summaryrefslogtreecommitdiff
path: root/Documentation/technical/signature-format.txt
blob: 833afff84209630c2ef4270eb26c08ffaeeb3c6d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
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
----