Implemented RFC 4226 - HOTP: An HMAC based One-Time-Password algorithm for BlackBerry 10 running QNX 6. Uses BlackBerry Cryptographic Kernel version 5.6 (SB-GSE-56). Various things are pending and the app in the current state can be found at github called QAuthenticator. A reference implementation of the algorithm in Groovy is at hotp.groovy.
I must say, BlackBerry cryptography library is just fantastic. And Qt makes C++ fun to program after me programming in higher level languages like Clojure.