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Top 23 C Cryptography Projects
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Project mention: Building a web server in aarch64 assembly to give my life (a lack of) meaning | news.ycombinator.com | 2026-05-11
You could borrow the output of the perl scripts from openssl.
https://github.com/openssl/openssl/blob/master/crypto/aes/as...
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mbedTLS
An open source, portable, easy to use, readable and flexible TLS library, and reference implementation of the PSA Cryptography API. Releases are on a varying cadence, typically around 3 - 6 months between releases.
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cjdns
An encrypted IPv6 network using public-key cryptography for address allocation and a distributed hash table for routing.
Project mention: Cjdns – An encrypted IPv6 overlay network using public-key cryptography | news.ycombinator.com | 2025-06-23 -
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Project mention: FreeBSD Capsicum vs. Linux Seccomp Process Sandboxing | news.ycombinator.com | 2026-03-09
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wolfssl
The wolfSSL library is a small, fast, portable implementation of TLS/SSL for embedded devices to the cloud. wolfSSL supports up to TLS 1.3 and DTLS 1.3! Update to wolfSSL 5.9.1 for the latest CVE fixes.
I wanted to mention WolfSSL.
I like to recommend that project because it has a very transparent vulnerabilities approach, and is in my opinion written a lot more sane than OpenSSL which is somewhat not using standard C features because it always implements everything from scratch like a kernel does.
But yeah, anyways, WolfSSL comes from the embedded area in case that's your thing.
[1] https://www.wolfssl.com/
[2] https://github.com/wolfssl/wolfssl
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The biggest issue with PGP/gpg is the difficulty of getting rid of it. If you work on big distros, or know someone who works on big distros, please (start asking them to) add https://github.com/jedisct1/minisign to pre-installed packages to facilitate transition. It's almost a chicken egg problem but the sad thing is, no project wants to swap the signing tool to a better one until everyone can verify the new signatures.
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Themis
Easy to use cryptographic framework for data protection: secure messaging with forward secrecy and secure data storage. Has unified APIs across 14 platforms.
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LibTomCrypt
LibTomCrypt is a fairly comprehensive, modular and portable cryptographic toolkit that provides developers with a vast array of well known published block ciphers, one-way hash functions, chaining modes, pseudo-random number generators, public key cryptography and a plethora of other routines.
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LibreSSL
LibreSSL Portable itself. This includes the build scaffold and compatibility layer that builds portable LibreSSL from the OpenBSD source code. Pull requests or patches sent to tech@openbsd.org are welcome.
We'll go over the analysis process using the example of the LibreSSL cryptographic library, which is a hard fork of OpenSSL designed to improve the codebase quality, security, and maintenance. The examples of command-line commands are written for Windows.
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Project mention: Flipper Zero DarkWeb Firmware Bypasses Rolling Code Security | news.ycombinator.com | 2025-08-07
You jest but there's no reason to stick with twenty year old component restrictions in a car that costs forty grand.
The real cost will be in the software validation and road safety hardening, but there's no reason why the ROM size should be limited to kilobytes.
You can implement full passkey cryptography on a basic esp32 (https://github.com/polhenarejos/pico-fido). Cut out the cruft and you can definitely get a similarly secure algorithm on an actual car key or key receiver.
And honestly, with cars now unlocking over Bluetooth and WiFi, standardising that process to something like FIDO wouldn't even be that awful of an idea. It certainly beats the "we can do cryptography at home" many car manufacturers seem to be going for.
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brainflayer
A proof-of-concept cracker for cryptocurrency brainwallets and other low entropy key algorithms.
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bitcracker
BitCracker is the first open source password cracking tool for memory units encrypted with BitLocker
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Hacking-Tools
This Repository is a collection of different ethical hacking tools and malware's for penetration testing and research purpose written in python, ruby, rust, c++, go and c.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C Cryptography discussion
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Building a web server in aarch64 assembly to give my life (a lack of) meaning
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A note from our sponsor - SaaSHub
www.saashub.com | 12 Jun 2026
Index
What are some of the best open-source Cryptography projects in C? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | OpenSSL | 30,267 |
| 2 | libsodium | 13,731 |
| 3 | mbedTLS | 6,693 |
| 4 | cjdns | 5,391 |
| 5 | Tiny AES128 in C | 4,906 |
| 6 | s2n | 4,732 |
| 7 | openssh-portable | 3,865 |
| 8 | pycryptodome | 3,232 |
| 9 | liboqs | 2,963 |
| 10 | wolfssl | 2,854 |
| 11 | minisign | 2,752 |
| 12 | c-toxcore | 2,648 |
| 13 | Themis | 1,966 |
| 14 | LibTomCrypt | 1,772 |
| 15 | trezor-firmware | 1,729 |
| 16 | LibreSSL | 1,476 |
| 17 | pico-fido | 1,234 |
| 18 | kyber | 1,198 |
| 19 | PyNacl | 1,195 |
| 20 | brainflayer | 999 |
| 21 | bitcracker | 963 |
| 22 | Hacking-Tools | 838 |
| 23 | CTFs | 830 |
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