Php Openssl Generate Key Pair
Click Generate to generate a public/private key pair. As the key is being generated, move the mouse around the blank area as directed. (Optional) Enter a passphrase for the private key in the Key passphrase box and reenter it in the Confirm passphrase box.
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Lets say you have a private/public key pair that you use to login to your server via SSH and you lose the public key, either it was deleted or corrupt and you don’t want to have to regenerate a new pair what options do you have? In this post I will demonstrate how to regenerate a public key from the corresponding private key that you still have.
Generate public key and store into a file
It is a simple one liner command to generate a public key from a private key, so lets say our private key is named ‘user@myserver.key’ and we want to generate the public key and name it ‘authorized_keys’. Below is the command to do this.
user@workstation:~$ssh-keygen-y-fuser@myserver.key>authorized_keys |
If you can't generate a new private key using opensslpkeynew or opensslcsrnew, your script hangs during the call of these functions and in case you specified a 'privatekeybits' parameter, ensure that you cast the variable to an int. Took me ages to notice that. May 22, 2019 It is advised to issue a new private key each time you generate a CSR. Hence, the steps below instruct on how to generate both the private key and the CSR. Openssl req -new -newkey rsa:2048 -nodes -keyout yourdomain.key -out yourdomain.csr. Make sure to replace yourdomain with the actual domain you’re generating a CSR for.
Command Breakdown:
‘ssh-keygen -y’ : tells the prorgram ssh-keygen to output a public key
‘-f user@myserver.key’: references the key file user@myserver.key to generate the public key from
‘> authorized_keys’: instead of printing the output to the console redirect the output (public key) to a file named ‘authorized_keys’
Copy public key to your server
Now we will need to take our authorized_keys file and store it on the server, if we can currently login via SSH to our server we can use rsync over ssh to securely copy the public key to the server, Although this key is displayed to anyone who attempts to login to your server it is smart to use SSH or another secure method to copy it up to the server to ensure that the key is not tampered with while it is being transmitted.
Below is an example using rsync to copy the authorized keys file to its destination on the server and removing it from your local computer.