Top 9 C SSL Projects

OpenSSL

42 17,363 9.9 C

TLS/SSL and crypto library

Project mention: Secure your API Gateway APIs mutual TLS | dev.to | 2022-01-17

First of all we are going to create the client certificate and the private certificate authority (CA) that we need. I will be using OpenSSL on Mac to create this.
Mongoose

7 7,855 9.6 C

Embedded Web Server (by cesanta)

Project mention: esp32 websockets sessions | reddit.com/r/esp32 | 2022-01-03

Another option is to use Mongoose. I've got some personal gripes with it but that aside it's a great library. I've implemented a few different WebSocket interfaces with it.
SonarQube

www.sonarqube.org
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s2n

0 4,038 9.4 C

s2n : an implementation of the TLS/SSL protocols
mbedTLS

3 3,315 10.0 C

An open source, portable, easy to use, readable and flexible SSL library

Project mention: Elliptic Curve Cryptography Explained | news.ycombinator.com | 2021-05-28

If you want to see a real implemention of arbitrary sized integer math, mbedTLS is a great example:
https://github.com/ARMmbed/mbedtls/blob/development/library/...
All of the ECC code in that library relies on this code, which can be accelerated by dedicated hardware.
GmSSL

1 2,802 2.7 C

支持国密SM2/SM3/SM4/SM9/ZUC/SSL的OpenSSL分支

Project mention: GmSSL | news.ycombinator.com | 2021-08-12
sslsplit

1 1,441 0.4 C

Transparent SSL/TLS interception

Project mention: droe/sslsplit - Transparent SSL/TLS interception | reddit.com/r/GithubSecurityTools | 2021-02-12
wolfssl

4 1,408 9.9 C

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!

Project mention: FOSS News International #2: November 8-145, 2021 | reddit.com/r/fossnews | 2021-11-15

wolfSSL 5.0.0
OPS

github.com/nanovms
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merecat

1 89 7.5 C

Small and made-easy HTTP/HTTPS server based on Jef Poskanzer's thttpd

Project mention: merecat: Small and made-easy HTTP/HTTPS server based on Jef Poskanzer's thttpd | reddit.com/r/opensource | 2021-10-04
openssl_examples

1 74 0.0 C

examples of using OpenSSL

Project mention: secure client-server communication | reddit.com/r/C_Programming | 2021-03-05

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). The latest post mention was on 2022-01-17.

C SSL related posts

Secure your API Gateway APIs mutual TLS
1 project | dev.to | 17 Jan 2022
Remember Stalkers. Anomaly is not the only modification that exists. Still alot of time before Stalker 2 will be released, so if you are bored you can try some of them. My favorite is Lost Alpha and newly released OP 2.2.
2 projects | reddit.com/r/stalker | 13 Jan 2022
esp32 websockets sessions
1 project | reddit.com/r/esp32 | 3 Jan 2022
Does Encryption Protect from Exploits?
1 project | reddit.com/r/PrivacyGuides | 18 Dec 2021
OpenSSL Security Advisory (14 December 2021)
3 projects | news.ycombinator.com | 14 Dec 2021
SSL for beginners
1 project | dev.to | 10 Dec 2021
Create a tool to capture the TLS handshake and cipher suite being used
2 projects | reddit.com/r/netsecstudents | 21 Nov 2021

Index

What are some of the best open-source SSL projects in C? This list will help you:

	Project	Stars
1	OpenSSL	17,363
2	Mongoose	7,855
3	s2n	4,038
4	mbedTLS	3,315
5	GmSSL	2,802
6	sslsplit	1,441
7	wolfssl	1,408
8	merecat	89
9	openssl_examples	74

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