authenticate_challenge_reply_input {
  cast_message {
    protocol_version: CASTV2_1_0
    source_id: ""
    destination_id: ""
    namespace: ""
    payload_type: BINARY
  }
  nonce: ""
  start_case: VALID
  expiry_case: VALID
  nonce_ok: true
  response_certs_ok: true
  crl_certs_ok: true
  crl_signatures_ok: true

  auth_message {
    response {
      signature: ""
      signature_algorithm: RSASSA_PKCS1v15
      hash_algorithm: SHA1
      client_auth_certificate: ""
    }
  }

  tbs_crls {
    revoked_public_key_hashes: ""
    revoked_serial_number_ranges {
      issuer_public_key_hash: ""
      first_serial_number: 0
      last_serial_number: 0
    }
    version: 0
    not_before_seconds: 0
    not_after_seconds: 0
  }
}