Certes 2.2.2

There is a newer version of this package available.
See the version list below for details.
Install-Package Certes -Version 2.2.2
dotnet add package Certes --version 2.2.2
<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
The NuGet Team does not provide support for this client. Please contact its maintainers for support.
#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
The NuGet Team does not provide support for this client. Please contact its maintainers for support.


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

NuGet packages (14)

Showing the top 5 NuGet packages that depend on Certes:

Package Downloads

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.


Library for easy installation and renewals of Let's Encrypt SSL certificates on Azure Web Apps. PLEASE READ and understand the known limitations listed here: https://github.com/sjkp/letsencrypt-siteextension/blob/master/README.md#known-issues


Package Description


ACME wrapper for the data exchange server.

GitHub repositories (4)

Showing the top 4 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
Version Downloads Last updated
3.0.0 3,156 7/18/2021
2.3.4 100,429 3/27/2020
2.3.3 210,039 12/17/2018
2.3.2 18,366 10/20/2018
2.3.1 988 10/16/2018
2.3.0 16,603 6/15/2018
2.2.2 1,447 5/31/2018
2.2.1 1,372 5/15/2018
2.2.0 2,243 5/5/2018
2.1.0 1,216 4/28/2018
2.0.1 1,978 3/17/2018
2.0.0 1,312 3/13/2018
1.1.4 1,998 3/4/2018
1.1.3 7,280 11/23/2017
1.1.2 3,027 9/28/2017
1.1.0 2,770 8/17/2017
1.0.7 7,967 7/20/2017 2,303 4/4/2017 1,135 3/29/2017 1,071 3/29/2017 1,124 12/22/2016 1,295 7/13/2016 1,154 7/6/2016 1,244 7/6/2016