[Help]How do that like java encrypt in swift

[heinaungzan]

Below class is java class.I have no idea how implement in swift that like.

class AES256(key: String) {
    private val ips: String
    private val keySpec: Key


fun encrypt(str: String?): String? {
    val cipher: Cipher
    try {
        cipher = Cipher.getInstance("AES/CTR/NoPadding")
        cipher.init(Cipher.ENCRYPT_MODE, keySpec, IvParameterSpec(ips.toByteArray(StandardCharsets.UTF_8)))
        val encrypted: ByteArray = cipher.doFinal(str!!.toByteArray(StandardCharsets.UTF_8))
        return Base64.getEncoder().withoutPadding().encodeToString(encrypted)
    } catch (e: NoSuchAlgorithmException) {
    } catch (e: NoSuchPaddingException) {
    } catch (e: InvalidKeyException) {
    } catch (e: InvalidAlgorithmParameterException) {
    } catch (e: IllegalBlockSizeException) {
    } catch (e: BadPaddingException) {
    }
    return null
  }
}