hi to all,
sorry for the post, i've searched the forum but none of the solution has
encountered my problem.
I'va an external Signature Service that give me the signed hash in SHA256.
Now i've to insert this hash into a pdf file.
The code is:
//Richiesta Certificato Utente
UserCertificateRequest certificateRequest = new
UserCertificateRequest();
certificateRequest.applUserId = "tihrcoll";
certificateRequest.applPwd = "tihrcoll1!";
certificateRequest.codTitolare = "TEITHR02A02A002A";
UserCertificateRequestOUT certificateResponse =
proxy.UserCertificateRequest(certificateRequest);
System.Text.UTF8Encoding encoding = new
System.Text.UTF8Encoding();
byte[] byteArray =
encoding.GetBytes(certificateResponse.certArray[0].certPEM);
MemoryStream stream = new MemoryStream(byteArray);
X509CertificateParser certParser = new X509CertificateParser();
X509Certificate cert = certParser.ReadCertificate(stream);
Org.BouncyCastle.X509.X509Certificate[] chain = new
Org.BouncyCastle.X509.X509Certificate[] { cert };
//Istanza Variabili per gestione PDF
PdfReader reader = new PdfReader(FILE_ORIGINARIO);
FileStream fout = new FileStream(FILE_FIRMATO, FileMode.Create,
FileAccess.Write);
PdfStamper stp = PdfStamper.CreateSignature(reader, fout, '\0');
PdfSignatureAppearance sap = stp.SignatureAppearance;
sap.SetCrypto(null, chain, null,
PdfSignatureAppearance.WINCER_SIGNED);
sap.Contact = "ITS Lab";
sap.Reason = "Test Firma Digitale";
sap.Location = "Torre Annunziata (Na)";
sap.SignDate = DateTime.Now;
sap.SetVisibleSignature(new Rectangle(100, 100, 200, 200), 1,
"Signature");
sap.SetExternalDigest(new byte[512], new byte[20], "RSA");
sap.PreClose();
//Calcolo hash del file da firmare
IDigest messageDigest = DigestUtilities.GetDigest("SHA256");
Stream data = sap.RangeStream;
byte[] hash = new byte[messageDigest.GetDigestSize()];
messageDigest.DoFinal(hash, 0);
//Invocazione WebService e calcolo hashSigned
PdfSigGenericPKCS tSig = sap.SigStandard;
PdfLiteral tPDFLiteral =
(PdfLiteral)tSig.Get(PdfName.CONTENTS);
byte[] tOutBytes = new byte[(tPDFLiteral.PosLength - 2) /
2];
//PdfPKCS7 tSigner = tSig.Signer;
PdfPKCS7 tSigner = new PdfPKCS7(null, chain, null, "SHA256",
false);
tSigner.SetExternalDigest(hash,
encoding.GetBytes(hashResponse.hashSignedArray[0]), "RSA");
PdfDictionary tPDFDic = new PdfDictionary();
byte[] tSsig = tSigner.GetEncodedPKCS7();
System.Array.Copy(tSsig, 0, tOutBytes, 0, tSsig.Length);
tPDFDic.Put(PdfName.CONTENTS, new
PdfString(tOutBytes).SetHexWriting(true));
sap.Close(tPDFDic);
And the signature is ok.
Now i've to timestamping the signature field.
I've used the code:
PdfReader reader = new PdfReader(FILE_FIRMATO);
FileStream fout = new FileStream(FILE_TIMESTAMPED,
FileMode.Create, FileAccess.Write);
using (PdfStamper stamper = PdfStamper.CreateSignature(reader,
fout, '\0', null, true))
{
LtvVerification v = stamper.LtvVerification;
AcroFields af = stamper.AcroFields;
foreach (string sigName in af.GetSignatureNames())
{
v.AddVerification(sigName, new OcspClientBouncyCastle(), new
CrlClientImp(), LtvVerification.CertificateOption.WHOLE_CHAIN,
LtvVerification.Level.OCSP_CRL, LtvVerification.CertificateInclusion.YES);
}
PdfSignatureAppearance sap = stamper.SignatureAppearance;
sap.CertificationLevel =
PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED;
// Telecom TSA
TSAClientBouncyCastle tsa = new TSAClientBouncyCastle(TSA_URL,
TSA_ACCNT, TSA_PASSW, 6500, "sha256");
LtvTimestamp.Timestamp(sap, tsa, null);
but it append another sing to the document.
What's wrong???
Uhm ... any help is appreciated!!!
Thanks!!!
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