IV "magic"

gistfile1.rb

require 'openssl'

data = "letest" * 10

cipher = OpenSSL::Cipher::AES128.new('CBC')
cipher.encrypt
key = OpenSSL::Random.random_bytes(cipher.key_len)
cipher.key = key
cipher.iv = "OpenSSL for Ruby rulez!"

enc = cipher.update(data) + cipher.final

cipher.reset
cipher.decrypt
cipher.key = key
cipher.iv = "OpenSSL for Ruby is OK, but I rule!"

dec = cipher.update(enc) + cipher.final

puts dec == data