Charta.Signing 1.8.0

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. 
dotnet add package Charta.Signing --version 1.8.0
                    


                    

                
NuGet\Install-Package Charta.Signing -Version 1.8.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Charta.Signing" Version="1.8.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Charta.Signing" Version="1.8.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Charta.Signing" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add Charta.Signing --version 1.8.0
                    


                    

                
#r "nuget: Charta.Signing, 1.8.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package Charta.Signing@1.8.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=Charta.Signing&version=1.8.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Charta.Signing&version=1.8.0
                    


                            Install as a Cake Tool

Charta.Signing

PAdES digital signatures for Charta — sign generated PDFs with an X.509 certificate. Uses only the .NET cryptography stack: no BouncyCastle, no native dependencies.

Usage

using Charta;
using Charta.Signing;
using System.Security.Cryptography.X509Certificates;

var cert = X509CertificateLoader.LoadPkcs12FromFile("signer.pfx", "password");
var signer = PdfSigners.FromCertificate(cert);

Document.Create(doc => doc.Page(page => page.Content().Text("Signed with Charta")))
    .GenerateSignedPdf("signed.pdf", signer, new SignatureInfo
    {
        Reason = "I approve this document",
        Location = "Istanbul",
    });

The result carries an invisible signature over the whole document (PAdES baseline B-B): a detached CMS SignedData with a SHA-256 digest and the ESS signing-certificate-v2 attribute. Include the issuing chain via the additionalCertificates argument so validators can verify it.

Trusted timestamps (PAdES B-T)

Pass an ITimestampAuthority to embed an RFC 3161 signature timestamp as an unsigned CMS attribute — the signature becomes PAdES B-T, and the signing time is asserted by a trusted third party rather than the signer:

var tsa = TimestampAuthorities.Http(new Uri("https://freetsa.org/tsr"));
var signer = PdfSigners.FromCertificate(cert, timestampAuthority: tsa);

TimestampAuthorities.Http posts to any RFC 3161 HTTP TSA (optionally with basic auth). To route through an offline TSA, a queue, or a captured response, implement ITimestampAuthority yourself — it takes a DER TimeStampReq and returns the DER TimeStampResp.

License

MIT

Product Compatible and additional computed target framework versions.
.NET net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
1.8.0 116 7/10/2026
1.2.0 107 7/9/2026