Bouncy Castle – Open-source cryptographic APIs

Welcome to the home of the Legion of the Bouncy Castle and its FIPS-certified open-source cryptographic APIs for Java and C#.

Legion of the Bouncy Castle

Download Bouncy Castle 

Download the Bouncy Castle APIs for Java, Java FIPS, Java LTS, C# .NET, C# .NET FIPS or the Kotlin version. 

Read the Documentation 

Access necessary resources for your project here: installation instructions, configuration guides, test examples, and much more.

Join the Discussion

You can ask your questions and learn from specialists in the Bouncy Castle forum on GitHub Discussions.

Here at the Legion of the Bouncy Castle, we believe in cryptography 

We have been providing cryptography solutions for over 20 years, offering FIPS certifications, LTS releases, and quantum-ready support to meet everyone's needs.

24

Years of history

8

Years FIPS certified

6.2M

Downloads per month

Get inspired

Stay up-to-date on the latest Bouncy Castle news and updates through our news feed. From product releases to the newest tutorial videos, guides, and events, our feed provides the latest information on all things related to Bouncy Castle.

Keyfactor Release
Implementing Cryptography
Installation & Deployment
Post-Quantum Cryptography
Release
Ejbca
Signserver
31 March, 2025

EJBCA 9.1 Community is Here!

EJBCA 9.1 Community edition brings the latest advancements in PKI and cryptog...
PKI hierarchies - 1, 2, 3 tiers ?
DevOps
Installation & Deployment
Signing
Tech Update
Ejbca
Signserver
26 March, 2025

#KEYMASTER: Bringing Transparency to Software Supply Chains – A Deep Dive into SLSA

In this #KEYMASTER episode, host Sven Rajala is joined by Fredrik Skogman fro...
PKI hierarchies - 1, 2, 3 tiers ?
DevOps
Installation & Deployment
Signing
Tech Update
Ejbca
Signserver
25 March, 2025

#KEYMASTER: TUF Love: Securing Software Updates with The Update Framework

This KEYMASTER session discusses TUF, an open-source framework for securing s...

Related open-source projects