public bool Sign(string iSignReason, string iSignContact, string iSignLocation, bool visible, string iImageString)
{
string vCertificatesPath = "CN=" + CertificatesName;
#region Geting Certs
X509Store store = new X509Store(_storedName, _storedLocation);
StorePermission sp = new StorePermission(PermissionState.Unrestricted);
sp.Flags = StorePermissionFlags.OpenStore;
sp.Assert();
store.Open(OpenFlags.MaxAllowed);
X509Certificate2 cert = null;
int i = 0;
while ((i < store.Certificates.Count) && (cert == null))
{
if (store.Certificates[i].Subject.ToUpper().Contains(vCertificatesPath))
{
cert = store.Certificates[i];
}
else
{
i++;
}
}
store.Close();
if (cert == null)
{
throw new CryptographicException("Certificate is NULL. Certificate can not be found");
}
Org.BouncyCastle.X509.X509CertificateParser cp = new Org.BouncyCastle.X509.X509CertificateParser();
var cerRawData = cert.RawData;
var certificates = cp.ReadCertificate(cerRawData);
Org.BouncyCastle.X509.X509Certificate[] chain = new Org.BouncyCastle.X509.X509Certificate[] { certificates };
var chainFirst = GetChainBouncyCastle(cert);
#endregion Geting Certs
PdfReader reader = null;
if (string.IsNullOrEmpty(inputPdfFileString))
{
reader = new PdfReader(inputPdfStream);
}
else
{
reader = new PdfReader(this.inputPdfFileString);
}
if (outputPdfStream == null && string.IsNullOrEmpty(outputPdfFileString) == false)
{
outputPdfStream = new FileStream(this.outputPdfFileString, FileMode.OpenOrCreate, FileAccess.Write);
}
if (reader != null && outputPdfStream != null)
{
#region Standard Signing
PdfStamper vStamper = PdfStamper.CreateSignature(reader, outputPdfStream, '\0', null, false);
vStamper.MoreInfo = this.settingMetadata.GetMetaDataHashtable();
vStamper.XmpMetadata = this.settingMetadata.GetStreamedMetaData();
PdfSignatureAppearance vSignatureAppearance = vStamper.SignatureAppearance;
vSignatureAppearance.SetCrypto(null, chain, null, PdfSignatureAppearance.SELF_SIGNED);
vSignatureAppearance.SignDate = SignDate;
vSignatureAppearance.Reason = iSignReason;
vSignatureAppearance.Contact = iSignContact;
vSignatureAppearance.Location = iSignLocation;
vSignatureAppearance.Acro6Layers = true;
vSignatureAppearance.Render = PdfSignatureAppearance.SignatureRender.Description;
if (visible)
{
vSignatureAppearance.SetVisibleSignature(
new iTextSharp.text.Rectangle(ImageLocation.Width, ImageLocation.Height, ImageLocation.Width + ImageSize.Width, ImageLocation.Height + ImageSize.Height),
1, null);
if (File.Exists(iImageString))
{
iTextSharp.text.Image vImage = iTextSharp.text.Image.GetInstance(iImageString);
vSignatureAppearance.Image = vImage;
}
}
vSignatureAppearance.SetExternalDigest(new byte[128], new byte[20], "RSA");
#endregion Standard Signing
#region Self Signed Mode
PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKMS, PdfName.ADBE_PKCS7_SHA1);
dic.Date = new PdfDate(vSignatureAppearance.SignDate);
var vName = PdfPKCS7.GetSubjectFields(chain[0]).GetField("CN");
dic.Name = vName;
if (vSignatureAppearance.Reason != null)
{
dic.Reason = vSignatureAppearance.Reason;
}
if (vSignatureAppearance.Location != null)
{
dic.Location = vSignatureAppearance.Location;
}
vSignatureAppearance.CryptoDictionary = dic;
int csize = 4000;
Dictionary <PdfName, int> exc = new Dictionary <PdfName, int>();
exc[PdfName.CONTENTS] = csize * 2 + 2;
vSignatureAppearance.PreClose(new Hashtable(exc));
HashAlgorithm sha = new SHA1CryptoServiceProvider();
Stream s = vSignatureAppearance.RangeStream;
int read = 0;
byte[] buff = new byte[8192];
while ((read = s.Read(buff, 0, 8192)) > 0)
{
sha.TransformBlock(buff, 0, read, buff, 0);
}
sha.TransformFinalBlock(buff, 0, 0);
byte[] pk = SignMsg(sha.Hash, cert, false);
byte[] outc = new byte[csize];
PdfDictionary dic2 = new PdfDictionary();
Array.Copy(pk, 0, outc, 0, pk.Length);
dic2.Put(PdfName.CONTENTS, new PdfString(outc).SetHexWriting(true));
vSignatureAppearance.Close(dic2);
#endregion Self Signed Mode
if (vSignatureAppearance.IsPreClosed() == false)
{
vStamper.Close();
}
reader.Close();
return(true);
}
return(false);
}
