Verify or Install OpenSSL
OpenSSL is used to generate the key file and CSR for your certificate. This is a common package and is available on all of the major Linux distributions through their package installers. You will also be able to find installers for MAC and Windows. This tutorial outlines the step with Linux.
To check whether it is installed on a system that uses yum (such as CentOS or Red Hat Enterprise Linux), run the following command.
rpm -qa | grep -i openssl
The preceding command should return the following or similar packages:
If these packages are not returned, install OpenSSL by running the following command:
yum install openssl openssl-devel
To check whether OpenSSL is installed in a Debian or Ubuntu system, run the following command:
dpkg -l |grep openssl
You should receive the following output.
ii libgnutls-openssl27:amd64 2.12.23-12ubuntu2.4 amd64 GNU TLS library - OpenSSL wrapper
ii openssl 1.0.1f-1ubuntu2.16 amd64 Secure Sockets Layer toolkit - cryptographic utility
If you don’t see the expected output, install OpenSSL, run the following command:
apt-get install openssl