Class DigestAlgorithm

Specifies the digestion algorithm.

Inheritance

System.Object

DigestAlgorithm

Namespace: Syncfusion.Pdf.Security

Assembly: Syncfusion.Pdf.Portable.dll

Syntax

public sealed class DigestAlgorithm : Enum

Examples

//Creates a new PDF document.
PdfDocument document = new PdfDocument();
//Adds a new page.
PdfPageBase page = document.Pages.Add();
PdfGraphics graphics = page.Graphics;
//Creates a certificate instance from PFX file with private key.
PdfCertificate pdfCert = new PdfCertificate(@"PDF.pfx", "syncfusion");
//Creates a digital signature.
PdfSignature signature = new PdfSignature(document, page, pdfCert, "Signature");
//Sets signature settings to customize digestion algorithm and cryptographic standrad specified
PdfSignatureSettings properties = signature.Settings;
properties.DigestAlgorithm = DigestAlgorithm.SHA256;
//Sets an image for signature field.
PdfBitmap signatureImage = new PdfBitmap(@"signature.jpg");
//Sets signature information
signature.Bounds = new RectangleF(new PointF(0, 0), signatureImage.PhysicalDimension);
signature.ContactInfo = "[email protected]";
signature.LocationInfo = "Honolulu, Hawaii";
signature.Reason = "I am author of this document.";
//Draws the signature image.
graphics.DrawImage(signatureImage, 0, 0);
//Saves and closes the document.
document.Save("Output.pdf");
document.Close(true);

'Creates a new PDF document.
Dim document As New PdfDocument()
'Adds a new page.
Dim page As PdfPageBase = document.Pages.Add()
Dim graphics As PdfGraphics = page.Graphics
'Creates a certificate instance from PFX file with private key.
Dim pdfCert As New PdfCertificate("PDF.pfx", "syncfusion")
'Creates a digital signature.
Dim signature As New PdfSignature(document, page, pdfCert, "Signature")
'Sets signature settings to customize digestion algorithm and cryptographic standrad specified
Dim properties As PdfSignatureSettings = signature.Settings;
properties.DigestAlgorithm = DigestAlgorithm.SHA256;
'Sets an image for signature field.
Dim signatureImage As New PdfBitmap("signature.jpg")
'Sets signature info.
signature.Bounds = New RectangleF(New PointF(0, 0), signatureImage.PhysicalDimension)
signature.ContactInfo = "[email protected]"
signature.LocationInfo = "Honolulu, Hawaii"
signature.Reason = "I am author of this document."
'Draws the signature image.
graphics.DrawImage(signatureImage, 0, 0)
'Saves and closes the document.
document.Save("Output.pdf")
document.Close(True)

Fields

RIPEMD160

RIPEMD160 message digest algorithm

Declaration

public const DigestAlgorithm RIPEMD160

Field Value

Type
DigestAlgorithm

SHA1

SHA1 message digest algorithm

Declaration

public const DigestAlgorithm SHA1

Field Value

Type
DigestAlgorithm

SHA256

SHA256 message digest algorithm

Declaration

public const DigestAlgorithm SHA256

Field Value

Type
DigestAlgorithm

SHA384

SHA384 message digest algorithm

Declaration

public const DigestAlgorithm SHA384

Field Value

Type
DigestAlgorithm

SHA512

SHA512 message digest algorithm

Declaration

public const DigestAlgorithm SHA512

Field Value

Type
DigestAlgorithm