IBM® provides an ICHDEX01 exit in SYS1.LINKLIB that causes RACF® to use the masking algorithm to authenticate passwords. To use the ICHDEX01 exit that IBM provides, you must activate it by installing it in the link pack area so that RACF finds it during initialization. There are two methods you can use:

• Use an IEALPAxx member in SYS1.PARMLIB to request that MVS™ load ICHDEX01 from SYS1.LINKLIB as a temporary extension to the existing link pack area. Modify all your IEASYSxx members to specify that MVS should use this IEALPAxx member. See z/OS MVS Initialization and Tuning Guide for information. See member RACPARM in SYS1.SAMPLIB for a sample IEALPAxx member.
• Create an SMP/E USERMOD to move ICHDEX01 into LPALIB.