2019-03-08 18:47:06 +00:00
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---
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title: "Welcome"
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date: 2019-03-03T16:39:46+01:00
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draft: false
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chapter: true
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---
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# Lego
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Let's Encrypt client and ACME library written in Go.
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## Features
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- Register with CA
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- Obtain certificates, both from scratch or with an existing CSR
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- Renew certificates
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- Revoke certificates
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- Robust implementation of all ACME challenges
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- HTTP (http-01)
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- DNS (dns-01)
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- TLS (tls-alpn-01)
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- SAN certificate support
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2022-06-16 22:25:42 +00:00
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- Comes with multiple optional [DNS providers]({{< ref "dns" >}})
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- [Custom challenge solvers]({{< ref "usage/library/Writing-a-Challenge-Solver" >}})
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2019-03-08 18:47:06 +00:00
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- Certificate bundling
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- OCSP helper function
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2022-06-16 22:25:42 +00:00
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lego introduced support for ACME v2 in [v1.0.0](https://github.com/go-acme/lego/releases/tag/v1.0.0).
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2019-03-11 16:56:48 +00:00
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If you still need to utilize ACME v1, you can do so by using the [v0.5.0](https://github.com/go-acme/lego/releases/tag/v0.5.0) version.
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