CONFIG_CRYPTO_SKEIN is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT

Skein digest algorithm

modulename: skein.ko

configname: CONFIG_CRYPTO_SKEIN

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Skein digest algorithm
In linux kernel since version 3.16 (release Date: 2014-08-03)  
Skein secure hash algorithm is one of 5 finalists from the NIST SHA3
competition.

Skein is optimized for modern, 64bit processors and is highly
customizable. See:

http://www.skein-hash.info/sites/default/files/skein1.3.pdf

for more information. This module also contains the threefish block
cipher algorithm.

source code: