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Expose C2S/S2C session keys from the KE handshake#566

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sofiascalzo wants to merge 1 commit into
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sofiascalzo:export-D113419245
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Expose C2S/S2C session keys from the KE handshake#566
sofiascalzo wants to merge 1 commit into
facebook:mainfrom
sofiascalzo:export-D113419245

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Summary:
The KE handshake already derived the TLS-exporter session keys but threw them
away, leaving a client no way to sign NTPv4 requests or verify responses. Return
them from the handshake so the upcoming NTS NTPv4 client can use them. They are
derived with the same exporter inputs as the server, so both ends agree.

Reviewed By: vvfedorenko

Differential Revision: D113419245

Summary:
The KE handshake already derived the TLS-exporter session keys but threw them
away, leaving a client no way to sign NTPv4 requests or verify responses. Return
them from the handshake so the upcoming NTS NTPv4 client can use them. They are
derived with the same exporter inputs as the server, so both ends agree.

Reviewed By: vvfedorenko

Differential Revision: D113419245
@meta-cla meta-cla Bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Jul 24, 2026
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meta-codesync Bot commented Jul 24, 2026

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@sofiascalzo has exported this pull request. If you are a Meta employee, you can view the originating Diff in D113419245.

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meta-codesync Bot commented Jul 24, 2026

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This pull request has been merged in 629aed4.

@meta-codesync meta-codesync Bot added the Merged label Jul 24, 2026
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