How to install openssl35-libs on Debian

Shared libraries for openssl35 (OpenSSL 3.5 LTS with ECH)

Vendor: GetPageSpeed LLC https://github.com/openssl/openssl

Availability

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

Distro	Channel	amd64	arm64	Version
Debian 13 (trixie)	Base			3.5.8
Debian 12 (bookworm)	Base			3.5.8

Description

An ABI-isolated build of the OpenSSL 3.5 LTS line carrying the Encrypted Client Hello (ECH, RFC 9849) backport from the DEfO project, plus TLS certificate compression (zlib, brotli, zstd), kTLS and post-quantum key exchange (X25519MLKEM768). It is installed alongside the system OpenSSL and does not replace libssl3. This package provides the shared libraries libssl.so.35.3 and libcrypto.so.35.3, along with engine and provider modules, installed under /usr/lib//openssl35/. The renamed SONAMEs guarantee a process can never accidentally resolve these symbols against the system libssl.so.3, even when both are loaded. An ld.so.conf.d snippet is shipped so the runtime linker can find them without rpath.

Built for Debian.

Install

Base Debian 12, 13

openssl35-libs 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 openssl35-libs

Frequently asked questions

How do I install openssl35-libs on Debian?

Add the GetPageSpeed repository, then install the openssl35-libs package with your system package manager.

Which Debian versions is openssl35-libs available for?

openssl35-libs is available for Debian 12, 13.