Traditionally, private keys on Linux-based operating systems (Ubuntu, Debian, CentOS, RedHat, etc.) are openssl generated keys with the crypto toolkit and saved into files with the.key or.pem extension. However, since specific extensions are not obligatory for simple text files on Linux systems, the private key code can be put into a file with virtually any name. At the Email Address prompt, type the e-mail address that you want to associate with the certificate, and then press Enter.; At the Challenge password prompt, press Enter.; At the Optional company name prompt, press Enter.; OpenSSL generates the private key and CSR files. If you typed the command in step 2 exactly as shown, the files are named server.key and server.csr.
Apr 12, 2020 All the commands and steps will remain the same as we used above to generate self signed certificate, the only difference would be that we will not use any encryption method while we create private key in step 1. Openssl generate private key. In this example with openssl genrsa we will not use any encryption. 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. Generate a new private key and Certificate Signing Request $ openssl req -out CSR.csr -new -newkey rsa:2048 -nodes -keyout privateKey.key Generate a certificate signing request (CSR) for an existing private key $ openssl req -out CSR.csr -key privateKey.key -new In the above you'll notice the use of the privateKey.key from the previous step.
When you are dealing with lots of different SSL Certificates, it is quite easy to forget which certificate goes with which Private Key.
Or, for example, which CSR has been generated using which Private Key.
From the Linux command line, you can easily check whether an SSL Certificate or a CSR match a Private Key using the OpenSSL utility.
To make sure that the files are compatible, you can print and compare the values of the SSL Certificate modulus, the Private Key modulus and the CSR modulus.
Cool Tip: Check the expiration date of the SSL Certificate from the Linux command line! The fastest way! Read more →
Check Compatibility
When you create a Private Key and CSR to obtain an SSL Certificate, OpenSSL generates some internal data called a modulus.OpenSSL stores the modulus in the Private Key, as well as in the CSR and therefore in the SSL Certificate itself.
If you are using either the incorrect Private Key or the SSL Certificate – you will receive an error as follows: [error] Unable to configure RSA server Private Key [error] SSL Library Error: x509 certificate routines:X509_check_private_key:key values mismatch.
Openssl Generate Private Key From Certificate Linux Pdf
So if you got the similar error – it is time to check whatever your Private Key matches the SSL Certificate by comparing their modulus.
Openssl Generate Private Key From Certificate Linux Free
[Error] … key values mismatch: Your Private Key and SSL Certificate must contain the same modulus, otherwise the web-server won’t start.
Openssl Verify Key File
Let’s print the values of the modulus of the Private Key, the SSL Certificate and the CSR with the conversion of them to md5 hashes to make the comparison more convenient. Openssl generate id_rsa key.
Openssl Test Key
Print the md5 hash of the SSL Certificate modulus:
Microsoft office 2013 home and business key generator free. Print the md5 hash of the CSR modulus:
Print the md5 hash of the Private Key modulus:
Cool Tip: Check the quality of your SSL certificate! Find out its Key length from the Linux command line! Read more →
If the md5 hashes are the same, then the files (SSL Certificate, Private Key and CSR) are compatible.