private void addSignature(Stream inputPdfStream, Stream outputPdfStream, PfxData pfxData)
{
var stamper = PdfStamper.CreateSignature(
new CustomPdfReader(inputPdfStream, pfxData.X509PrivateKeys[0], pfxData.PublicKey),
outputPdfStream, '\0', null, SignatureData.CertificateFile.AppendSignature);
tryAddSignature(stamper);
stamper.Close();
}
private void addSignature(Stream inputPdfStream, PfxData pfxData)
{
byte[] buffer;
using (var outputPdfStream = new MemoryStream())
{
var stamper = PdfStamper.CreateSignature(
new CustomPdfReader(inputPdfStream, pfxData.X509PrivateKeys[0], pfxData.PublicKey),
outputPdfStream, '\0', null, SignatureData.CertificateFile.AppendSignature);
tryAddSignature(stamper);
stamper.Close();
buffer = outputPdfStream.GetBuffer();
}
inputPdfStream.Position = 0;
inputPdfStream.SetLength(0);
using (var signedStream = new MemoryStream(buffer))
{
signedStream.WriteTo(inputPdfStream);
}
}
private void addSignature(string inputPdfPath, string outputPdfPath, PfxData pfxData)
{
if (string.IsNullOrEmpty(inputPdfPath) || !File.Exists(inputPdfPath))
{
throw new FileNotFoundException("Please specify a valid InputPdfPath");
}
if (string.IsNullOrEmpty(outputPdfPath) || !File.Exists(outputPdfPath))
{
throw new FileNotFoundException("Please specify a valid OutputPdfPath");
}
using (var stream = new FileStream(outputPdfPath, FileMode.Create, FileAccess.Write))
{
var stamper = PdfStamper.CreateSignature(
new PdfReader(inputPdfPath, pfxData.X509PrivateKeys[0], pfxData.PublicKey),
stream, '\0', null, SignatureData.CertificateFile.AppendSignature);
tryAddSignature(stamper);
stamper.Close();
}
}
/// <summary>
/// Applies a digital signature to a document
/// </summary>
/// <param name="inputPdfStream">Input/Output pdf file's stream</param>
/// <param name="pfxData">The Personal Information Exchange File Info which is used to encrypt the file.</param>
public void SignPdf(Stream inputPdfStream, PfxData pfxData)
{
validateInputs();
readCertificate();
addSignature(inputPdfStream, pfxData);
}
/// <summary>
/// Applies a digital signature to a document
/// </summary>
/// <param name="inputPdfPath">Input pdf file's path</param>
/// <param name="outputPdfPath">Output/Signed pdf file's path</param>
/// <param name="pfxData">The Personal Information Exchange File Info which is used to encrypt the file.</param>
public void SignPdf(string inputPdfPath, string outputPdfPath, PfxData pfxData)
{
validateInputs();
readCertificate();
addSignature(inputPdfPath, outputPdfPath, pfxData);
}
