new_contents: NIST_KEY_FREQUENCY = 'frequency'
  NIST_KEY_OUTPUT_VALUE = 'outputValue'
  NIST_KEY_PREVIOUS_OUTPUT_VALUE = 'previousOutputValue'
  NIST_KEY_SEED_VALUE = 'seedValue'
  NIST_KEY_SIGNATURE_VALUE = 'signatureValue'
  NIST_KEY_STATUS_CODE = 'statusCode'
  NIST_KEY_TIMESTAMP = 'timeStamp'
  NIST_KEY_VERSION = 'version'
  
subject: Prepare constants into seperate location