ruby openssl AES encrypt and decrypt

gistfile1.rb

require 'base64'
require 'digest'
require 'openssl'

module AESCrypt

    def AESCrypt.encrypt(password, iv, cleardata)
      cipher = OpenSSL::Cipher.new('AES-256-CBC')
      cipher.encrypt  # set cipher to be encryption mode
      cipher.key = password
      cipher.iv  = iv

      encrypted = ''
      encrypted << cipher.update(cleardata)
      encrypted << cipher.final
      AESCrypt.b64enc(encrypted)
    end

    def AESCrypt.decrypt(password, iv, secretdata)
        secretdata = Base64::decode64(secretdata)
        decipher = OpenSSL::Cipher::Cipher.new('aes-256-cbc')
        decipher.decrypt
        decipher.key = password
        decipher.iv = iv if iv != nil
        decipher.update(secretdata) + decipher.final
    end

    def AESCrypt.b64enc(data)
      Base64.encode64(data).gsub(/\n/, '')
    end

end

password = Digest::SHA256.digest('Nixnogen')
iv       = 'a2xhcgAAAAAAAAAA'
buf      = "Here is some data for the encrypt" # 32 chars
enc      = AESCrypt.encrypt(password, iv, buf)
dec      = AESCrypt.decrypt(password, iv, enc)
puts "encrypt length: #{enc.length}"
puts "encrypt in Base64: " + enc
puts "decrypt all: " + dec