Common OpenSSL Commands with Keys and Certificates

This will fire up OpenSSL, instruct it to generate a certificate signing request, and let it know to use a key we are going to specify – the one we just created, in fact. Note that a certificate signing request always has a file name ending in.csr.

Generate RSA private key with certificate in a single command

Generate Certificate Signing Request (CSR) from private key with passphrase

Generate RSA private key (2048 bit)

  1. For server.key, use openssl rsa in place of openssl x509. The server.key is likely your private key, and the.crt file is the returned, signed, x509 certificate. If this is for a Web server and you cannot specify loading a separate private and public key: You may need to concatenate the two files. For this use.
  2. Nov 09, 2019  Open the result file (private-key.pem) and copy text between and encluding —–BEGIN PRIVATE KEY—– and —–END CERTIFICATE—– text. Extract Certificate from PFX. Then extract the certificate file. The following command will extract the certificate from the.pfx file. You can find the certificate in file named certificate.pem. Openssl pkcs12 -in myfile.pfx-nokeys -out certificate.pem.

Generate a Certificate Signing Request (CSR)

Openssl Generate From Csr Seperate Private Key File

Generate RSA private key (2048 bit) and a Certificate Signing Request (CSR) with a single command

Convert private key to PEM format

Generate a self-signed certificate that is valid for a year with sha256 hash

View details of a RSA private key

View details of a CSR


View details of a Certificate

View details of a Certificate in DER format

Openssl Generate From Csr Separate Private Key File Online

Convert a DER file (.crt .cer .der) to PEM

Convert a PEM file to DER

Generate CSR - OpenSSL


This article provides step-by-step instructions for generating a Certificate Signing Request (CSR) in OpenSSL. This is most commonly required for web servers such as Apache HTTP Server and NGINX. If this is not the solution you are looking for, please search for your solution in the search bar above.

Switch to a working directory

Openssl Generate From Csr Separate Private Key File Pem File

GNU/Linux & Mac OS X users:
Open a terminal and browse to a folder where you would like to generate your keypair

Windows Users:
Navigate to your OpenSSL 'bin' directory and open a command prompt in the same location.

Generate a CSR & Private Key:
openssl req -out CSR.csr -new -newkey rsa:2048 -keyout privatekey.key

To generate a 4096-bit CSR you can replace the rsa:2048 syntax with rsa:4096 as shown below.
openssl req -out CSR.csr -new -newkey rsa:4096 -keyout privatekey.key

Note: You will be prompted to enter a password in order to proceed. Keep this password as you will need it to use the Certificate.

Fill out the following fields as prompted:
Note: The following characters can not be accepted: < > ~ ! @ # $ % ^ * / ( ) ?.,&

Openssl Generate Csr Config File

Country NameUS (2 Letter Code)
State or ProvinceNew Hampshire (Full State Name)
LocalityPortsmouth (Full City name)
OrganizationGMO GlobalSign Inc (Entity's Legal Name)
Organizational Unit Support (Optional, e.g. a department)
Common (Domain or Entity name)

Openssl Generate From Csr Separate Private Key Files

You should now have a Private Key (privatekey.key) which should stay on your computer, and a Certificate Signing Request (CSR.csr), which can be submitted to GlobalSign to sign your public key. Each of these files can be viewed in a plain text editor such as Notepad, TextEdit, Vi, Nano, and Notepad++.

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