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* 仕様書

[REFS[
- [36] [CITE@en[Subresource Integrity]] ([TIME[2016-06-22 03:22:12 +09:00]]) <https://w3c.github.io/webappsec-subresource-integrity/>
- [43] [CITE@en-US-x-hixie[HTML Standard]] ([TIME[2016-11-14 20:43:54 +09:00]]) <https://html.spec.whatwg.org/#attr-link-integrity>
- [49] [CITE@en-US-x-hixie[HTML Standard]] ([TIME[2016-11-14 20:43:54 +09:00]]) <https://html.spec.whatwg.org/#the-script-element>
]REFS]

* 意味

[44] [[要素]]によって行われる[[要求]]の[F[一貫性メタデータ]]を表します。
[SRC[>>43, >>49]]

* 構文

[46] [[属性値]]は、[[テキスト]]です [SRC[>>43, >>49]]。

* 文脈

[51] [CODE(HTMLe)@en[link]] [[要素]]と [CODE(HTMLe)@en[script]]
[[要素]]に指定できます。

[45] [CODE(HTMLe)@en[link]] [[要素]]にあっては、
[CODE(HTMLa)@en[rel]] [[属性]]に [CODE(HTML)@en[stylesheet]] が指定されていない限り、
指定しては[MUST[なりません]] [SRC[>>43]]。

;; [47] それ以外では、指定しても無視されます。

[52] [CODE(HTMLe)@en[script]] [[要素]]にあっては、
[[データブロック]]や[[モジュールスクリプト]]を表す時、
あるいは [CODE(HTMLa)@en[src][<script src>]] [[属性]]がない時、
指定しては[MUST[なりません]] [SRC[>>49]]。

;; [53] [CODE[integrity][integrity=""]] は、[[古典スクリプト]]と[[モジュールスクリプト]]に適用されます。
[[データブロック]]に指定しても、無視されます。

[65] [[スクリプトfetchオプション群]]は、
[DFN[[F[[RUBYB[[[一貫性メタデータ]]]@en[integrity metadata]]]]]]を持ちます
[SRC[[CITE[HTML Standard]]]]。[[スクリプトの作成]]時に設定され、
[[スクリプトのfetch]]で参照されます。

* 処理

[48] [[obtain the resource]] で参照されます。

[54] [CODE(HTMLe)@en[script]] [[要素]]の処理で参照されます。

* IDL 属性

[50] [CODE(DOMi)@en[HTMLLinkElement]] [[インターフェイス]]の
[DFN[[CODE(DOMa)@en[integrity]]]] [[IDL属性]]は、
[CODE(HTMLa)@en[integrity]] [[内容属性]]を[[文字列]]として[[反映]]するものです
[SRC[>>43]]。

* 歴史

[SEE[ [[参照元にハッシュ値を埋め込む提案と失敗の歴史]] ]]

[11] [CITE@en[Link Hashes - WHATWG Wiki]] ([TIME[2014-10-11 21:00:37 +09:00]] 版) <https://wiki.whatwg.org/wiki/Link_Hashes>

[1] [CITE@en[Subresource Integrity]]
( ([TIME[2014-03-15 05:47:19 +09:00]] 版))
<http://www.w3.org/TR/2014/WD-SRI-20140318/>

[2] [CITE@en[Subresource Integrity]]
( ([TIME[2014-05-21 09:40:41 +09:00]] 版))
<http://w3c.github.io/webappsec/specs/subresourceintegrity/>

[3] [CITE[IRC logs: freenode / #whatwg / 20140613]]
( ([TIME[2014-06-14 11:47:11 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20140613#l-229>

[4] [CITE@en[Subresource Integrity]]
( ([TIME[2014-07-02 16:04:20 +09:00]] 版))
<http://w3c.github.io/webappsec/specs/subresourceintegrity/>

[5] [CITE@en[Fix old digest attribute · 80721db · w3c/webappsec]] ([TIME[2014-10-18 14:28:35 +09:00]] 版) <https://github.com/w3c/webappsec/commit/80721db13315f38d9a46dbd824fc2939619d50f0>

[6] [CITE@en[1100206 – Teach the parser about the integrity attribute]]
([TIME[2015-02-19 12:25:29 +09:00]] 版)
<https://bugzilla.mozilla.org/show_bug.cgi?id=1100206>

[7] [CITE@en[Changed integrity productions to reflect per-hash-expression options and... · w3c/webappsec@54e31a1]]
([TIME[2015-04-10 00:34:48 +09:00]] 版)
<https://github.com/w3c/webappsec/commit/54e31a12846eff424a018ce9d2078cfec798a888>

[8] [CITE@en[Got rid of MIME type references, other than note that they may be added ... · w3c/webappsec@beec679]]
([TIME[2015-04-10 00:34:59 +09:00]] 版)
<https://github.com/w3c/webappsec/commit/beec679207dbdd02231d6f7090833ecb2e1690cc>

[9] [CITE@en[Modified metadata algorithm to generate a set of strong hashes. · w3c/webappsec@7b00748]]
([TIME[2015-04-10 00:37:22 +09:00]] 版)
<https://github.com/w3c/webappsec/commit/7b00748ea09ca291215c8802a296ccda6c226d43>

[10] [CITE@en[Subresource Integrity]]
([TIME[2015-04-09 17:26:24 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-SRI-20150409/>

[12] [CITE@en[Subresource Integrity]]
([TIME[2015-05-05 23:26:33 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-SRI-20150505/>

[13] [CITE@en[''''''[''''''SRI'''''']'''''' Requiring CORS for SRI]]
([[Tanvi Vyas]] 著, [TIME[2015-05-07 03:17:41 +09:00]] 版)
<https://lists.w3.org/Archives/Public/public-webappsec/2015May/0023.html>

[14] [CITE[Issue 1186883003: Ship Subresource Integrity - Code Review]]
([TIME[2015-06-20 11:40:17 +09:00]] 版)
<https://codereview.chromium.org/1186883003/>

[15] [CITE@en[SRI: Shipped on tip-of-tree Chromium]]
([[Joel Weinberger]] 著, [TIME[2015-06-20 04:06:46 +09:00]] 版)
<https://lists.w3.org/Archives/Public/public-webappsec/2015Jun/0053.html>

[16] [CITE@en[Subresource Integrity]]
([TIME[2015-07-07 16:18:55 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-SRI-20150707/>

[17] [CITE@en[Support integrity. Fixes #85. · whatwg/fetch@12a1a6c]]
([TIME[2015-07-24 23:05:10 +09:00]] 版)
<https://github.com/whatwg/fetch/commit/12a1a6cc539262fb5e58717047b0fcb70b38ae26>

[18] [CITE@en[Bug 148363 – Implement Subresource Integrity (SRI)]]
([TIME[2015-08-24 11:38:53 +09:00]] 版)
<https://bugs.webkit.org/show_bug.cgi?id=148363>

[19] [CITE@en[Subresource Integrity]]
([TIME[2015-09-16 22:14:01 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-SRI-20150916/>

[FIG(quote)[
[FIGCAPTION[
[20] [CITE[IRC logs: freenode / #whatwg / 20150928]]
([TIME[2015-09-29 10:44:08 +09:00]] 版)
<http://krijnhoetmer.nl/irc-logs/whatwg/20150928>
]FIGCAPTION]

> 
> # '''['''10:44''']''' <mkwst> terinjokes: SRI only applies to those elements because the current spec is basically a test to check that we can actually verify integrity on the wild and crazy internet.
> # '''['''10:44''']''' <mkwst> terinjokes: Basically, they decided to do the simplest thing possible, make sure it works, and then expand it based on that experience.
> # '''['''10:45''']''' <mkwst> terinjokes: Tacking `integrity` attributes onto other elements as necessary is an obvious next step.

]FIG]

[21] [CITE@en[Subresource Integrity]]
([TIME[2015-10-06 22:14:42 +09:00]] 版)
<https://w3c.github.io/webappsec-subresource-integrity/>

[22] [CITE@en[w3c/webappsec-subresource-integrity]]
([TIME[2015-10-06 23:28:21 +09:00]] 版)
<https://github.com/w3c/webappsec-subresource-integrity>

[23] [CITE@en[Subresource Integrity]]
([TIME[2015-10-06 23:13:38 +09:00]] 版)
<http://www.w3.org/TR/2015/WD-SRI-20151006/>

[24] [CITE@en[Merge pull request #4 from fmarier/simplify-eligibility-alg · w3c/webappsec-subresource-integrity@f98f344]]
([TIME[2015-10-22 11:46:04 +09:00]] 版)
<https://github.com/w3c/webappsec-subresource-integrity/commit/f98f344856977a106f2660d4e75c697102f7c057>

[25] [CITE@en[Subresource Integrity]]
( ([TIME[2015-11-12 22:23:57 +09:00]] 版))
<http://www.w3.org/TR/2015/CR-SRI-20151112/>

[26] [CITE@en[Re: ''''''[''''''SRI'''''']'''''' Unmentioned use case: caching]]
([[Joel Weinberger]] 著, [TIME[2015-12-22 00:41:02 +09:00]] 版)
<https://lists.w3.org/Archives/Public/public-webappsec/2015Dec/0042.html>

[27] [CITE@en-us[Subresource Integrity - GitHub Engineering]]
([TIME[2015-12-18 00:30:15 +09:00]] 版)
<http://githubengineering.com/subresource-integrity/>

[28] [CITE@en[''''''[''''''CSP'''''']'''''' "sri" source expression to enforce SRI]]
([[Patrick Toomey]] 著, [TIME[2015-12-22 02:34:34 +09:00]] 版)
<https://lists.w3.org/Archives/Public/public-webappsec/2015Dec/0045.html>

[29] [CITE@en[Convert to Bikeshed. Should be all formatting changes, which includes… · w3c/webappsec-subresource-integrity@4b6816d]]
([TIME[2016-01-21 12:15:20 +09:00]] 版)
<https://github.com/w3c/webappsec-subresource-integrity/commit/4b6816d922587922a2b89854b384a89db6e5fd8b>

[30] [CITE@en[Allow hashes to match external scripts · w3c/webappsec-csp@a299d38]]
([TIME[2016-04-26 12:10:58 +09:00]] 版)
<https://github.com/w3c/webappsec-csp/commit/a299d38d1b54e3d9612d11fb69cc8174b5e44051>

[31] [CITE@en[Subresource Integrity]]
( ([TIME[2016-05-09 18:03:08 +09:00]]))
<https://www.w3.org/TR/2016/PR-SRI-20160510/>

[32] [CITE@en[reference `require-sri-for` in SRI specification (#93)]]
( ([[shekyan]]著, [TIME[2016-06-22 18:00:34 +09:00]]))
<https://github.com/w3c/webappsec-csp/commit/7b8762c599a5f7fa53d15df4629e763f6ed53c60>

[33] [CITE@en[Subresource Integrity]]
([TIME[2016-06-21 00:01:23 +09:00]])
<https://www.w3.org/TR/2016/REC-SRI-20160623/>

[34] [CITE@en[Subresource Integrity]]
([TIME[2016-06-21 00:01:23 +09:00]])
<https://www.w3.org/TR/2016/REC-SRI-20160623/>

[35] [CITE@en[Subresource Integrity]]
([TIME[2016-06-22 03:22:12 +09:00]])
<https://w3c.github.io/webappsec-subresource-integrity/>

[37] [CITE@en[w3c/webappsec-subresource-integrity: WebAppSec Subresource Integrity]]
([TIME[2016-06-30 12:18:52 +09:00]])
<https://github.com/w3c/webappsec-subresource-integrity>

[38] [CITE@en[GitHub implements Subresource Integrity]]
([TIME[2016-07-30 16:00:20 +09:00]])
<https://github.com/blog/2058-github-implements-subresource-integrity>

[39] [CITE@en[Subresource Integrity Addressable Caching]]
([TIME[2016-10-16 03:29:51 +09:00]])
<https://hillbrad.github.io/sri-addressable-caching/sri-addressable-caching.html>

[40] [CITE@en[Clarifying SRI integration.]]
([[mikewest]]著, [TIME[2016-11-09 22:01:27 +09:00]])
<https://github.com/w3c/webappsec-csp/commit/68aecb5003b0081afcc4f70524b81f8b381aa97c>

[41] [CITE@en[Upstream SRI's 'integrity' attribute]]
([[mikewest]]著, [TIME[2016-11-03 22:33:16 +09:00]])
<https://github.com/whatwg/html/commit/4c5066c171610e0c8300a58baf4f94816044cedc>

[42] [CITE@en[Disallow the integrity attribute for inline scripts]]
([[zcorpan]]著, [TIME[2016-11-03 22:54:48 +09:00]])
<https://github.com/whatwg/html/commit/7a405842a176c30a5d46c3520a1c8827b5483961>

[55] [CITE@en[Be clearer about the "parse metadata" algorithm.]]
([[jyasskin]]著, [TIME[2017-02-07 08:42:51 +09:00]])
<https://github.com/w3c/webappsec-subresource-integrity/commit/78e3b73832b87ca83f562cf8dd6f1ae2f5aa196e>

[56] [CITE@en[Subresource Integrity Addressable Caching]]
([TIME[2016-10-16 03:29:51 +09:00]])
<https://hillbrad.github.io/sri-addressable-caching/sri-addressable-caching.html>

[57] [CITE@en[Add signature-based explainer.]]
([[mikewest]]著, [TIME[2017-06-01 16:07:34 +09:00]])
<https://github.com/w3c/webappsec-subresource-integrity/commit/f6b778b6c9f90857b99ebcca34efb55247218b5f>

[58] [CITE@en[Proposal: Signatures in SRI.]]
([[Mike West]]著, [TIME[2017-06-01 18:13:04 +09:00]])
<https://lists.w3.org/Archives/Public/public-webappsec/2017Jun/0000.html>

[59] [CITE@en[Using integrity with "no-cors" is fine same-origin]]
([[annevk]]著, [TIME[2017-09-02 01:19:38 +09:00]])
<https://github.com/whatwg/fetch/commit/686a1ad9e1c5a001531ebabb1bcd163dfe78edd8>

[60] [CITE@en[TypeError on Request.integrity with no-cors mode is a foot gun · Issue #583 · whatwg/fetch]]
([TIME[2017-09-02 17:04:00 +09:00]])
<https://github.com/whatwg/fetch/issues/583>

[61] [CITE@en[Using integrity with "no-cors" is fine same-origin by annevk · Pull Request #584 · whatwg/fetch]]
([TIME[2017-09-02 17:04:24 +09:00]])
<https://github.com/whatwg/fetch/pull/584>

[62] [CITE@en[Add integrity="" for module scripts, and integrate dynamic import() by domenic · Pull Request #3044 · whatwg/html]]
([TIME[2017-10-04 22:46:22 +09:00]])
<https://github.com/whatwg/html/pull/3044>

[63] [CITE@en[Make integrity="" work on module scripts]]
([[domenic]]著, [TIME[2017-09-14 18:00:24 +09:00]])
<https://github.com/whatwg/html/commit/9275d955dcd604e959cfcc672e0c234b1b8c00db>

[64] [CITE@en[Make integrity="" work on module scripts]]
([[domenic]]著, [TIME[2017-09-14 18:00:24 +09:00]])
<https://github.com/whatwg/html/commit/9275d955dcd604e959cfcc672e0c234b1b8c00db>

[66] [CITE@en[Does integrity="" intentionally not work on module <script>s? · Issue #2382 · whatwg/html]]
([TIME[2017-10-05 14:16:28 +09:00]])
<https://github.com/whatwg/html/issues/2382>

[67] [CITE@en[Add integrity="" for module scripts, and integrate dynamic import() by domenic · Pull Request #3044 · whatwg/html]]
([TIME[2017-10-05 14:22:58 +09:00]])
<https://github.com/whatwg/html/pull/3044>

[68] [CITE@en[Signature-based SRI and CDNs]]
([[Mark Nottingham]]著, [TIME[2017-11-09 09:38:08 +09:00]])
<https://lists.w3.org/Archives/Public/public-webappsec/2017Nov/0014.html>

[69] [CITE@en[Re: SRI and signatures]]
([[Daniel Vogelheim]]著, [TIME[2017-12-13 01:44:10 +09:00]])
<https://lists.w3.org/Archives/Public/public-webappsec/2017Dec/0012.html>

[70] [CITE@en[Add <link> rel="modulepreload" by domenic · Pull Request #2383 · whatwg/html]]
([TIME[2018-03-20 15:20:27 +09:00]])
<https://github.com/whatwg/html/pull/2383>

[71] [CITE[New WebKit Features in Safari 11.1 | WebKit]]
([TIME[2018-04-13 13:40:37 +09:00]])
<https://webkit.org/blog/8216/new-webkit-features-in-safari-11-1/>

[72] [CITE[New WebKit Features in Safari 11.1 | WebKit]]
([TIME[2018-04-24 13:08:05 +09:00]])
<https://webkit.org/blog/8216/new-webkit-features-in-safari-11-1/>

[73] [CITE@en[Added note explaining difference between SRI and CSP hashes (#344)]]
([[andypaicu]]著, [TIME[2018-10-08 19:39:51 +09:00]])
<https://github.com/w3c/webappsec-csp/commit/24ca8417f5d1326d1c589833ba0e9e39678f4ed0>

[74] [CITE@en[Adding note explaining difference between SRI and CSP hashes by andypaicu · Pull Request #344 · w3c/webappsec-csp]]
([TIME[2018-10-30 23:50:46 +09:00]])
<https://github.com/w3c/webappsec-csp/pull/344>

[75] [CITE@en["Whitelisting external JavaScript with hashes" incorrectly assumes encoding of sources · Issue #110 · w3c/webappsec-csp]]
([TIME[2018-10-30 23:50:58 +09:00]])
<https://github.com/w3c/webappsec-csp/issues/110>

[76] [CITE@en[Revert `require-sri-for` (#82)]]
([[mozfreddyb]]著, [TIME[2019-07-03 04:43:58 +09:00]])
<https://github.com/w3c/webappsec-subresource-integrity/commit/4716b7278b553c9d5bf10ee56e00570a737ee896>

[77] [CITE@en[Revert `require-sri-for` by mozfreddyb · Pull Request #82 · w3c/webappsec-subresource-integrity]]
([TIME[2020-01-12 15:26:30 +09:00]])
<https://github.com/w3c/webappsec-subresource-integrity/pull/82>

[78] [CITE@en[SRI spec Maintenance]]
([[Frederik Braun]]著, [TIME[2019-07-02 22:30:57 +09:00]])
<https://lists.w3.org/Archives/Public/public-webappsec/2019Jul/0002.html>

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