GroupDocs.Signature.Net462 26.6.0

Sign Documents API

This on-premise .NET API lets your app end-users sign the electronic documents from a wide range of file formats. Supports several types of e-signing methods.

Content

• Features
• Signature Supported Formats
• Digital Signature Supported Formats
• FormField Signature Supported Formats
• Metadata Signature Supported Formats
• Signature Supported Formats
• Supported Signature Types
• Platform Independence
• Get Started
• Sign PDF with Digital Signature
• Sign with QR Code Signature
• Verify Digital Signatures
• Search Signatures in XLSX
• Remove Signature from Document
• Custom PDF Digital Signature
• Tags

Features

• Create and add signatures to documents of various file formats.
• Specify visual attributes of signatures, such as color, font, margins, etc.
• Search and fetch a list of signatures from a document.
• Determine if the document contains signatures meeting specified criteria.
• Extract basic information about the document.
• Generate image representation of document pages for preview.
• Distinguish created signatures from the actual document.
• Put encrypted text into the QR-code signature or embed custom data objects.

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Signature Supported Formats

The following section lists the supported file formats for the barcode, image, QR-code, stamp, and text signature types:
Microsoft Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX
Microsoft Excel: XLSX, XLS, XLSB, XLSM, XLTX, XLTM
Microsoft PowerPoint: PPTX, PPTM, PPT, PPSX, PPSM, PPS, POTX, POTM
OpenOffice: ODT, OTT, ODS, OTS, ODP, OTP
Image: BMP, DJVU, GIF, JPG, JPEG, PNG, SVG, TIF, TIFF, WEBP
CorelDraw: CDR, CMX
Photoshop: PSD
Metafile: WMF
Portable: PDF

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Digital Signature Supported Formats

Microsoft Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX
Microsoft Excel: XLSX, XLS, XLSB, XLSM, XLTX, XLTM
OpenOffice: ODS, OTS
Portable: PDF

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FormField Signature Supported Formats

Microsoft Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX
Microsoft Excel: XLSX, XLS, XLSB, XLSM, XLTX, XLTM
OpenOffice: ODS, OTS, ODP
Portable: PDF

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Metadata Signature Supported Formats

Microsoft Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX
Microsoft Excel: XLSX, XLS, XLSB, XLSM, XLTX, XLTM
Microsoft PowerPoint: PPTX, PPTM, PPT, PPSX, PPSM, PPS, POTX, POTM
OpenOffice: ODT, OTT, ODS, OTS, ODP, OTP
Image: JPG, JPEG, PNG, SVG, TIF, TIFF
Photoshop: PSD
Portable: PDF

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Supported Signature Types

• Text stamps
• Text labels
• Text as an image signature
• Image signature
• Digital signature
• Barcode signature
• QR-code signature
• Metadata signature
• Form-field signature

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Platform Independence

GroupDocs.Signature for .NET does not require any external software or third-party tool to be installed. GroupDocs.Signature for .NET supports any 32-bit or 64-bit operating system where .NET or Mono framework is installed. The other details are as follows:

Microsoft Windows: Microsoft Windows Desktop (x86, x64) (XP & up), Microsoft Windows Server (x86, x64) (2000 & up), Windows Azure
Mac OS: Mac OS X
Linux: Linux (Ubuntu, OpenSUSE, CentOS and others)
Development Environments: Microsoft Visual Studio (2010 & up), Xamarin.Android, Xamarin.IOS, Xamarin.Mac, MonoDevelop 2.4 and later.
Supported Frameworks: GroupDocs.Conversion for .NET supports .NET and Mono frameworks.

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Get Started

Are you ready to give GroupDocs.Signature for .NET a try? Simply execute Install-Package GroupDocs.Signature from Package Manager Console in Visual Studio to fetch & reference GroupDocs.Signature assembly in your project. If you already have GroupDocs.Signature for .Net and want to upgrade it, please execute Update-Package GroupDocs.Signature to get the latest version.

Please check the GitHub Repository for other common usage scenarios.

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Sign PDF with Digital Signature

The example below shows how to sign a PDF document with a digital e-signature using C# language. We can sign any other supported document format in the same way

 using (Signature signature = new Signature("sample.pdf"))
 {
     // initialize digital option with certificate file path
     DigitalSignOptions options = new DigitalSignOptions("certificate.pfx")
     {
         // set signature position
         Left = 100,
         Top = 100,

         Password = "1234567890"
     };
     signature.Sign("signed.pdf", options);
 }

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Sign with QR Code Signature

The code snippet below demonstrates how to sign a PDF document with the QR code signature

 using (Signature signature = new Signature("sample.pdf"))
 {
     // create QRCode option with predefined QRCode text
     QrCodeSignOptions options = new QrCodeSignOptions("JohnSmith")
     {
         // setup QRCode encoding type
         EncodeType = QrCodeTypes.QR,
         // set signature position
         Left = 100,
         Top = 100
     };
     signature.Sign("signed.pdf", options);
 }

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Verify Digital Signatures

This example shows how to verify Digital signature in the document

 using (Signature signature = new Signature("sample.pdf"))
 {
     DigitalVerifyOptions options = new DigitalVerifyOptions("certificate.pfx")
     {
         Comments = "Test comment"
     };
     // verify document signatures
     VerificationResult result = signature.Verify(options);
     if (result.IsValid)
     {
         Console.WriteLine("\nDocument was verified successfully!");
     }
     else
     {
         Console.WriteLine("\nDocument failed verification process.");
     }
 }

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Search Signatures in XLSX

This example shows how to search for Digital signature in the document and analyze digital signature certificate

 using (Signature signature = new Signature("spreadsheet.xlsx"))
 {
     // search for signatures in document
     List<DigitalSignature> signatures = signature.Search<DigitalSignature>(SignatureType.Digital);

     Console.WriteLine("\nSource document contains following signatures.");
     foreach (var digitalSignature in signatures)
     {
         Console.WriteLine("Digital signature found from {0} with validation flag {1}. Certificate SN {2}",
         digitalSignature.SignTime, digitalSignature.IsValid, digitalSignature.Certificate?.SerialNumber);
     }
 } 

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Remove Signature from Document

This example shows how to delete Digital signature that was found using Search method

 using (Signature signature = new Signature("signed.pdf"))
 {
     List<DigitalSignature> signatures = 
         signature.Search<DigitalSignature>(SignatureType.Digital);

     if (signatures.Count > 0)
     {
         DigitalSignature digitalSignature = signatures[0];
         bool result = signature.Delete(digitalSignature);

         if (result)
         {
             Console.WriteLine(
                 $"Digital signature #{digitalSignature.Thumbprint} from " +
                 $"{digitalSignature.SignTime.ToShortDateString()} was deleted."
             );
         }
         else
         {
             Console.WriteLine(
                 $"Signature was not deleted from the document! " +
                 $"Signature# {digitalSignature.Thumbprint} was not found!"
             );
         }
     }
 }

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Custom PDF Digital Signature

This example shows how to specify extra appearances

 using (Signature signature = new Signature("sample.docx"))
 {
     DigitalSignOptions options = new DigitalSignOptions("certificate.pfx")
     {
         // certifiate password
         Password = "1234567890",
         // digital certificate details
         Reason = "Sign",
         Contact = "JohnSmith",
         Location = "Office1",   

         // image as digital certificate appearance on document pages
         ImageFilePath = imagePath,
         //
         AllPages = true,
         Width = 80,
         Height = 60,
         VerticalAlignment = VerticalAlignment.Bottom,
         HorizontalAlignment = HorizontalAlignment.Right,
         Margin = new Padding() { Bottom = 10, Right = 10 },
         // Setup signature line appearance.
         // This appearance will add Signature Line on the first page.
         // Could be useful for .xlsx files.
         Appearance = new DigitalSignatureAppearance("John Smith", "Title", "jonny@test.com")    
     };
     signature.Sign("signed.docx", options);
 }

Source

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Tags

Document Singing | Digital Signature| Sign PDF | Sign DOCX | Sign XLSX | Sign Digitally| Digital Signature| esing| Cross Platform | Document Manipulation | High Performance | DotNet | API | Signature Verification | GroupDocs.Signature | Secure Signing | Document Security | Digital Certificate | X.509 Certificate | Batch Signing | Signature Management | Code Signing | Signature Workflow | Digital Signature API | Electronic Signature API | GroupDocs SDK | Document Integrity | Multi-format Signing