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20516890 ÆAB |
1 | gitformat-signature(5) |
2 | ====================== | |
76f9d8ba | 3 | |
20516890 ÆAB |
4 | NAME |
5 | ---- | |
6 | gitformat-signature - Git cryptographic signature formats | |
7 | ||
8 | SYNOPSIS | |
9 | -------- | |
10 | [verse] | |
11 | <[tag|commit] object header(s)> | |
12 | <over-the-wire protocol> | |
13 | ||
14 | DESCRIPTION | |
15 | ----------- | |
76f9d8ba MG |
16 | |
17 | Git uses cryptographic signatures in various places, currently objects (tags, | |
18 | commits, mergetags) and transactions (pushes). In every case, the command which | |
19 | is about to create an object or transaction determines a payload from that, | |
20 | calls gpg to obtain a detached signature for the payload (`gpg -bsa`) and | |
21 | embeds the signature into the object or transaction. | |
22 | ||
23 | Signatures always begin with `-----BEGIN PGP SIGNATURE-----` | |
24 | and end with `-----END PGP SIGNATURE-----`, unless gpg is told to | |
25 | produce RFC1991 signatures which use `MESSAGE` instead of `SIGNATURE`. | |
26 | ||
f6c013df JH |
27 | Signatures sometimes appear as a part of the normal payload |
28 | (e.g. a signed tag has the signature block appended after the payload | |
29 | that the signature applies to), and sometimes appear in the value of | |
30 | an object header (e.g. a merge commit that merged a signed tag would | |
31 | have the entire tag contents on its "mergetag" header). In the case | |
32 | of the latter, the usual multi-line formatting rule for object | |
33 | headers applies. I.e. the second and subsequent lines are prefixed | |
34 | with a SP to signal that the line is continued from the previous | |
35 | line. | |
36 | ||
37 | This is even true for an originally empty line. In the following | |
38 | examples, the end of line that ends with a whitespace letter is | |
39 | highlighted with a `$` sign; if you are trying to recreate these | |
40 | example by hand, do not cut and paste them---they are there | |
41 | primarily to highlight extra whitespace at the end of some lines. | |
42 | ||
76f9d8ba MG |
43 | The signed payload and the way the signature is embedded depends |
44 | on the type of the object resp. transaction. | |
5f1abfeb MG |
45 | |
46 | == Tag signatures | |
47 | ||
48 | - created by: `git tag -s` | |
49 | - payload: annotated tag object | |
50 | - embedding: append the signature to the unsigned tag object | |
51 | - example: tag `signedtag` with subject `signed tag` | |
52 | ||
53 | ---- | |
54 | object 04b871796dc0420f8e7561a895b52484b701d51a | |
55 | type commit | |
56 | tag signedtag | |
57 | tagger C O Mitter <committer@example.com> 1465981006 +0000 | |
58 | ||
59 | signed tag | |
60 | ||
61 | signed tag message body | |
62 | -----BEGIN PGP SIGNATURE----- | |
63 | Version: GnuPG v1 | |
64 | ||
65 | iQEcBAABAgAGBQJXYRhOAAoJEGEJLoW3InGJklkIAIcnhL7RwEb/+QeX9enkXhxn | |
66 | rxfdqrvWd1K80sl2TOt8Bg/NYwrUBw/RWJ+sg/hhHp4WtvE1HDGHlkEz3y11Lkuh | |
67 | 8tSxS3qKTxXUGozyPGuE90sJfExhZlW4knIQ1wt/yWqM+33E9pN4hzPqLwyrdods | |
68 | q8FWEqPPUbSJXoMbRPw04S5jrLtZSsUWbRYjmJCHzlhSfFWW4eFd37uquIaLUBS0 | |
69 | rkC3Jrx7420jkIpgFcTI2s60uhSQLzgcCwdA2ukSYIRnjg/zDkj8+3h/GaROJ72x | |
70 | lZyI6HWixKJkWw8lE9aAOD9TmTW9sFJwcVAzmAuFX2kUreDUKMZduGcoRYGpD7E= | |
71 | =jpXa | |
72 | -----END PGP SIGNATURE----- | |
73 | ---- | |
74 | ||
75 | - verify with: `git verify-tag [-v]` or `git tag -v` | |
76 | ||
77 | ---- | |
78 | gpg: Signature made Wed Jun 15 10:56:46 2016 CEST using RSA key ID B7227189 | |
79 | gpg: Good signature from "Eris Discordia <discord@example.net>" | |
80 | gpg: WARNING: This key is not certified with a trusted signature! | |
81 | gpg: There is no indication that the signature belongs to the owner. | |
82 | Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189 | |
83 | object 04b871796dc0420f8e7561a895b52484b701d51a | |
84 | type commit | |
85 | tag signedtag | |
86 | tagger C O Mitter <committer@example.com> 1465981006 +0000 | |
87 | ||
88 | signed tag | |
89 | ||
90 | signed tag message body | |
91 | ---- | |
eda2f11e MG |
92 | |
93 | == Commit signatures | |
94 | ||
95 | - created by: `git commit -S` | |
96 | - payload: commit object | |
97 | - embedding: header entry `gpgsig` | |
98 | (content is preceded by a space) | |
99 | - example: commit with subject `signed commit` | |
100 | ||
101 | ---- | |
102 | tree eebfed94e75e7760540d1485c740902590a00332 | |
103 | parent 04b871796dc0420f8e7561a895b52484b701d51a | |
104 | author A U Thor <author@example.com> 1465981137 +0000 | |
105 | committer C O Mitter <committer@example.com> 1465981137 +0000 | |
106 | gpgsig -----BEGIN PGP SIGNATURE----- | |
107 | Version: GnuPG v1 | |
f6c013df | 108 | $ |
eda2f11e MG |
109 | iQEcBAABAgAGBQJXYRjRAAoJEGEJLoW3InGJ3IwIAIY4SA6GxY3BjL60YyvsJPh/ |
110 | HRCJwH+w7wt3Yc/9/bW2F+gF72kdHOOs2jfv+OZhq0q4OAN6fvVSczISY/82LpS7 | |
111 | DVdMQj2/YcHDT4xrDNBnXnviDO9G7am/9OE77kEbXrp7QPxvhjkicHNwy2rEflAA | |
112 | zn075rtEERDHr8nRYiDh8eVrefSO7D+bdQ7gv+7GsYMsd2auJWi1dHOSfTr9HIF4 | |
113 | HJhWXT9d2f8W+diRYXGh4X0wYiGg6na/soXc+vdtDYBzIxanRqjg8jCAeo1eOTk1 | |
114 | EdTwhcTZlI0x5pvJ3H0+4hA2jtldVtmPM4OTB0cTrEWBad7XV6YgiyuII73Ve3I= | |
115 | =jKHM | |
116 | -----END PGP SIGNATURE----- | |
117 | ||
118 | signed commit | |
119 | ||
120 | signed commit message body | |
121 | ---- | |
122 | ||
123 | - verify with: `git verify-commit [-v]` (or `git show --show-signature`) | |
124 | ||
125 | ---- | |
126 | gpg: Signature made Wed Jun 15 10:58:57 2016 CEST using RSA key ID B7227189 | |
127 | gpg: Good signature from "Eris Discordia <discord@example.net>" | |
128 | gpg: WARNING: This key is not certified with a trusted signature! | |
129 | gpg: There is no indication that the signature belongs to the owner. | |
130 | Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189 | |
131 | tree eebfed94e75e7760540d1485c740902590a00332 | |
132 | parent 04b871796dc0420f8e7561a895b52484b701d51a | |
133 | author A U Thor <author@example.com> 1465981137 +0000 | |
134 | committer C O Mitter <committer@example.com> 1465981137 +0000 | |
135 | ||
136 | signed commit | |
137 | ||
138 | signed commit message body | |
139 | ---- | |
cc6ee97c MG |
140 | |
141 | == Mergetag signatures | |
142 | ||
143 | - created by: `git merge` on signed tag | |
144 | - payload/embedding: the whole signed tag object is embedded into | |
145 | the (merge) commit object as header entry `mergetag` | |
146 | - example: merge of the signed tag `signedtag` as above | |
147 | ||
148 | ---- | |
149 | tree c7b1cff039a93f3600a1d18b82d26688668c7dea | |
150 | parent c33429be94b5f2d3ee9b0adad223f877f174b05d | |
151 | parent 04b871796dc0420f8e7561a895b52484b701d51a | |
152 | author A U Thor <author@example.com> 1465982009 +0000 | |
153 | committer C O Mitter <committer@example.com> 1465982009 +0000 | |
154 | mergetag object 04b871796dc0420f8e7561a895b52484b701d51a | |
155 | type commit | |
156 | tag signedtag | |
157 | tagger C O Mitter <committer@example.com> 1465981006 +0000 | |
f6c013df | 158 | $ |
cc6ee97c | 159 | signed tag |
f6c013df | 160 | $ |
cc6ee97c MG |
161 | signed tag message body |
162 | -----BEGIN PGP SIGNATURE----- | |
163 | Version: GnuPG v1 | |
f6c013df | 164 | $ |
cc6ee97c MG |
165 | iQEcBAABAgAGBQJXYRhOAAoJEGEJLoW3InGJklkIAIcnhL7RwEb/+QeX9enkXhxn |
166 | rxfdqrvWd1K80sl2TOt8Bg/NYwrUBw/RWJ+sg/hhHp4WtvE1HDGHlkEz3y11Lkuh | |
167 | 8tSxS3qKTxXUGozyPGuE90sJfExhZlW4knIQ1wt/yWqM+33E9pN4hzPqLwyrdods | |
168 | q8FWEqPPUbSJXoMbRPw04S5jrLtZSsUWbRYjmJCHzlhSfFWW4eFd37uquIaLUBS0 | |
169 | rkC3Jrx7420jkIpgFcTI2s60uhSQLzgcCwdA2ukSYIRnjg/zDkj8+3h/GaROJ72x | |
170 | lZyI6HWixKJkWw8lE9aAOD9TmTW9sFJwcVAzmAuFX2kUreDUKMZduGcoRYGpD7E= | |
171 | =jpXa | |
172 | -----END PGP SIGNATURE----- | |
173 | ||
174 | Merge tag 'signedtag' into downstream | |
175 | ||
176 | signed tag | |
177 | ||
178 | signed tag message body | |
179 | ||
180 | # gpg: Signature made Wed Jun 15 08:56:46 2016 UTC using RSA key ID B7227189 | |
181 | # gpg: Good signature from "Eris Discordia <discord@example.net>" | |
182 | # gpg: WARNING: This key is not certified with a trusted signature! | |
183 | # gpg: There is no indication that the signature belongs to the owner. | |
184 | # Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189 | |
185 | ---- | |
186 | ||
187 | - verify with: verification is embedded in merge commit message by default, | |
188 | alternatively with `git show --show-signature`: | |
189 | ||
190 | ---- | |
191 | commit 9863f0c76ff78712b6800e199a46aa56afbcbd49 | |
192 | merged tag 'signedtag' | |
193 | gpg: Signature made Wed Jun 15 10:56:46 2016 CEST using RSA key ID B7227189 | |
194 | gpg: Good signature from "Eris Discordia <discord@example.net>" | |
195 | gpg: WARNING: This key is not certified with a trusted signature! | |
196 | gpg: There is no indication that the signature belongs to the owner. | |
197 | Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189 | |
198 | Merge: c33429b 04b8717 | |
199 | Author: A U Thor <author@example.com> | |
200 | Date: Wed Jun 15 09:13:29 2016 +0000 | |
201 | ||
202 | Merge tag 'signedtag' into downstream | |
203 | ||
204 | signed tag | |
205 | ||
206 | signed tag message body | |
207 | ||
208 | # gpg: Signature made Wed Jun 15 08:56:46 2016 UTC using RSA key ID B7227189 | |
209 | # gpg: Good signature from "Eris Discordia <discord@example.net>" | |
210 | # gpg: WARNING: This key is not certified with a trusted signature! | |
211 | # gpg: There is no indication that the signature belongs to the owner. | |
212 | # Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189 | |
213 | ---- | |
20516890 ÆAB |
214 | |
215 | GIT | |
216 | --- | |
217 | Part of the linkgit:git[1] suite |