zhouzhuojie

class Crypto
  # encrypts data with the given key. returns a binary data with the
  # unhashed random iv in the first 16 bytes
  def self.encrypt(data, key)
    cipher = OpenSSL::Cipher::Cipher.new("aes-256-cbc")
    cipher.encrypt
    cipher.key = key = Digest::SHA256.digest(key)
    random_iv = cipher.random_iv
    cipher.iv = Digest::SHA256.digest(random_iv + key)[0..15]
    encrypted = cipher.update(data)