CAST6 (CAST-256)

modulename: cast6_generic.ko

configname: CONFIG_CRYPTO_CAST6

Linux Kernel Configuration
└─>Cryptographic API
└─>Block ciphers
└─>CAST6 (CAST-256)
In linux kernel since version 2.6.12  
CAST6 (CAST-256) encryption algorithm (RFC2612)

source code: