Steps to create RSA private key, self-signed certificate, keystore, and truststore for a client. Generate a private key. Openssl genrsa -out diagclientCA.key 2048 Create a x509 certificate. Openssl req -x509 -new -nodes -key diagclientCA.key -sha256 -days 1024 -out diagclientCA.pem Create PKCS12 keystore from private key and public certificate.

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.

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.

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1. You must update OpenSSL to generate a widely-compatible certificate' The first OpenSSL command generates a 2048-bit (recommended) RSA private key. The second command generates a Certificate Signing Request, which you could instead use to generate a CA-signed certificate. This step will ask you questions; be as accurate as you like since you.
2. The CSR (Certificate Signing Request) alone is enough to generate a valid certificate. The CSR has all of the requested details of the certificate (Subject name, location, organization, etc.) along with the public key.

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).

Generate rsa key command line. 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:

Openssl Generate Private Key From Existing Certificate

Generate CSR From the Existing Key using OpenSSL

Openssl Generate X509 Certificate From Private Key

Use the following command to generate CSR example.csr from the private key example.key:

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.

The fields, required in CSR are listed below:

Openssl Command To Generate Private Key From Certificate

You’ve created encoded file with certificate signing request.

Openssl Generate Key From Certificate Download

Now you can decode CSR to verify that it contains the correct information.