Perform the following steps to register a cryptographic module:
1. Implement the name( ) and verify( ) functions. These two routines must be implemented.
2. If your module needs to perform any initialization or finalization tasks, implement open( ) and/or close( ) routines for them. (These two routines are optional.)
3. Implement sign( ) and generate_keypair( ) functions if necessary. (These two routines are optional.)
4. Create a pkc_signature_algorithm_t structure containing the entrypoints of the routines implemented in Steps 1 to 3 (use NULL for the entrypoint of any unimplemented routines), and use this structure to register the algorithm implementation.