z/OS Cryptographic Services ICSF System Programmer's Guide
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Installation Exits

z/OS Cryptographic Services ICSF System Programmer's Guide
SA22-7520-17

Your installation can define exit routines to supplement the Integrated Cryptographic Service Facility (ICSF), the key generator utility program (KGUP), and the PCF conversion program. Exit routines are programs that programmers at your installation write to allow you to “customize” an application. Your installation may need to perform specific functions with the data that your cryptographic application manipulates. At various points in processing, ICSF, KGUP, and the PCF conversion program release control to an exit routine.

Some common uses for installation exits include:

  • Identifying and verifying users
  • Accessing alternate data sets
  • Manipulating input commands
  • Manipulating output data

This topic describes the various types of exit points in ICSF and the functions that your exits can perform.

Attention: Only an experienced system programmer should use the ICSF installation exits. Writing an exit routine and installing a new exit are tasks that require a thorough knowledge of system programming in an OS/390 and z/OS environment. An unknowledgeable programmer who attempts to write exit routines or to install new exit points, runs the risk of seriously degrading the performance of your system and causing complete system failure.

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