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wtf is openssl-zig?

kassane/openssl-zig — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2026-04-20

27CAudience · developerComplexity · 3/5MaintainedLicenseSetup · moderate

TL;DR

A fork of OpenSSL packaged as a dependency you can pull directly into Zig projects, giving Zig developers production-grade encryption and TLS without manually installing system OpenSSL.

Mindmap

mindmap
  root((repo))
    What it does
      OpenSSL for Zig
      TLS and crypto
    Tech stack
      C
      Zig
      OpenSSL
    Use cases
      HTTPS servers
      Signature verification
      Embedded builds
    Audience
      Zig developers

Code map

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filefunction / class

Why would anyone build with this?

REASON 1

Add HTTPS support to a Zig web server by declaring OpenSSL as a build dependency.

REASON 2

Verify digital signatures in a Zig command-line tool using proven cryptography.

REASON 3

Build OpenSSL for embedded Zig targets using the included build configuration.

What's in the stack?

CZigOpenSSL

How it stacks up

kassane/openssl-zigyiyifred/cloud-phonelemire/fastconstmap
Stars272728
LanguageCCC
Last pushed2026-04-20
MaintenanceMaintained
Setup difficultymoderatemoderateeasy
Complexity3/54/53/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · moderate Time to first run · 30min

Requires the Zig build system and pulling in the fork as a package dependency.

Use freely for any purpose, including commercial use, as long as you keep the copyright notice.

Wtf does this do

This repo is a fork of OpenSSL, the widely used open-source toolkit that powers secure, encrypted communication across the internet, adapted specifically to work as a dependency you can pull directly into projects using the Zig programming language's build system. OpenSSL is the engine behind HTTPS connections, secure email, and countless other services that need to keep data private and tamper-proof. At its core, the toolkit provides three main pieces. The first is a general-purpose cryptography library that handles tasks like encryption, decryption, and creating digital signatures. The second is an implementation of the TLS, DTLS, and QUIC protocols, the rules that let two computers establish a secure, encrypted channel over a network. The third is a command-line tool that acts as a Swiss army knife for things like generating certificates, testing connections, and calculating message digests. The primary audience here is developers working in Zig who need proven, production-grade cryptography in their applications without manually installing and linking system-level OpenSSL libraries. For example, if you are building a Zig web server that needs to serve HTTPS, or a command-line tool that verifies digital signatures, this fork lets you declare OpenSSL as a dependency in your build file and compile it in directly. It is also relevant for embedded development scenarios, given the included build configuration for embedded targets. What makes this fork notable is the packaging approach. OpenSSL is a massive C codebase with a notoriously complex build process. This project wraps that complexity so Zig's build system can fetch, compile, and link it automatically. The README does not go into detail about which specific OpenSSL version this tracks beyond the fork targeting support for a Zig package version, and it largely points back to upstream OpenSSL documentation for usage and API guidance. It is licensed under Apache 2.0, meaning it can be used in both commercial and non-commercial projects.

Yoink these prompts

Prompt 1
Show me how to add kassane/openssl-zig as a dependency in my Zig build.zig file.
Prompt 2
Help me build a simple HTTPS server in Zig using openssl-zig for TLS.
Prompt 3
Explain how openssl-zig wraps OpenSSL's build process so Zig's build system can compile it automatically.

Frequently asked questions

wtf is openssl-zig?

A fork of OpenSSL packaged as a dependency you can pull directly into Zig projects, giving Zig developers production-grade encryption and TLS without manually installing system OpenSSL.

What language is openssl-zig written in?

Mainly C. The stack also includes C, Zig, OpenSSL.

Is openssl-zig actively maintained?

Maintained — commit in last 6 months (last push 2026-04-20).

What license does openssl-zig use?

Use freely for any purpose, including commercial use, as long as you keep the copyright notice.

How hard is openssl-zig to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is openssl-zig for?

Mainly developer.

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