![]() ![]() When you will run this command, you will be prompted with a series of questions which you need to answer with required information. The above command will use our private key and generate a CSR file with provided name. Openssl req -new -key tutorialspedia.key -out tutorialspedia.csr For that purpose, we need to generate a CSR with below command: For the private key generated, next important step is to get it signed by a CA (Certification Authority) or else self-sign it. So far we have created a keypair and extracted public key from that. The above command exports public key from our keypair and saves it in a file with the name tutorialspedia_public.key How to Create Certificate Signing Request (CSR) using OpenSSL Openssl rsa -in tutorialspedia.key -pubout -out tutorialspedia_public.key OpenSSL provided you options to export public key using below command: The key file that you generated above actually contains a key-pair (a private key as well an associated public key). How to Extract Public Key from a Key File Using OpenSSL Remember that PEM file that you will read using these commands will provide you file content but content will be PEM encoded and you won’t be able to understand those. In Linux you can use cat command to read file content and in Windows you can type command. The command will generate the key in the provided file and you can open the file and check the content which will be in PEM format. The above command will generate a key using RSA algorithm with key length provided as 2048 bits. Openssl genrsa -out tutorialspedia.key 2048 To generate a key for a domain named tutorialspedia, we will use below command: A key file that we will generate will be containing private key as well as associated public key which we will extract into another file. The first important step is to generate a key. Openssl version -a How to Genrate a Private Key Using OpenSSL To confirm that OpenSSL is installed and configured properly on your machine, run below command which will provide you details about openSSL version available on your machine: If you prefer going through this openSSL tutorial in text format instead, continue below. ![]() If you prefer this tutorial in video format, you can watch it below on TutorialsPedia YouTube channel: To know about how to setup openssl on your windows/linux machne, follow the instructions provided on OpenSSL official site. In this tutorial, I will walk you through different steps along with explanation of various commands and options used for generating keys, CSRs, certificates.īefore you proceed make sure that you have openSSL downloaded and is working fine on your machine. OpenSSL Step By Step Tutorial for Generating Private Keys, Certificates, CSR and Self Signed Certificate Another graphical tool used for generating Self Signed SSL/TLS certificates is Portecle and I have another tutorial explaining how to use Portecle for generating SSL/TLS certificates and keystores. Other than OpenSSL, Java Key Took is also a commonly used command line tool for certificates, keys and CSRs generation and I have another video tutorial, explaining how to use Java KeyTool for self signed certificates. OpenSSL is a widely used and a well known open source tool for generating self signed certificates, private keys, CSRs (Certificate Signing Requests) and for converting certificates from one format to another. ![]()
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