2016-06-17 09:46:08 +02:00
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Git signature format
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====================
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== Overview
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Git uses cryptographic signatures in various places, currently objects (tags,
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commits, mergetags) and transactions (pushes). In every case, the command which
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is about to create an object or transaction determines a payload from that,
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calls gpg to obtain a detached signature for the payload (`gpg -bsa`) and
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embeds the signature into the object or transaction.
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Signatures always begin with `-----BEGIN PGP SIGNATURE-----`
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and end with `-----END PGP SIGNATURE-----`, unless gpg is told to
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produce RFC1991 signatures which use `MESSAGE` instead of `SIGNATURE`.
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The signed payload and the way the signature is embedded depends
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on the type of the object resp. transaction.
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2016-06-17 09:46:09 +02:00
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== Tag signatures
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- created by: `git tag -s`
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- payload: annotated tag object
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- embedding: append the signature to the unsigned tag object
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- example: tag `signedtag` with subject `signed tag`
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----
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object 04b871796dc0420f8e7561a895b52484b701d51a
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type commit
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tag signedtag
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tagger C O Mitter <committer@example.com> 1465981006 +0000
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signed tag
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signed tag message body
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-----BEGIN PGP SIGNATURE-----
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Version: GnuPG v1
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iQEcBAABAgAGBQJXYRhOAAoJEGEJLoW3InGJklkIAIcnhL7RwEb/+QeX9enkXhxn
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rxfdqrvWd1K80sl2TOt8Bg/NYwrUBw/RWJ+sg/hhHp4WtvE1HDGHlkEz3y11Lkuh
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8tSxS3qKTxXUGozyPGuE90sJfExhZlW4knIQ1wt/yWqM+33E9pN4hzPqLwyrdods
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q8FWEqPPUbSJXoMbRPw04S5jrLtZSsUWbRYjmJCHzlhSfFWW4eFd37uquIaLUBS0
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rkC3Jrx7420jkIpgFcTI2s60uhSQLzgcCwdA2ukSYIRnjg/zDkj8+3h/GaROJ72x
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lZyI6HWixKJkWw8lE9aAOD9TmTW9sFJwcVAzmAuFX2kUreDUKMZduGcoRYGpD7E=
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=jpXa
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-----END PGP SIGNATURE-----
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----
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- verify with: `git verify-tag [-v]` or `git tag -v`
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----
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gpg: Signature made Wed Jun 15 10:56:46 2016 CEST using RSA key ID B7227189
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gpg: Good signature from "Eris Discordia <discord@example.net>"
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gpg: WARNING: This key is not certified with a trusted signature!
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gpg: There is no indication that the signature belongs to the owner.
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Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189
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object 04b871796dc0420f8e7561a895b52484b701d51a
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type commit
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tag signedtag
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tagger C O Mitter <committer@example.com> 1465981006 +0000
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signed tag
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signed tag message body
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----
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2016-06-17 09:46:10 +02:00
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== Commit signatures
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- created by: `git commit -S`
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- payload: commit object
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- embedding: header entry `gpgsig`
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(content is preceded by a space)
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- example: commit with subject `signed commit`
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----
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tree eebfed94e75e7760540d1485c740902590a00332
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parent 04b871796dc0420f8e7561a895b52484b701d51a
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author A U Thor <author@example.com> 1465981137 +0000
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committer C O Mitter <committer@example.com> 1465981137 +0000
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gpgsig -----BEGIN PGP SIGNATURE-----
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Version: GnuPG v1
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iQEcBAABAgAGBQJXYRjRAAoJEGEJLoW3InGJ3IwIAIY4SA6GxY3BjL60YyvsJPh/
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HRCJwH+w7wt3Yc/9/bW2F+gF72kdHOOs2jfv+OZhq0q4OAN6fvVSczISY/82LpS7
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DVdMQj2/YcHDT4xrDNBnXnviDO9G7am/9OE77kEbXrp7QPxvhjkicHNwy2rEflAA
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zn075rtEERDHr8nRYiDh8eVrefSO7D+bdQ7gv+7GsYMsd2auJWi1dHOSfTr9HIF4
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HJhWXT9d2f8W+diRYXGh4X0wYiGg6na/soXc+vdtDYBzIxanRqjg8jCAeo1eOTk1
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EdTwhcTZlI0x5pvJ3H0+4hA2jtldVtmPM4OTB0cTrEWBad7XV6YgiyuII73Ve3I=
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=jKHM
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-----END PGP SIGNATURE-----
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signed commit
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signed commit message body
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----
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- verify with: `git verify-commit [-v]` (or `git show --show-signature`)
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----
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gpg: Signature made Wed Jun 15 10:58:57 2016 CEST using RSA key ID B7227189
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gpg: Good signature from "Eris Discordia <discord@example.net>"
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gpg: WARNING: This key is not certified with a trusted signature!
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gpg: There is no indication that the signature belongs to the owner.
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Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189
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tree eebfed94e75e7760540d1485c740902590a00332
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parent 04b871796dc0420f8e7561a895b52484b701d51a
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author A U Thor <author@example.com> 1465981137 +0000
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committer C O Mitter <committer@example.com> 1465981137 +0000
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signed commit
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signed commit message body
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----
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