I'll answer this in the iTextSharp mailing list given that you posted in
both lists.

Paulo

> -----Original Message-----
> From: itext-questions-bounces@(protected)
> [mailto:itext-questions-bounces@(protected)
> Behalf Of Seung Hyun Park
> Sent: Monday, June 25, 2007 2:20 PM
> To: itext-questions@(protected)
> Subject: [iText-questions] A problem about inserting digital
> signature withiTextSharp
>
> Hello.
>
> I have made a program related to PDF digital signing with iTextSharp.
>
> I already read "How to sign a PDF using iText and iTextSharp" tutorial
> and some postings in the mailing list.
>
> But, I could not succeed in inserting digital signature at
> existing PDF files.
>
>
> My test codes are as followings (it was from the C# sample of iText
> mailing list.);
>
> -------------------
>
>
> Private Sub Test1()
>
>      Dim [alias] As String = "Dark"
>      Dim pk12 As New Pkcs12Store(New FileStream("myTestKey.pfx",
> FileMode.Open, FileAccess.Read, FileShare.ReadWrite),
> "1234".ToCharArray())
>
>      'Below codes were commented because an invalid
> Casting error occurred.
>      '-------------------
>      'Dim i As IEnumerator = pk12.Aliases() '-> generate
> invalid cast error
>
>      'While i.MoveNext()
>      '   [alias] = CStr(i.Current)
>      '   If pk12.IsKeyEntry([alias]) Then
>      '     Exit While
>      '   End If
>      'End While
>      '---------------------
>
>      Dim akp As AsymmetricKeyParameter = pk12.GetKey([alias]).Key
>      Dim ce As X509CertificateEntry() =
> pk12.GetCertificateChain([alias])
>      Dim chain(ce.Length) As X509Certificate
>      Dim k As Integer
>
>      While k < ce.Length
>         chain(k) = ce(k).Certificate
>         k += 1
>      End While
>
>      Dim reader As New PdfReader("unsigned_signature_field.pdf")
>
>      Dim st As PdfStamper = PdfStamper.CreateSignature(reader, New
> FileStream("output.pdf", FileMode.Create, FileAccess.Write), "\0",
> vbNullString, True)
>      Dim sap As PdfSignatureAppearance = st.SignatureAppearance
>
>      sap.SetCrypto(akp, chain, Nothing,
> PdfSignatureAppearance.WINCER _SIGNED)
>      sap.Reason = "My Signature"
>      sap.Location = "Universe"
>      sap.SetVisibleSignature("foobarsig")
>
>      st.Close()      '-> Null reference exception error
> is occurred.
>
>   End Sub
>
> ----------------------------------
>
> An invalid casting error and a null reference exception occurred.
>
> I added comments wherer error was generated in the above codes.
>
>
>
> My testing environments were as this;
>
> 1. I used the latest iTextSharp and BouncyCastle.
>
> 2. My test program was compiled with VS 2003.
>
> 3. I made a pfx file using KeyTool GUI 1.7 and an input file using
> Acrobat 8 Pro.
>
>
>
> I attached my full testing codes, testing key and input files.
>
>
>
> By the way, could you tell me how to sign for self signed
> mode with iTextSharp?
>
> I do now know how to sign although I already read related postings
> because most of them were for JDK; Keystore does not exist at .NET
> framework.
>
>
>
> If you could take a few minutes to answer my questions, I would really
> appreciate it.
>
> Thank you in advance for your help.
>
>
> Best regards,
>
> S. H. Park
>


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