Andreas Plachlibzpc - A Protected-Key Cryptographic Library
https://www.ibm.com/docs/en/linux-on-systems?topic=library-libzpc-15
There is one enhancement in the libzpc 1.5 version:
libzpc 1.5 now reacts to a verification pattern mismatch caused by live guest relocation or migration by re-creating the protected keys from the key material it was derived from.
libzpc - A Protected-Key Cryptographic Library
libzpc offers APIs to exploit the high performance of protected-key cryptography in the CPACF without the need to code assembler language. As protected keys are volatile, libzpc provides a mechanism to keep a protected key's effective key as a permanent secure key with the possibility to automatically derive a new protected key whenever required.