Contact emailsdadr...@google.com

ExplainerNone

Specificationhttps://www.rfc-editor.org/rfc/rfc9155.html

Summary

Chrome is removing support for signature algorithms using SHA-1 for server
signatures during the TLS handshake. This does not affect SHA-1 support in
server certificates, which was already removed, or in client certificates,
which continues to be supported. SHA-1 can be temporarily re-enabled via
the temporary InsecureHashesInTLSHandshakesEnabled enterprise policy. This
policy will be removed in Chrome 123.


Blink componentInternals>Network>SSL
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Internals%3ENetwork%3ESSL>

Search tagstls <https://chromestatus.com/features#tags:tls>, ssl
<https://chromestatus.com/features#tags:ssl>, sha1
<https://chromestatus.com/features#tags:sha1>

TAG reviewNone

TAG review statusNot applicable

Risks


Interoperability and Compatibility

At most 0.02% of page loads use the SHA1 fallback. However, we cannot
disambiguate between a flaky first connection, and actually requiring SHA1.
We expect the actual amount is lower.


*Gecko*: Positive (https://github.com/mozilla/standards-positions/issues/812
)

*WebKit*: Positive (https://github.com/WebKit/standards-positions/issues/196
)

*Web developers*: No signals

*Other signals*:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that
it has potentially high risk for Android WebView-based applications?

None


Debuggability

n/a, this happens pre-devtools


Will this feature be supported on all six Blink platforms (Windows, Mac,
Linux, Chrome OS, Android, and Android WebView)?Yes

Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?No

Flag name on chrome://flagsuse-sha1-server-handshakes

Finch feature nameDisableSHA1ServerSignature

Requires code in //chrome?False

Tracking bughttps://bugs.chromium.org/p/chromium/issues/detail?id=658905

Launch bughttps://launch.corp.google.com/launch/4233200

Estimated milestones
Shipping on desktop 117
OriginTrial desktop last 116
OriginTrial desktop first 115
DevTrial on desktop 115
Shipping on Android 117
OriginTrial Android last 116
OriginTrial Android first 115
DevTrial on Android 115
OriginTrial webView last 116
OriginTrial webView first 115

Anticipated spec changes

Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github issues
in the project for the feature specification) whose resolution may
introduce web compat/interop risk (e.g., changing to naming or structure of
the API in a non-backward-compatible way).
None

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/4832850040324096

Links to previous Intent discussionsIntent to Experiment:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAGkh42JZz%3De_TRVwumqgTj-A7543BR7JLBUR_GzVN_oOWhKVvg%40mail.gmail.com


This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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