2020-07-18 08:02:40 +00:00
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---
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title: Sign Git commit with an EdDSA/Ed25519/Curve25519 key
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excerpt: Utilise a curve not produced by NIST
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date: 2020-07-18
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tags:
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- security
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- gitlab
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---
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## Generate an Ed25519 key
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```
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$ gpg --expert --full-generate-key
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Please select what kind of key you want:
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(10) ECC (sign only)
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Your selection? 10
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Please select which elliptic curve you want:
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(1) Curve 25519
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Your selection? 1
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2020-07-21 05:03:07 +00:00
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# Key shouldn't expire (in commit signing)
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2020-07-18 08:02:40 +00:00
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Please specify how long the key should be valid.
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2020-07-21 05:03:07 +00:00
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Key is valid for? (0) 0
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2020-07-18 08:02:40 +00:00
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Key expires at Sun 18 Jul 2021 00:00:00 UTC
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Is this correct? (y/N) y
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Real name: MDLeom
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## GitHub: Go to "https://github.com/settings/emails"
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# Look for "xxx@users.noreply.github.com will be used for web-based Git operations"
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## GitLab: Go to "https://gitlab.com/profile"
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# Look for "Use a private email - xxx@users.noreply.gitlab.com"
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## Must include the unique number prefix.
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Email address: 123456-curbengh@users.noreply.github.com
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# Leave the comment empty
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Comment:
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You selected this USER-ID:
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"MDLeom <123456-curbengh@users.noreply.github.com>"
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Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? o
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# It should be separate from your system password
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Enter a password to encrypt private key:
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pub ed25519 2020-07-18 [SC] [expires: 2021-07-18]
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CE44B3CFC4C68B868A7AE868D87953FAD4BB4EC4
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uid MDLeom <123456-curbengh@users.noreply.github.com>
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```
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## Export public key
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```
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## Export public key
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# Add this public key to your GitHub/GitLab account
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gpg --output public.gpg --armor --export CE44B3CFC4C68B868A7AE868D87953FAD4BB4EC4
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## Export private key for backup
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# The exported key will be encrypted with your password (that you entered during key generation)
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# Need to use the same password to import back
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gpg --output private.asc --armor --export-secret-key CE44B3CFC4C68B868A7AE868D87953FAD4BB4EC4
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```
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## Sign Git commit
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```
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# Enable commit signing in a repository folder
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$ git config user.signingkey CE44B3CFC4C68B868A7AE868D87953FAD4BB4EC4
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# Commit a change and sign it
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$ git commit -S -m "commit message"
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```
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## See also
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- [Curve25519](https://en.wikipedia.org/wiki/Curve25519#Popularity)
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- [Dual_EC_DRBG](https://en.wikipedia.org/wiki/Dual_EC_DRBG)
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