Android Security Internals

Chapter 5. Cryptographic Providers

This chapter introduces Android’s cryptographic provider architecture and discusses the built-in providers and the algorithms they support. Because Android builds on the Java Cryptography Architecture (JCA), we introduce its design in brief, starting with the cryptographic service provider (CSP) framework. We then discuss the main JCA classes and interfaces, and the cryptographic primitives they implement. (We will briefly introduce each cryptographic primitive, but a thorough discussion is beyond the scope of this book and some familiarity with basic cryptography is assumed.) Next, we present Android’s JCA providers and cryptographic libraries as well as the algorithms each provider supports. Finally, we show ...