Ruby AES128 encrypt-decrypt example

gistfile1.rb

require "openssl"                                                                                                                                                                                           
require "base64"                                                                                                                                                                                            
                                                                                                                                                                                                            
include Base64                                                                                                                                                                                              
                                                                                                                                                                                                            
plain_text = "The beatings will continue until morale improves"                                                                                                                                             
                                                                                                                                                                                                            
cipher = OpenSSL::Cipher::AES128.new(:CBC)                                                                                                                                                                  
cipher.encrypt                                                                                                                                                                                              
key = cipher.random_key                                                                                                                                                                                     
iv = cipher.random_iv                                                                                                                                                                                       
cipher_text = cipher.update(plain_text) + cipher.final                                                                                                                                                      
                                                                                                                                                                                                            
cipher = OpenSSL::Cipher::AES128.new(:CBC)                                                                                                                                                                  
cipher.decrypt                                                                                                                                                                                              
cipher.key = key                                                                                                                                                                                            
cipher.iv = iv                                                                                                                                                                                              
decrypted_plain_text = cipher.update(cipher_text) + cipher.final                                                                                                                                            
                                                                                                                                                                                                            
puts "AES128 in CBC mode"                                                                                                                                                                                   
puts "Key: " + urlsafe_encode64(key)                                                                                                                                                                        
puts "Iv: " + urlsafe_encode64(iv)                                                                                                                                                                          
puts "Plain text: " + plain_text                                                                                                                                                                            
puts "Cipher text: " + urlsafe_encode64(cipher_text)                                                                                                                                                        
puts "Decrypted plain text: " + decrypted_plain_text