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Openssl Generate Private Key From Existing Certificate



2020-3-28  In my case I would like to create certs without the private keys because they are generated on smart cards and they cannot be exported ever. And no, cards do not generate CSR during key generation. I have not found any option in OpenSSL create a certificate from the sole public key. Despite in theory it is very well possible.

Generate CSR - OpenSSL

Introduction

This article provides step-by-step instructions for generating a Certificate Signing Request (CSR) in OpenSSL. This is most commonly required for web servers such as Apache HTTP Server and NGINX. If this is not the solution you are looking for, please search for your solution in the search bar above.

Switch to a working directory

GNU/Linux & Mac OS X users:
Open a terminal and browse to a folder where you would like to generate your keypair

Windows Users:
Navigate to your OpenSSL 'bin' directory and open a command prompt in the same location.

Openssl Generate Private Key From Certificate

Generate a CSR & Private Key:

openssl req -out CSR.csr -new -newkey rsa:2048 -keyout privatekey.key

To generate a 4096-bit CSR you can replace the rsa:2048 syntax with rsa:4096 as shown below.

openssl req -out CSR.csr -new -newkey rsa:4096 -keyout privatekey.key

Public Private Key Encryption

Note: You will be prompted to enter a password in order to proceed. Keep this password as you will need it to use the Certificate.

Private

Fill out the following fields as prompted:
Note: The following characters can not be accepted: < > ~ ! @ # $ % ^ * / ( ) ?.,&

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Field Example
Country Name US (2 Letter Code)
State or Province New Hampshire (Full State Name)
Locality Portsmouth (Full City name)
Organization GMO GlobalSign Inc (Entity's Legal Name)
Organizational Unit Support (Optional, e.g. a department)
Common Name www.globalsign.com (Domain or Entity name)

You should now have a Private Key (privatekey.key) which should stay on your computer, and a Certificate Signing Request (CSR.csr), which can be submitted to GlobalSign to sign your public key. Each of these files can be viewed in a plain text editor such as Notepad, TextEdit, Vi, Nano, and Notepad++.