Generate Csr From Existing Private Key Openssl 4,7/5 5795 reviews

The following instructions will guide you through the CSR generation process on Apache OpenSSL. To learn more about CSRs and the importance of your private key, reference our Overview of Certificate Signing Request article. If you already generated the CSR and received your trusted SSL certificate, reference our SSL Installation Instructions and disregard the steps below.

Generate the CSR code and Private key for your certificate by running this command: openssl req -new -newkey rsa:2048 -nodes -keyout server.key -out servercsr.txt. Note: server.key and servercsr.txt are the Private key and the CSR code files. Feel free to use any file names, as long as you keep the.key and.txt extensions. This tutorial provides a step-by-step guide on how to generate a WildCard SSL Certificate Signing Request (CSR) for Apache + Mod SSL + OpenSSL. Which is mostly used to generate the private key.

One of the most versatile SSL tools is OpenSSL which is an open source implementation of the SSL protocol. There are versions of OpenSSL for nearly every platform, including Windows, Linux, and Mac OS X. OpenSSL is commonly used to create the CSR and private key for many different platforms, including Apache.

The private key however is stored on the machine that generated the CSR (presumably the server requiring the cert, but not necessarily) and is NOT included in the contents of the CSR, and may not be derived from the CSR. It is kept private. In general terms, the server generating the CSR generates a key pair (public and private). $ openssl req -out codesigning.csr -key private.key -new Where private.key is the existing private key. As you can see you do not generate this CSR from your certificate (public key). Also you do not generate the 'same' CSR, just a new one to request a new certificate. This command creates a new CSR (domain.csr) based on an existing private key (domain.key): openssl req -key domain.key-new -out domain.csr. Answer the CSR information prompt to complete the process. The -key option specifies an existing private key (domain.key) that will be used to generate a new CSR.

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1. Log In

Log in to your server’s terminal via Secure Shell (SSH).

Generate

2. Run CSR Generation Command

Generating a hash code from public and private keys in ubuntu 18 04 for modules. Generate a private key and CSR by running the following command:Here is the plain text version to copy and paste into your terminal:

Openssl Windows Create Csr

Note: Replace “server” with the domain name you intend to secure.

3. Enter your Information

Generate Csr From Existing Private Key Openssl

Enter the following CSR details when prompted:

  1. Common Name: The FQDN (fully-qualified domain name) you want to secure with the certificate such as www.google.com, secure.website.org, *.domain.net, etc.
  2. Organization: The full legal name of your organization including the corporate identifier.
  3. Organization Unit (OU): Your department such as ‘Information Technology’ or ‘Website Security.’
  4. City or Locality: The locality or city where your organization is legally incorporated. Do not abbreviate.
  5. State or Province: The state or province where your organization is legally incorporated. Do not abbreviate.
  6. Country: The official two-letter country code (i.e. US, CH) where your organization is legally incorporated.

Note: You are not required to enter a password or passphrase. This optional field is for applying additional security to your key pair.

4. Copy the CSR text from the file

Locate and open the newly created CSR in a text editor such as Notepad and copy all the text including:

Openssl Gen Csr

Note 1: Your CSR should be saved in the same user directory that you SSH into unless otherwise specified by you. Note 2: We recommend saving or backing up your newly generate “.key” file as this will be required later during the installation process.

5. Generate the order

Return to the Generation Form on our website and paste the entire CSR into the blank text box and continue with completing the generation process.

Upon generating your CSR, your order will enter the validation process with the issuing Certificate Authority (CA) and require the certificate requester to complete some form of validation depending on the certificate purchased. For information regarding the different levels of the validation process and how to satisfy the industry requirements, reference our validation articles.

After you complete the validation process and receive the trusted SSL Certificate from the issuing Certificate Authority (CA), proceed with the next step using our SSL Installation Instructions for Apache OpenSSL.

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