/// <summary>
/// Signs the range of document pages using given certificate and signature image.
/// </summary>
/// <param name="doc">Document to sign.</param>
/// <param name="signingCertificate">Signing certificate's data stream.</param>
/// <param name="certPassword">Certificate's password.</param>
/// <param name="signatureImage">Image stream that will represent the signature visually on page.</param>
/// <param name="signatureBoundary">Visual signature boundaries.</param>
/// <param name="signaturePageIndexStart">The index of the first page to sign.</param>
/// <param name="signaturePageIndexEnd">The index of the last page to sign.</param>
/// <param name="outputStream">Output stream, optional. If not set, incremental save will be performed.</param>
/// <returns>Identifier assigned to the created signature field. Using this id you can find this field in doc's AcroForm dictionary.</returns>
public static string Sign(this FixedDocument doc, Stream signingCertificate,
string certPassword, Stream signatureImage, Boundary signatureBoundary,
int signaturePageIndexStart = 0, int signaturePageIndexEnd = 0, Stream outputStream = null)
{
if (doc == null)
{
throw new ArgumentNullException(nameof(doc));
}
if (signingCertificate == null)
{
throw new ArgumentNullException(nameof(signingCertificate));
}
if (certPassword == null)
{
throw new ArgumentNullException(nameof(certPassword));
}
if (signatureImage == null)
{
throw new ArgumentNullException(nameof(signatureImage));
}
if (signatureBoundary == null)
{
throw new ArgumentNullException(nameof(signatureBoundary));
}
if (signaturePageIndexStart < 0 || signaturePageIndexStart > doc.Pages.Count - 1)
{
throw new ArgumentOutOfRangeException(nameof(signaturePageIndexStart));
}
if (signaturePageIndexEnd < signaturePageIndexStart || signaturePageIndexEnd > doc.Pages.Count - 1)
{
throw new ArgumentOutOfRangeException(nameof(signaturePageIndexEnd));
}
string imageId = Guid.NewGuid().ToString("N");
string signatureFieldId = Guid.NewGuid().ToString("N");
// register signature image resource
doc.ResourceManager.RegisterResource(new Image(imageId, signatureImage));
// create signature field and initialize it using a stored
// password protected certificate
SignatureField signatureField = new SignatureField(signatureFieldId);
signatureField.Signature = Signature.Create(new Pkcs12Store(signingCertificate, certPassword));
// add signature field to a document
doc.AcroForm.Fields.Add(signatureField);
// create signature view using the image resource
SignatureFieldView signatureView = new SignatureFieldView(signatureField, signatureBoundary);
signatureView.ViewSettings.Graphic = Graphic.Image;
signatureView.ViewSettings.GraphicResourceID = imageId;
signatureView.ViewSettings.Description = Description.None;
// add view to pages' annotations
for (int i = signaturePageIndexStart; i <= signaturePageIndexEnd; ++i)
{
doc.Pages[i].Annotations.Add(signatureView);
}
// save to specified file or do an incremental update
if (outputStream != null)
{
doc.Save(outputStream);
}
else
{
doc.Save();
}
return(signatureFieldId);
}
/// <summary>
/// Signs the range of document pages using given certificate and signature image.
/// </summary>
/// <param name="doc">Document to sign.</param>
/// <param name="signingCertificate">Signing certificate's data stream.</param>
/// <param name="certPassword">Certificate's password.</param>
/// <param name="signatureText">The text of the signature.</param>
/// <param name="signatureBoundary">Visual signature boundaries.</param>
/// <param name="signaturePageIndexStart">The index of the first page to sign.</param>
/// <param name="signaturePageIndexEnd">The index of the last page to sign.</param>
/// <param name="outputStream">Output stream, optional. If not set, incremental save will be performed.</param>
/// <returns>Identifier assigned to the created signature field. Using this id you can find this field in doc's AcroForm dictionary.</returns>
public static string Sign(this FixedDocument doc, Stream signingCertificate,
string certPassword, string signatureText, Boundary signatureBoundary,
int signaturePageIndexStart = 0, int signaturePageIndexEnd = 0, Stream outputStream = null)
{
if (doc == null)
{
throw new ArgumentNullException(nameof(doc));
}
if (signingCertificate == null)
{
throw new ArgumentNullException(nameof(signingCertificate));
}
if (certPassword == null)
{
throw new ArgumentNullException(nameof(certPassword));
}
if (signatureBoundary == null)
{
throw new ArgumentNullException(nameof(signatureBoundary));
}
if (signaturePageIndexStart < 0 || signaturePageIndexStart > doc.Pages.Count - 1)
{
throw new ArgumentOutOfRangeException(nameof(signaturePageIndexStart));
}
if (signaturePageIndexEnd < signaturePageIndexStart || signaturePageIndexEnd > doc.Pages.Count - 1)
{
throw new ArgumentOutOfRangeException(nameof(signaturePageIndexEnd));
}
// create textual resource
FixedContent signatureTextXObject = new FixedContent(Guid.NewGuid().ToString("N"), new Boundary(0, 0, signatureBoundary.Width, signatureBoundary.Height));
Section section = new Section();
if (!string.IsNullOrEmpty(signatureText))
{
var newLineString = "<br/>";
signatureText = signatureText.Replace("\r\n", newLineString)
.Replace("\n", newLineString)
.Replace("\r", newLineString);
foreach (ContentElement contentElement in ContentElement.FromMarkup(signatureText))
{
contentElement.Font = new Font("TimesNewRoman", 12);
section.Add(contentElement);
}
signatureTextXObject.Content.AppendContentElement(section, signatureBoundary.Width, signatureBoundary.Height);
}
doc.ResourceManager.RegisterResource(signatureTextXObject);
string signatureFieldId = Guid.NewGuid().ToString("N");
// create signature field and initialize it using a stored
// password protected certificate
SignatureField signatureField = new SignatureField(signatureFieldId);
signatureField.Signature = Signature.Create(new Pkcs12Store(signingCertificate, certPassword));
// add signature field to a document
doc.AcroForm.Fields.Add(signatureField);
// create signature view using the image resource
SignatureFieldView signatureView = new SignatureFieldView(signatureField, signatureBoundary);
signatureView.ViewSettings.Graphic = Graphic.XObject;
signatureView.ViewSettings.GraphicResourceID = signatureTextXObject.ID;
signatureView.ViewSettings.Description = Description.None;
// add view to pages' annotations
for (int i = signaturePageIndexStart; i <= signaturePageIndexEnd; ++i)
{
doc.Pages[i].Annotations.Add(signatureView);
}
// save to specified file or do an incremental update
if (outputStream != null)
{
doc.Save(outputStream);
}
else
{
doc.Save();
}
return(signatureFieldId);
}
