> ## Documentation Index
> Fetch the complete documentation index at: https://docs.futurex.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Before you start

> Checklist of environment prerequisites and requirements before integrating Java Jarsigner with CryptoHub.

Verify your environment meets these requirements.

## Supported hardware

* CryptoHub, `7.0.3.x` or later.

## Supported operating systems

* Linux
* Windows

## Required access

* An account on the CryptoHub with administrator permissions to deploy new services.
* Local administrator/root access on the computer where Java Jarsigner is installed.

## Network and firewall

* Allow outbound TCP port **2001**(default Host API port) from the computer running Java Jarsigner to the CryptoHub, specified by FQDN (for example, `cryptohub.example.com`) or CIDR (for example, `10.0.0.0/24`).

<Warning>
  TLS inspection or SSL proxies can break mutual TLS handshakes. Exempt the CryptoHub FQDN(s) from inspection. Configure the CryptoHub with a FQDN so the exemption applies.
</Warning>

## Other

* OpenSSL
* Oracle Java 11, 17, or 21

<Warning>
  To ensure proper compatibility between Java SunPKCS11 and the Futurex PKCS11 module, you must use Oracle Java instead of OpenJDK. We support Oracle Java 11, 17, and 21.
</Warning>