MD5

modulename: md5.ko

configname: CONFIG_CRYPTO_MD5

Linux Kernel Configuration
└─>Cryptographic API
└─>Hashes, digests, and MACs
└─>MD5
In linux kernel since version 2.6.12  
MD5 message digest algorithm (RFC1321)

source code:
crypto/md5.c

depends
CONFIG_CRYPTO

is selected by
CONFIG_RPCSEC_GSS_KRB5