aka:Message Digest
- SHA1
$ openssl sha1 first-file.txt SHA1(first-file.txt)= 4c49b08e9b258e0e5867d76ce583c159597b6857 $ openssl sha1 < first-file.txt (stdin)= 4c49b08e9b258e0e5867d76ce583c159597b6857 $
- T.B.D.
$ openssl sha1 first-file.txt SHA1(first-file.txt)= 4c49b08e9b258e0e5867d76ce583c159597b6857 $ openssl sha1 < first-file.txt (stdin)= 4c49b08e9b258e0e5867d76ce583c159597b6857 $