# libotr mit Homebrew, apk, dnf, MacPorts, Nix, pacman, apt, zypper installieren Prüfe Installationswege, Executables, Metadaten und Sicherheitshinweise für libotr in AI-Agent-Workflows. ## Installation ```sh sudo av install brew:libotr ``` Weitere Installationsbefehle: ### macOS - Homebrew (100%): ```sh brew install libotr ``` Evidenz: local Homebrew formula metadata - MacPorts (94%): ```sh sudo port install libotr ``` Evidenz: MacPorts ports tree: security/libotr/Portfile from https://api.github.com/repos/macports/macports-ports/git/trees/master?recursive=1 ### Linux - apk (92%): ```sh sudo apk add libotr ``` Evidenz: Alpine Linux edge package indexes: libotr from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz - dnf (92%): ```sh sudo dnf install libotr ``` Evidenz: Fedora Rawhide package metadata: libotr from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/07190dc5ae9f35ae73866675fed6d95fe6e8d9fe22c9d7cdf85862cb2ed24a4c-primary.xml.zst - Nix (92%): ```sh nix profile install nixpkgs#libotr ``` Evidenz: nixpkgs package indexes: pkgs/by-name/li/libotr/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 - pacman (92%): ```sh sudo pacman -S libotr ``` Evidenz: Arch Linux sync databases: libotr from https://geo.mirror.pkgbuild.com/extra/os/x86_64/extra.db.tar.gz - Debian apt (92%): ```sh sudo apt install libotr5-bin ``` Evidenz: Debian stable package indexes: libotr5-bin from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz - zypper (92%): ```sh sudo zypper install libotr-devel ``` Evidenz: openSUSE Tumbleweed package metadata: libotr-devel from https://download.opensuse.org/tumbleweed/repo/oss/repodata/50b07339cb64c8ed4091bdbabddadc1ff5737b090e478818a195b40d8a3292861a879139b4a3987c31109699fde9fbf4a716367ddf4eef77da75f96e3193d6ed-primary.xml.zst ## Paketfakten - **Paketschlüssel:** brew:libotr - **Paketmanager:** Homebrew - **Version:** 4.1.1 - **Quellzusammenfassung:** Off-The-Record (OTR) messaging library - **Homepage:** - **Generiert:** 2026-08-03T19:37:03+00:00 ## Executables - otr_mackey (Alias) - otr_modify (Alias) - otr_parse (Alias) - otr_readforge (Alias) - otr_remac (Alias) - otr_sesskeys (Alias) ## Installationsverhalten - Bottle: nicht verfügbar ## Version und Aktualität - Seite generiert: 2026-08-03 - Manager-Version: 4.1.1 ## Projektgeschichte und Nutzung libotr is the portable C library and toolkit for Off-the-Record Messaging, a protocol for private instant-messaging conversations with encryption, authentication during the conversation, deniability after the fact, and perfect forward secrecy. ### Projektgeschichte OTR came from academic and cypherpunk work on making instant messaging behave more like an off-the-record conversation than signed email. The official OTR site links the library, the Pidgin plugin, protocol descriptions, and the original research papers as one software-and-protocol family. libotr served as the reference C implementation for client developers. The project paired the LGPL library with GPL toolkit programs and with pidgin-otr, making it practical for multiprotocol IM clients to add OTR without each client reimplementing the cryptographic state machine. ### Adoptionsgeschichte OTR became especially associated with desktop XMPP and multiprotocol IM clients. XMPP Extension Protocol 0364 described OTR as the de facto standard for end-to-end encryption in XMPP, while the OTR site maintained user-facing downloads for pidgin-otr, source repositories, protocol documents, and implementation lists. ### Wie es verwendet wird Applications link libotr to negotiate OTR sessions, run the authenticated key exchange, encrypt and authenticate data messages, and expose higher-level verification flows such as the Socialist Millionaires' Protocol. The Homebrew package also installs toolkit programs for inspecting, modifying, and testing OTR message artifacts. ### Warum Paket-Nerds sich dafür interessieren libotr matters because it is a small library package carrying a big protocol story: it let package managers deliver interoperable deniable encryption to chat clients before modern app-specific encrypted messengers became dominant. Its 2016 security release also shows why distro maintainers cared about keeping even niche crypto libraries patched. ### Zeitleiste - 2004: The OTR design was published in the WPES paper linked from the official OTR documentation. - 2012: libotr 4.0.0 and pidgin-otr 4.0.0 were released. - 2014: libotr 4.1.0 was released with build-system, secure-memory, constant-time comparison, and API changes. - 2016: libotr 4.1.1 fixed CVE-2016-2851 and tightened protocol parsing. ### Related projects - pidgin-otr is the best-known client plugin distributed alongside libotr by the OTR project. - The OTR protocol documents define the wire protocol that libotr implements. - XMPP clients and multiprotocol IM clients were the main ecosystem where libotr was reused. ### Quellen - - - - - ## Sicherheitshinweise library-like package without higher-risk signals. - **Geiger-Risiko:** grün / niedrig - library-like package without higher-risk signals ## Andere Paketmanager-Einträge - Debian apt - libotr5-bin - 4.1.1-6: normalized package name match | Debian stable package indexes: libotr5-bin from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | toolkit for Off-the-Record Messaging library | https://otr.cypherpunks.ca/ - Debian apt - libotr5-dev - 4.1.1-6: normalized package name match | Debian stable package indexes: libotr5-dev from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Off-the-Record Messaging library development files | https://otr.cypherpunks.ca/ - Debian apt - libotr5t64 - 4.1.1-6: normalized package name match | Debian stable package indexes: libotr5t64 from https://deb.debian.org/debian/dists/stable/main/binary-amd64/Packages.xz | Off-the-Record Messaging library | https://otr.cypherpunks.ca/ - Nix - libotr: normalized package name match | nixpkgs package indexes: pkgs/by-name/li/libotr/package.nix from https://api.github.com/repos/NixOS/nixpkgs/git/trees/master?recursive=1 - Ubuntu apt - libotr5-bin - 4.1.1-5.1build1: normalized package name match | Ubuntu 24.04 LTS package indexes: libotr5-bin from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | toolkit for Off-the-Record Messaging library | https://otr.cypherpunks.ca/ - Ubuntu apt - libotr5-dev - 4.1.1-5.1build1: normalized package name match | Ubuntu 24.04 LTS package indexes: libotr5-dev from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | Off-the-Record Messaging library development files | https://otr.cypherpunks.ca/ - Ubuntu apt - libotr5t64 - 4.1.1-5.1build1: normalized package name match | Ubuntu 24.04 LTS package indexes: libotr5t64 from https://archive.ubuntu.com/ubuntu/dists/noble/universe/binary-amd64/Packages.gz | Off-the-Record Messaging library | https://otr.cypherpunks.ca/ - apk - libotr - 4.1.1-r5: normalized package name match | Alpine Linux edge package indexes: libotr from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz | Off The Record Messaging, an encryption library for secure IM conversations | http://otr.cypherpunks.ca/ - apk - libotr-dev - 4.1.1-r5: normalized package name match | Alpine Linux edge package indexes: libotr-dev from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz | Off The Record Messaging, an encryption library for secure IM conversations (development files) | http://otr.cypherpunks.ca/ - apk - libotr-doc - 4.1.1-r5: normalized package name match | Alpine Linux edge package indexes: libotr-doc from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz | Off The Record Messaging, an encryption library for secure IM conversations (documentation) | http://otr.cypherpunks.ca/ - apk - libotr-tools - 4.1.1-r5: normalized package name match | Alpine Linux edge package indexes: libotr-tools from https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz | libotr tools | http://otr.cypherpunks.ca/ - dnf - libotr - 4.1.1-26.fc45: normalized package name match | Fedora Rawhide package metadata: libotr from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/07190dc5ae9f35ae73866675fed6d95fe6e8d9fe22c9d7cdf85862cb2ed24a4c-primary.xml.zst | Off-The-Record Messaging library and toolkit | http://otr.cypherpunks.ca/ - dnf - libotr-devel - 4.1.1-26.fc45: normalized package name match | Fedora Rawhide package metadata: libotr-devel from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Everything/x86_64/os/repodata/07190dc5ae9f35ae73866675fed6d95fe6e8d9fe22c9d7cdf85862cb2ed24a4c-primary.xml.zst | Development library and include files for libotr | http://otr.cypherpunks.ca/ - pacman - libotr - 4.1.1-6: normalized package name match | Arch Linux sync databases: libotr from https://geo.mirror.pkgbuild.com/extra/os/x86_64/extra.db.tar.gz | Off-the-Record Messaging Library and Toolkit | https://otr.cypherpunks.ca/ - zypper - libotr-devel - 4.1.1-4.14: normalized package name match | openSUSE Tumbleweed package metadata: libotr-devel from https://download.opensuse.org/tumbleweed/repo/oss/repodata/50b07339cb64c8ed4091bdbabddadc1ff5737b090e478818a195b40d8a3292861a879139b4a3987c31109699fde9fbf4a716367ddf4eef77da75f96e3193d6ed-primary.xml.zst | Include files and development libraries | https://www.cypherpunks.ca/otr/ - zypper - libotr-tools - 4.1.1-4.14: normalized package name match | openSUSE Tumbleweed package metadata: libotr-tools from https://download.opensuse.org/tumbleweed/repo/oss/repodata/50b07339cb64c8ed4091bdbabddadc1ff5737b090e478818a195b40d8a3292861a879139b4a3987c31109699fde9fbf4a716367ddf4eef77da75f96e3193d6ed-primary.xml.zst | "Off The Record" messaging library toolkit | https://www.cypherpunks.ca/otr/ ## Combined YAML source View the package source record on GitHub. [combined/libotr.yml](https://github.com/mxcl/pkgdb/blob/main/combined/libotr.yml) ## Quellen - pkg.so package database - Geiger risk classifier - curated package history - pkgdb category and tag curation - external package-manager database matches - cross-ecosystem install command graph