This is a text-only version of the following page on https://raymii.org:
---
Title : OpenSSL Generate CSR non-interactive
Author : Remy van Elst
Date : 09-02-2013
URL : https://raymii.org/s/snippets/OpenSSL_generate_CSR_non-interactive.html
Format : Markdown/HTML
---
This is a short command to generate a CSR (certificate signing request) with
openssl without being prompted for the values which go in the certificate's
Subject field.
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When you use OpenSSL to generate a CSR and a private key you use the following
command:
openssl req -nodes -newkey rsa:2048 -keyout private.key -out CSR.csr
This is the output:
Generating a 2048 bit RSA private key
.................................................................+++
.......................................................................+++
writing new private key to 'private.key'
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:NL
State or Province Name (full name) [Some-State]:Zuid Holland
Locality Name (eg, city) []:Rotterdam
Organization Name (eg, company) [Internet Widgits Pty Ltd]:Sparkling Network
Organizational Unit Name (eg, section) []:IT Department
Common Name (e.g. server FQDN or YOUR name) []:ssl.raymii.org
Email Address []:
Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:
You can see that you have to fill in a lot of data during the generation. If you
do not want that, maybe because you are using a script to generate a lot of
CSR's and private keys, you use the following command. It does the same as the
above command, but it has all the data in it:
openssl req -nodes -newkey rsa:2048 -keyout private.key -out CSR.csr -subj "/C=NL/ST=Zuid Holland/L=Rotterdam/O=Sparkling Network/OU=IT Department/CN=ssl.raymii.org"
This is the output:
Generating a 2048 bit RSA private key
.......+++
..............................................................................................................................................+++
writing new private key to 'private.key'
-----
This is what the `-subj` option does:
* /C=NL: 2 letter ISO country code (Netherlands)
* /ST=: State, Zuid Holland (South holland)
* /L=: Location, city (Rotterdam)
* /O=: Organization (Sparkling Network)
* /OU=: Organizational Unit, Department (IT Department, Sales)
* /CN=: Common Name, for a website certificate this is the FQDN. (ssl.raymii.org)
You can also give a `/serialNumber=0123456` with the above option. [This is NOT
the serial number the issuing Certificate Authority (CA) will use, but a way to
give extra information to a certificate. If you have a CN for John Doe, and
another one, the serialNumber field can be used to distinguish John Doe 1 from
John Doe 2's certificate. Click here for more info.][2]
[1]: https://www.digitalocean.com/?refcode=7435ae6b8212
[2]: http://permalink.gmane.org/gmane.comp.encryption.openssl.user/9091
---
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