I'll answer this in the iTextSharp mailing list given that you posted in
both lists.
Paulo
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
> Behalf Of Seung Hyun Park
> Sent: Monday, June 25, 2007 2:20 PM
> To: [email 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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