SHA224 and SHA256 digest algorithm

modulename: sha256_generic.ko

configname: CONFIG_CRYPTO_SHA256

Linux Kernel Configuration
└─>Cryptographic API
└─>SHA224 and SHA256 digest algorithm
In linux kernel since version 2.6.12  
SHA256 secure hash standard (DFIPS 180-2).

This version of SHA implements a 256 bit hash with 128 bits of
security against collision attacks.

This code also includes SHA-224, a 224 bit hash with 112 bits
of security against collision attacks.

source code:
crypto/sha256_generic.c

depends
CONFIG_CRYPTO

is selected by
CONFIG_KEXEC_FILE