PdfSignatureBuilder(IExternalSigner) Constructor

Initializes a new instance of the PdfSignatureBuilder class with specified settings.

Namespace: DevExpress.Pdf

Assembly: DevExpress.Pdf.v25.1.Core.dll

NuGet Package: DevExpress.Pdf.Core

Declaration

C#

public PdfSignatureBuilder(
    IExternalSigner signer
)

VB.NET

Public Sub New(
    signer As IExternalSigner
)

Parameters

Name	Type	Description
signer	IExternalSigner	An object used to generate a signature.

Remarks

Use this class constructor to create and sign a new signature form field.

Sign with a PKCS#7 Signature

The PDF Document API supports PKCS#7 signatures. The Pkcs7Signer class represents this signature type. You can create a Pkcs7SignerBase descendant to use custom PKCS#7 signature implementation.

The signature form field’s name and bounds are determined automatically. Use the PdfSignatureFieldInfo object to specify information about the signature form field’s name, bounds and rotation angle.

The code sample below shows how to create and sign a new signature form field:

C#

//Load a document to be signed
using (var signer = new PdfDocumentSigner("SignedDocument.pdf"))
{
    //Specify the name and location of the signature field
    var description = new PdfSignatureFieldInfo(1);
    description.Name = "SignatureField";
    description.SignatureBounds = new PdfRectangle(10, 10, 150, 150);

    //Create a PKCS#7 signature
    Pkcs7Signer signature = new Pkcs7Signer("Signing Documents//testcert.pfx", "123", HashAlgorithmType.SHA256);

    //Apply a signature to a new form field
    var signatureBuilder = new PdfSignatureBuilder(signature, description);

    //Specify the signature's image and signer information
    signatureBuilder.SetImageData(System.IO.File.ReadAllBytes("Signing Documents//Signature.jpg"));
    signatureBuilder.Location = "USA";
    signatureBuilder.Name = "Jane Cooper";

    //Sign and save the document
    signer.SaveDocument("out2.pdf", signatureBuilder);
}

VB.NET

' Load a document to be signed
Using signer = New PdfDocumentSigner("SignedDocument.pdf")


  'Specify the name and location of the signature field
  Dim description = New PdfSignatureFieldInfo(1)
  description.Name = "SignatureField"
  description.SignatureBounds = New PdfRectangle(10, 10, 150, 150)

  'Create a PKCS#7 signature
  Dim signature As Pkcs7Signer = New Pkcs7Signer("Signing Documents//testcert.pfx", "123", HashAlgorithmType.SHA256)

  'Apply a signature to a new form field
  Dim signatureBuilder = New PdfSignatureBuilder(signature, description)

  'Specify the signature's image and signer information
  signatureBuilder.SetImageData(System.IO.File.ReadAllBytes("Signing Documents//Signature.jpg"))
  signatureBuilder.Location = "USA"
  signatureBuilder.Name = "Jane Cooper"

  'Sign and save the document
  signer.SaveDocument("out2.pdf", signatureBuilder)
End Using