A pkcs#11 implementation.
openCryptoki is an implementation of the PKCS#11 API standard. It provides an interface to the functions of underlying cryptographic tokens, which may be implemented via software or hardware. The PKCS#11 specification has been released by RSA Labs. More information on PKCS#11 can be found on the RSA labs website: http://www.rsa.com/rsalabs.
To use openCryptoki, first run pkcs11_startup to initialize the contents of the pk_config_data file. Then run the pkcsslotd daemon. At this point, openCryptoki is ready to start receiving PKCS#11 requests from user applications. If openCryptoki is included by your distro, its likely that pkcs11_startup is run automatically by an init script.
Use the pkcsconf utility to further configure openCryptoki once the daemon is running.