Pkcs7Signer(String, String, HashAlgorithmType) Constructor

SECURITY-RELATED CONSIDERATIONS

Using weak or outdated hash algorithms (such as SHA-1) may allow threat actors to manipulate or predict hash values. Use modern, secure alternatives (such as SHA-256 or stronger).

Initializes a new instance of the Pkcs7Signer class with specified settings.

Namespace: DevExpress.Pdf

Assembly: DevExpress.Pdf.v25.2.Core.dll

NuGet Package: DevExpress.Pdf.Core

Declaration

C#

public Pkcs7Signer(
    string fileName,
    string password,
    HashAlgorithmType hashAlgorithm
)

VB.NET

Public Sub New(
    fileName As String,
    password As String,
    hashAlgorithm As HashAlgorithmType
)

Parameters

Name	Type	Description
fileName	String	A path to a signature certificate file (.pfx file format).
password	String	A password for a certificate.
hashAlgorithm	HashAlgorithmType	A signature’s hash algorithm.

Example

The following code snippet creates and signs 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 the 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 the 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