Files with the .CRT extensions are normally SSL/TLS certificates. The .CRT extension is one of the most commonly used SSL/TLS certificate formats in Linux and other Unix-like systems.
This tutorial will answer your question regarding creating a .CRT certificate file in Linux using the OpenSSL tool.
Prerequisites
- A Linux system
- A user with sudo privileges
Install OpenSSL
OpenSSL is an open-source that you can use to create self-signed SSL/TLS certificates with the .crt extension. You may already have the OpenSSL tool available on your Linux machine. Run the command below to confirm.
If OpenSSL is not already installed, then run the next command.
On Ubuntu/Debian based distributions:
On CentOS/Red Hat-based distributions:
The syntax for using the OpenSSL tool is:
Get a Private Key and a Certificate Signing Request File
Next, run the first command below to generate your private key. And the second command will output a certificate signing request (CSR) file.
$ openssl req -new -key private.key -out request.csr
Here’s a description of each command and option.
- genrsa Generate an RSA private key
- -out Output file
- -req Certificate signing request
- -new New request
- -key Path to a private key file
You require your private key to sign the SSL/TLS certificate. The CSR file will hold information about the entity for creating the SSL/TLS certificate. You would be prompted to enter your information accordingly.
Note: While generating the CSR file, you may leave some fields blank by hitting enter on the keyboard. It is okay to leave the fields under ‘extra’ attributes blank.
Create a .CRT File
After the private key and CSR files are generated, it is time to create your .crt file.
Below is a description of each command and option.
- x509 Certificate data management standard
- -req Certificate signing request
- -days Number of days the certificate should be valid for
- -in Path to CSR file
- –signkey Path to private key file for signing the certificate
- -out Output file for the signed certificate
Your .CRT file will be saved in the current working directory, except you specified a different path.
Conclusion
Following this guide, you should now create a .CRT file by using the OpenSSL tool. Technically, this is a self-signed certificate and should be for internal use or testing and development purposes. Major web browsers do not have confidence in self-signed certificates.
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