Certificate Renew protocol

From: Kaiduan Xie <kaiduanx@xxxxxxxxx>
To: "Let's Encrypt Client Development" <client-dev@xxxxxxxxxxxxxxx>, "Let's Encrypt CA Development" <ca-dev@xxxxxxxxxxxxxxx>
Date: Mon, 15 Feb 2016 10:00:50 -0500
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Hi all,

What is the protocol/procedure used under the hood to renew a Letsencrypt
certificate? I obtained an Letsencrypt certificate on Dec of 2015 with my
own client (not the Python client provided by Letsencrypt), the certificate
is going to expire soon.

Unfortunately the IETF draft
https://tools.ietf.org/html/draft-barnes-acme-04 does not explain the renew
procedure and protocol.

Now the following informations are available after obtaining a Letsencrypt
certificate.

1. Account RSA key pair
2. RSA key pair for Letsencrypt issued certificate
3. CSR for Letsencrypt issued certificate
4. Letsencrypt issued certificate
5. URL for Letsencrypt issued certificate
6. Domain name

Can someone elaborate the renew protocol in details? How the above
informations are used to renew a certificate?

Thanks a lot for the help,

/Kaiduan

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