Read signed date from a digitally signed file

[chuoitieu]

Hi guys,
I want to extract signed date from a digitally signed file (.dll, .exe) by VB.Net but don't know how. Can someone help with some hints or sample code?

Thank you very much.
CT

 

[ss7thirty]

I am not sure what you mean by extract a signed date. But you should be able to create a project with a reference to the said .DLL and reference the Objects, Properties, Functions, etc. from the file through your code.

 

[chuoitieu]

Hi guy,
Thanks very much for your reply. May be I am not very clear on this. I create a dll for use in several projects. Before releasing, I sign my dll with a digital signature (by tool provided by digital signature provider). What I want is a way to read signed date, then write a routine to do this to determine what file (if same name) is newer based on digitally signed date. Of course, I can do it manually by choosing the file, and do mouse right click and choose property, but an automatic way by VB.Net code is desired.

Thank you very much,
TD

 

[chuoitieu]

Can someone help with this?
Thank you

 

[JohnH]

Add reference to CAPICOM library (COM tab), and use the SignedCode class.

Dim signed As New CAPICOM.SignedCode
signed.FileName = "C:\file.exe"
Dim cert = signed.Signer.Certificate
Debug.WriteLine("IssuerName " & cert.IssuerName)
Debug.WriteLine("ValidFromDate " & cert.ValidFromDate)
Debug.WriteLine("ValidToDate " & cert.ValidToDate)
For Each att As CAPICOM.Attribute In signed.TimeStamper.AuthenticatedAttributes
    ' one Name here is CAPICOM_AUTHENTICATED_ATTRIBUTE_SIGNING_TIME, its Value is type Date.
    If att.Name = CAPICOM.CAPICOM_ATTRIBUTE.CAPICOM_AUTHENTICATED_ATTRIBUTE_SIGNING_TIME Then
        Debug.WriteLine("SIGNING_TIME " & CDate(att.Value).ToShortDateString)
    End If
Next

 

[chuoitieu]

Dear JohnH,
Thank you very much.

CT