Rijndael

Easily encrypt and decrypt strings using AES.

Usage

First, you need to generate a new key, which is necessary for initializing the Rijndael::Base instance. Either use the command line tool rijndael -k or plain ruby.

$ gem install rijndael
$ irb
2.2.2 :001 > require 'rijndael'
2.2.2 :002 > Rijndael::Base.generate_key
 => "hoqqk6kQuRa1GlDi7P31GLEVj3l4I+lpF8IGtG5mWQE="

Now you can use an instance of Rijndael::Base to encrypt and decrypt your stuff. The decrypt_deep method supports instances of String, Array and Hash. It searches for the cipher pattern and tries to decrypt anything. The pattern looks like this: $IV$CIPHER

The IV is the initialization vector for AES, which will be generated randomly while encrypting. CIPHER is the actual cipher text.

$ irb
2.2.2 :001 > require 'rijndael'
2.2.2 :002 > r = Rijndael::Base.new('hoqqk6kQuRa1GlDi7P31GLEVj3l4I+lpF8IGtG5mWQE=')
2.2.2 :003 > r.encrypt('plain text')
 => "$sgqzGPPmH84Iw3VRqlv+FQ==$RYq4t6B3/vCUpzqKRwf+2g==" 
2.2.2 :004 > r.decrypt('$sgqzGPPmH84Iw3VRqlv+FQ==$RYq4t6B3/vCUpzqKRwf+2g==')
 => "plain text" 

Command Line Tool

Usage:

rijndael -k
rijndael (-e 'plain' | -d 'cipher')...
rijndael -k key [-e 'plain' | -d 'cipher']...

Options:

-k, --key [KEY]                  Generate or use key
-e, --encrypt PLAIN              Encrypt plain text
-d, --decrypt CIPHER             Decrypt cipher text
-h, --help                       Print this help

Attention! Be careful when encrypting/decrypting. Do not forget to use single quotes. Otherwise your shell might try to expand things like ~, $var or similar.