How to install sw-nginx-module-handshake-padding on Debian

TLS 1.3 handshake record padding against ECH vhost fingerprinting

Vendor: GetPageSpeed https://github.com/GetPageSpeed/ngx_ssl_handshake_padding

Availability

Compare package tracks by distribution and architecture. Checkmarks show the architectures available in each repository channel.

Distro	Channel	amd64	Version
Debian 13 (trixie)	Base		1.30.6.1+1.0.0+p18.0.82.1.t261027.1716
Debian 12 (bookworm)	Base		1.30.6.1+1.0.0+p18.0.82.1.t261027.1716

Description

Pads outgoing TLS 1.3 handshake records to a multiple of a configured block size, so that virtual hosts sharing an ECH (Encrypted Client Hello) listener cannot be told apart by the exact record sizes of their encrypted server handshake flight. This is the server-side mitigation RFC 9849 section 6.1.3 calls for: without it, a single byte of certificate difference uniquely identifies a vhost behind an ECH cover. One directive: ssl_handshake_padding (default off, recommended 512). Zero application-data overhead, KTLS-compatible; requires nginx running against OpenSSL 3.4+; HTTP/3 handshakes are not covered by the underlying OpenSSL API.

Built for Debian.

Install

Base Debian 12, 13

sw-nginx-module-handshake-padding on Debian 12 (bookworm), 13 (trixie)

curl -fsSL https://extras.getpagespeed.com/release-latest.deb -o /tmp/getpagespeed-release.deb
sudo apt-get install -y /tmp/getpagespeed-release.deb
rm /tmp/getpagespeed-release.deb
sudo apt-get update
sudo apt-get install -y sw-nginx-module-handshake-padding

Frequently asked questions

How do I install sw-nginx-module-handshake-padding on Debian?

Add the GetPageSpeed repository, then install the sw-nginx-module-handshake-padding package with your system package manager.

Which Debian versions is sw-nginx-module-handshake-padding available for?

sw-nginx-module-handshake-padding is available for Debian 12, 13.