.ec.key -config domain >.ec.conf -out domain >.ec.csr Hopefully that all makes sense.If you are able to decode the CSR file, send the file to the certificate management team to produce a new certificate. Create a configuration file. Below are the basic steps to use OpenSSL and create a TLS certificate request using a config file and a private key. If more SAN names are needed, add more DNS lines in the [alt_names] section. So I added it again here. Now in common-field, we use www.example.com version â if SSL is for www and non-www versions of domains. "openssl.exe" x509 -req -days 730 -in request.req -CA ca.crt -CAkey ca.key -set_serial 02 -extensions req_ext ⦠Now itâs time to configure OpenSSL. You can create a folder with PowerShell by running the below command. $ cat << EOL > san.conf [ req ] default_bits = 2048 default_keyfile = san.key #name of the keyfile distinguished_name = req_distinguished_name req_extensions = req_ext ⦠By default, OpenSSL on Windows 10 does not come with a configuration file. Return to How to Configure Let's Encrypt with acme_tiny.py The command generates the certificate (-out) and the private key (-keyout) by using the configuration file (-config). After setting up nginx config file everything worked perfectly. My normal certificate creation process is to generate an openssl.cnf file, then using this file generate a csr (certificate signing request), and then generate a certificate from the csr using my own CA. A configuration file ⦠Note: alt_names section is the one you have to change for additional DNS. The .cnf file is a plain text file which contains a section describing all the SANs that I would like included in the csr ⦠Configuring OpenSSL. Next page: First edit of Apache configuration â for Let's Encrypt challenge-response. Here is a complete example ssl.cnf file. Now you have your OpenSSL config file ready. This tutorial will store all certificates and related files in the C:\certs folder. Note: I couldnât find out whether we need to add domain used in common-name field again here. Sending the CSR to the CA When you are ready to send the CSR to the CA (e.g., DigiCert), you need to do so using the PEM formatâthe raw, encoded text of the CSR that you ⦠You will first create/modify the below config file to generate a private key. OpenSSL applications can also use the CONF library for their own purposes. [ alt_names ] DNS.1 = www.example.com DNS.2 = example.com. By Emanuele âLeleâ Calò October 30, 2014 2017-02-16â Editâ I changed this post to use a different method than what I used in the original version cause X509v3 extensions were not created or seen correctly by many certificate providers. The â-nodesâ parameter avoids setting a password to the private key. I was able to obtain the ssl certificate using this command from an Ubuntu 14.04 machine: openssl s_client -connect MyIP:443 -ssl3 -cipher RC4-SHA:RC4-MD5 Nginx config i ⦠It is used for the OpenSSL master configuration file openssl.cnf and in a few other places like SPKAC files and certificate extension files for the x509 utility. This CSR is the file you will submit to a certificate authority to get back the public cert. New-Item -ItemType Directory -Path C:\certs. Generate a private key: $ openssl genrsa -out san.key 2048 && chmod 0600 san.key. Then you will create a .csr. Change alt_names appropriately. Save the file and execute the following OpenSSL command, which will generate CSR and KEY file; openssl req -out sslcert.csr -newkey rsa:2048 -nodes -keyout private.key -config san.cnf. The OpenSSL CONF library can be used to read configuration files. Run OpenSSL command. 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