CONFIG_CRYPTO_DEV_NIAGARA2 is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT

Niagara2 Stream Processing Unit driver

modulename: n2_crypto.ko


Linux Kernel Configuration
└─>Cryptographic API
└─>Hardware crypto devices
└─>Niagara2 Stream Processing Unit driver
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
Each core of a Niagara2 processor contains a Stream
Processing Unit, which itself contains several cryptographic
sub-units. One set provides the Modular Arithmetic Unit,
used for SSL offload. The other set provides the Cipher
Group, which can perform encryption, decryption, hashing,
checksumming, and raw copies.

source code: