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Git signature format
====================

== Overview

Git uses cryptographic signatures in various places, currently objects (tags,
commits, mergetags) and transactions (pushes). In every case, the command which
is about to create an object or transaction determines a payload from that,
calls gpg to obtain a detached signature for the payload (`gpg -bsa`) and
embeds the signature into the object or transaction.

Signatures always begin with `-----BEGIN PGP SIGNATURE-----`
and end with `-----END PGP SIGNATURE-----`, unless gpg is told to
produce RFC1991 signatures which use `MESSAGE` instead of `SIGNATURE`.

The signed payload and the way the signature is embedded depends
on the type of the object resp. transaction.

== Tag signatures

- created by: `git tag -s`
- payload: annotated tag object
- embedding: append the signature to the unsigned tag object
- example: tag `signedtag` with subject `signed tag`

----
object 04b871796dc0420f8e7561a895b52484b701d51a
type commit
tag signedtag
tagger C O Mitter <committer@example.com> 1465981006 +0000

signed tag

signed tag message body
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iQEcBAABAgAGBQJXYRhOAAoJEGEJLoW3InGJklkIAIcnhL7RwEb/+QeX9enkXhxn
rxfdqrvWd1K80sl2TOt8Bg/NYwrUBw/RWJ+sg/hhHp4WtvE1HDGHlkEz3y11Lkuh
8tSxS3qKTxXUGozyPGuE90sJfExhZlW4knIQ1wt/yWqM+33E9pN4hzPqLwyrdods
q8FWEqPPUbSJXoMbRPw04S5jrLtZSsUWbRYjmJCHzlhSfFWW4eFd37uquIaLUBS0
rkC3Jrx7420jkIpgFcTI2s60uhSQLzgcCwdA2ukSYIRnjg/zDkj8+3h/GaROJ72x
lZyI6HWixKJkWw8lE9aAOD9TmTW9sFJwcVAzmAuFX2kUreDUKMZduGcoRYGpD7E=
=jpXa
-----END PGP SIGNATURE-----
----

- verify with: `git verify-tag [-v]` or `git tag -v`

----
gpg: Signature made Wed Jun 15 10:56:46 2016 CEST using RSA key ID B7227189
gpg: Good signature from "Eris Discordia <discord@example.net>"
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA  29A4 6109 2E85 B722 7189
object 04b871796dc0420f8e7561a895b52484b701d51a
type commit
tag signedtag
tagger C O Mitter <committer@example.com> 1465981006 +0000

signed tag

signed tag message body
----

== Commit signatures

- created by: `git commit -S`
- payload: commit object
- embedding: header entry `gpgsig`
  (content is preceded by a space)
- example: commit with subject `signed commit`

----
tree eebfed94e75e7760540d1485c740902590a00332
parent 04b871796dc0420f8e7561a895b52484b701d51a
author A U Thor <author@example.com> 1465981137 +0000
committer C O Mitter <committer@example.com> 1465981137 +0000
gpgsig -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1

 iQEcBAABAgAGBQJXYRjRAAoJEGEJLoW3InGJ3IwIAIY4SA6GxY3BjL60YyvsJPh/
 HRCJwH+w7wt3Yc/9/bW2F+gF72kdHOOs2jfv+OZhq0q4OAN6fvVSczISY/82LpS7
 DVdMQj2/YcHDT4xrDNBnXnviDO9G7am/9OE77kEbXrp7QPxvhjkicHNwy2rEflAA
 zn075rtEERDHr8nRYiDh8eVrefSO7D+bdQ7gv+7GsYMsd2auJWi1dHOSfTr9HIF4
 HJhWXT9d2f8W+diRYXGh4X0wYiGg6na/soXc+vdtDYBzIxanRqjg8jCAeo1eOTk1
 EdTwhcTZlI0x5pvJ3H0+4hA2jtldVtmPM4OTB0cTrEWBad7XV6YgiyuII73Ve3I=
 =jKHM
 -----END PGP SIGNATURE-----

signed commit

signed commit message body
----

- verify with: `git verify-commit [-v]` (or `git show --show-signature`)

----
gpg: Signature made Wed Jun 15 10:58:57 2016 CEST using RSA key ID B7227189
gpg: Good signature from "Eris Discordia <discord@example.net>"
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA  29A4 6109 2E85 B722 7189
tree eebfed94e75e7760540d1485c740902590a00332
parent 04b871796dc0420f8e7561a895b52484b701d51a
author A U Thor <author@example.com> 1465981137 +0000
committer C O Mitter <committer@example.com> 1465981137 +0000

signed commit

signed commit message body
----

== Mergetag signatures

- created by: `git merge` on signed tag
- payload/embedding: the whole signed tag object is embedded into
  the (merge) commit object as header entry `mergetag`
- example: merge of the signed tag `signedtag` as above

----
tree c7b1cff039a93f3600a1d18b82d26688668c7dea
parent c33429be94b5f2d3ee9b0adad223f877f174b05d
parent 04b871796dc0420f8e7561a895b52484b701d51a
author A U Thor <author@example.com> 1465982009 +0000
committer C O Mitter <committer@example.com> 1465982009 +0000
mergetag object 04b871796dc0420f8e7561a895b52484b701d51a
 type commit
 tag signedtag
 tagger C O Mitter <committer@example.com> 1465981006 +0000

 signed tag

 signed tag message body
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1

 iQEcBAABAgAGBQJXYRhOAAoJEGEJLoW3InGJklkIAIcnhL7RwEb/+QeX9enkXhxn
 rxfdqrvWd1K80sl2TOt8Bg/NYwrUBw/RWJ+sg/hhHp4WtvE1HDGHlkEz3y11Lkuh
 8tSxS3qKTxXUGozyPGuE90sJfExhZlW4knIQ1wt/yWqM+33E9pN4hzPqLwyrdods
 q8FWEqPPUbSJXoMbRPw04S5jrLtZSsUWbRYjmJCHzlhSfFWW4eFd37uquIaLUBS0
 rkC3Jrx7420jkIpgFcTI2s60uhSQLzgcCwdA2ukSYIRnjg/zDkj8+3h/GaROJ72x
 lZyI6HWixKJkWw8lE9aAOD9TmTW9sFJwcVAzmAuFX2kUreDUKMZduGcoRYGpD7E=
 =jpXa
 -----END PGP SIGNATURE-----

Merge tag 'signedtag' into downstream

signed tag

signed tag message body

# gpg: Signature made Wed Jun 15 08:56:46 2016 UTC using RSA key ID B7227189
# gpg: Good signature from "Eris Discordia <discord@example.net>"
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA  29A4 6109 2E85 B722 7189
----

- verify with: verification is embedded in merge commit message by default,
  alternatively with `git show --show-signature`:

----
commit 9863f0c76ff78712b6800e199a46aa56afbcbd49
merged tag 'signedtag'
gpg: Signature made Wed Jun 15 10:56:46 2016 CEST using RSA key ID B7227189
gpg: Good signature from "Eris Discordia <discord@example.net>"
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA  29A4 6109 2E85 B722 7189
Merge: c33429b 04b8717
Author: A U Thor <author@example.com>
Date:   Wed Jun 15 09:13:29 2016 +0000

    Merge tag 'signedtag' into downstream

    signed tag

    signed tag message body

    # gpg: Signature made Wed Jun 15 08:56:46 2016 UTC using RSA key ID B7227189
    # gpg: Good signature from "Eris Discordia <discord@example.net>"
    # gpg: WARNING: This key is not certified with a trusted signature!
    # gpg:          There is no indication that the signature belongs to the owner.
    # Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA  29A4 6109 2E85 B722 7189
----
Anon7 - 2022
AnonSec Team