The following example extracts the public key from the certificate
   intmods.cer and creates a function named EISL_RetrieveSelfCheckKey()
   in the file modselfkey.h.

     $ create intmodscertfile.
     intmods.cer
     $!
     $ issuer -k intmodscertfile. modselfkey.h "EISL_RetrieveSelfCheckKey"