NIST SP800-90A DRBG (Deterministic Random Bit Generator)

modulename: drbg.ko

configname: CONFIG_CRYPTO_DRBG

Linux Kernel Configuration
└─>Cryptographic API
└─>Random number generation
└─>NIST SP800-90A DRBG (Deterministic Random Bit Generator)
In linux kernel since version 3.10 (release Date: 2013-06-30)
DRBG (Deterministic Random Bit Generator) (NIST SP800-90A)

Enable this only if you need it for a FIPS 140 certification.
It's otherwise redundant with the kernel's regular RNG.
source code: