1. You can't generate a private key for an existing SSL certificate. First you generate the key pair (private + public), then you generate a CSR (containing your public key) that you forward to the CA (Comodo in this case) which will provide you with the certificate to install on your server.
2. Whether you are getting a certificate from a CA or generating your own self-signed certificate, the first step is to generate a key. If the certificate will be used by service daemons, such as Apache, Postfix, Dovecot, etc., a key without a passphrase is often appropriate.

• Linux Generate Private Key From Certificate Linux Code
• Advantages Of Private Key Encryption
• Linux Generate Private Key From Certificate Linux Free
• Linux Generate Private Key From Certificate Linux Pdf

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Point-to-Site connections use certificates to authenticate. This article shows you how to create a self-signed root certificate and generate client certificates using the Linux CLI and strongSwan. If you are looking for different certificate instructions, see the Powershell or MakeCert articles. For information about how to install strongSwan using the GUI instead of CLI, see the steps in the Client configuration article.

Install strongSwan

A Collaborative Project from Linux Foundation provided letsencrypt.org for free of cost, This can be used for any type of websites or in any place where you required to encrypt the communications. To create an SSL certificate first we need to generate a CSR file and submit with the certificate authority.

The following configuration was used for the steps below:

Computer	Ubuntu Server 18.04
Dependencies	strongSwan

Use the following commands to install the required strongSwan configuration:

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Use the following command to install the Azure command-line interface:

Generate and export certificates

Generate the CA certificate.

Print the CA certificate in base64 format. This is the format that is supported by Azure. You upload this certificate to Azure as part of the P2S configuration steps.

Generate the user certificate.

Generate a p12 bundle containing the user certificate. This bundle will be used in the next steps when working with the client configuration files.

Next steps

Continue with your Point-to-Site configuration to Create and install VPN client configuration files.

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With a secure shell (SSH) key pair, you can create virtual machines (VMs) in Azure that use SSH keys for authentication, eliminating the need for passwords to sign in. This article shows you how to quickly generate and use an SSH public-private key file pair for Linux VMs. You can complete these steps with the Azure Cloud Shell, a macOS or Linux host, the Windows Subsystem for Linux, and other tools that support OpenSSH.

Note

VMs created using SSH keys are by default configured with passwords disabled, which greatly increases the difficulty of brute-force guessing attacks.

For more background and examples, see Detailed steps to create SSH key pairs.

For additional ways to generate and use SSH keys on a Windows computer, see How to use SSH keys with Windows on Azure.

Supported SSH key formats

Azure currently supports SSH protocol 2 (SSH-2) RSA public-private key pairs with a minimum length of 2048 bits. Other key formats such as ED25519 and ECDSA are not supported.

Create an SSH key pair

Use the ssh-keygen command to generate SSH public and private key files. By default, these files are created in the ~/.ssh directory. You can specify a different location, and an optional password (passphrase) to access the private key file. If an SSH key pair with the same name exists in the given location, those files are overwritten.

The following command creates an SSH key pair using RSA encryption and a bit length of 4096:

If you use the Azure CLI to create your VM with the az vm create command, you can optionally generate SSH public and private key files using the --generate-ssh-keys option. The key files are stored in the ~/.ssh directory unless specified otherwise with the --ssh-dest-key-path option. The --generate-ssh-keys option will not overwrite existing key files, instead returning an error. In the following command, replace VMname and RGname with your own values:

Provide an SSH public key when deploying a VM

To create a Linux VM that uses SSH keys for authentication, specify your SSH public key when creating the VM using the Azure portal, Azure CLI, Azure Resource Manager templates, or other methods:

If you're not familiar with the format of an SSH public key, you can display your public key with the following cat command, replacing ~/.ssh/id_rsa.pub with the path and filename of your own public key file if needed:

A typical public key value looks like this example:

If you copy and paste the contents of the public key file to use in the Azure portal or a Resource Manager template, make sure you don't copy any trailing whitespace. To copy a public key in macOS, you can pipe the public key file to pbcopy. Similarly in Linux, you can pipe the public key file to programs such as xclip.

The public key that you place on your Linux VM in Azure is by default stored in ~/.ssh/id_rsa.pub, unless you specified a different location when you created the key pair. To use the Azure CLI 2.0 to create your VM with an existing public key, specify the value and optionally the location of this public key using the az vm create command with the --ssh-key-values option. In the following command, replace VMname, RGname, and keyFile with your own values:

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If you want to use multiple SSH keys with your VM, you can enter them in a space-separated list, like this --ssh-key-values sshkey-desktop.pub sshkey-laptop.pub.

SSH into your VM

With the public key deployed on your Azure VM, and the private key on your local system, SSH into your VM using the IP address or DNS name of your VM. In the following command, replace azureuser and myvm.westus.cloudapp.azure.com with the administrator user name and the fully qualified domain name (or IP address):

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If you specified a passphrase when you created your key pair, enter that passphrase when prompted during the login process. The VM is added to your ~/.ssh/known_hosts file, and you won't be asked to connect again until either the public key on your Azure VM changes or the server name is removed from ~/.ssh/known_hosts.

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If the VM is using the just-in-time access policy, you need to request access before you can connect to the VM. For more information about the just-in-time policy, see Manage virtual machine access using the just in time policy.

Next steps

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• For more information on working with SSH key pairs, see Detailed steps to create and manage SSH key pairs.

• If you have difficulties with SSH connections to Azure VMs, see Troubleshoot SSH connections to an Azure Linux VM.