Support for s390 cryptographic adapters

modulename: zcrypt.ko

and/or

zcrypt_cex4.ko

configname: CONFIG_ZCRYPT

Linux Kernel Configuration
└─>Cryptographic API
└─>Hardware crypto devices
└─>Support for s390 cryptographic adapters
In linux kernel since version 2.6.22 (release Date: 2007-07-08)  
Select this option if you want to enable support for
s390 cryptographic adapters like Crypto Express 4 up
to 8 in Coprocessor (CEXxC), EP11 Coprocessor (CEXxP)
or Accelerator (CEXxA) mode.

source code:
drivers/s390/crypto//