[new port] security/opencdk

opencdk-0.4.5

  OpenCDK (Open Crypto Development Kit) provides basic parts   of the OpenPGP message format. The aim of the library is   *not* to replace any available OpenPGP version. There will be   no real support for key management (sign, revoke, alter   preferences, etc) and some other parts are only rudimentary   available. The main purpose is to handle and understand   OpenPGP packets and to use basic operations.