SignatureProvider.HashStream Method

Allows a signature provider add-in to create a hash value for the document that you can use to determine if the document contents were tampered with after digital signing.

Namespace:  Microsoft.Office.Core
Assembly:  office (in office.dll)

Syntax

'Declaration
Function HashStream ( _
    QueryContinue As Object, _
    Stream As Object _
) As Array
'Usage
Dim instance As SignatureProvider
Dim QueryContinue As Object
Dim Stream As Object
Dim returnValue As Array

returnValue = instance.HashStream(QueryContinue, _
    Stream)

Array HashStream(
    Object QueryContinue,
    Object Stream
)

Parameters

• QueryContinue
  Type: System.Object

  Provides a way to query the host application for permission to continue the hashing process.

• Stream
  Type: System.Object

  Contains the data stream.

Return Value

Type: System.Array
Array

Remarks

The SignatureProvider object is used exclusively in custom signature provider add-ins. This method is called once per signature data stream in a document. The return value is an array of bytes representing the hash value computed using the hash algorithm.

See Also

Reference

SignatureProvider Interface

SignatureProvider Members

Microsoft.Office.Core Namespace