Certes 2.2.2

.NET Standard 1.3 .NET Framework 4.5
There is a newer version of this package available.
See the version list below for details.
dotnet add package Certes --version 2.2.2
NuGet\Install-Package Certes -Version 2.2.2
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="Certes" Version="2.2.2" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Certes --version 2.2.2
#r "nuget: Certes, 2.2.2"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install Certes as a Cake Addin
#addin nuget:?package=Certes&version=2.2.2

// Install Certes as a Cake Tool
#tool nuget:?package=Certes&version=2.2.2


Certes is an ACME client runs on .NET 4.5+ and .NET Standard 1.3+, supports ACME v2 and wildcard certificates. It is aimed to provide an easy to use API for managing certificates during deployment processes.


Install Certes nuget package into your project:

Install-Package Certes

or using .NET CLI:

dotnet add package Certes

Let's Encrypt is the primary CA we supported. It's recommend testing against staging environment before using production environment, to avoid hitting the rate limits.


Creating new ACME account:

var acme = new AcmeContext(WellKnownServers.LetsEncryptStagingV2);
var account = acme.NewAccount("admin@example.com", true);

// Save the account key for later use
var pemKey = acme.AccountKey.ToPem();

Use an existing ACME account:

// Load the saved account key
var accountKey = KeyFactory.FromPem(pemKey);
var acme = new AcmeContext(WellKnownServers.LetsEncryptStagingV2, accountKey);
var account = acme.Account();

See API doc for additional operations.


Place a wildcard certificate order (DNS validation is required for wildcard certificates)

var order = await acme.NewOrder(new[] { "*.your.domain.name" });

Generate the value for DNS TXT record

var authz = (await order.Authorizations()).First();
var dnsChallenge = await authz.Dns();
var dnsTxt = acme.AccountKey.DnsTxt(dnsChallenge.Token);

Add a DNS TXT record to _acme-challenge.your.domain.name with dnsTxt value.

For non-wildcard certificate, HTTP challenge is also available

var order = await acme.NewOrder(new[] { "your.domain.name" });


Get the token and key authorization string

var authz = (await order.Authorizations()).First();
var httpChallenge = await authz.Http();
var keyAuthz = httpChallenge.KeyAuthz;

Save the key authorization string in a text file, and upload it to http://your.domain.name/.well-known/acme-challenge/<token>


Ask the ACME server to validate our domain ownership

await challenge.Validate();


Download the certificate once validation is done

var privateKey = KeyFactory.NewKey(KeyAlgorithm.ES256);
var cert = await order.Generate(new CsrInfo
    CountryName = "CA",
    State = "Ontario",
    Locality = "Toronto",
    Organization = "Certes",
    OrganizationUnit = "Dev",
    CommonName = "your.domain.name",
}, privateKey);

Export full chain certification

var certPem = cert.ToPem();

Export PFX

var pfxBuilder = cert.ToPfx(privateKey);
var pfx = pfxBuilder.Build("my-cert", "abcd1234");

Check the APIs for more details.

For ACME v1, please see the doc here.


The CLI is available as a dotnet global tool. .NET Core Runtime 2.1+ is required to use dotnet tools.

To install Certes CLI (you may need to restart the console session if this is the first dotnet tool installed)

dotnet tool install --global dotnet-certes

Use the --help option to get started

certes --help

or check this AppVeyor script for renewing certificates on Azure apps.


We use SemVer for versioning. For the versions available, see the tags on this repository.

Also check the changelog to see what's we are working on.

CI Status

NuGet NuGet NuGet NuGet

AppVeyor AppVeyor codecov BCH compliance

Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows net7.0 net7.0-android net7.0-ios net7.0-maccatalyst net7.0-macos net7.0-tvos net7.0-windows
.NET Core netcoreapp1.0 netcoreapp1.1 netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard1.3 netstandard1.4 netstandard1.5 netstandard1.6 netstandard2.0 netstandard2.1
.NET Framework net45 net451 net452 net46 net461 net462 net463 net47 net471 net472 net48
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen30 tizen40 tizen60
Universal Windows Platform uap uap10.0
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (21)

Showing the top 5 NuGet packages that depend on Certes:

Package Downloads
FluffySpoon.AspNet.LetsEncrypt The ID prefix of this package has been reserved for one of the owners of this package by NuGet.org.

Package Description


Provides API for configuring ASP.NET Core to automatically generate HTTPS certificates. This configures your server to use the ACME protocol to connect with a certificate authority (CA), such as Let's Encrypt (https://letsencrypt.org), to verify ownership of your domain name and generate a HTTPS certificate. This happens automatically when the server starts up, and will renew the certificate automatically when the expiration date is near. This only works with Kestrel, which is the default server configuration for ASP.NET Core projects. Other servers, such as IIS and nginx, are not supported.


Provides Middleware and services to request and store certificates from the Let's Encrypt service for ASP.NET Core applications


ACME wrapper for the data exchange server.


Package Description

GitHub repositories (6)

Showing the top 5 popular GitHub repositories that depend on Certes:

Repository Stars
Free, automatic HTTPS certificate generation for ASP.NET Core web apps
Azure Web App Site Extension for easy installation and configuration of Let's Encrypt issued SSL certifcates for custom domain names.
Exploring a new web architecture with React, Redux, Orleans and Dotnet Core
ARK Survival Evolved application that monitors and extracts data from local ARK servers and exposes this data through a Web App, Web API and Discord Bot. Provides important functions to players: dino listings, food-status, breeding info, statistics; and server admins: rcon-commands, server managing etc.
Version Downloads Last updated
3.0.4 981 1/4/2023
3.0.3 92,365 10/4/2021
3.0.0 37,457 7/18/2021
2.3.4 217,131 3/27/2020
2.3.3 274,903 12/17/2018
2.3.2 53,054 10/20/2018
2.3.1 1,214 10/16/2018
2.3.0 17,829 6/15/2018
2.2.2 1,741 5/31/2018
2.2.1 1,744 5/15/2018
2.2.0 2,513 5/5/2018
2.1.0 1,549 4/28/2018
2.0.1 2,326 3/17/2018
2.0.0 1,581 3/13/2018
1.1.4 2,275 3/4/2018
1.1.3 7,532 11/23/2017
1.1.2 3,281 9/28/2017
1.1.0 3,126 8/17/2017
1.0.7 8,237 7/20/2017 2,713 4/4/2017 1,515 3/29/2017 1,471 3/29/2017 1,493 12/22/2016 1,663 7/13/2016 1,576 7/6/2016 1,665 7/6/2016