module AWS::S3::EncryptionUtils

def get_cipher_size(key_length)
  case key_length
  when 32 then 256
  when 24 then 192
  when 16 then 128
  else
    msg = "invalid key, symmetric key required to be 16, 24, or 32 bytes "
    msg << "in length, saw length #{key_length}"
    raise ArgumentError, msg
  end
end