ICSF provides services that you can use to perform various cryptographic functions. Examples of these functions include enciphering and deciphering data, generating and verifying message authentication codes, generating and verifying PINs, and dynamically updating the CKDS and PKDS. You can define an installation exit for each of the services to customize processing. For a detailed description of the services, see z/OS Cryptographic Services ICSF Application Programmer’s Guide.

Use this general format to request a service:

   CALL CSNBxxx (
                return_code
               ,reason_code
               ,exit_data_length
               ,exit_data
               ,parameter_5
               ,parameter_6
                 .
                 .
                 .
               ,parameter_N)

Table 14 lists the ICSF exit names for each of the services. The parameters that the application passes to a service are known as the service parameter list, and the parameters vary from service to service. Parameters describes the services parameter lists in more detail.