Currently, xmlrss implements three redactable signature algorithms:

• PSRSS (based on "On Updatable Redactable Signatures" by Pöhls and Samelin)
• GSRSS (the general construction for sets, based on "A General Framework for Redactable Signatures and New Constructions" by Derler et al.)
• GLRSS (the general construction for lists, based on "A General Framework for Redactable Signatures and New Constructions" by Derler et al.)

XML encodings for following redactable signature algorithms:

• PSRSS
• GSRSS
• GLRSS

Take a look at the WPProvider class for the proper algorithm names and accumulator combinations.

Implementations of cryptographic accumulators:

• PSA accumulator (based on the trapdoor accumulator in "On Updatable Redactable Signatures" by Pöhls and Samelin)
• BP accumulator (based on "Collision-Free Accumulators and Fail-Stop Signature Schemes Without Trees" by Barić and Pfitzmann)

Do not use this code in Production!! It has not been peer-reviewed. Also, this repo will most likely be split into two seperate repositories for the interfaces and implementations to make 3rd party implementations easier.

xmlrss can be used very similar to other cryptographic service providers in Java:

• Add the xmlrss library as a dependency for your project
• Register the WPProvider(Security.addProvider(new WPProvider()))
• Use redactable signatures via the RedactableSignature engine class

This project uses gradle, which is pretty much self contained. Usually only a Java installation is required.

./gradlew build