Ruby Example of AES-256 in CBC Mode for consti on #ruby IRC

cipher.rb

secret = 'cicada'
key = 'wombat'

cipher = OpenSSL::Cipher::AES256.new :CBC
cipher.encrypt
salt = OpenSSL::Random.random_bytes 16
cipher.key = OpenSSL::PKCS5.pbkdf2_hmac_sha1 key, salt, 20000, 32
iv = cipher.random_iv

encrypted = cipher.update(secret) << cipher.final

##
# Then later...
password = 'wombat'

cipher = OpenSSL::Cipher::AES256.new :CBC
cipher.decrypt
cipher.key = OpenSSL::PKCS5.pbkdf2_hmac_sha1 password, salt, 20000, 32
cipher.iv = iv

cipher.update(encrypted) << cipher.final
#=> cicada