How to create a PFX file from CRT?

To create a PFX file from a CRT file, you'll typically need the corresponding private key as well. Here's a generalized approach, followed by specific steps derived from the provided reference:

General Steps (Common Approach)

1. Combine CRT and Key: The CRT file contains the certificate, and you will need its associated private key (usually a .key file). You can't make a PFX with just a CRT file; a private key is essential.

2. Use OpenSSL: The command-line tool OpenSSL is frequently used for this conversion.

   openssl pkcs12 -export -out certificate.pfx -inkey private.key -in certificate.crt

   • certificate.pfx: This is the name of the output PFX file. You can change it to something else.
   • private.key: This is the path to your private key file.
   • certificate.crt: This is the path to your CRT certificate file.

3. Set a password: When you run this command, OpenSSL will ask you to set a password for the PFX file. This protects the key.

Steps Based on Fortinet Reference

The provided reference is from a Fortinet environment, and while it uses slightly different terms, the core concepts are the same:

1. Password Setup:

   • When creating the PFX, you will be asked to enter a chosen password.
   • You'll need to re-enter the password for confirmation.

2. PFX Creation: The reference indicates that the system will create a file, specifically new-pfx-cert.pfx, when you complete the commands (likely an underlying OpenSSL or similar process). So, in that system, the equivalent of the OpenSSL step above is done behind the scenes as part of their settings.

3. Upload:

   • Navigate to "EMS - System Settings - SSL certificate - Upload".
   • Upload the generated new-pfx.pfx file.

   These steps, in this specific context, imply a tool or interface that completes the OpenSSL command, so you may not see the command line explicitly.

Summary

Step	Generic OpenSSL Steps	Fortinet Reference Steps
Prerequisites	CRT file and its private key file (.key)	CRT File and private key (Implied, within Fortinet process)
Conversion Process	openssl pkcs12 -export -out certificate.pfx -inkey private.key -in certificate.crt	Enter chosen password (twice for validation)
Output	certificate.pfx file	new-pfx.pfx file
Post Conversion	N/A	Upload the new-pfx.pfx file in system

Important Note: The Fortinet reference implies a system or interface where the PFX creation is handled internally and you are prompted to enter a password during the process. With other systems, you might use the more generic OpenSSL command. The core concept is the same: you take the certificate (CRT) and the private key and bundle them into a single PFX file, protected by a password.