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The following function works perfect in PHP. How can it be translated in Ruby on Rails.

Please note that both privateKey and iv are 32 characters long.

mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $privateKey, base64_decode($enc), MCRYPT_MODE_CBC, $iv)

I tried to use the following in Ruby but got a bad decrypt error.

cipher = OpenSSL::Cipher.new('aes-256-cbc')

cipher.decrypt
cipher.key = privateKey
cipher.iv = iv

decrypted = '' << cipher.update(encrypted) << cipher.final