Bouncy Castle (cryptography)

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Bouncy Castle
Stable release

1.55 (Java) (August 19, 2016; 36 days ago (2016-08-19) [1]) [±]

1.8.1 (C#) (December 28, 2015; 8 months ago (2015-12-28) [2]) [±]
Written in C# and Java
Operating system Cross-platform
Type Cryptography API
License MIT License[3]

Bouncy Castle is a collection of APIs used in cryptography. It includes APIs for both the Java and the C# programming languages. The APIs are supported by a registered Australian charitable organization: Legion of the Bouncy Castle Inc.

Bouncy Castle is Australian in origin and therefore American restrictions on the export of cryptographic software do not apply to it.


Bouncy Castle started when two colleagues were tired of having to re-invent a set of cryptography libraries each time they changed jobs working in server-side JavaSE. One of the developers was active in JavaME (J2ME at that time) development as a hobby and a design consideration was to include the greatest range of Java VMs for the library, including those on J2ME.

This design consideration led to the architecture that exists in Bouncy Castle.

Some key properties of the project are:

  • Founded in May 2000. Now has around 20,000 downloads a month, including 5000 of the full Java distribution.
  • Originally just Java, C# API added in 2006.
  • Original Java API around 27,000 lines including test code. Provided support for J2ME, a JCE/JCA provider, and basic X.509 certificate generation.
  • Latest Java release, 1.53, 390,640 lines including test code. Supports same functionality as original release (with a larger number of algorithms) plus PKCS#10, PKCS#12, CMS, S/MIME, OpenPGP, DTLS, TLS, OCSP, TSP, CMP, CRMF, DVCS, DANE, and Attribute Certificates.
  • C# API around 145,000 lines. Supports most of what the Java API does.
  • Strong emphasis on standards compliance and adaptability.
  • Public support facilities include an issue tracker, dev mailing list and a wiki all available at the website.
  • Commercial support provided under resources for the relevant API listed on the Bouncy Castle website

On 18 October 2013, a not-for-profit association, the Legion of the Bouncy Castle Inc. was established in the state of Victoria, Australia, by the core developers and others to take ownership of the project and support the ongoing development of the APIs. The association was recognised as an Australian charity with a purpose of advancement in education and a purpose that is beneficial to the community by the Australian Charities and Not-For-Profits Commission on 7 November 2013. The association was authorised to fundraise to support its purposes on 29 November 2013 by Consumer Affairs Victoria.


The Bouncy Castle architecture consists of two main components that support the base cryptographic capabilities. These are known as the 'light-weight' API, and the Java Cryptography Extension (JCE) provider. There are further components that are built upon the JCE provider which support additional functionality such as PGP support, S/MIME and similar.

The low-level, or 'light-weight', API is a set of APIs that implement all the underlying cryptographic algorithms. The APIs were designed to be simple enough to use if needed, but provided the basic building blocks for the JCE provider. The intent is to use the low-level API in memory constrained devices (JavaME) or when easy access to the JCE libraries is not possible (such as distribution in an applet). As the light-weight API is just Java code, the Java virtual machine (JVM) does not impose any restrictions on the operation of the code, and at early times of the Bouncy Castle history it was the only way to develop strong cryptography that was not crippled by the Jurisdiction Policy files which prevented any JCE providers from performing "strong" encryption.

The JCE-compatible provider is built upon the low-level APIs. As such, the source code for the JCE provider is an example of how to implement many of the "common" crypto problems using the low-level API. Many projects have been built using the JCE provider, including an Open Source Certificate Authority EJBCA.

Spongy Castle[edit]

The Android operating system, as of early 2014, includes a customized version of Bouncy Castle.[4] Due to class name conflicts, this prevents Android applications from including and using the official release of Bouncy Castle as-is. A third-party project called Spongy Castle distributes a renamed version of the library to work around this issue.[5]

See also[edit]


  1. ^ "Latest Java Releases -". 2016-08-19. Retrieved 2016-09-03. 
  2. ^ "The Legion of the Bouncy Castle C# Cryptography APIs". 2015-12-28. Retrieved 2015-12-29. 
  3. ^ "Bouncy Castle - LICENSE". 
  4. ^ Reimer Pohlmann Schneider (October 17, 2014). ISSE 2014 Securing Electronic Business Processes: Highlights of the Information Security Solutions Europe 2014 Conference. Springer. p. 205. 
  5. ^ "Spongy Castle". Github. Retrieved April 29, 2013. 

External links[edit]

  • "Legion of the Bouncy Castle". 
  • Roedy Green. "Bouncy Castle". Mindprod Java glossary. 
  • kpbe An open source Password Based Encryption tool for files that uses Bouncy Castle C# implementation
  • JCrypTool (JCT) is a widespread open source e-learning tool illustrating more than 100 cryptographic and cryptanalytic concepts. It uses the Bouncy Castle Java implementation. JCT is built with Java/Eclipse/RCP/SWT and runs on Windows, MacOS, and Linux. See CrypTool.