has an invalid length.
ArgumentNullException

inputBuffer is nulla null reference (Nothing in Visual Basic).
ArgumentOutOfRangeException

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

The object has already been disposed.

Remarks

You must call the TransformBlock method before calling the TransformFinalBlock method. You must call both methods before you retrieve the final hash value.

To retrieve the final hash value after calling the TransformFinalBlock method, get the byte array contained within the Hash property.

Calling the TransformBlock method with different input and output arrays results in an IOException.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.