How to generate a private key for the existing .crt file on Apache?
I was given a certificate but I wasn't given a key. Can I generate a key for an existing certificate?
Unfortunately, this is not possible. You cannot generate a private key out of an existing certificate. If it would be possible, you would be able to impersonate virtually any HTTPS webserver.
How should generating a certification look like
The process starts when you generate a public/private key and create CSR (Certificate Signing Request) which contains the public key, domain, and additional information. Then the CST needs to be sent to the CA (Certificate Authority) for signing. CA will send back the certificate based on the content of the CSR.
What it means for you is that you probably have the private key already. All you need to do is find it.
How to find my private key
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
To search for the private key, use the following command:
sudo find [search_start_folder] -type f -iname 'private.key'
[search_start_folder] part with the directory where you want to
start searching. You can use
/ to start from the root directory. Keep in mind
that this may take a while.
Where to keep SSL certificates and private keys on Ubuntu and Debian?
To list all available CA SSL certificates run the following lines of code:Questions
Does each subdomain need its own SSL certificate?
This depends purely on what type of certificate you have. You can have a standard single domain certificate. Aside from that, you can also get two following types of certificates.Questions
How to generate a private key for the existing .crt file on Nginx?
Unfortunately, this is not possible. You cannot generate a private key out of an existing certificate. If it would be possible, you would be able to impersonate virtually any HTTPS webserver.Questions
The usual cause is that the implementation of SSL on your server is not correct. The error is usually caused by a server-side problem which the server administrator will need to investigate.Questions
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