OpenSSL (md5sum sha1sum cksum)

# display currently version

openssl version

# openssl list-message-digest-commands

openssl dgst -sha1 file #(sha1,md5 etc.)

openssl md5 < file  <==>  md5sum file

openssl sha1 < file <==>  sha1sum file

# openssl list-cipher-commands

man openssl >> to see more details about enc ==> man enc <== u can see more!

# asn1parse(1), ca(1), config(5), crl(1), crl2pkcs7(1), dgst(1),

# dhparam(1), dsa(1), dsaparam(1), enc(1), gendsa(1), genrsa(1), nseq(1),

# openssl(1), passwd(1), pkcs12(1), pkcs7(1), pkcs8(1), rand(1), req(1),

# rsa(1), rsautl(1), s_client(1), s_server(1), s_time(1),

# smime(1),spkac(1), verify(1), version(1), x509(1), crypto(3),ssl(3)

# To encrypt a file named file.txt with a password, using triple DES in CBC

# mode,stored base64 encoded:

openssl enc -des3 -e -a -salt -in file.txt -out file.des3

# To decrypt the resulting file.des3 file:

openssl enc -des3 -d -a -salt -in file.des3 -out file.txt

#EXAMPLES:

#Just base64 encode a binary file:

openssl base64 -in file.bin -out file.b64

#Decode the same file:

openssl base64 -d -in file.b64 -out file.bin

#Encrypt a file using triple DES in CBC mode using a prompted password:

openssl des3 -salt -in file.txt -out file.des3

#Decrypt a file using a supplied password:

openssl des3 -d -salt -in file.des3 -out file.txt -k mypassword

#Encrypt a file then base64 encode it (so it can be sent via mail for  example) using Blowfish in CBC mode:

openssl bf -a -salt -in file.txt -out file.bf 

#Base64 decode a file then decrypt it:

openssl bf -d -salt -a -in file.bf -out file.txt