In this article you’ll find how to generate CSR (Certificate Signing Request) using OpenSSL from the Linux command line, without being prompted for values which go in the certificate’s subject field.
- Openssl Generate Key No Passphrase Key
- Openssl Pem Passphrase
- Openssl Generate Key No Passphrase Registration
I'm using openssl to sign files, it works but I would like the private key file is encrypted with a password. These are the commands I'm using, I would like to know the equivalent commands using a. Oct 06, 2019 As an example, let’s generate SSH key without a passphrase: # ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/idrsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /root/.ssh/idrsa. Jul 21, 2011 openssl - no more passphrase-less keys! So, I'm trying to set up a self-signed certificate so people can't sniff my password. To create a new Private Key without a passphrase. # openssl genrsa -out www.example.com.key 4096 To create a new password. Oct 06, 2019 As an example, let’s generate SSH key without a passphrase: # ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/idrsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /root/.ssh/idrsa.
Below you’ll find two examples of creating CSR using OpenSSL.
In the first example, i’ll show how to create both CSR and the new private key in one command.
And in the second example, you’ll find how to generate CSR from the existing key (if you already have the private key and want to keep it).
Both examples show how to create CSR using OpenSSL non-interactively (without being prompted for subject), so you can use them in any shell scripts.
Create CSR and Key Without Prompt using OpenSSL
Use the following command to create a new private key 2048 bits in size example.key and generate CSR example.csr from it:
| Option | Description |
|---|---|
| openssl req | certificate request generating utility |
| -nodes | if a private key is created it will not be encrypted |
| -newkey | creates a new certificate request and a new private key |
| rsa:2048 | generates an RSA key 2048 bits in size |
| -keyout | the filename to write the newly created private key to |
| -out | specifies the output filename |
| -subj | sets certificate subject |
Generate CSR From the Existing Key using OpenSSL
Use the following command to generate CSR example.csr from the private key example.key:
| Option | Description |
|---|---|
| openssl req | certificate request generating utility |
| -new | generates a new certificate request |
| -key | specifies the file to read the private key from |
| -out | specifies the output filename |
| -subj | sets certificate subject |
Automated Non-Interactive CSR Generation
The magic of CSR generation without being prompted for values which go in the certificate’s subject field, is in the -subj option.
| -subj arg | Replaces subject field of input request with specified data and outputs modified request. The arg must be formatted as /type0=value0/type1=value1/type2=…, characters may be escaped by (backslash), no spaces are skipped. |
The fields, required in CSR are listed below:
| Field | Meaning | Example |
|---|---|---|
| /C= | Country | GB |
| /ST= | State | London |
| /L= | Location | London |
| /O= | Organization | Global Security |
| /OU= | Organizational Unit | IT Department |
| /CN= | Common Name | example.com |
Openssl Generate Key No Passphrase Key
Openssl Pem Passphrase
You’ve created encoded file with certificate signing request.
Openssl Generate Key No Passphrase Registration
Now you can decode CSR to verify that it contains the correct information.