Deflate compression algorithm

modulename: deflate.ko

configname: CONFIG_CRYPTO_DEFLATE

Linux Kernel Configuration
└─>Cryptographic API
└─>Deflate compression algorithm
In linux kernel since version 2.6.12 )
This is the Deflate algorithm (RFC1951), specified for use in
IPSec with the IPCOMP protocol (RFC3173, RFC2394).

You will most probably want this if using IPSec.
source code: