An architecture and implementation of a keystore for cryptographic keys supporting PKI, OTP, and Information Cards. In addition to the keystore there is a protocol supporting provisioning and management of user-credentials.

Current specification:
http://webpki.org/papers/keygen2/sks-api-arch.pdf

Reference implementation:
http://code.google.com/p/openkeystore/source/browse/trunk/library/src/org/webpki/sks/test/SKSReferenceImplementation.java

NOTE: currently only the "library" and "resources" projects are suitable for download and testing:
$ cd library/build
$ ant
$ ant testkg2

Not yet fully compliant "Emulator":
http://keycenter.webpki.org