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The .cnf file is a plain text file which contains a section describing all the SANs that I would like included in the csr … Next page: First edit of Apache configuration — for Let's Encrypt challenge-response. Now it’s time to configure OpenSSL. Configuring OpenSSL. Create a configuration file. 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 format—the raw, encoded text of the CSR that you … Now you have your OpenSSL config file ready. Now in common-field, we use www.example.com version – if SSL is for www and non-www versions of domains. Run OpenSSL command. Then you will create a .csr. If more SAN names are needed, add more DNS lines in the [alt_names] section. Note: alt_names section is the one you have to change for additional DNS. 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. The “-nodes” parameter avoids setting a password to the private key. 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. 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 … A configuration file … .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. $ 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 … The command generates the certificate (-out) and the private key (-keyout) by using the configuration file (-config). You will first create/modify the below config file to generate a private key. Change alt_names appropriately. # subjectAltName = @alt_names Complete example. Return to How to Configure Let's Encrypt with acme_tiny.py New-Item -ItemType Directory -Path C:\certs. This CSR is the file you will submit to a certificate authority to get back the public cert. OpenSSL CSR with Alternative Names one-line. Generate a private key: $ openssl genrsa -out san.key 2048 && chmod 0600 san.key. By Emanuele “Lele” Calò October 30, 2014 2017-02-16— Edit— 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. "openssl.exe" x509 -req -days 730 -in request.req -CA ca.crt -CAkey ca.key -set_serial 02 -extensions req_ext … Below are the basic steps to use OpenSSL and create a TLS certificate request using a config file and a private key. By default, OpenSSL on Windows 10 does not come with a configuration file. The OpenSSL CONF library can be used to read configuration files. [ alt_names ] DNS.1 = www.example.com DNS.2 = example.com. This will create sslcert.csr and … So I added it again here. You can create a folder with PowerShell by running the below command. Here is a complete example ssl.cnf file. This tutorial will store all certificates and related files in the C:\certs folder. OpenSSL applications can also use the CONF library for their own purposes. This is because CSR files are digitally signed, meaning if even a single character is changed in the file it will be rejected by the CA. 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. Note: I couldn’t find out whether we need to add domain used in common-name field again here. 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