class SignController(private val clientAlias: String? = null,
                     private val clientPassword: String? = null) {

  fun requestSign(signable: ByteArray): ByteArray {
    val keyStore = KeyStore.getInstance(JCSP.HD_STORE_NAME, JCSP.PROVIDER_NAME).apply { load(null, null) }
    val privateKey = keyStore.getKey(clientAlias, clientPassword?.toCharArray()) as PrivateKey?
    val certificate = keyStore.getCertificate(clientAlias) as X509Certificate?
    if (privateKey == null || certificate == null) throw Error("Private key or/and certificate is null.")
    return Signature.getInstance(privateKey.algorithm, JCSP.PROVIDER_NAME).run {
      initSign(privateKey)
      update(signable)
      sign()
    }
  }
}

val initCode = CSPConfig.init(activity)

fun initJavaProviders() {

    // Загрузка Java CSP (хеш, подпись, шифрование,
    // генерация контейнеров).

    if (Security.getProvider(JCSP.PROVIDER_NAME) == null) {
      Security.addProvider(JCSP())
    }

    // Инициализация XML DSig (хеш, подпись).
    XmlInit.init()

  }