OpenSSL Essentials: Working with SSL Certificates, Private Keys and CSRs

OpenSSL Essentials

OpenSSL Essentials: Working with SSL Certificates, Private Keys and CSRs

OpenSSL is a powerful tool for managing SSL certificates, private keys and Certificate Signing Requests (CSRs). In this tutorial, we will cover the essentials of working with OpenSSL.

Prerequisites

In order to follow this tutorial, you will need:

  • A computer running a Unix-based operating system (such as Linux or macOS)
  • OpenSSL installed on your computer
  • A basic understanding of command line tools

Creating a Self-Signed SSL Certificate

One of the most common uses of OpenSSL is to create a self-signed SSL certificate. This is useful for testing or for internal use, but should not be used for production websites. To create a self-signed SSL certificate, use the following command:

openssl req -x509 -newkey rsa:2048 -nodes -keyout example.key -out example.crt -subj "/CN=example.com"

This command will generate a new RSA private key, a new self-signed SSL certificate and save them to the files example.key and example.crt respectively. The -subj option sets the Common Name (CN) of the certificate to example.com. You can change this to your own domain name or IP address.

Creating a Certificate Signing Request

If you want to obtain a signed SSL certificate from a Certificate Authority (CA), you will need to create a Certificate Signing Request (CSR). To create a CSR, use the following command:

openssl req -new -newkey rsa:2048 -nodes -keyout example.key -out example.csr -subj "/CN=example.com"

This command will generate a new RSA private key and a new CSR and save them to the files example.key and example.csr respectively. The -subj option sets the Common Name (CN) of the certificate to example.com. You will need to provide this CSR to your CA when requesting a signed SSL certificate.

Working with Private Keys

Private keys are used to decrypt SSL traffic. To view the details of a private key, use the following command:

openssl rsa -in example.key -noout -text

This command will display the details of the private key, such as the modulus and the public exponent.

Working with SSL Certificates

SSL certificates are used to encrypt SSL traffic. To view the details of an SSL certificate, use the following command:

openssl x509 -in example.crt -noout -text

This command will display the details of the SSL certificate, such as the issuer, the subject and the expiration date.

Conclusion

OpenSSL is a powerful tool for managing SSL certificates, private keys and CSRs. In this tutorial, we have covered the essentials of

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