Openssl Command To Generate Private Key And Csr
What is a SAN
A SAN is a Subject Alternative Name, and as the name implies it serves as a secondary (or tertiary, etc.) DNS name that your web application could be identified as. This is useful in the context of web farms behind a reverse proxy, load-balancing solutions, etc.
For example:
The following sections describe how to use OpenSSL to generate a CSR for a single host name. If you want to generate a CSR for multiple host names, we recommend using the Cloud Control Panel or the MyRackspace Portal. Install OpenSSL. Check whether OpenSSL is installed by using the following command: CentOS® and Red Hat® Enterprise Linux®. May 13, 2019 There are two steps involved in generating a certificate signing request (CSR). First, you have to generate a private key, and then generate CSR using that private key. Step 1: Generate a private key. Enter the following command in the Terminal with sudo to generate a private key using RSA algorithm with a key length of 2048 bits. I am using the following command in order to generate a CSR together with a private key by using OpenSSL: openssl req -new -subj '/CN=sample.myhost.com' -out newcsr.csr -nodes -sha512 -newkey rsa. You can do this by right-clicking the command prompt shortcut in Windows. To generate a private key file called privkey.pem in your current working directory, type openssl genrsa -out privkey.pem 2048; Type openssl req -new -key privkey.pem -out request.csr This command generates a CSR in the PEM format in your current working directory.
Modern Browsers will show an SSL certificate as invalid if a proper SAN is not included, so it’s best practice for us to be in the habit of including SANs in our CSRs.
How to include a SAN
Extract Private Key Openssl
Because we want to include a SAN (Subject Alternative Name) in our CSR (and certificate), we need to use a customized openssl.cnf file.
While you could edit the ‘openssl req’ command on-the-fly with a tool like ‘sed’ to make the necessary changes to the openssl.cnf file, I will walk through the step of manually updating the file for clarity.
Example openssl.cnf file
Note that the subjectAltName declaration calls an array called @alt_names, which is defined at the bottom of the file.
To include a single SAN in your CSR, update the ‘DNS’ declaration to the appropriate value (in this example, ‘webserver1.scriptech.io’), and leave the DNS.x declarations commented out (#). The result is an @alt_names array with a single entry.
To include multiple SANS in your CSR, comment out (#) the ‘DNS’ declaration, and uncomment the DNS.x declarations that you need. For example, your [alt_names] section would look like:
The result is an @alt_names array with multiple entries.
Generate the new key and CSR
If you have not already, copy the contents of the example openssl.cnf file above into a file called ‘openssl.cnf’ somewhere. Make note of the location.
Also make sure you update the DN information (Country, State, etc.)
Create a new key
Create a new CSR
Verify the CSR
To view the contents of your new CSR, use the following command:
Openssl Windows Create Csr
This example shows a single SAN which I included in my openssl.cnf file.
Symmetric Key
Sign the CSR
Now that you have your properly-formatted CSR, you need to sign it using a Trusted Root Certificate Authority. Depending on your context, this could be a third-party CA like DigiCert or GoDaddy, or it could be an internal Certificate Authority (OpenSSL CA, Active Directory Certificate Services)
Private Key Bitcoin
The contents of a certificate in the openssl format can be viewed with the following command:
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