This file lists all installed cryptographic ciphers used by the Linux kernel, including additional details for each. A sample /proc/crypto file looks like the following:

name         : sha1 
module       : kernel 
type         : digest 
blocksize    : 64 
digestsize   : 20   
name         : md5 
module       : md5 
type         : digest 
blocksize    : 64 
digestsize   : 16