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125 lines
4 KiB
Markdown
125 lines
4 KiB
Markdown
---
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title: "Renewing my GPG Keys"
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date: 2023-12-28T11:46:33-05:00
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draft: false
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tags: []
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math: false
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medium_enabled: false
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---
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Recently I let my GPG keys expire. I noticed this when I was working on a project, and when I went to [automatically sign my commits](/blog/signingcommits/) -- git threw an error at me. Since I was working at the time, I did the not-so-great practice of disabling the signing feature.
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Having keys automatically expire is annoying. Though, it does give me a chance to reflect if these keys are still useful to me. Currently I use GPG keys for:
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- Code signing
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- Receiving encrypted messages
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- [Decentralized Identity](/blog/decentralized-identity-pgp-keyoxide/)
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So to me, having a GPG key is still worth it. Now to go about renewing my keys. This post will show how I go about the renewing process itself and what services I update. Mostly for me in the future.
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## Renewing my GPG key
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First, find your key
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```bash
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gpg --list-keys
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```
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```
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/home/brandon/.gnupg/pubring.kbx
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------------------------------
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pub ed25519 2022-12-14 [SC] [expires: 2023-12-14]
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5F37830BFA46FF7881F47AC78DF79C3DC5FC658A
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uid [ultimate] Brandon Rozek <brozek@brandonrozek.com>
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uid [ultimate] Brandon Rozek <hello@brandonrozek.com>
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sub cv25519 2022-12-14 [E] [expires: 2023-12-14]
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sub dsa2048 2022-12-17 [S] [expires: 2023-12-14]
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```
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The fingerprint is the line below `pub` and for me starts with `5F37`. Let's store that in a variable for easy reference later.
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```bash
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export FPR=5F37830BFA46FF7881F47AC78DF79C3DC5FC658A
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```
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If we want to extend the expiration date to a year from today, we can use the following command:
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```bash
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gpg --quick-set-expire $FPR 1y
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```
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Alternatively, you can specify an exact date with the ISO format `YYYY-MM-DD` or keep it relative with respect to days `d`, weeks `w`, and months `m`.
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When we check the key again, we should see an updated expiration date
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```bash
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gpg --list-keys
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```
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```
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/home/brandon/.gnupg/pubring.kbx
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------------------------------
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pub ed25519 2022-12-14 [SC] [expires: 2024-12-28]
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5F37830BFA46FF7881F47AC78DF79C3DC5FC658A
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uid [ultimate] Brandon Rozek <brozek@brandonrozek.com>
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uid [ultimate] Brandon Rozek <hello@brandonrozek.com>
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sub cv25519 2022-12-14 [E] [expires: 2023-12-14]
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sub dsa2048 2022-12-17 [S] [expires: 2023-12-14]
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```
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Notice that the two subkeys still have the old expiration date. We'll need to update that as well. We'll need to get their fingergrints with the following command
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```bash
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gpg --list-keys --verbose --with-subkey-fingerprints
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```
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```
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gpg: enabled compatibility flags:
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gpg: using pgp trust model
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/home/rozek/.gnupg/pubring.kbx
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------------------------------
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pub ed25519 2022-12-14 [SC] [expires: 2024-12-27]
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5F37830BFA46FF7881F47AC78DF79C3DC5FC658A
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uid [ultimate] Brandon Rozek <brozek@brandonrozek.com>
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uid [ultimate] Brandon Rozek <hello@brandonrozek.com>
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sub cv25519 2022-12-14 [E] [expires: 2023-12-14]
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D502A12A65F9997DAE4609C97DAEAD7BFFA8F9D3
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sub dsa2048 2022-12-17 [S] [expires: 2023-12-14]
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89859D1EDF70D6DC2F6BFFF226E457DA82C9F480
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```
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Store the fingerprints again for easy reference:
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```bash
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export SFPR1=D502A12A65F9997DAE4609C97DAEAD7BFFA8F9D3
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export SFPR2=89859D1EDF70D6DC2F6BFFF226E457DA82C9F480
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```
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Extend the expiration of the subkeys:
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```bash
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gpg --quick-set-expire $FPR 1y $SFPR1
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gpg --quick-set-expire $FPR 1y $SFPR2
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```
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## Updating Services
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I currently allow for two ways to query my keys: OpenGPG keyserver and WKD. To update my keys on my own WKD keyserver, I followed the steps in my [tutorial on WKD](/blog/decentralized-pgp-keys-wkd).
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For OpenGPG, I followed the instructions on their [usage page](https://keys.openpgp.org/about/usage):
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```bash
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gpg --export your_address@example.net | curl -T - https://keys.openpgp.org
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```
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## References
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https://www.gnupg.org/documentation/manuals/gnupg24/gpg.1.html
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https://whynothugo.nl/journal/2023/07/13/extending-an-expired-gpg-key/
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https://brandonrozek.com/blog/decentralized-pgp-keys-wkd/
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https://keys.openpgp.org/about/usage
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