Simple to use OpenPGP API based on Bouncycastle
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Stateless OpenPGP Protocol for Java.

This module contains interfaces that model the API described by the Stateless OpenPGP Command Line Interface specification.

This module is not a command line application! For that, see sop-java-picocli.

Why should I use this?

If you need to use OpenPGP functionality like encrypting/decrypting messages, or creating/verifying signatures inside your application, you probably don't want to start from scratch and instead reuse some library.

Instead of locking yourselves in by depending hard on that one library, you can simply depend on the interfaces from sop-java and plug in a library (such as pgpainless-sop) that implements said interfaces.

That way you don't make yourself dependent from a single OpenPGP library and stay flexible. Should another library emerge, that better suits your needs (and implements sop-java), you can easily switch by swapping out the dependency with minimal changes to your code.

Why should I implement this?

Did you create an OpenPGP implementation that can be used in the Java ecosystem? By implementing the sop-java interface, you can turn your library into a command line interface (see sop-java-picocli). This allows you to plug your library into the OpenPGP interoperability test suite of the Sequoia-PGP project.