A list shamelessly copied from: http://aerokid240.blogspot.com/2010/03/getting-started-with-openssl.html
# According to its manpage, it is a cryptography toolkit implementing the Secure Sockets Layer (SSL v2/v3) and # Transport Layer Security network protocols and related cryptography standards required by them. It is indeed # a command line tool and allows you to create RSA and DSA keys, x.509 certificates, calculation of message # digests, encryption and decryption of files with optional ciphers, etc. As there are so many ways to use this # tool, i will show some of its basic usages that one may find useful. # for command switches openssl -h # Documentation of the tool man openssl # list standard commands. Doesn't say what they do so you are better off using "man openssl" openssl list-standard-commands # list different symmetric ciphers you can use for encryption openssl list-cipher-commands # lists different hashing algorithms you can use for data integrity checking openssl list-message-digest-commands # creates the md5 hash for the string password echo "password" | openssl md5 # does the same thing as previous example echo "password" | openssl enc -md5 # encrypts the file "myfile.txt" using the blowfish cipher 'bf' to a new file 'myfile.txt.enc'. You can now delete the old file openssl bf -in myfile.txt -out myfile.txt.enc # encrypts the file "myfile.txt" using the blowfish cipher 'bf' to a new file 'myfile.txt.enc'. Equivalent to the above command. openssl enc -bf -in myfile.txt -out myfile.txt.enc # decrypts the file "myfile.txt.enc" using the blowfish cipher 'bf' and outputs the decrypted file to a new file name 'myfile.txt'. openssl enc -bf -d -in myfile.txt.enc -out myfile.txt ### Using Public Key Cryptography # Generates private key openssl genrsa -out private.key # generates public key from the private key openssl rsa -pubout -in private.key -out public.key # encrypt a file with public key. Note that you are limited to small file sizes openssl rsautl -encrypt -inkey public.key -pubin -in test.txt -out test.txt.pub # decrypts the file with the private key openssl rsautl -decrypt -inkey private.key -in test.txt.pub -out test.txt
