HashAlgorithm.ComputeHash Method (Byte[], Int32, Int32)

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

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

public byte[] ComputeHash (
	byte[] buffer,
	int offset,
	int count
public byte[] ComputeHash (
	byte[] buffer, 
	int offset, 
	int count
public function ComputeHash (
	buffer : byte[], 
	offset : int, 
	count : int
) : byte[]
Not applicable.



The input to compute the hash code for.


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


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

Return Value

The computed hash code.

Exception typeCondition


count is an invalid value.


buffer length is invalid.


buffer is a null reference (Nothing in Visual Basic).


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


The object has already been disposed.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0