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GitHub - signalapp/libsignal: Home to the Signal Protocol as well as other cryptographic primitives which make Signal possible.
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8.351a1.312 1.312 0 0 1-1.146 1.954H1.33A1.313 1.313 0 0 1 .183 9.058ZM7 7V3H5v4Zm-1 3a1 1 0 1 0 0-2 1 1 0 0 0 0 2Z"></path> </svg> </span> <span></span> </div> </div> <div data-target="query-builder.screenReaderFeedback" aria-live="polite" aria-atomic="true" class="sr-only"></div> </query-builder></form> <div class="d-flex flex-row color-fg-muted px-3 text-small color-bg-default search-feedback-prompt"> <a target="_blank" href="https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax" data-view-component="true" class="Link color-fg-accent text-normal ml-2"> Search syntax tips </a> <div class="d-flex flex-1"></div> </div> </div> </div> </div> </modal-dialog></div> </div> <div data-action="click:qbsearch-input#retract" class="dark-backdrop position-fixed" hidden data-target="qbsearch-input.darkBackdrop"></div> <div class="color-fg-default"> <dialog-helper> <dialog data-target="qbsearch-input.feedbackDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="feedback-dialog" aria-modal="true" aria-labelledby="feedback-dialog-title" aria-describedby="feedback-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="feedback-dialog-title"> Provide feedback </h1> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="feedback-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 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dir=\"auto\"\u003eOverview\u003c/h1\u003e\u003ca id=\"user-content-overview\" class=\"anchor\" aria-label=\"Permalink: Overview\" href=\"#overview\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003elibsignal contains platform-agnostic APIs used by the official Signal clients and servers, exposed\nas a Java, Swift, or TypeScript library. The underlying implementations are written in Rust:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003elibsignal-protocol: Implements the Signal protocol, including the \u003ca href=\"https://signal.org/docs/\" rel=\"nofollow\"\u003eDouble Ratchet algorithm\u003c/a\u003e. A\nreplacement for \u003ca href=\"https://github.com/signalapp/libsignal-protocol-java\"\u003elibsignal-protocol-java\u003c/a\u003e and \u003ca href=\"https://github.com/signalapp/libsignal-metadata-java\"\u003elibsignal-metadata-java\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003esignal-crypto: Cryptographic primitives such as AES-GCM. We use \u003ca href=\"https://github.com/RustCrypto\"\u003eRustCrypto\u003c/a\u003e's where we can\nbut sometimes have differing needs.\u003c/li\u003e\n\u003cli\u003edevice-transfer: Support logic for Signal's device-to-device transfer feature.\u003c/li\u003e\n\u003cli\u003eattest: Functionality for remote attestation of \u003ca href=\"https://www.intel.com/content/www/us/en/architecture-and-technology/software-guard-extensions.html\" rel=\"nofollow\"\u003eSGX enclaves\u003c/a\u003e and server-side \u003ca href=\"https://en.wikipedia.org/wiki/Hardware_security_module\" rel=\"nofollow\"\u003eHSMs\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003ezkgroup: Functionality for \u003ca href=\"https://signal.org/blog/signal-private-group-system/\" rel=\"nofollow\"\u003ezero-knowledge groups\u003c/a\u003e and related features available in Signal.\u003c/li\u003e\n\u003cli\u003ezkcredential: An abstraction for the sort of zero-knowledge credentials used by zkgroup, based on the paper \"\u003ca href=\"https://eprint.iacr.org/2019/1416.pdf\" rel=\"nofollow\"\u003eThe Signal Private Group System\u003c/a\u003e\" by Chase, Perrin, and Zaverucha.\u003c/li\u003e\n\u003cli\u003epoksho: Utilities for implementing zero-knowledge proofs (such as those used by zkgroup); stands for \"proof-of-knowledge, stateful-hash-object\".\u003c/li\u003e\n\u003cli\u003eaccount-keys: Functionality for consistently using \u003ca href=\"https://signal.org/blog/signal-pins/\" rel=\"nofollow\"\u003ePINs\u003c/a\u003e as passwords in Signal's Secure Value Recovery system, as well as other account-wide key operations.\u003c/li\u003e\n\u003cli\u003eusernames: Functionality for username generation, hashing, and proofs.\u003c/li\u003e\n\u003cli\u003emedia: Utilities for manipulating media.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThis repository is used by the Signal client apps (\u003ca href=\"https://github.com/signalapp/Signal-Android\"\u003eAndroid\u003c/a\u003e, \u003ca href=\"https://github.com/signalapp/Signal-iOS\"\u003eiOS\u003c/a\u003e, and \u003ca href=\"https://github.com/signalapp/Signal-Desktop\"\u003eDesktop\u003c/a\u003e) as well as\nserver-side. Use outside of Signal is unsupported. In particular, the products of this repository\nare the Java, Swift, and TypeScript libraries that wrap the underlying Rust implementations. All\nAPIs and implementations are subject to change without notice, as are the JNI, C, and Node add-on\n\"bridge\" layers. However, backwards-incompatible changes to the Java, Swift, TypeScript, and\nnon-bridge Rust APIs will be reflected in the version number on a best-effort basis, including\nincreases to the minimum supported tools versions.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuilding\u003c/h1\u003e\u003ca id=\"user-content-building\" class=\"anchor\" aria-label=\"Permalink: Building\" href=\"#building\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eToolchain Installation\u003c/h3\u003e\u003ca id=\"user-content-toolchain-installation\" class=\"anchor\" aria-label=\"Permalink: Toolchain Installation\" href=\"#toolchain-installation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo build anything in this repository you must have \u003ca href=\"https://rust-lang.org\" rel=\"nofollow\"\u003eRust\u003c/a\u003e installed,\nas well as Clang, libclang, \u003ca href=\"https://cmake.org\" rel=\"nofollow\"\u003eCMake\u003c/a\u003e, Make, protoc, and git.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLinux/Debian\u003c/h4\u003e\u003ca id=\"user-content-linuxdebian\" class=\"anchor\" aria-label=\"Permalink: Linux/Debian\" href=\"#linuxdebian\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOn a Debian-like system, you can get these extra dependencies through \u003ccode\u003eapt\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ apt-get install clang libclang-dev cmake make protobuf-compiler git\"\u003e\u003cpre\u003e$ apt-get install clang libclang-dev cmake make protobuf-compiler git\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003emacOS\u003c/h4\u003e\u003ca id=\"user-content-macos\" class=\"anchor\" aria-label=\"Permalink: macOS\" href=\"#macos\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOn macOS, we have a best-effort maintained script to set up the Rust toolchain you can run by:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ bin/mac_setup.sh\"\u003e\u003cpre\u003e$ bin/mac_setup.sh\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRust\u003c/h2\u003e\u003ca id=\"user-content-rust\" class=\"anchor\" aria-label=\"Permalink: Rust\" href=\"#rust\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFirst Build and Test\u003c/h3\u003e\u003ca id=\"user-content-first-build-and-test\" class=\"anchor\" aria-label=\"Permalink: First Build and Test\" href=\"#first-build-and-test\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe build currently uses a specific version of the Rust nightly compiler, which\nwill be downloaded automatically by cargo. To build and test the basic protocol\nlibraries:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ cargo build\n...\n$ cargo test\n...\"\u003e\u003cpre\u003e$ cargo build\n...\n$ cargo \u003cspan class=\"pl-c1\"\u003etest\u003c/span\u003e\n...\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAdditional Rust Tools\u003c/h3\u003e\u003ca id=\"user-content-additional-rust-tools\" class=\"anchor\" aria-label=\"Permalink: Additional Rust Tools\" href=\"#additional-rust-tools\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe basic tools above should get you set up for most libsignal Rust development.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eEventually, you may find that you need some additional Rust tools like \u003ccode\u003ecbindgen\u003c/code\u003e to modify the bridges to the\nclient libraries or \u003ccode\u003etaplo\u003c/code\u003e for code formatting.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eYou should always install any Rust tools you need that may affect the build from cargo rather than from your system\npackage manager (e.g. \u003ccode\u003eapt\u003c/code\u003e or \u003ccode\u003ebrew\u003c/code\u003e). Package managers sometimes contain outdated versions of these tools that can break\nthe build with incompatibility issues (especially cbindgen).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo install the main Rust extra dependencies matching the versions we use, you can run the following commands:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ cargo +stable install cbindgen cargo-fuzz\n$ cargo +stable install --version \u0026quot;$(cat ../acknowledgments/cargo-about-version)\u0026quot; --locked cargo-about\n$ cargo +stable install --version \u0026quot;$(cat ../.taplo-cli-version)\u0026quot; --locked taplo-cli\"\u003e\u003cpre\u003e$ cargo +stable install cbindgen cargo-fuzz\n$ cargo +stable install --version \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e$(\u003c/span\u003ecat ../acknowledgments/cargo-about-version\u003cspan class=\"pl-pds\"\u003e)\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e --locked cargo-about\n$ cargo +stable install --version \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e$(\u003c/span\u003ecat ../.taplo-cli-version\u003cspan class=\"pl-pds\"\u003e)\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e --locked taplo-cli\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eJava/Android\u003c/h2\u003e\u003ca id=\"user-content-javaandroid\" class=\"anchor\" aria-label=\"Permalink: Java/Android\" href=\"#javaandroid\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo build for Android you must install several additional packages including a JDK,\nthe Android NDK/SDK, and add the Android targets to the Rust compiler, using\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003erustup target add armv7-linux-androideabi aarch64-linux-android i686-linux-android x86_64-linux-android\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo build the Java/Android \u003ccode\u003ejar\u003c/code\u003e and \u003ccode\u003eaar\u003c/code\u003e, and run the tests:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ cd java\n$ ./gradlew test\n$ ./gradlew build # if you need AAR outputs\"\u003e\u003cpre\u003e$ \u003cspan class=\"pl-c1\"\u003ecd\u003c/span\u003e java\n$ ./gradlew \u003cspan class=\"pl-c1\"\u003etest\u003c/span\u003e\n$ ./gradlew build \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e if you need AAR outputs\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can pass \u003ccode\u003e-P debugLevelLogs\u003c/code\u003e to Gradle to build without filtering out debug- and verbose-level\nlogs from Rust.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAlternately, a build system using Docker is available:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ cd java\n$ make\"\u003e\u003cpre\u003e$ \u003cspan class=\"pl-c1\"\u003ecd\u003c/span\u003e java\n$ make\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen exposing new APIs to Java, you will need to run \u003ccode\u003erust/bridge/jni/bin/gen_java_decl.py\u003c/code\u003e in\naddition to rebuilding. This requires installing the \u003ccode\u003ecbindgen\u003c/code\u003e Rust tool, as detailed above.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMaven Central\u003c/h3\u003e\u003ca id=\"user-content-maven-central\" class=\"anchor\" aria-label=\"Permalink: Maven Central\" href=\"#maven-central\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSignal publishes Java packages on \u003ca href=\"https://central.sonatype.org\" rel=\"nofollow\"\u003eMaven Central\u003c/a\u003e for its own use,\nunder the names org.signal:libsignal-server, org.signal:libsignal-client, and\norg.signal:libsignal-android. libsignal-client and libsignal-server contain native libraries for\nDebian-flavored x86_64 Linux as well as Windows (x86_64) and macOS (x86_64 and arm64).\nlibsignal-android contains native libraries for armeabi-v7a, arm64-v8a, x86, and x86_64 Android.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhen building for Android you need \u003cem\u003eboth\u003c/em\u003e libsignal-android and libsignal-client, but the Windows\nand macOS libraries in libsignal-client won't automatically be excluded from your final app. You can\nexplicitly exclude them using \u003ccode\u003epackagingOptions\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"android {\n // ...\n packagingOptions {\n resources {\n excludes += setOf(\u0026quot;libsignal_jni*.dylib\u0026quot;, \u0026quot;signal_jni*.dll\u0026quot;)\n }\n }\n // ...\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eandroid {\n // ...\n packagingOptions {\n resources {\n excludes += setOf(\"libsignal_jni*.dylib\", \"signal_jni*.dll\")\n }\n }\n // ...\n}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can additionally exclude \u003ccode\u003elibsignal_jni_testing.so\u003c/code\u003e if you do not plan to use any of the APIs\nintended for client testing.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSwift\u003c/h2\u003e\u003ca id=\"user-content-swift\" class=\"anchor\" aria-label=\"Permalink: Swift\" href=\"#swift\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo learn about the Swift build process see \u003ca href=\"/signalapp/libsignal/blob/main/swift\"\u003e\u003ccode\u003eswift/README.md\u003c/code\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eNode\u003c/h2\u003e\u003ca id=\"user-content-node\" class=\"anchor\" aria-label=\"Permalink: Node\" href=\"#node\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou'll need Node installed to build. If you have \u003ca href=\"https://github.com/nvm-sh/nvm\"\u003envm\u003c/a\u003e, you can run \u003ccode\u003envm use\u003c/code\u003e to select an\nappropriate version automatically.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWe use \u003ccode\u003enpm\u003c/code\u003e as our package manager, and \u003ccode\u003enode-gyp\u003c/code\u003e to control building the Rust library.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ cd node\n$ nvm use\n$ npm install\n$ npx node-gyp rebuild # clean-\u0026gt;configure-\u0026gt;build\n$ npm run tsc\n$ npm run test\"\u003e\u003cpre\u003e$ \u003cspan class=\"pl-c1\"\u003ecd\u003c/span\u003e node\n$ nvm use\n$ npm install\n$ npx node-gyp rebuild \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e clean-\u0026gt;configure-\u0026gt;build\u003c/span\u003e\n$ npm run tsc\n$ npm run \u003cspan class=\"pl-c1\"\u003etest\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen testing changes locally, you can use \u003ccode\u003enpm run build\u003c/code\u003e to do an incremental rebuild of the Rust library. Alternately, \u003ccode\u003enpm run build-with-debug-level-logs\u003c/code\u003e will rebuild without filtering out debug- and verbose-level logs.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhen exposing new APIs to Node, you will need to run \u003ccode\u003erust/bridge/node/bin/gen_ts_decl.py\u003c/code\u003e in\naddition to rebuilding.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eNPM\u003c/h3\u003e\u003ca id=\"user-content-npm\" class=\"anchor\" aria-label=\"Permalink: NPM\" href=\"#npm\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSignal publishes the NPM package \u003ccode\u003e@signalapp/libsignal-client\u003c/code\u003e for its own use, including native\nlibraries for Windows, macOS, and Debian-flavored Linux. Both x64 and arm64 builds are included for\nall three platforms, but the arm64 builds for Windows and Linux are considered experimental, since\nthere are no official builds of Signal for those architectures.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eContributions\u003c/h1\u003e\u003ca id=\"user-content-contributions\" class=\"anchor\" aria-label=\"Permalink: Contributions\" href=\"#contributions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSignal does accept external contributions to this project. However unless the change is\nsimple and easily understood, for example fixing a bug or portability issue, adding a new\ntest, or improving performance, first open an issue to discuss your intended change as not\nall changes can be accepted.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eContributions that will not be used directly by one of Signal's official client apps may still be\nconsidered, but only if they do not pose an undue maintenance burden or conflict with the goals of\nthe project.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSigning a \u003ca href=\"https://signal.org/cla/\" rel=\"nofollow\"\u003eCLA (Contributor License Agreement)\u003c/a\u003e is required for all contributions.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCode Formatting and Acknowledgments\u003c/h2\u003e\u003ca id=\"user-content-code-formatting-and-acknowledgments\" class=\"anchor\" aria-label=\"Permalink: Code Formatting and Acknowledgments\" href=\"#code-formatting-and-acknowledgments\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can run the styler on the entire project by running:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"just format-all\"\u003e\u003cpre\u003ejust format-all\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can run more extensive tests as well as linters and clippy by running:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"just check-pre-commit\"\u003e\u003cpre\u003ejust check-pre-commit\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen making a PR that adjusts dependencies, you'll need to regenerate our acknowledgments files. See \u003ca href=\"/signalapp/libsignal/blob/main/acknowledgments\"\u003e\u003ccode\u003eacknowledgments/README.md\u003c/code\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLegal things\u003c/h1\u003e\u003ca id=\"user-content-legal-things\" class=\"anchor\" aria-label=\"Permalink: Legal things\" href=\"#legal-things\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCryptography Notice\u003c/h2\u003e\u003ca id=\"user-content-cryptography-notice\" class=\"anchor\" aria-label=\"Permalink: Cryptography Notice\" href=\"#cryptography-notice\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis distribution includes cryptographic software. The country in which you currently reside may have restrictions on\nthe import, possession, use, and/or re-export to another country, of encryption software. BEFORE using any encryption\nsoftware, please check your country's laws, regulations and policies concerning the import, possession, or use, and\nre-export of encryption software, to see if this is permitted. See \u003ca href=\"http://www.wassenaar.org/\" rel=\"nofollow\"\u003ehttp://www.wassenaar.org/\u003c/a\u003e for more information.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe U.S. Government Department of Commerce, Bureau of Industry and Security (BIS), has classified this software as\nExport Commodity Control Number (ECCN) 5D002.C.1, which includes information security software using or performing\ncryptographic functions with asymmetric algorithms. The form and manner of this distribution makes it eligible for\nexport under the License Exception ENC Technology Software Unrestricted (TSU) exception (see the BIS Export\nAdministration Regulations, Section 740.13) for both object code and source code.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLicense\u003c/h2\u003e\u003ca id=\"user-content-license\" class=\"anchor\" aria-label=\"Permalink: License\" href=\"#license\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCopyright 2020-2024 Signal Messenger, LLC\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eLicensed under the GNU AGPLv3: \u003ca href=\"https://www.gnu.org/licenses/agpl-3.0.html\" rel=\"nofollow\"\u003ehttps://www.gnu.org/licenses/agpl-3.0.html\u003c/a\u003e\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"Overview","anchor":"overview","htmlText":"Overview"},{"level":1,"text":"Building","anchor":"building","htmlText":"Building"},{"level":3,"text":"Toolchain Installation","anchor":"toolchain-installation","htmlText":"Toolchain Installation"},{"level":4,"text":"Linux/Debian","anchor":"linuxdebian","htmlText":"Linux/Debian"},{"level":4,"text":"macOS","anchor":"macos","htmlText":"macOS"},{"level":2,"text":"Rust","anchor":"rust","htmlText":"Rust"},{"level":3,"text":"First Build and Test","anchor":"first-build-and-test","htmlText":"First Build and Test"},{"level":3,"text":"Additional Rust Tools","anchor":"additional-rust-tools","htmlText":"Additional Rust Tools"},{"level":2,"text":"Java/Android","anchor":"javaandroid","htmlText":"Java/Android"},{"level":3,"text":"Maven Central","anchor":"maven-central","htmlText":"Maven Central"},{"level":2,"text":"Swift","anchor":"swift","htmlText":"Swift"},{"level":2,"text":"Node","anchor":"node","htmlText":"Node"},{"level":3,"text":"NPM","anchor":"npm","htmlText":"NPM"},{"level":1,"text":"Contributions","anchor":"contributions","htmlText":"Contributions"},{"level":2,"text":"Code Formatting and Acknowledgments","anchor":"code-formatting-and-acknowledgments","htmlText":"Code Formatting and Acknowledgments"},{"level":1,"text":"Legal things","anchor":"legal-things","htmlText":"Legal things"},{"level":2,"text":"Cryptography Notice","anchor":"cryptography-notice","htmlText":"Cryptography Notice"},{"level":2,"text":"License","anchor":"license","htmlText":"License"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Fsignalapp%2Flibsignal"}},{"displayName":"LICENSE","repoName":"libsignal","refName":"main","path":"LICENSE","preferredFileType":"license","tabName":"AGPL-3.0","richText":null,"loaded":false,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":null,"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Fsignalapp%2Flibsignal"}},{"displayName":"SECURITY.md","repoName":"libsignal","refName":"main","path":"SECURITY.md","preferredFileType":"security","tabName":"Security","richText":null,"loaded":false,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":null,"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Fsignalapp%2Flibsignal"}}],"overviewFilesProcessingTime":0}},"appPayload":{"helpUrl":"https://docs.github.com","findFileWorkerPath":"/assets-cdn/worker/find-file-worker-1583894afd38.js","findInFileWorkerPath":"/assets-cdn/worker/find-in-file-worker-67668e8c2caa.js","githubDevUrl":null,"enabled_features":{"code_nav_ui_events":false,"overview_shared_code_dropdown_button":false,"react_blob_overlay":false,"copilot_conversational_ux_embedding_update":false,"copilot_smell_icebreaker_ux":true,"copilot_workspace":false,"accessible_code_button":true}}}}</script> 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1.5h-8.5a.75.75 0 0 1 0-1.5ZM2 14a1 1 0 1 1 0-2 1 1 0 0 1 0 2Zm1-6a1 1 0 1 1-2 0 1 1 0 0 1 2 0ZM2 4a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg></button></div><div class="Box-sc-g0xbh4-0 QkQOb js-snippet-clipboard-copy-unpositioned" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Overview</h1><a id="user-content-overview" class="anchor" aria-label="Permalink: Overview" href="#overview"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">libsignal contains platform-agnostic APIs used by the official Signal clients and servers, exposed as a Java, Swift, or TypeScript library. The underlying implementations are written in Rust:</p> <ul dir="auto"> <li>libsignal-protocol: Implements the Signal protocol, including the <a href="https://signal.org/docs/" rel="nofollow">Double Ratchet algorithm</a>. A replacement for <a href="https://github.com/signalapp/libsignal-protocol-java">libsignal-protocol-java</a> and <a href="https://github.com/signalapp/libsignal-metadata-java">libsignal-metadata-java</a>.</li> <li>signal-crypto: Cryptographic primitives such as AES-GCM. We use <a href="https://github.com/RustCrypto">RustCrypto</a>'s where we can but sometimes have differing needs.</li> <li>device-transfer: Support logic for Signal's device-to-device transfer feature.</li> <li>attest: Functionality for remote attestation of <a href="https://www.intel.com/content/www/us/en/architecture-and-technology/software-guard-extensions.html" rel="nofollow">SGX enclaves</a> and server-side <a href="https://en.wikipedia.org/wiki/Hardware_security_module" rel="nofollow">HSMs</a>.</li> <li>zkgroup: Functionality for <a href="https://signal.org/blog/signal-private-group-system/" rel="nofollow">zero-knowledge groups</a> and related features available in Signal.</li> <li>zkcredential: An abstraction for the sort of zero-knowledge credentials used by zkgroup, based on the paper "<a href="https://eprint.iacr.org/2019/1416.pdf" rel="nofollow">The Signal Private Group System</a>" by Chase, Perrin, and Zaverucha.</li> <li>poksho: Utilities for implementing zero-knowledge proofs (such as those used by zkgroup); stands for "proof-of-knowledge, stateful-hash-object".</li> <li>account-keys: Functionality for consistently using <a href="https://signal.org/blog/signal-pins/" rel="nofollow">PINs</a> as passwords in Signal's Secure Value Recovery system, as well as other account-wide key operations.</li> <li>usernames: Functionality for username generation, hashing, and proofs.</li> <li>media: Utilities for manipulating media.</li> </ul> <p dir="auto">This repository is used by the Signal client apps (<a href="https://github.com/signalapp/Signal-Android">Android</a>, <a href="https://github.com/signalapp/Signal-iOS">iOS</a>, and <a href="https://github.com/signalapp/Signal-Desktop">Desktop</a>) as well as server-side. Use outside of Signal is unsupported. In particular, the products of this repository are the Java, Swift, and TypeScript libraries that wrap the underlying Rust implementations. All APIs and implementations are subject to change without notice, as are the JNI, C, and Node add-on "bridge" layers. However, backwards-incompatible changes to the Java, Swift, TypeScript, and non-bridge Rust APIs will be reflected in the version number on a best-effort basis, including increases to the minimum supported tools versions.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Building</h1><a id="user-content-building" class="anchor" aria-label="Permalink: Building" href="#building"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Toolchain Installation</h3><a id="user-content-toolchain-installation" class="anchor" aria-label="Permalink: Toolchain Installation" href="#toolchain-installation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">To build anything in this repository you must have <a href="https://rust-lang.org" rel="nofollow">Rust</a> installed, as well as Clang, libclang, <a href="https://cmake.org" rel="nofollow">CMake</a>, Make, protoc, and git.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Linux/Debian</h4><a id="user-content-linuxdebian" class="anchor" aria-label="Permalink: Linux/Debian" href="#linuxdebian"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">On a Debian-like system, you can get these extra dependencies through <code>apt</code>:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ apt-get install clang libclang-dev cmake make protobuf-compiler git"><pre>$ apt-get install clang libclang-dev cmake make protobuf-compiler git</pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">macOS</h4><a id="user-content-macos" class="anchor" aria-label="Permalink: macOS" href="#macos"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">On macOS, we have a best-effort maintained script to set up the Rust toolchain you can run by:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ bin/mac_setup.sh"><pre>$ bin/mac_setup.sh</pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Rust</h2><a id="user-content-rust" class="anchor" aria-label="Permalink: Rust" href="#rust"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">First Build and Test</h3><a id="user-content-first-build-and-test" class="anchor" aria-label="Permalink: First Build and Test" href="#first-build-and-test"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The build currently uses a specific version of the Rust nightly compiler, which will be downloaded automatically by cargo. To build and test the basic protocol libraries:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ cargo build ... $ cargo test ..."><pre>$ cargo build ... $ cargo <span class="pl-c1">test</span> ...</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Additional Rust Tools</h3><a id="user-content-additional-rust-tools" class="anchor" aria-label="Permalink: Additional Rust Tools" href="#additional-rust-tools"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The basic tools above should get you set up for most libsignal Rust development.</p> <p dir="auto">Eventually, you may find that you need some additional Rust tools like <code>cbindgen</code> to modify the bridges to the client libraries or <code>taplo</code> for code formatting.</p> <p dir="auto">You should always install any Rust tools you need that may affect the build from cargo rather than from your system package manager (e.g. <code>apt</code> or <code>brew</code>). Package managers sometimes contain outdated versions of these tools that can break the build with incompatibility issues (especially cbindgen).</p> <p dir="auto">To install the main Rust extra dependencies matching the versions we use, you can run the following commands:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ cargo +stable install cbindgen cargo-fuzz $ cargo +stable install --version "$(cat ../acknowledgments/cargo-about-version)" --locked cargo-about $ cargo +stable install --version "$(cat ../.taplo-cli-version)" --locked taplo-cli"><pre>$ cargo +stable install cbindgen cargo-fuzz $ cargo +stable install --version <span class="pl-s"><span class="pl-pds">"</span><span class="pl-s"><span class="pl-pds">$(</span>cat ../acknowledgments/cargo-about-version<span class="pl-pds">)</span></span><span class="pl-pds">"</span></span> --locked cargo-about $ cargo +stable install --version <span class="pl-s"><span class="pl-pds">"</span><span class="pl-s"><span class="pl-pds">$(</span>cat ../.taplo-cli-version<span class="pl-pds">)</span></span><span class="pl-pds">"</span></span> --locked taplo-cli</pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Java/Android</h2><a id="user-content-javaandroid" class="anchor" aria-label="Permalink: Java/Android" href="#javaandroid"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">To build for Android you must install several additional packages including a JDK, the Android NDK/SDK, and add the Android targets to the Rust compiler, using</p> <p dir="auto"><code>rustup target add armv7-linux-androideabi aarch64-linux-android i686-linux-android x86_64-linux-android</code></p> <p dir="auto">To build the Java/Android <code>jar</code> and <code>aar</code>, and run the tests:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ cd java $ ./gradlew test $ ./gradlew build # if you need AAR outputs"><pre>$ <span class="pl-c1">cd</span> java $ ./gradlew <span class="pl-c1">test</span> $ ./gradlew build <span class="pl-c"><span class="pl-c">#</span> if you need AAR outputs</span></pre></div> <p dir="auto">You can pass <code>-P debugLevelLogs</code> to Gradle to build without filtering out debug- and verbose-level logs from Rust.</p> <p dir="auto">Alternately, a build system using Docker is available:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ cd java $ make"><pre>$ <span class="pl-c1">cd</span> java $ make</pre></div> <p dir="auto">When exposing new APIs to Java, you will need to run <code>rust/bridge/jni/bin/gen_java_decl.py</code> in addition to rebuilding. This requires installing the <code>cbindgen</code> Rust tool, as detailed above.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Maven Central</h3><a id="user-content-maven-central" class="anchor" aria-label="Permalink: Maven Central" href="#maven-central"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Signal publishes Java packages on <a href="https://central.sonatype.org" rel="nofollow">Maven Central</a> for its own use, under the names org.signal:libsignal-server, org.signal:libsignal-client, and org.signal:libsignal-android. libsignal-client and libsignal-server contain native libraries for Debian-flavored x86_64 Linux as well as Windows (x86_64) and macOS (x86_64 and arm64). libsignal-android contains native libraries for armeabi-v7a, arm64-v8a, x86, and x86_64 Android.</p> <p dir="auto">When building for Android you need <em>both</em> libsignal-android and libsignal-client, but the Windows and macOS libraries in libsignal-client won't automatically be excluded from your final app. You can explicitly exclude them using <code>packagingOptions</code>:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="android { // ... packagingOptions { resources { excludes += setOf("libsignal_jni*.dylib", "signal_jni*.dll") } } // ... }"><pre class="notranslate"><code>android { // ... packagingOptions { resources { excludes += setOf("libsignal_jni*.dylib", "signal_jni*.dll") } } // ... } </code></pre></div> <p dir="auto">You can additionally exclude <code>libsignal_jni_testing.so</code> if you do not plan to use any of the APIs intended for client testing.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Swift</h2><a id="user-content-swift" class="anchor" aria-label="Permalink: Swift" href="#swift"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">To learn about the Swift build process see <a href="/signalapp/libsignal/blob/main/swift"><code>swift/README.md</code></a></p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Node</h2><a id="user-content-node" class="anchor" aria-label="Permalink: Node" href="#node"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">You'll need Node installed to build. If you have <a href="https://github.com/nvm-sh/nvm">nvm</a>, you can run <code>nvm use</code> to select an appropriate version automatically.</p> <p dir="auto">We use <code>npm</code> as our package manager, and <code>node-gyp</code> to control building the Rust library.</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ cd node $ nvm use $ npm install $ npx node-gyp rebuild # clean->configure->build $ npm run tsc $ npm run test"><pre>$ <span class="pl-c1">cd</span> node $ nvm use $ npm install $ npx node-gyp rebuild <span class="pl-c"><span class="pl-c">#</span> clean->configure->build</span> $ npm run tsc $ npm run <span class="pl-c1">test</span></pre></div> <p dir="auto">When testing changes locally, you can use <code>npm run build</code> to do an incremental rebuild of the Rust library. Alternately, <code>npm run build-with-debug-level-logs</code> will rebuild without filtering out debug- and verbose-level logs.</p> <p dir="auto">When exposing new APIs to Node, you will need to run <code>rust/bridge/node/bin/gen_ts_decl.py</code> in addition to rebuilding.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">NPM</h3><a id="user-content-npm" class="anchor" aria-label="Permalink: NPM" href="#npm"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Signal publishes the NPM package <code>@signalapp/libsignal-client</code> for its own use, including native libraries for Windows, macOS, and Debian-flavored Linux. Both x64 and arm64 builds are included for all three platforms, but the arm64 builds for Windows and Linux are considered experimental, since there are no official builds of Signal for those architectures.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Contributions</h1><a id="user-content-contributions" class="anchor" aria-label="Permalink: Contributions" href="#contributions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Signal does accept external contributions to this project. However unless the change is simple and easily understood, for example fixing a bug or portability issue, adding a new test, or improving performance, first open an issue to discuss your intended change as not all changes can be accepted.</p> <p dir="auto">Contributions that will not be used directly by one of Signal's official client apps may still be considered, but only if they do not pose an undue maintenance burden or conflict with the goals of the project.</p> <p dir="auto">Signing a <a href="https://signal.org/cla/" rel="nofollow">CLA (Contributor License Agreement)</a> is required for all contributions.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Code Formatting and Acknowledgments</h2><a id="user-content-code-formatting-and-acknowledgments" class="anchor" aria-label="Permalink: Code Formatting and Acknowledgments" href="#code-formatting-and-acknowledgments"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">You can run the styler on the entire project by running:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="just format-all"><pre>just format-all</pre></div> <p dir="auto">You can run more extensive tests as well as linters and clippy by running:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="just check-pre-commit"><pre>just check-pre-commit</pre></div> <p dir="auto">When making a PR that adjusts dependencies, you'll need to regenerate our acknowledgments files. See <a href="/signalapp/libsignal/blob/main/acknowledgments"><code>acknowledgments/README.md</code></a>.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Legal things</h1><a id="user-content-legal-things" class="anchor" aria-label="Permalink: Legal things" href="#legal-things"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Cryptography Notice</h2><a id="user-content-cryptography-notice" class="anchor" aria-label="Permalink: Cryptography Notice" href="#cryptography-notice"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This distribution includes cryptographic software. The country in which you currently reside may have restrictions on the import, possession, use, and/or re-export to another country, of encryption software. BEFORE using any encryption software, please check your country's laws, regulations and policies concerning the import, possession, or use, and re-export of encryption software, to see if this is permitted. See <a href="http://www.wassenaar.org/" rel="nofollow">http://www.wassenaar.org/</a> for more information.</p> <p dir="auto">The U.S. Government Department of Commerce, Bureau of Industry and Security (BIS), has classified this software as Export Commodity Control Number (ECCN) 5D002.C.1, which includes information security software using or performing cryptographic functions with asymmetric algorithms. The form and manner of this distribution makes it eligible for export under the License Exception ENC Technology Software Unrestricted (TSU) exception (see the BIS Export Administration Regulations, Section 740.13) for both object code and source code.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">License</h2><a id="user-content-license" class="anchor" aria-label="Permalink: License" href="#license"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 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</div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/orgs/signalapp/packages?repo_name=libsignal" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center"> Packages <span title="0" hidden="hidden" data-view-component="true" class="Counter ml-1">0</span> </a></h2> <div class="text-small color-fg-muted" > No packages published <br> </div> </div> </div> <div class="BorderGrid-row" hidden> <div class="BorderGrid-cell"> <include-fragment src="/signalapp/libsignal/used_by_list" accept="text/fragment+html"> </include-fragment> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/signalapp/libsignal/graphs/contributors" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center"> Contributors <span title="49" data-view-component="true" class="Counter ml-1">49</span> </a></h2> <ul class="list-style-none d-flex flex-wrap mb-n2"> <li class="mb-2 mr-2" > <a href="https://github.com/jrose-signal" class="" data-hovercard-type="user" data-hovercard-url="/users/jrose-signal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/72036507?s=64&v=4" alt="@jrose-signal" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/jack-signal" class="" data-hovercard-type="user" data-hovercard-url="/users/jack-signal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/67017134?s=64&v=4" alt="@jack-signal" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/akonradi-signal" class="" data-hovercard-type="user" data-hovercard-url="/users/akonradi-signal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/144144902?s=64&v=4" alt="@akonradi-signal" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/moiseev-signal" class="" data-hovercard-type="user" data-hovercard-url="/users/moiseev-signal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/122060238?s=64&v=4" alt="@moiseev-signal" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/sergey-signal" class="" data-hovercard-type="user" data-hovercard-url="/users/sergey-signal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/116032710?s=64&v=4" alt="@sergey-signal" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/ehrenkret-signal" class="" data-hovercard-type="user" data-hovercard-url="/users/ehrenkret-signal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/62033421?s=64&v=4" alt="@ehrenkret-signal" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/andrew-signal" class="" data-hovercard-type="user" data-hovercard-url="/users/andrew-signal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/181278005?s=64&v=4" alt="@andrew-signal" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/gram-signal" class="" data-hovercard-type="user" data-hovercard-url="/users/gram-signal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/84339875?s=64&v=4" alt="@gram-signal" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/cosmicexplorer" class="" data-hovercard-type="user" data-hovercard-url="/users/cosmicexplorer/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/1305167?s=64&v=4" alt="@cosmicexplorer" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/ravi-signal" class="" data-hovercard-type="user" data-hovercard-url="/users/ravi-signal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/99042880?s=64&v=4" alt="@ravi-signal" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/rubdos" class="" data-hovercard-type="user" data-hovercard-url="/users/rubdos/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/1263440?s=64&v=4" alt="@rubdos" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/eager-signal" class="" data-hovercard-type="user" data-hovercard-url="/users/eager-signal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/79161849?s=64&v=4" alt="@eager-signal" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/dennisameling" class="" data-hovercard-type="user" data-hovercard-url="/users/dennisameling/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/17739158?s=64&v=4" alt="@dennisameling" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/jim-signal" class="" data-hovercard-type="user" data-hovercard-url="/users/jim-signal/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/50591733?s=64&v=4" alt="@jim-signal" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> </ul> <div data-view-component="true" class="mt-3"> <a text="small" href="/signalapp/libsignal/graphs/contributors" data-view-component="true" class="Link--inTextBlock Link"> + 35 contributors </a></div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3">Languages</h2> <div class="mb-2"> <span data-view-component="true" class="Progress"> <span style="background-color:#dea584 !important;;width: 61.3%;" itemprop="keywords" aria-label="Rust 61.3" data-view-component="true" class="Progress-item color-bg-success-emphasis"></span> <span style="background-color:#b07219 !important;;width: 14.3%;" itemprop="keywords" aria-label="Java 14.3" data-view-component="true" class="Progress-item color-bg-success-emphasis"></span> <span style="background-color:#F05138 !important;;width: 8.7%;" itemprop="keywords" aria-label="Swift 8.7" data-view-component="true" class="Progress-item color-bg-success-emphasis"></span> <span style="background-color:#e34c26 !important;;width: 7.0%;" itemprop="keywords" aria-label="HTML 7.0" 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viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">Rust</span> <span>61.3%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/signalapp/libsignal/search?l=java" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#b07219;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">Java</span> <span>14.3%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/signalapp/libsignal/search?l=swift" 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Popover-message--large Box color-shadow-large" style="width:360px;"> </div> </div> <template id="snippet-clipboard-copy-button"> <div class="zeroclipboard-container position-absolute right-0 top-0"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn js-clipboard-copy m-2 p-0" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon m-2"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none m-2"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> <template id="snippet-clipboard-copy-button-unpositioned"> <div class="zeroclipboard-container"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn btn-invisible js-clipboard-copy m-2 p-0 d-flex flex-justify-center flex-items-center" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> </div> <div id="js-global-screen-reader-notice" class="sr-only mt-n1" aria-live="polite" aria-atomic="true" ></div> <div id="js-global-screen-reader-notice-assertive" class="sr-only mt-n1" aria-live="assertive" aria-atomic="true"></div> 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