For any live website, SSL Certificates have become a key requirement. A Certificate Authority (CA) verifies and issue SSL certificates. There are two categories of these certificates:

1. Generate Key From Csr Openssl 1
2. Generate Key From Csr Openssl 10
3. Extract Private Key Openssl
4. Generate Key From Csr Openssl File

• Self-Signed certificates: As the name implies, these are the certificates that are signed by the identity creating it rather than by a trusted certificate authority. It is Mostly used in an intranet environment for trial and development purposes.
• CA Certificates: These certificates are signed by a trusted CA (Certificate Authority) such as Verisign, DigiCert, GoDaddy, Thawte, etc.

To obtain a self-signed SSL certificate or the one signed by a certificate authority, you first have to create a certificate signing request (CSR). After the CSR is generated, it is then submitted to a certificate authority to acquire an SSL certificate. CSR is a block of encrypted text that contains all the information including the organization’s name, country, city, email address, etc. required for the generation of an SSL certificate.

A CSR is a file containing your SSL Certificate application information, including your Public Key. Certificate Auto-Requester: We provides a useful tool to automatically create a public/private key pair on your local machine then use this key pair to generate a CSR and automatically submit it to us over a secure SSL connection to create your certificate for Apache. OpenSSL CSR Wizard. Our OpenSSL CSR Wizard is the fastest way to create your CSR for Apache (or any platform) using OpenSSL. Fill in the details, click Generate, then paste your customized OpenSSL CSR command in to your terminal. Note: After 2015, certificates for internal names will no longer be trusted.

Generate Key From Csr Openssl 1

In this article, we will explain how to generate a CSR on a Linux server or desktop using the command line. We will use Debian 10 OS for describing the procedure mentioned in this article.

Getting Started

For generating CSR on a Debian OS, we will need OpenSSL tool. OpenSSL is an open-source tool widely used for generating a CSR. To check whether OpenSSL is installed or not, open the Terminal in your Debian OS and then type the below command:

If it is already installed in your system, it will return the following results.

Installing OpenSSL

If you do not see the above results, then you have to install OpenSSL as follows:

Enter the below command in the Terminal to switch to super user account.

Enter the required password. Then execute the below command to install OpenSSL.

Wait for a while until the installation of OpenSSL is completed.

Generating CSR

Run the following command to generate a private key and the CSR. The command syntax is as follows:

Replace domain in the above command with your own domain name.

Enter a few details like Country name; State, Organization name, email address, etc. and make sure to enter the right information, as it will be later checked by a certificate authority.

Above command will generate a private key in the file domain.key and certificate request in the file domain.csr and save it in your current directory.

View and copy the contents of private key

You can view and store the private keys on your server that you may need later. However, the important thing is not to share it with anyone. Navigate to the directory where the key file is stored. Then run the below method in order to view the contents of the private key file:

Replace domain in the above command with your own domain name.

To copy the contents of the private key file, select and copy the entire content including the “BEGIN PRIVATE KEY” and “END PRIVATE KEY” tags.

View and copy contents of CSR file

To obtain an SSL certificate, you will need to send the certificate request to a certificate signing authority by copy-pasting the entire content of CSR file.

To view the content of CSR file, navigate to the directory where the CSR file is stored. Then run the below method:

Replace domain in the above command with your own domain name.

To copy the contents of the CSR file, select and copy the entire content including the “BEGIN CERTIFICATE REQUEST” and “END CERTIFICATE REQUEST” tags.

That was all you need to know about generating a certificate signing request (CSR) in a Debian 10 OS. Now you can get an SSL certificate from certificate signing authority by pasting the content of CSR file on the order form when enrolling for SSL certificate.

SSL Certificates fall into two broad categories: 1) Self-Signed Certificate which is an identity certificate that is signed by the same entity whose identity it certifies-on signed with its own private key, and 2) Certificates that are signed by a CA (Certificate Authority) such as Let’s Encrypt, Comodo and many other companies.

Self-Signed Certificates are commonly used in test environments for LAN services or applications. They can be generated for free using OpenSSL or any related tool. On the other hand, for sensitive, public-facing production services, applications or websites, it is highly recommended to use a certificate issued and verified by a trusted CA.

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The first step towards acquiring an SSL certificate issued and verified by a CA is generating a CSR (short for Certificate Signing Request).

In this article, we will demonstrate how to create a CSR (Certificate Signing Request) on a Linux system.

Creating a CSR – Certificate Signing Request in Linux

To create a CSR, you need the OpenSSL command line utility installed on your system, otherwise, run the following command to install it.

Then issue the following command to generate a CSR and the key that will protect your certificate.

where:

• req enables the part of OpenSSL that handles certificate requests signing.
• -newkey rsa:2048 creates a 2048-bit RSA key.
• -nodes means “don’t encrypt the key”.
• -keyout example.com.key specifies the filename to write on the created private key.
• -out example.com.csr specifies the filename to write the CSR to.

Answer correctly, the questions you will be asked. Note that your answers should match information in legal documents regarding the registration of your company. This information is critically checked by the CA before issuing your certificate.

After creating your CSR, view the contents of the file using a cat utility, select it and copy it.

Copy CSR Key

Then go back to your CA’s website, log in, go to the page will contain the SSL certificate you purchased, and activate it. Then in a window such as the one below, paste your CSR in the correct input field.

Generate Key From Csr Openssl 10

In this example, we created a CSR for a multiple domain certificate purchased from Namecheap.

Extract Private Key Openssl

Then follow the rest of the instructions to initiate activation of your SSL certificate. For more information about OpenSSL command, see its man page:

Generate Key From Csr Openssl File

That’s all for now! Always remember that the first step to getting your own SSL certificate from a CA is to generate a CSR. Use the feedback form below to ask any questions or share your comments with us.