public byte[] Sign(byte[] pdf, SignInformation signInfo)
{
PdfReader document = new PdfReader(pdf);
MemoryStream stream = new MemoryStream();
PdfStamper pdfStamper = PdfStamper.CreateSignature(document, stream, '\0');
PdfSignatureAppearance signatureAppearance = pdfStamper.SignatureAppearance;
signatureAppearance.Reason = signInfo.reason; //Reason
signatureAppearance.Location = signInfo.location; //Location
signatureAppearance.CertificationLevel = signInfo.certifyLevel;
signatureAppearance.SignatureRenderingMode = PdfSignatureAppearance.RenderingMode.DESCRIPTION; //Rendering mode
IExternalSignature signature = new RSAProviderPrivateKey(signInfo.cert, signInfo.hashAlgorithm);
try
{
//Do signing
MakeSignature.SignDetached(signatureAppearance, signature, signInfo.chain, null, null, null, 0, signInfo.sigType);
}
catch (Exception e)
{
throw new Exception("Cannot sign the PDF file.", e);
}
return(stream.ToArray());
}
public byte[] SignWithLTVEnable(byte[] pdf, SignInformation signInfo)
{
PdfReader document = new PdfReader(pdf);
MemoryStream stream = new MemoryStream();
//PdfStamper pdfStamper = new PdfStamper(document, stream, '0');
PdfStamper pdfStamper = PdfStamper.CreateSignature(document, stream, '\0');
PdfSignatureAppearance signatureAppearance = pdfStamper.SignatureAppearance;
signatureAppearance.Reason = signInfo.reason; //Reason
signatureAppearance.Location = signInfo.location; //Location
signatureAppearance.CertificationLevel = signInfo.certifyLevel;
signatureAppearance.SignatureRenderingMode = PdfSignatureAppearance.RenderingMode.DESCRIPTION; //Rendering mode
IExternalSignature signature = new RSAProviderPrivateKey(signInfo.cert, signInfo.hashAlgorithm);
bool isTsaConnected = false;
for (int retry = 0; retry < 5; retry++)
{
try
{
//int hash = tsaClient.GetHashCode();
string testString = "test";
byte[] digest;
using (System.Security.Cryptography.SHA256Managed sha256 = new System.Security.Cryptography.SHA256Managed())
{
digest = sha256.ComputeHash(Encoding.UTF8.GetBytes(testString));
}
signInfo.tsaClient.GetTimeStampToken(digest);
isTsaConnected = true;
break;
}
catch (Exception e)
{
Console.WriteLine(e.StackTrace);
}
Console.WriteLine("retry " + (retry + 1));
}
if (signInfo.tsaClient != null && signInfo.crlList != null && isTsaConnected)
{
try
{
//Do signing
MakeSignature.SignDetached(signatureAppearance, signature, signInfo.chain, signInfo.crlList, null, signInfo.tsaClient, 0, signInfo.sigType);
}
catch (Exception e)
{
throw new Exception("Cannot sign the PDF file.", e);
}
}
return(stream.ToArray());
}
