SHA-1

modulename: sha1_generic.ko

configname: CONFIG_CRYPTO_SHA1

Linux Kernel Configuration
└─>Cryptographic API
└─>Hashes, digests, and MACs
└─>SHA-1
In linux kernel since version 2.6.12  
SHA-1 secure hash algorithm (FIPS 180, ISO/IEC 10118-3)

source code:
crypto/sha1_generic.c

depends
CONFIG_CRYPTO

is selected by
CONFIG_RPCSEC_GSS_KRB5