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Add Digital Signature sample
Fix csproj
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‎Security/AddDigitalSignature/AddDigitalSignature.cs‎

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using System;
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using System.Collections.Generic;
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using System.Text;
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using Datalogics.PDFL;
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/*
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*
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* This sample program demonstrates the use of AddDigitalSignature.
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*
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* Copyright (c) 2025, Datalogics, Inc. All rights reserved.
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*
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*/
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namespace AddDigitalSignature
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{
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class AddDigitalSignature
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{
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static void Main(string[] args)
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{
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Console.WriteLine("AddDigitalSignature Sample:");
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using (new Library())
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{
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Console.WriteLine("Initialized the library.");
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String sInput = Library.ResourceDirectory + "Sample_Input/SixPages.pdf";
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String sLogo = Library.ResourceDirectory + "Sample_Input/ducky_alpha.tif";
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String sOutput = "DigSig-out.pdf";
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if (args.Length > 0)
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sInput = args[0];
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if (args.Length > 1)
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sOutput = args[1];
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if (args.Length > 2)
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sLogo = args[2];
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Console.WriteLine("Input file: " + sInput);
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Console.WriteLine("Writing to output: " + sOutput);
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using (Document doc = new Document(sInput))
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{
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using (Datalogics.PDFL.SignDoc sigDoc = new Datalogics.PDFL.SignDoc())
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{
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// Setup Sign params
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sigDoc.FieldID = SignatureFieldID.CreateFieldWithQualifiedName;
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sigDoc.FieldName = "Signature_es_:signatureblock";
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// Set credential related attributes
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sigDoc.DigestCategory = DigestCategory.Sha256;
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sigDoc.CredentialDataFormat = CredentialDataFmt.NonPFX;
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sigDoc.SetNonPfxSignerCert("Credentials/DER/RSA_certificate.der", 0, CredentialStorageFmt.OnDisk);
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sigDoc.SetNonPfxPrivateKey("Credentials/DER/RSA_privKey.der", 0, CredentialStorageFmt.OnDisk);
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// Setup the signer information
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// (Logo image is optional)
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sigDoc.SetSignerInfo(sOutput, 0.5, "John Doe", "Chicago, IL", "Approval", "Datalogics, Inc.",
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DisplayTraits.KDisplayAll);
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// Set the size and location of the signature box (optional)
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// If not set, invisible signature will be placed on first page
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sigDoc.SignatureBoxPageNumber = 0;
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sigDoc.SignatureBoxRectangle = new Rect(100, 300, 400, 400);
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// Setup Save params
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sigDoc.OutputPath = sOutput;
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// Finally, sign and save the document
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sigDoc.AddDigitalSignature(doc);
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Console.WriteLine();
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}
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}
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}
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}
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}
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}

‎Security/AddDigitalSignature/AddDigitalSignature.csproj‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">x64</Platform>
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<ProjectGuid>{3790CE63-DB43-4F16-8226-BDFEFA25BCDD}</ProjectGuid>
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<OutputType>Exe</OutputType>
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<RootNamespace>AddDigitalSignature</RootNamespace>
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<AssemblyName>AddDigitalSignature</AssemblyName>
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<TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
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<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
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<Deterministic>true</Deterministic>
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<NuGetPackageImportStamp>
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</NuGetPackageImportStamp>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x64' ">
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<PlatformTarget>x64</PlatformTarget>
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\Debug\</OutputPath>
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<DefineConstants>DEBUG;TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x64' ">
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<PlatformTarget>x64</PlatformTarget>
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<DebugType>pdbonly</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\Release\</OutputPath>
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<DefineConstants>TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="System.Core" />
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<Reference Include="System.Xml.Linq" />
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<Reference Include="System.Data.DataSetExtensions" />
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<Reference Include="Microsoft.CSharp" />
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<Reference Include="System.Data" />
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<Reference Include="System.Net.Http" />
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<Reference Include="System.Xml" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="AddDigitalSignature.cs" />
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</ItemGroup>
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<ItemGroup>
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<None Include="App.config" />
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="Adobe.PDF.Library.LM.NETFramework">
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<Version>18.*</Version>
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</PackageReference>
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</ItemGroup>
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<ItemGroup>
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<Folder Include="Properties\" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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</Project>

‎Security/AddDigitalSignature/App.config‎

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<?xml version="1.0" encoding="utf-8" ?>
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<configuration>
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<startup>
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<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
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</startup>
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</configuration>

‎Security/README.md‎

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## ***AddDigitalSignature***
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Demonstrates adding a digital signature with a logo to a PDF document.
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## ***AddRegexRedaction***
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Uses a regular expression to find a specified phrase of text in a PDF document and then redacts that text.
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